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Fuses & Overcurrent Protection

Littelfuse offers proven, reliable overcurrent solutions. Our global reputation is built from years of engineering and design expertise. Our fuses and devices safeguard sensitive electronic systems. From automotive to industrial applications, our products meet global standards, protecting equipment worldwide.

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    Battery Protector

    Battery Protector

    ITV Three-Terminal Fuses

    ITV three-terminal fuses provide overcurrent and overvoltage protection to portable rechargeable Li-ion batteries. An embedded heater ensures the fuse blows when signals from integrated circuits or field effect transistors (FETs) indicate current or voltage surges occurred. By acting as surge suppressors, ITV three-terminal fuses prevent overcharging that can irreparably damage rechargeable batteries. The small size of the fuses makes them good choices for battery protection in power tools, laptops, and robotic vacuum cleaners.
    • Rated at 32 V
    • Available with ampere ratings of 12 A, 15 A, and 22 A
    • Fast-acting performance
    • Meet UL and TUV standards
    • Certified halogen-free and RoHS compliant
    • Specially designed for use with portable rechargeable Li-ion batteries
    • Provide overcurrent and overvoltage protection
    • Highly resistant to heat and thermal shock damage
    • Low-profile design save space in the battery compartment

    Circuit Breaker Accessories

    Circuit Breaker Accessories

    Circuit Breaker Accessories

    Circuit breaker accessories available from Littelfuse include spring steel mounting brackets, solid brass bus bars, and solid copper bus bars. We offer these brackets and bus bars in several different sizes and configurations. Each securely holds more than one box-style circuit breaker, and all fit easily under the hood of a commercial vehicle.
    • Order glass fuse holders, bus bars for box-style circuit breakers, and dc power distribution modules that accommodate blade-style circuit breakers.
    • Commercial Vehicle Circuit Breaker Bus Bars, Brackets & PDMs

    Circuit Breakers

    ATO

    ATO

    Our ATO(R); automotive circuit breakers are designed to mount in ATO (R); fuse blocks and panels. These blade-style circuit breakers meet OEM requirements and conform to SAE J553 or J553C standards. Our portfolio of ATO® circuit breakers includes both Type 1 automatic reset circuit breakers and Type 2 modified reset circuit breakers that are primarily used as wiring harness protectors in 12 V dc automotive systems.
    • Circuit breakers designed to meet OEM requirements
    • Options with snap-off terminals work identically to OEM circuit breakers but offer versatility
    Box

    Box

    Automotive circuit breakers are a cost-effective way to achieve repeatable, reliable circuit protection. We offer different styles of circuit breakers for automotive applications, including 12 V and 24 V box-style circuit breakers for underhood or chassis-mounted circuit secondary protection and a Hi-Amp series of waterproof, high-current DC circuit breakers for auxiliary and accessory circuits in trucks, buses, and marine applications. Our flexible automotive circuit breaker solutions give you what you need to protect wiring, electrical equipment, and vehicle subsystems.
    • Box-style circuit breakers are available in multiple current ratings, waterproof configurations, and mounting styles
    • Hi-Amp series circuit breakers comply with SAE J1117 and J1625 standards for ignition protection

    Glass

    Littelfuse offers a wide variety of automotive circuit breakers and fuses that are designed for direct replacement in many OEM applications. Our glass fuse circuit breakers are made for glass fuses without physical alteration in the system. These glass-fuse-type circuit breaker options are used primarily as wiring harness protectors in 12 V dc automotive systems.
    • Available with current ratings from 10 A to 40 A
    • SAE Type II non-cycling circuit breakers for glass fuses
    • All glass circuit breaker options conform to SAE J553C standards
    MAXI Style

    MAXI Style

    Designed to fit a MAXI® blade fuse block or panel, our MAXI® circuit breaker options can be used as direct factory replacements for many domestic OEM applications. Available in SAE Type I cycling circuit breaker (automatic reset) or Type II non-cycling circuit breaker (modified reset) configurations, MAXI® circuit breakers are used primarily as wiring harness protectors in 12 V automotive systems. Browse below to find 20 A MAXI® circuit breakers for cooling fans, 30 A MAXI® circuit breakers for headlamps and wipers, 40 A MAXI® circuit breakers for heavy-truck applications, and more.
    • Replacement MAXI® circuit breakers meet OEM requirements
    • All options conform to SAE J553C standards

    Miniature Circuit Breakers

    Miniature Circuit Breakers offer dependable protection for a wide range of electrical applications. They come in configurations of 1, 2, and 3 poles, with amperage options from 10 to 60, making them suitable for both residential and commercial settings. Designed with durability and safety in mind, these breakers ensure your electrical systems are safeguarded against overloads and short circuits while maintaining top performance.

    MINI Style

    What is a MINI® circuit breaker? Designed to fit in a MINI® blade fuse block or panel, a MINI® circuit breaker is used primarily as a wiring harness protector in 12 V automotive systems. Look to our MIB series for non-cycling (modified reset) automotive circuit breakers or to our MINI® Blade Circuit Breakers series for cycling (auto reset) and non-cycling circuit breakers with plated steel housings. Our portfolio also includes cycling and non-cycling circuit breakers with plastic housings. Browse below to find MINI® circuit breakers for wiper motors, headlamps, power windows, power seats, and more.
    • Available with plated steel or plastic housing
    • 5 A to 30 A current ratings

    Thermal

    Metal hybrid protection (MHP) devices combine resettable fuses with bimetallic thermal cutoff devices to provide overcurrent and overtemperature protection to rechargeable batteries. MHP devices, which are also called battery mini breakers, protect Li-ion and lithium polymer batteries for notebook PCs and power tools. They are also small enough to use with prismatic cells for mobile phones. The MHP devices made by Littelfuse rely on our innovative PolySwitch® polymer positive temperature coefficient (PPTC) technology to ensure long-lived resettable fuse performance.
    Mini Breaker (MHP)
    Formally known as metal hybrid protection (MHP) devices, mini breakers provide overcurrent and overtemperature protection to rechargeable batteries. The compact devices combine resettable fuses with bimetallic thermal cutoffs to protect Li-ion and lithium polymer batteries for notebook PCs and power tools. Our MHPs rely on innovative polymer positive temperature coefficient (PPTC) technology to ensure long-lived resettable fuse performance. These mini breakers are also small enough to use with prismatic cells for mobile phones.
    • Available with multiple activation temperature ratings, from 72 ℃ to 90 ℃
    • Available with ampere ratings from 6 A to 18 A
    • Minimum reset temperatures of 40 ℃
    • Reset temperature change requirements of 7 ℃ or 10 ℃
    • Low maximum resistance ratings of 5 mΩ
    • Meet IEC 607301 and 60730-2-9 standards
    • UL Recognized
    • PPTC fuses act as heaters to help keep bimetallic thermal cutoff devices latched until faults are removed
    • Higher current ratings than typical thermal cutoff devices
    • Small sizes (e.g., 5.8×3.8×1.5 mm) allow for ultra-thin battery pack designs

    eFuse

    eFuse

    Technically an integrated circuit, an eFuse provides overcurrent, overvoltage, overtemperature, and inrush current protection to circuits and electronic components. An eFuse also has current-limiting characteristics and can transmit diagnostic data to automatic switches and users in real time. Thermal and overvoltage shutdown devices built into eFuses prevent downstream damage from faults. Designed to mount on the surface of printed circuit boards, eFuses can be found in network servers, data storage devices, docking stations, tablets, and computer cooling fan drives.
    • Available with a wide range of input voltages, from 2.7 V dc to 24 V dc
    • Maximum input and output voltages of 30 V dc
    • Available with 3 pins, 8 pins, 10 pins, or 16 pins
    • Certified lead-free and RoHS compliant
    • Low-profile designs (e.g., 2.9×2.9×0.7 mm) save space on PCBs
    • Internal soft start switch’s low on resistance minimizes power loss during start up and inrushes of current
    • Externally programmable current-limiting characteristics, overvoltage thresholds, and soft-start times
    • Optional fault indicators

    Fuse Holders, Fuse Blocks & Accessories

    Fuse Accessories

    Whether you need a Class J fuse removal tool, a fuse adapter, a cabinet to safely store and logically organize replacement fuses, Littelfuse delivers. We make extensive lines of fuse pullers with handles designed to ensure ease of use, fuse reduces to prevent overfusing in industrial power applications, and specialty fuse accessories. You can also rely on us to supply high-performance fuse caps, fuse covers, fuse clips, fuse disconnect switches for telecommunication equipment, and fuse jumpers for customizing circuits and upgrading overcurrent protection.

    Fuse caps, covers, bodies, and terminals combine to form assemblies that fit into fuse holders. The caps and covers protect fuses and people, and several of those components are designed to make fuse removal and replacement simpler. Each type and size of fuse requires caps and covers that fit their unique dimensions. For this reason, Littelfuse makes dozens of caps and covers for a range of different cartridge, blade, and inline fuses.

    Bodies, Caps, Covers & Terminals

    Fuse caps, covers, bodies, and terminals combine to form assemblies that fit into fuse holders. The caps and covers protect fuses and people, and several of those components are designed to make fuse removal and replacement simpler. Each type and size of fuse requires caps and covers that fit their unique dimensions. For this reason, Littelfuse makes dozens of caps and covers for a range of different cartridge, blade, and inline fuses.

    Fuse Clips

    Fuse Clips

    Fuse clips enable easy installation and replacement of overcurrent protection devices. Generally resembling U clamps, fuse clips also keep fuses secure in moving vehicles and machines that experience high vibrations. Littelfuse produces clips for fuses of all designs and sizes. Places you will find our fuse clips include electric motors, battery control modules, computers, electronic locks, household appliances, HVAC-R units, lamps and lighting arrays, power plants, and telecom equipment. If you do not find an off-the-shelf clip that perfectly meets your needs, contact a Littelfuse expert to custom design a clip.

    Fuse Pullers & Testers

    The Littelfuse ergonomically-designed fuse pullers and POWR-JAW clip clamps offer greater ease in removing fuses because they feature a more comfortable and natural grip. These specially-designed fuse pullers increase safety and performance by improving upon unnecessary heat from poor contact, nuisance opening, and premature aging of surrounding components. The POWR-JAW clips are designed to improve contact between the fuse and the clip and come in a variety of voltage and ampere ratings. These products are offered in several different sizes to accommodate fuse size variations.

    UL Class Fuse Reducers

    Littelfuse POWR-GARD UL Class fuse reducers allow lower-rated fuses to fit higher-rated fuse blocks, fuse holders, and fused disconnect switches to prevent overfusing. With these fuse reducers, smaller size fuses can fit into existing fuse clips. The LRUH, LRUJ, and LRUR series fuse reducers are intended to be used with UL Class H, J, and R fuses, respectively. These products are designed and manufactured with a variety of features and benefits including easy installation, silver-brazed joints for maximum strength, UL listed, CSA certified, and help to reduce inventory requirements.

    Fuse Blocks

    Fuse blocks that serve as holders for specialized fuses simplify installation, prevent shocks, and align terminals with contacts. Littelfuse makes several fuse blocks specifically for cartridge, 3AB/AG, NANO2®, UL Class CC, UL Class G, and 5×20 mm fuses. Each block can be configured to mount on printed circuit boards or with quick connect terminals for use in fuse boxes. Some come with fuses already inserted. Applications include battery chargers, consumer electronics, control panels, dc motors, household appliances, power lines, and uninterruptible power supplies. Contact us to discuss custom-designing a solution.

    Automotive Fuse Blocks

    Look no further for compact, durable, and adaptable automotive fuse blocks. Littelfuse produces automotive fuse boxes for cars and commercial vehicles that accommodate ATO®, MAXI®, MEGA®, MIDI®, and MINI® fuses. The blocks come with protective covers, and several feature blown fuse indicator lights. Our CF8 fuse holder and power distribution block is specifically designed to secure and coordinate the performance of high-current bolt-down fuses used in large trucks. We also supply a glass fuse holder to facilitate the maintenance and restoration of classic cars.
    • Blocks specifically designed for all commonly used automotive fuses
    • Accommodate 32 V, 42 V, and 58 V fuses
    • Hold 5–24 fuses of various sizes and ratings
    • Insulated covers protect fuses from dust and moisture
    • Several blocks available in waterproof designs
    • Thermoplastic bodies withstand harsh conditions
    • Bolt-down designs ensure secure mounting
    • Simplify circuit design and maintenance by centralizing and coordinating overcurrent protection
    • LED indicators on many blocks make it easier to identify blown fuses
    • Blocks can be wired in parallel or serially to work in tandem
    • Small footprints facilitate panel mounting or placement in several different locations under the hood
    Industrial Fuse Blocks

    Industrial Fuse Blocks

    Littelfuse POWR-GARD industrial fuse blocks provide superior protection for wiring in electrical circuits and increase the life of electrical equipment. Littelfuse also offers a variety of fuse block covers to protect personnel from accidentally coming into contact with energized parts. Littelfuse industrial fuse blocks are designed to hold a variety of fuses including Class CC/CD, G, H/K5, J, R, T, and Midget (10×38) sizes. Features include indication, snap-to-release, DIN-rail mounting, space-saving design, universal mounting holes and touch-safe covers.

    PCB Mount - Fuse Blocks

    PCB Mount – Fuse Blocks

    Fuse blocks for overcurrent protection devices that mount on printed circuit boards perform many functions. The blocks secure fuses, ensure contact with terminals despite movement and vibrations, and prevent contamination and corrosion. They also limit electromagnetic interference and simplify installation and replacement. To deliver these benefits, Littelfuse produces fuse blocks for NANO2®, 2AG, 3AG, and 5×20 mm PCB mount fuses.

    Fuse Holders

    Fuse holders protect overcurrent protection devices from damage and displacement. Using holders also makes it easier to install fuses. Each fuse requires a holder designed for its size, shape, and performance demands. For that reason, Littelfuse produces holders for inline fuses, MICRO® fuses, and cartridge fuses categorized as 3AB/3AG, 5×15 mm, 2AG, 5×20 mm, PICO® II, TE5, and TR5 fuses. Features for individual fuse holders include being mountable on printed circuit boards, including indicators to show when fuses blow, and being waterproof. Consult our Fuse Holder Selection Chart when choosing your best option.

    PCB Mount – Fuse Holders

    Fuse holders for overcurrent protection devices that mount on printed circuit boards perform many functions. The holders secure fuses, ensure contact with terminals despite movement and vibrations, and prevent contamination and corrosion. They also limit electromagnetic interference and simplify installation and replacement. To deliver these benefits, Littelfuse produces fuse holders for MINI®, TE5, TR5®, LT-5, 5×20 mm, and 6.3×32 PCB mount fuses.

    Panel-Mounted Fuse Holder

    Panel mount fuse holders secure overcurrent protection devices and protect people from electrical shock injuries. Littelfuse produces panel mount fuse holders for MICRO®, PICO®, Class CC, 2AG, 3AG, TE5, TR5, and 5×20 mm fuses. Designs vary: Some fuse holders feature LED blown fuse indicator lights, other holders have flip caps to facilitate fuse replacement, and some holders are waterproof. Check our selection guide to identify the fuse holder that best meets your needs.

    In-line Fuse Holders

    In-line fuse holders install along wiring harnesses to put overcurrent protection in places where fuse blocks will not fit or where routing cables to a junction box would prove impractical. Littelfuse makes in-line fuse holders that fit most types of fuses used in automotive, industrial, lighting, telecommunications, and power generation and transmission applications. Off-the-shelf options include waterproof and indicating holders. We can also partner with you to design a customized in-line holder.
    • Rated for use in 12 V to 58 V systems
    • Some versions can accommodate fuses up to 60 A
    • Good UL 94 flammability ratings
    • Versions specifically engineered to hold blade, cartridge, cylindrical, glass, and torpedo fuses
    • Waterproof seals
    • Optional covers available

    Electrical In-Line & Panel Mount Fuse Holders

    Littelfuse electrical in-line and panel-mount fuse holders are designed for maximum protection in high humidity and corrosive environments. These products are designed to be touch-safe and flexible for use in a variety of applications, including street and parking lot lighting, sports stadium lighting, outdoor illuminated signs, alley lighting, boat electrical circuits, tractors/yard equipment, traffic signals, and fluorescent fixtures. These products are designed with many features including a watertight O-ring seal, insulating boots for extremely harsh conditions, and 1- and 2-pole configurations.

    Dead Front Fuse Holders

    Littelfuse POWR-SAFE dead front fuse holders offer maximum safety protection to personnel when installing and removing fuses. These fuse holders feature touch-safe protection and are offered in indicating and non-indicating options. Littelfuse also offers a bus bar series for safe distribution of power to multiple fuse holders. POWR-SAFE dead front fuse holders are designed to hold Class CC, Midget (10 x 38 mm), Class J, and 10 x 85 mm fuses.

    Box Cover Units

    Provide overcurrent protection to small electric motors and telecommunications systems by installing box cover units. Each unit made by Littelfuse accommodates a single type S plug fuse or an Edison-base plug fuse with an adapter. A hinged cover protects the fuse, and an on–off switch permits a user to engage or disable the fuse. An indicator light shows the status of the fuse. Made of lightweight aluminum, box cover units can attach to motor housings, install in control panels, or mount on walls.

    Bolt-Down Single Fuse Holders

    For high-current applications, such as battery and alternator connections and starter fusing, electrical requirements dictate the use of larger bolt-down fuses like MEGA®, MIDI®, and ZCASE®. Littelfuse offers a wide range of automotive fuse holder types, including battery-mounted, stud-mounted, and bolt-down holders. Our single-fuse holders let you mount a fuse in a convenient location and shield it against harsh conditions. Many styles are connectable for protecting multiple fuses, and you’ll find sealed options as well.
    • MEGA® fuse holders, MIDI® fuse holders, ZCASE® fuse holders, and strip fuse holders in a variety of mounting styles
    • Options include battery-mounted fuse holders, stud-mounted fuse holders, and bolt-down fuse holders
    • Many styles are stackable or connectable for protecting multiple fuses
    • Various ratings for Ingress Protection (IP) are available for matching your application’s requirements for protection against dust and water
    • Lets you mount a fuse in a convenient or easily accessible location
    • Shields the critical circuit protection elements in an application against environmental conditions
    Telecom Fuse Holders

    Telecom Fuse Holders

    Fuse holders for the Class G, plug, and other fuses commonly used in telecommunications equipment simplify installation and replacement. Using telecom fuse holders also protects overcurrent protection devices from dust and moisture, prevent shock injuries, and ensure fuses remain securely in place. Littelfuse makes several types of telecom fuse holders, including ones that pair with disconnect switches. Check our selection guide to identify the fuse holder that best meets your needs.

    Fuses

    Explore our full range of fuse types and sizes. As a leading manufacturer of electrical components, we offer a broad selection of fuse types, such as electrical and industrial fuses. Our industrial fuses are designed to deliver reliable overcurrent protection across a wide range of applications. From power and automotive fuses to axial, cartridge, surface-mount, specialty, and medium-voltage options, our solutions ensure safe and efficient current regulation for virtually any system or device.

    AEC-Q200 Qualified

    AEC-Q200 Qualified

    AEC-Q200 Qualified

    Our AEC-Q200 qualified automotive fuses are engineered to meet the rigorous demands of AEC automotive standards, delivering reliable performance under extreme temperatures, high humidity, and intense vibration. Littelfuse offers an extensive selection of cartridge, bolt-down, and surface-mount fuses that provide fast-acting or very fast-acting overcurrent protection. With high current, voltage, and interrupting ratings, these fuses are ideal for safeguarding circuits, batteries, and onboard chargers in electric vehicles.

    Automotive Aftermarket Products - Fuses

    Littelfuse offers a wide range of car fuse replacement options and high-quality automotive aftermarket products designed to match OEM performance standards. Our selection includes replacement blade, bolt-down, and cartridge fuses under trusted brands like ATO/ATOF®, MAXI®, MEGA®, MIDI®, and MINI®. We also supply fusible links and 80 V fuses for forklifts, torpedo and glass fuses for classic vehicles, and UL Class T fuses for electric vehicles.

    Blade Fuses/Shunts - Automotive Aftermarket

    Blade Fuses/Shunts – Automotive Aftermarket

    Choose aftermarket blade fuses and shunts made by Littelfuse when repairing and upgrading electrical systems in passenger and commercial vehicles. Engineered to the same exacting specifications as our OEM ATO/ATOF®, MAXI®, LP MINI, MICRO®, MINI® fuses, these overcurrent protection devices work in gasoline-powered, diesel, and electric vehicles.
    • Current ratings from 2 A to 100 A
    • Interrupting ratings of 1 kA at 32 V dc
    • PA66 housings with UL94 flammability ratings of V-2 or HB
    • Lead-free and RoHS compliant
    • Color coding indicates ampere rating
    • High-contrast ampere stamps aid identification
    • See-through housings make it easier to see when fuses blow
    • Carded for retail display and sale
    Bolt-Down Fuses - Automotive Aftermarket

    Bolt-Down Fuses – Automotive Aftermarket

    Choose aftermarket bolt-down fuses made by Littelfuse when repairing and upgrading high-current electrical systems in passenger and commercial vehicles. Engineered to the same exacting specifications as our OEM EV1K, MEGA®, and MIDI® fuses, these overcurrent protection devices work in gasoline-powered, diesel, and electric vehicles.

    Cartridge Fuses – Automotive Aftermarket

    Choose aftermarket cartridge fuses made by Littelfuse when repairing and upgrading electrical systems in passenger and commercial vehicles. Engineered to the same exacting specifications as our full-size JCASE®, compact LP JCASE, and MCASE® fuses, these overcurrent protection devices work in gasoline-powered, diesel, and electric vehicles.

    Glass Fuses

    Glass Fuses

    Find the unique glass fuse your application requires. Primarily used in antique cars and trucks, glass fuses fill specific needs for overcurrent protection in ways that other types of fuses cannot. Littelfuse produces a wide array glass fuses for aftermarket retails sales. Our glass fuses are rated at 32 V dc or 50 V dc, and they have ampere ratings ranging from 125 mA to 50 A. We provide these products in several lengths and diameters.

    Indicator Fuses

    Take the guesswork out of identifying blown automotive blade fuses. Install aftermarket ATO®, MAXI®, and MINI® indicator fuses when repairing or upgrading electrical systems in vehicles. Equipped with LEDs that switch on when their elements burn out, these fuses exactly match the performance and specifications of the ATO, MAXI, and MINI fuses Littelfuse sells for OEM use.
    • Current ratings from 3 A to 100 A
    • Interrupting ratings of 1 kA at 32 V dc
    • PA66 housings with UL94 flammability ratings of V-2
    • Lead-free and RoHS compliant
    • Color coding indicates ampere rating
    • High-contrast ampere stamps aid identification
    • See-through housings make it easier to see when fuses blow
    • Carded for retail display and sale
    Kits Assortments

    Kits Assortments

    Purchasing assortment packs of aftermarket automotive fuses ensures you have the replacement fuses you need on hand just when you need them. Littelfuse produces mixed packs of ATO®, ATO SmartGlow®, JCASE®, MINI®, and MINI SmartGlow® fuses for general vehicle maintenance. We also offer replacement fusible link for Honda vehicles and assortment packs of ceramic and glass fuses for older cars and trucks. Keep all those parts organized and protected with one of our storage cases or modular rack systems.

    PAL Fuses - Automotive Aftermarket

    PAL Fuses – Automotive Aftermarket

    Like the OEM overcurrent protection device whose performance and specifications they match precisely, aftermarket PAL fuses principally protect circuits in Japanese automobiles. The cartridge fuses are rated at 32 V dc and come in housing that either plug into receptacles or have bolt-down connectors. The housings are color coded to indicate the ampere ratings of the fuses.
    • Rated at 32 V dc
    • Available with ampere ratings from 20 A to 140 A
    • Operate at temperatures ranging from –40 ℃ to +125 ℃
    • Comply with JASO 0612
    • RoHS compliant
    • Color coding indicates ampere rating
    • Transparent covers make it easier to see when fuses blow
    • Can plug into fuse boxes, be bolted in place, or both

    Specialty Products – Fuses

    Specialty automotive overcurrent protection devices from Littelfuse include shunts, diodes, and resistors. Our shunts are bladed devices that allow vehicle makers to protect circuits and measure current along wires. The shunts can work in tandem with fuses and overvoltage protection devices. Learn more about our automotive diodes and resistors.
    • Ampere rating of 20 A
    • Maximum continuous current loads of 35 A
    • Operate in temperatures ranging from –40 ℃ to +125 ℃ with terminals reaching 130 ℃ at contact points
    • Tin-plated brass terminals
    • Thermoplastic bodies with UL-94 flammability ratings of V-0
    • UL-listed
    • Certified lead-free and RoHS-compliant
    • Durable thermoplastic housings
    • Easy to install and replace

    Automotive - Fuses

    Explore our automotive fuses for passenger and commercial vehicles. Littelfuse offers the industry’s most extensive selection of automotive fuses, providing reliable protection against overcurrent, short circuits, and overtemperature conditions. Our portfolio includes OEM and aftermarket solutions such as blade fuses, cable, cartridge fuses, surface-mount, high-current, and high-voltage fuses. We also have resettable fuses, thermal protection devices, and fuse accessories to meet the demands of modern automotive applications.

    Automotive Cartridge Fuses

    Automotive Cartridge Fuses

    MCASE+® and JCASE® cartridge fuses provide time-delayed overcurrent protection to circuits in commercial and passenger vehicles. Littelfuse also sells these automotive cartridge fuses for aftermarket replacements, and a shunt version of the JCASE is available. You can order LP JCASE fuses when low-profile overcurrent protection devices will fit better in vehicles. The smaller, lighter fuses perform equivalently to their full-size JCASE counterparts.
    • Rated at 32 V dc
    • Available with ampere ratings from 15 A to 60 A
    • Interrupting rating of 1 kA at 32 V dc
    • Operate in a temperature range of –40 ℃ to +125 ℃
    • RoHS compliant
    • Color coding shows the amperage rating for each fuse
    • High-contrast amperage stamps on the top of housings aid identification
    • Semitransparent covers make it easier to see when fuses blow
    • Light weight
    • Easy to install
    Cable Fuses

    Cable Fuses

    Cable and inline fuses provide overcurrent protection along wiring harnesses in passenger and commercial vehicles. The CablePRO® and BF Inline fuses Littelfuse makes employ our patented SLO-BLO® technology to ensure reliable time-delayed performance. Please note that all the fuses in these product portfolios require insulating tubes that we can apply before delivery. We also sell our CablePRO fuse with cables attached.
    • Rated at 32 V dc
    • Available with ampere ratings from 60 A to 300 A
    • Certified lead-free and RoHS compliant
    • Ampere ratings increase as the diameter of cables grows
    • Break overloaded circuits along the wire to protect equipment
    • Crimped terminals ensure secure connections with cables

    High-Voltage Fuses

    Automotive high-voltage fuses protect circuits, batteries, and battery chargers in EVs and hybrid vehicles. Littelfuse makes these overcurrent protection devices in several configurations to allow as many applications as possible, including in EV charging stations. Each of our high-voltage automotive fuses employs diffusion pill technology to ensure reliable time-delayed performance.
    • Rated at 500 V dc
    • Available with ampere ratings from 10 A to 50 A
    • Interrupting rating of 20 kA at 500 V dc
    • Operate in temperatures ranging from –40 ℃ to +125 ℃
    • Refer to ISO 8820-8 and JASO D622
    • Available in blade, bolt-down, cartridge, and surface mount configurations to allow maximum flexibility in circuit design
    • Color-coded bands indicate ampere ratings and aid identification
    • Very low resistance
    • Ceramic bodies ensures durability
    PAL Fuses

    PAL Fuses

    Originally developed as cartridge fuses to provide overcurrent protection to starters and alternators in passenger vehicles produced in Japan, PAL fuses now come in a range of packages and appear in all makes of gas and diesel vehicles. Choose among PAL fuses that snap onto posts, plug into receptacles, or bolt onto equipment.
    • Rated at 32 V dc
    • Available with ampere ratings from 20 A to 140 A
    • Comply with JASO 0612
    • RoHS compliant
    • Color coding of housings indicates ampere rating
    • Available in blade, plug-in, and bolt-down configurations
    • Transparent covers make it easier to see when fuses blow

    SMD Autofuses

    SMD autofuses perform the same overcurrent protection functions as automotive blade fuses. The difference for SMD autofuses is their configuration. Compact and optimized to mount on the surface of printed circuit boards, SMD autofuses deliver weight savings without compromising circuit protection.
    • Rated at 18 V dc
    • Available with ampere ratings from 5 A to 30 A
    • Interrupting rating of 1 kA at 18 V dc
    • Tin-plated zinc alloy terminals
    • Liquid crystal polymer housings with UL 94 flammability ratings of HB
    • Operate in temperatures ranging for –40 ℃ to +105 ℃
    • Net weight of 0.27 g ±15 % per fuse
    • RoHS compliant
    • Shunt version available
    • High-contrast ampere stamps on housings aid identification
    • Low profile saves board space
    • Optimized for reflow soldering
    CF8

    Bolt-Down Fuses-CF8

    Fast-acting CF 58V automotive fuses serve as battery terminal fuses. Each installs on a pole in a bolt-down fuse holder and power distribution block. Buy CF8 799 Series fuse holders separately.
    • Available with ampere ratings of 50 A to 300 A
    • Interrupting ratings of 2 kA at 58 V dc
    • 50 A to 100 A fuses operate at up to 105 °C; 125 A to 300 A fuses operate at up to 125 °C
    • Tin-plated zinc alloy terminals
    • Transparent PES covers
    • Comply with ISO 8820-6 and DIN 72581-5
    • UL Recognized in Canada and the United States as UL 248 Special Purpose Fuses (File e211637)
    • Certified lead-free and RoHS compliant
    • Transparent covers make it easier to see when fuses blow
    • Fuses install like insulating nuts

    Bolt-Down Fuses-MEGA

    Rated for use in automotive electrical systems operating at up to 120 V, MEGA bolt-down fuses provide ideal overcurrent and short circuit protection solutions for batteries, alternators, and heavy gauge wire harnesses that experience large inrushes of current. Littelfuse MEGA fuses employ diffusion pill technology to provide predictable time-delayed performance, and the fuses can be used in EVs as well as gas, diesel, and hybrid vehicles.
    • Rated at 32 V dc, 70 V dc, and 120 V dc
    • Available with ampere ratings from 60 A to 650 A
    • Operate in temperatures ranging from –40 ℃ to +125 ℃
    • Copper or copper alloy terminals with tin or silver plating
    • RoHS compliant
    • Available with two, one, or no mounting holes
    • High-contrast, color-coded ampere rating stamps on housings aid identification

    Bolt-Down Fuses-MIDI

    MIDI® automotive bolt-down fuses employ diffusion pill technology to provide predictable time-delayed overcurrent protection. Typical applications for these high-current fuses include protecting wires for fans, heaters, batteries, and starters that experience large inrushes of current. Note, however, that MIDI fuses with ampere ratings higher than 150 A should only be used to protect against short circuits.
    • Rated at 32 V dc and 70 V dc
    • Available with ampere ratings from 30 A to 200 A
    • Operate in temperatures ranging from –40 ℃ to +125 ℃
    • Tin-plated copper terminals
    • UL Recognized as Special Purpose Fuses per UL 248-1 (File E71611)
    • Certified lead-free and RoHS compliant
    • Available with two, one, or no mounting holes
    • High-contrast, color-coded ampere rating stamps on housings aid identification
    ZCase

    Bolt-Down Fuses-MIDI

    Compact ZCASE® bolt down automotive fuses provide time-delayed overcurrent protection and short circuit protection in passenger and commercial vehicles. Several of the high-current fuses in this Littelfuse product portfolio can be used in EVs, hybrid vehicles, and material handling equipment. Typical applications for ZCASE fuses include protecting starters and alternators from large inrushes of current. We also offer ZCASE fuses in sealed packages so they can be installed on battery terminals without becoming damaged by battery acid or fumes.
    • Rated at 32 V dc and 80 V dc
    • Available with ampere ratings from 40 A to 600 A
    • Shunt versions available
    • Operate in temperatures ranging from –40 ℃ to +125 ℃ with terminals reaching 130 ℃ at contact points
    • Tin-plated copper terminals and ceramic insulating tubes
    • PPA-GF33HS housings with UL 94 flammability ratings of HB
    • RoHS compliant
    • One-bolt connection
    • Can mount on battery posts, starters, or bus bars
    • High-contrast ampere rating stamps aid identification
    ATOF

    Blade Fuses/Shunt-ATOF

    ATOF® automotive blade fuses were developed to take the place of obsolete ATO Series 257 fuses. Automakers consider ATOF fuses standard equipment for protecting low-voltage circuits.
    • Fast-acting
    • Available with ratings of 1 A to 40 A
    • Interrupting rating of 1 kA at 32 V dc
    • Silver- or tin-plated terminals
    • Operate at up to 125 ℃
    • Silver-plated terminals can reach 150 ℃ at contact
    • Net weight 1.4 g ±5 % per fuse
    • UL 94 flammability rating of V-2
    • RoHS compliant and certified lead-free
    • Color coding indicates ampere rating
    • See-through housing makes it easier to see when fuse blows
    • Checkpoints on top make it possible to measure resistance without removing the fuse
    • High-contrast ampere stamps aid identification

    Blade Fuses/Shunt-MAXI

    Use MAXI® automotive blade fuses to provide time-delayed overcurrent protection in passenger and commercial vehicles. The fuses employ Littelfuse’s patented SLO-BLO® technology to perform reliably and consistently.
    • Rated at 32 V dc and 58 V dc
    • Available with ampere ratings from 20 A to 80 A
    • Operate at up to 125 ℃ with contact points on silver-plated terminals reaching as high as 150 ℃
    • Tin- and silver-plated zinc alloy terminals
    • Certified lead-free and RoHS compliant
    • Color coding indicates ampere rating
    • See-through housings make it easier to see when fuses blow
    • High-contrast ampere rating stamps aid identification
    MICRO

    Blade Fuses/Shunt-MICRO

    MICRO2 TM and MICRO3 TM automotive blade fuses and shunts boast subminiature design and high performance. Weighing less than a gram per unit, these overcurrent protection devices and shunts withstand harsh environments while helping vehicle makers realize weight and materials savings without sacrificing circuit protection.
    • Rated at 32 V dc
    • Fuses available with ampere ratings from 3 A to 30 A
    • Shunts have maximum continuous load ratings of 15 A or 20 A
    • Operate at up to 125 ℃ with contact points on silver-plated terminals reaching as high as 150 ℃
    • Fuses have tin- or silver-plated zinc alloy terminals
    • Shunts have silver-plated zinc alloy terminals
    • RoHS compliant
    • Color coding indicates ampere rating
    • See-through housings make it easier to see when fuses blow
    • High-contrast ampere rating stamps aid identification
    • Checkpoints on top make it possible to measure resistance without removing the fuse

    Blade Fuses/Shunt-MINI®

    MINI automotive blade fuses and shunts weigh less than 0.6 g per unit. Their miniature design offers passenger and commercial vehicle makers significant weight and material savings while also delivering dependable fast-acting overcurrent protection in harsh environments. Littelfuse also makes a series of low-profile MINI fuses for use in locations with little space for bladed circuit protection devices.
    • Rated at 32 V dc and 58 V dc
    • Fuses available with ampere ratings from 2 A to 30 A
    • Shunts have maximum continuous load ratings of 20 A
    • Operate at up to 125 ℃ with contact points on terminals reaching as high as 150 ℃
    • Fuses have tin- or silver-plated zinc alloy terminals
    • Shunts have silver-plated zinc alloy terminals
    • Fuses are UL Listed and UL Recognized
    • Color coding indicates ampere rating
    • See-through housings make it easier to see when fuses blow
    • High-contrast ampere rating stamps aid identification
    • Checkpoints on top make it possible to measure resistance without removing the fuse
    • Blades for low-profile MINI fuses fit into the same receptacles as larger MINI fuses

    Specialty Products

    Specialty overcurrent protection power distribution solutions Littelfuse provides for automotive applications include torpedo fuses and battery power feed kits. We make torpedo fuses with thermoplastic and ceramic bodies and in 6×25 mm packages. Each version is color coded to indicate a fuse’s ampere rating. Our battery power feed kits allow users to add circuits to a vehicle’s battery by attaching a connector to a terminal.

    Axial Radial Thru Hole Fuses

    Littelfuse axial radial fuses and thru-hole fuse solutions are a comprehensive selection of axial radial fuses and axial radial thru-hole fuses designed for reliable overcurrent protection in compact circuit designs. These fuses are ideal for through-hole PCB mounting, providing consistent performance in consumer electronics, industrial controls, and automotive applications. Our axial and radial fuse options support a range of current and voltage ratings to meet diverse safety and design requirements.

    2AG 5x15mm Fuses – Axial Radial Thru Hole Fuses

    Glass-bodied 2AG 5×15 mm cartridge fuses provide overcurrent protection to ballast for fluorescent lights, integrated circuits for household appliances, and telecommunications equipment. The subminiature telecom fuses can be ordered with indicators that show when they blow.
    • Rated from 125 V ac to 350 V ac
    • Available with a very wide range of resistance ratings (e.g., 31.7 µΩ, 3.9 Ω)
    • Meet UL and IEC standards
    • Certified lead-free and RoHS compliant
    • Perform identically to 3AG fuses while requiring one-third the space
    • Resistant to corrosion from most cleaning fluids and solvents
    • Available with fuse holders attached
    • Optional indicators show when fuses blow

    3.6x10mm Fuses – Axial Radial Thru Hole Fuses

    Light ballasts, power supply modules, and ac power adapters depend on 3.6×10 mm axial radial thru hole fuses for overcurrent protection. Littelfuse produces several types of this subminiature ceramic-bodied fuse with either fast-acting or time-delayed/Slo-Blo® performance. Check the technical specifications when choosing a solution for your application.
    • Rated at 250 V ac
    • Available with very low ampere ratings (e.g., 100 mA)
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Available with single pigtail leads
    • Small sizes make these fuses good choices for overcurrent protection where space is limited
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    3AB/3AG 6.3x32mm Fuses - Axial Radial Thru Hole Fuses

    3AB/3AG 6.3x32mm Fuses – Axial Radial Thru Hole Fuses

    Littelfuse makes several types of 3AB/3AG 6.3×32 mm fuses with axial leads for overcurrent protection. We offer the subminiature fuses with glass or ceramic bodies. Some of the fuses are fast-acting, and others incorporate Slo-Blo® technology to deliver time-delayed circuit protection. You will find our 6.3×32 mm fuses protecting uninterruptible power supplies, silicon-controlled rectifiers, transient voltage surge suppressors in outdoor electrical equipment, and integrated circuits and semiconductors in household appliances, HVAC units, smart meters, and LED displays.
    • Operate in ac and dc electrical systems
    • Wide range of current ratings, from 32 V dc to 1 kV dc
    • High interrupting ratings (e.g., 10 kA at 125 V ac)
    • Meet IEC standards
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Glass or ceramic bodies ensure durability
    • NFPA 70-compliant fuses available
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes

    5x20mm Fuses – Axial Radial Thru Hole Fuses

    Littelfuse makes several types of 5×20 mm fuses with axial leads to provide supplemental overcurrent protection to circuits and other electronic devices such as transient voltage surge suppressors. We offer the subminiature fuses with glass or ceramic bodies. Some of the fuses are fast-acting, and others incorporate Slo-Blo® technology to deliver time-delayed circuit protection. You will find our 5×20 mm fuses protecting uninterruptible power supplies, medical equipment, smart meters, LCD screens, and integrated circuits in household appliances.
    • Operate in ac and dc electrical systems
    • Wide range of voltage ratings, from 125 V ac to 500 V ac
    • Available with very low ampere ratings (e.g., 32 mA)
    • Meet IEC standards
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Glass or ceramic bodies ensure durability
    • Select fuses available in bladed configurations
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes

    5x25mm Fuses – Axial Radial Thru Hole Fuses

    The ceramic 5×25 mm fuses Littelfuse produces provide supplemental overcurrent protection in household appliances and consumer electronics. We offer these axial leaded fuses with fast-acting or time-delayed performance.
    • Rated at 250 V ac
    • Available with low ampere ratings (e.g., 80 mA)
    • Low-to-medium interrupting ratings of 80 A at 250 V ac and 1.5 kA at 230 V ac
    • Operate in temperatures ranging from –25 ℃ to +70 ℃
    • Small sizes make these fuses good choices for overcurrent protection where space is limited
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards

    6x25mm Fuses – Axial Radial Thru Hole Fuses

    The ceramic-bodied 6×25 mm fuses with axial leads produced by Littelfuse provide overcurrent protection to uninterruptible power supplies, electronics base units, and telecommunications equipment.
    • Operate in ac and dc electrical systems
    • Available with ampere ratings of 5 A to 40 A
    • Interrupting ratings of 2.5 kA at 70 V dc and 1.5 kA at 250 V ac
    • UL Recognized in Canada and the United States
    • Certified lead-free, halogen-free, and RoHS compliant
    • Ideally suited for circuit protection in telecom systems
    • 30 A and 40 A fuses available with built-in surge suppressors
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    Ballast Fuses

    Ballast Fuses

    Ballast fuses provide overcurrent protection in light ballasts and power inverters. Littelfuse makes two versions of these flat, fast-acting fuses. Our surface mount ballast fuse is designed specifically for soldering onto a printed circuit board. Our axial radial thru hole ballast fuse comes with wire leads attached. Both boast miniature designs and high reliability.
    • Rated at 125 V ac, 250 V ac, 277 V ac, and 350 V ac
    • Available with ampere ratings from 2 A to 10 A
    • Interrupting rating of 100 A at 350 V ac
    • Interrupting rating of 50 A at 125 V dc
    • UL, CSA, and NMX 248-1 Recognized
    • Certified lead-free and RoHS compliant
    • Modeled on MINI® automotive fuses
    • Low resistance
    • Color coding of housings aids identification by ampere rating
    • Compatible with reflow or wave soldering processes
    Barrier Network Fuses - Axial Radial Thru Hole Fuses

    Barrier Network Fuses – Axial Radial Thru Hole Fuses

    Safety standards require fast-acting barrier network fuses for electronic equipment used in settings where arc flashes or overheating due to overcurrent events could spark fires or explosions of dust or gas. Littelfuse makes ceramic-bodied cartridge fuses that are specifically designed to enhance safety in hazardous areas. Each fuse operates in ac or dc systems, meets EN 50020 standards, and has a high interrupting rating of 4 kA at 250 V. The most common applications for these fuses include flow meters and automatic test equipment.
    • Rated at 250 V dc
    • Available with ampere ratings of 40 mA to 250 mA
    • Insulation resistance after opening of < 10 kΩ
    • Meet EN 50020 standards
    • UL Recognized in Canada and the United States
    • Certified halogen-free and RoHS compliant
    • Specifically designed for use in intrinsically safe equipment
    • Low ampere ratings improve overall safety by allowing equipment designers to lower power requirements
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes

    Micro TR3 Fuses

    PICO® fuses provide overcurrent protection in electronic ballast, LCDs, networking equipment, and power supplies. Littelfuse makes very fast-acting and time-delayed/Slo-Blo® versions of PICO fuses with miniature and subminiature designs that save space on printed circuit boards. We also offer a family of PICO fuses designed for use in hazardous areas where arcing or overheating could cause dust and gases to ignite or explode.
    • Rated at 32 V ac, 125 V ac, and 250 V ac
    • Available with a wide range of ampere ratings, from 62 mA to 30 A
    • Ultra-low to low internal resistance ratings (e.g., 4 mΩ, 7 Ω)
    • Operate in temperatures ranging from –55 ℃ to +125 ℃
    • UL Recognized in Canada and the United States
    • RoHS compliant
    • Military-grade versions available
    • Surface mount, axial radial thru hole, and axial leaded configurations available
    • Vibration resistant

    PICO® Fuses – Axial Radial Thru Hole Fuses

    MICRO® TR3 fuse provide very fast-acting overcurrent protection in many applications requiring subminiature circuit protection devices. The fuses work particularly well in high-voltage, low-current systems. Several TR3 fuses made by Littelfuse are optimized for specific applications, including satellites and avionics.
    • Rated at 125 V dc
    • Available with ampere ratings from 2 mA to 5 A
    • Available with an extremely broad range of resistance ratings (e.g., 27.5 mΩ, 280 Ω)
    • CSA certified
    • UL Recognized
    • Military-grade versions available
    • Surface mount and axial radial thru hole configurations available
    • Vibration resistant

    TE5 Fuses

    Subminiature TE5 fuses with axial leads provide overcurrent and short circuit protection in electronic ballast, telecommunications equipment, and consumer electronics. Littelfuse makes both fast-acting and time-delayed/Slo-Blo® versions of TE5 fuses. Each is optimized for use in high-voltage, low-current applications.
    • Rated from 65 V ac to 300 V ac
    • Available with ampere ratings from 125 mA to 6.3 A
    • Very low to low internal resistance ratings (e.g., 9.75 mΩ, 115 mΩ)
    • UL Recognized in Canada and the United States
    • Certified lead-free and RoHS compliant
    • Military-grade versions available
    • Surface mount and plug-in configurations available
    • Vibration resistant
    • Compatible with wave soldering processes
    TE7 Fuses

    TE7 Fuses

    TE7 fuses with axial leads provide time-delayed overcurrent protection to circuits in battery chargers, consumer electronics, power supplies, and industrial control modules. Each TE7 fuse boasts subminiature design, which save spaces on printed circuit boards and in equipment.
    • Rated at 250 V ac and 300 V ac
    • Available with ampere ratings from 800 mA to 6.3 A
    • Very low to low internal resistance ratings from 10 mΩ to 188.7 mΩ
    • Operate at temperatures ranging from –40 ℃ to +125 ℃
    • Meet IEC, K60127-1, and K60127-4 standards
    • UL Recognized or UL Listed in Canada and the United States
    • Certified lead-free, halogen-free, and RoHS compliant
    • Excellent surge tolerance due to high I2t values
    • Vibration resistant
    • Compatible with wave soldering processes
    TR5 Fuses

    TR5 Fuses

    TR5 fuses with axial leads provide overcurrent and short circuit protection in battery chargers, electronic ballast, consumer electronics, and industrial control modules. Littelfuse makes fast-acting and time-delayed/Slo-Blo® versions of TR5 fuse. Each boasts subminiature design, which saves space on printed circuit boards.
    • Rated at 250 V ac and 300 V ac
    • Very low to low internal resistance ratings from 4.2 mΩ to 100 mΩ
    • UL Recognized or UL Listed in Canada and the United States
    • Certified lead-free, halogen-free, and RoHS compliant
    • Military-grade versions available
    • Surface mount and plug-in configurations available
    • Vibration resistant
    • Compatible with wave soldering processes

    Cartridge Fuses

    Littelfuse offers reliable overcurrent protection via our wide range of different cartridge fuses types and sizes. We have dependable solutions for applications such as automotive, agricultural, industrial, power generation, data centers, and residential systems. Available in a variety of cartridge fuse sizes and ampere ratings, these fuses are engineered to suit both standard and specialized needs. Different types of cartridge fuses—such as fast-acting, medium-acting, and time-delay—are ideal for specific application requirements. For example, automotive cartridge fuses often use color-coded thermoplastic housings, while solar power systems may use glass-body fuses. Choosing the right type ensures proper circuit protection and system performance.

    10x32mm Fuses

    10x32mm Fuses

    Miniature 10×32 mm cartridge fuses produced by Littelfuse provide overcurrent protection in onboard EV chargers and EV charging stations. The automotive fuses are also used to protect uninterruptible power supplies for data centers and electrical power inverters and rectifiers. Our 10×32 mm cartridge fuses boast high interrupting ratings (e.g., 2 kA at 500 V ac), and they work in both ac and dc systems. The fuses’ small size makes them mountable on printed circuit boards.
    • Rated at 300 V ac and 500 V ac
    • High interrupting ratings (e.g., 10 kA at 500 V ac)
    • Operate in ac and dc electrical systems
    • Certified lead-free, halogen-free, and RoHS compliant
    • Created explicitly for use with high-current, high-voltage circuits
    • Versions specifically designed for automotive, networking, and industrial electric motor control applications
    • Can mount on printed circuit boards or bus bars
    • Configuration with standoff leads protects PCB components from electrostatic discharge
    10x38mm Fuses

    10x38mm Fuses

    Onboard EV chargers rely on 10×38 mm fuses for primary overcurrent protection. In addition to serving as automotive fuses, these cartridge fuses provide supplemental overcurrent protection in industrial power supply equipment and elevator motors. The fuses’ small size make them good choices for mounting on printed circuit boards.
    • Rated at 1 kV dc
    • Interrupting rating of 10 kA at 1000 V dc
    • UL recognized
    • Certified lead-free, halogen-free, and RoHS compliant
    • Created explicitly for use with high-current, high-voltage circuits
    • Manufactured in compliance with AEC-Q200 standards
    • Can mount on printed circuit boards or bus bars
    • Configuration with standoff leads protects PCB components from electrostatic discharge
    10x38mm Fuses

    10x38mm Fuses

    Onboard EV chargers rely on 10×38 mm fuses for primary overcurrent protection. In addition to serving as automotive fuses, these cartridge fuses provide supplemental overcurrent protection in industrial power supply equipment and elevator motors. The fuses’ small size make them good choices for mounting on printed circuit boards.
    • Rated at 1 kV dc
    • Interrupting rating of 10 kA at 1000 V dc
    • UL recognized
    • Certified lead-free, halogen-free, and RoHS compliant
    • Created explicitly for use with high-current, high-voltage circuits
    • Manufactured in compliance with AEC-Q200 standards
    • Can mount on printed circuit boards or bus bars
    • Configuration with standoff leads protects PCB components from electrostatic discharge
    2AG 5x15mm Fuses - Cartridge Fuses

    2AG 5x15mm Fuses – Cartridge Fuses

    Glass-bodied axial radial thru hole 2AG 5×15 mm fuses provide overcurrent protection to telecommunications equipment and ballast for fluorescent lights. The subminiature fuses can also be soldered onto printed circuit boards and used to protect integrated circuits for household appliances.
    • Rated from 125 V ac to 350 V ac
    • Available with a very wide range of resistance ratings (e.g., 31.7 µΩ, 3.9 Ω)
    • Meet UL and IEC standards
    • Certified lead-free and RoHS compliant
    • Perform identically to 3AG fuses while requiring one-third the space
    • Resistant to corrosion from most cleaning fluids and solvents
    • Available with different lead sizes and placements
    • Compatible with wave soldering processes
    3.6x10mm Fuses - Cartridge Fuses

    3.6x10mm Fuses – Cartridge Fuses

    Light ballasts, power supply modules, and ac power adapters depend on 3.6×10 mm cartridge fuses for overcurrent protection. Littelfuse produces several types of this subminiature ceramic-bodied fuse with either fast-acting or time-delayed/Slo-Blo® performance. Check the technical specifications when choosing a solution for your application.
    • Rated at 250 V ac
    • Available with very low ampere ratings (e.g., 100 mA)
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Small sizes make these fuses good choices for overcurrent protection where space is limited
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes

    3AB/3AG 6.3x32mm Fuses – Cartridge Fuses

    Littelfuse makes several types of 3AB/3AG 6.3×32 mm fuses for overcurrent protection. We offer the cartridge fuses with glass or ceramic bodies. Some of the fuses are fast-acting. Others incorporate Slo-Blo® technology to deliver time-delayed circuit protection. A few change color when they blow. You will find our 6.3×32 mm fuses protecting uninterruptible power supplies, silicon-controlled rectifiers, transient voltage surge suppressors in outdoor electrical equipment, and integrated circuits in household appliances, HVAC units, smart meters, and LED lighting arrays.
    • Operate in ac and dc electrical systems
    • Wide range of current ratings, from 32 V dc to 1 kV dc
    • High interrupting ratings (e.g., 10 kA at 125 V ac)
    • Meet IEC standards
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Glass or ceramic bodies ensure durability
    • Some versions feature indicators that show when fuses blow
    • Available with fuse holders attached
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    5x20mm Fuses - Cartridge Fuses

    5x20mm Fuses – Cartridge Fuses

    Littelfuse makes several types of 5×20 mm fuses to provide supplemental overcurrent protection to circuits and other electronic devices such as transient voltage surge suppressors. We offer the cartridge fuses with glass or ceramic bodies. Some of the fuses are fast-acting, and others incorporate Slo-Blo® technology to deliver time-delayed circuit protection. A few change color when they blow. You will find our 5×20 mm fuses protecting uninterruptible power supplies, medical equipment, smart meters, LCD screens, and integrated circuits in household appliances.
    • Operate in ac and dc electrical systems
    • Wide range of voltage ratings, from 125 Vac to 600 Vac & 125 Vdc to 450 Vac
    • Available with very low ampere ratings (e.g., 32 mA)
    • Meet IEC or UL standards
    • All fuses UL Listed or UL Recognized
    • Certified lead-free and RoHS compliant
    • Glass or ceramic bodies ensure durability
    • Available in cartridge and axial lead form
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    5x25mm Fuses - Cartridge Fuses

    5x25mm Fuses – Cartridge Fuses

    The ceramic 5×25 mm fuses Littelfuse produces provide supplemental overcurrent protection in household appliances and consumer electronics. We offer fast-acting and time-delayed options. Our 5×25 mm cartridge fuses also feature indicators. When one blows, it changes color to make the process of finding and replacing it easier.
    • Rated at 250 V ac
    • Available with low ampere ratings (e.g., 80 mA)
    • Low-to-medium interrupting ratings of 80 A at 250 V ac and 1.5 kA at 230 V ac
    • Operate in temperatures ranging from –25 ℃ to +70 ℃
    • Nickel-plated brass end caps
    • Blown fuse indicator color differs for each amperage rating (e.g., red for 100 mA, black for 400 mA) to ensure a new fuse matches the old one
    • Small sizes make these fuses good choices for overcurrent protection where space is limited
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards

    6x25mm Fuses – Cartridge Fuses

    The ceramic-bodied 6×25 mm fuses produced by Littelfuse provide overcurrent protection to uninterruptible power supplies, electronics base units, and telecommunications equipment.
    • Operate in ac and dc electrical systems
    • Available with ampere ratings of 5 A to 40 A
    • Interrupting ratings of 2.5 kA at 70 V dc and 1.5 kA at 250 V ac
    • UL Recognized in Canada and the United States
    • Certified lead-free, halogen-free, and RoHS compliant
    • Ideally suited for circuit protection in telecom systems
    • 30 A and 40 A fuses available with built-in surge suppressors
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    6x32mm Fuses - Cartridge Fuses

    6x32mm Fuses – Cartridge Fuses

    Originally developed to provide overcurrent protection to onboard chargers in EVs, compact 6×32 mm cartridge fuses work in many high-power automotive applications. The AEC-Q200–qualified fuses boast high interrupting ratings, and their standoff leads make them easy to mount on printed circuit boards.
    • Rated at up to 500 V ac
    • Interrupting ratings up to 10 kA at 500 V ac
    • Operate at temperatures ranging from –55 ℃ to +125 ℃
    • UL Recognized
    • Lead-free, halogen-free, and RoHS compliant
    • Thru-hole configurations available
    • Compact, lightweight designs
    • Standoff leads simply soldering on PCBs

    Barrier Network Fuses – Cartridge Fuses

    Fast-acting ceramic-bodied barrier network fuses with axial leads prevent arc flashes and overheating due to overcurrent events. Safety regulations require use of these overcurrent protection devices in equipment such as flow meters and automatic test equipment deployed in areas where dust or gases could catch fire or explode. All barrier network fuses made by Littelfuse meet EN 50020 standards and have high interrupting ratings of 4 kA at 250 V.
    • Rated at 250 V dc
    • Available with ampere ratings of 40 mA to 250 mA
    • Insulation resistance after opening of < 10 kΩ
    • Meet EN 50020 standards
    • UL Recognized in Canada and the United States
    • Certified halogen-free and RoHS compliant
    • Specifically designed for use in intrinsically safe equipment
    • Low ampere ratings improve overall safety by allowing equipment designers to lower power requirements
    • Ceramic bodies ensure durability
    • Can mount on printed circuit boards
    • Compatible with wave soldering processes
    Load Switch

    Load Switch

    The integrated load switch ICs incorporate cutting-edge technology that achieves industry-leading performance in ultralow power consumption (low IQ, ISD, and RDS(on)), empowering designers to curtail parasitic leakage current, enhance system efficiency, and extend battery lifespan.

    Load Switch

    Automotive - PolySwitch® Resettable PPTC Devices

    Automotive – PolySwitch® Resettable PPTC Devices

    Solid-state PolySwitch® PPTC bladed devices are resettable fuses. They act like resistors, lowering the flow of current as they heat up in response to an overcurrent. Once the overcurrent abates and the temperature of the PolySwitch fuse lowers, current resumes flowing. The small size and high reliability of these bladed resettable fuses make them ideal for protecting thin wires connected to micro motors for power windows, power mirrors, sunroofs and seat controls where fuse boxes are impractical.
    • Rated at 14 V dc or 16 V dc and 100 A
    • Maximum time to trip of 8 s to 13 s
    • Tin-plated H65 brass terminals and PBT (polybutylene terephthalate) insulators
    • UL 94 flammability rating 0f V-0
    • Refer to PS300, PS400, and SAE-J2685
    • ELV compliant
    • Certified lead-free and RoHS compliant
    • Designed for serial placement along wiring harnesses, reducing need for fuse boxes
    • Will reset unless experiencing massive amperage overload
    • Enable use of thinner wires
    • Proven to perform reliably in harsh environments
    • Suited for high-volume electronics assembly
    Automotive - PolySwitch® Resettable PPTC Devices

    Automotive – PolySwitch® Resettable PPTC Devices

    Solid-state PolySwitch® PPTC bladed devices are resettable fuses. They act like resistors, lowering the flow of current as they heat up in response to an overcurrent. Once the overcurrent abates and the temperature of the PolySwitch fuse lowers, current resumes flowing. The small size and high reliability of these bladed resettable fuses make them ideal for protecting thin wires connected to micro motors for power windows, power mirrors, sunroofs and seat controls where fuse boxes are impractical.
    • Rated at 14 V dc or 16 V dc and 100 A
    • Maximum time to trip of 8 s to 13 s
    • Tin-plated H65 brass terminals and PBT (polybutylene terephthalate) insulators
    • UL 94 flammability rating 0f V-0
    • Refer to PS300, PS400, and SAE-J2685
    • ELV compliant
    • Certified lead-free and RoHS compliant
    • Designed for serial placement along wiring harnesses, reducing need for fuse boxes
    • Will reset unless experiencing massive amperage overload
    • Enable use of thinner wires
    • Proven to perform reliably in harsh environments
    • Suited for high-volume electronics assembly
    Telecom & Line-Rated

    Telecom & Line-Rated

    PolySwitch® telecom resettable PPTCs protect telephony and networking equipment from damage due to short-lived high-voltage fault currents. As resettable fuses, the polymer positive temperature coefficient devices also provide overcurrent protection. One example of what these PPTCs do is open circuits after lightning strikes causes massive overvoltage events. The resettable fuses also respond quickly to surges of inductive current and to power crosses when T1 lines contact ac power lines.
    • Fast-acting
    • Available with ratings from 60 V dc to 250 V dc
    • Interrupting ratings of 250 V dc or 600 V dc
    • Low resistance ratings (e.g., 4–20 Ω, 6–22 Ω)
    • Very low hold current ratings (e.g., 90–180 mA, 100–400 mA)
    • UL Recognized
    • Certified lead-free and RoHS compliant
    • Suitable for use with legacy telephone lines (POTS) and digital telecom systems
    • Available in chip, surface mount, and radial leaded configurations
    • Available with binned and sorted narrow resistance ranges
    • Help users comply with ITU requirements
    • Compatible with high-volume electronics assembly

    TD & Chip Resettable

    TD and chip resettable PPTC fuses provide short circuit and overcurrent protection in small automotive motors such as those for power windows and seat adjusters. “TD” stands for “terminal device.” This indicates the polymer positive temperature coefficient devices install as close to motor windings as possible. That placement ensures the resettable automotive fuses trip quickly when overcurrent events or short circuits threaten to cause thermal damage. Since electric motors inside vehicles take all shapes and sizes, Littelfuse works with manufacturers to custom design TD and chip resettable fuses for each application.
    • Fast-acting
    • Available with voltage ratings from 16 V dc to 60 V dc
    • Available with resistance ratings of 10 mΩ to 100 mΩ
    • Sized and configured to fit inside motor housings
    • Custom designed for each application
    • Designed to produce minimal electromagnetic interference
    • Shock- and vibration-resistant
    • Lack of moving parts eliminates risk for arcing

    Surface Mount – PolySwitch® Resettable PPTC Devices

    Surface mount PolySwitch® resettable PPTC fuses solder onto printed circuit boards. The surface mount devices employ polymer positive temperature coefficient technology to protect electronic components and integrated circuits from inrushes of current. Since the SMD fuses only blow when massively overloaded, they rarely require replacement. The resettable fuses’ miniature and subminiature sizes make them ideal choices when space is limited, such as in mobile phones, portable medical devices, and USB peripherals. Littelfuse also offers AEC-Q200-qualified surface mount PPTC fuses for automotive applications.
    • Available with a very wide range of operating voltage ratings, from 6 V dc to 250 V dc
    • Maximum time to trip below 1 s
    • Ultra-low to low hold current ratings (e.g., 5 mA, 600 mA, 3.1 A)
    • Available with trip currents between 50 mA and 10 A
    • Certified halogen-free and RoHS compliant
    • Select devices available with radial leads
    • Low-profile designs save space on boards and in electronics
    • Compatible with high-volume PCB assembly processes
    • Compatible with reflow soldering processes
    Radial Leaded - PolySwitch® Resettable PPTC Devices

    Radial Leaded – PolySwitch® Resettable PPTC Devices

    Radial leaded PolySwitch® resettable PPTC devices provide overcurrent protection to circuits, wiring harnesses, and printed circuit board components. Compact and suitable for soldering onto PCBs, these devices employ polymer positive coefficient temperature technology. This means the surface mount or inline devices rarely need replacing. Littelfuse makes several types of radial leaded PPTC devices for specific uses. For instance, our AEC-Q200-qualified devices are optimized for automized applications. Devices in our ARGF series offer ideal choices for protecting telecommunications equipment.
    • Available with a very wide range of operating voltage ratings, from 16 V dc to 600 V dc
    • Maximum times to trip from 1 s to 22 s
    • Available with an extremely wide range of hold current ratings, from 50 mA to 14 A
    • Available with trip currents between 160 mA and 27.3 A
    • Maximum ampere ratings of 100 A
    • UL Recognized
    • Certified lead-free, halogen-free and RoHS compliant
    • Available in in many different sizes and shapes, as well as with a variety of lead styles and lengths
    • Select devices also provide overvoltage protection
    • Single-use devices available within select series
    • Compatible with high-volume electronics assembly processes

    Radial Leaded – PolySwitch® Resettable PPTC Devices

    Low Rho Surface Mount PPTC resettable fuses offer the same overcurrent protection as larger PolySwitch® polymeric positive temperature coefficient devices. They also delivers the benefits of ultra-low internal resistance and ultra-low voltage drop while requiring much less printed circuit board space. Small enough to fit in data cable connectors, Low Rho Surface Mount PPTC resettable fuses also protect circuits in rechargeable Li-ion batteries, mobile phones, digital cameras, and LCD and LED displays.
    • Available with a wide range of ampere ratings, from 100 mA to 9 A
    • Fast-acting performance
    • Ultra-low internal resistance
    • Ultra-low voltage drop
    • Maximum fault current of 50 A
    • UL Recognized and TUV-approved
    • Certified lead-free, halogen-free, and RoHS compliant
    • Miniature size and thin profile save space on PCBs
    • Small enough to fit in USB ports and data cable connectors
    • Perform as well as large PPTC resettable fuses
    • Compatible with high temperature solders and high-volume PCB production

    Low Resistance

    Low Rho Surface Mount PPTC resettable fuses offer the same overcurrent protection as larger PolySwitch® polymeric positive temperature coefficient devices. They also delivers the benefits of ultra-low internal resistance and ultra-low voltage drop while requiring much less printed circuit board space. Small enough to fit in data cable connectors, Low Rho Surface Mount PPTC resettable fuses also protect circuits in rechargeable Li-ion batteries, mobile phones, digital cameras, and LCD and LED displays.
    • Available with a wide range of ampere ratings, from 100 mA to 9 A
    • Fast-acting performance
    • Ultra-low internal resistance
    • Ultra-low voltage drop
    • Maximum fault current of 50 A
    • UL Recognized and TUV-approved
    • Certified lead-free, halogen-free, and RoHS compliant
    • Miniature size and thin profile save space on PCBs
    • Small enough to fit in USB ports and data cable connectors
    • Perform as well as large PPTC resettable fuses
    • Compatible with high temperature solders and high-volume PCB production
    Battery Strap

    Battery Strap

    Battery straps protect rechargeable batteries from overcurrent events, short circuits, and overcharging. As polymer positive temperature coefficient (PPTC) fuses, battery straps reset instead of blowing. Their high reliability, small size, and light weight make battery straps good choices for overcurrent protection in portable medical devices, game controllers, shavers, electric toothbrushes, and robotic vacuums. Several battery straps produced by Littelfuse also meet the international standards for use as automotive fuses.
    • Available with hold current ratings from 1.1 A to 13 A
    • Available with trip current ratings from 2.7 A to 21.2 A
    • Available with maximum voltage ratings from 12 V dc to 30 V dc
    • Available with activation temperatures from 85 ℃ to 125 ℃
    • UL Recognized
    • Certified lead-free, halogen-free, and RoHS compliant
    • High current interrupt capabilities
    • Available in multiple low-profile shapes and sizes
    • Low resistance increases battery operating times
    • Compatible with high-volume electronics assembly
    HCRTP

    HCRTP

    Reflowable thermal protectors (RTPs) provide overtemperature protection to batteries and temperature-sensitive electronics in data centers and telecommunications systems. The devices open when the temperatures of the circuits in which they are included rise above set points that are much higher than the maximum safe operating temperatures of the circuits. RTPs are often used in cars and trucks, and Littelfuse makes AEC-Q200–qualified automotive RTPs optimized for mounting on printed circuit boards.
    • Typical opening temperatures of 220 ℃
    • Rated at 16 V dc
    • Interrupting ratings of 500 A at 16 V dc
    • Very low maximum initial resistance ratings of 85 µΩ
    • ELV compliant
    • Certified lead-free, halogen-free and RoHS compliant
    • High hold current capabilities
    • Low forward voltage drops
    • Highly resistant to shocks and vibrations
    • Miniature design saves space and weight

    PolySwitch® Resettable PPTC Devices

    PolySwitch® and POLYFUSE® resettable devices from Littelfuse provide reliable overcurrent protection in automotive, telecommunication, and power supply applications. The solid state polymeric positive temperature coefficient (PPTC) devices increase in resistance as their elements heat. This ensures current flows safely and keeps the fuse from blowing. We offer surface mount, low-resistance, bladed, radial leaded, line voltage rated, and battery strap resettable fuses. Our TD and Chip PolySwitch devices are ideal for use with small motors for vehicle windows and seat controls.

    Automotive - Reflowable Thermal Protectors

    Reflowable thermal protectors (RTPs) for automotive applications provide overtemperature protection in much the same way that automotive fuses provide overcurrent protection. RTPs open when the temperature of the circuit in which it is included rises above a set point that is much higher than the maximum safe operating temperature of the circuit. Littelfuse makes AEC-Q200–qualified automotive RTPs optimized for mounting on printed circuit boards and protecting batteries. The devices can also be used to protect temperature-sensitive electronics in data centers and telecommunications systems.