Overcurrent Fuses

Overcurrent fuses are protective components designed to interrupt excessive current and safeguard electronic systems from overheating, short-circuit damage, and electrical faults. Featuring precise melting characteristics, fast response times, and stable performance across wide temperature ranges, these fuses deliver reliable protection in applications such as power supplies, automotive electronics, battery systems, consumer devices, and industrial control equipment. By breaking the circuit when current exceeds the rated threshold, overcurrent fuses prevent component failure and ensure long-term system safety. Browse the categories below to find the right fuse series for your required current rating, voltage rating, and application environment.

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Product Selection Matrix

Type	Resistance Range	Key Features	Typical Applications
Chip Fuse (SMD Type)	10 mΩ – 500 mΩ	Compact size, fast response, low resistance	Mobile devices, communication modules, consumer electronics
Brick Fuse	0.5 mΩ – 20 mΩ	High current handling, strong thermal stability, low voltage drop	Battery management systems, DC-DC converters, automotive electronics
Bolt Down Fuse	< 0.5 mΩ	High power rating, durable housing, reliable contact	EV batteries, power distribution units, energy storage
SMD Resettable (PTC Fuse)	0.1 Ω – 10 Ω	Self-resetting, reusable, space-saving design	IoT devices, small appliances, portable power systems
DIP PPTC Fuse	0.2 Ω – 15 Ω	Reusable, through-hole mounting, cost-effective	Power adapters, telecom, industrial control
PV Fuse	< 1 mΩ	High voltage endurance, arc suppression, stable protection	Solar panels, inverters, renewable energy systems
EV Fuse	< 1 mΩ	Designed for high voltage and current, meets automotive standards	Electric vehicles, charging stations, power modules
Ceramic Tube Fuse	10 mΩ – 200 mΩ	Strong insulation, flame-retardant, stable performance	Power supplies, household appliances, test equipment

Types of Overcurrent Fuses

Chip Fuses

Chip Fuses, also known as surface-mount fuses (SMD fuses), are compact circuit protection devices designed to safeguard electronic systems from overcurrent and short-circuit conditions. With their small footprint and precise current-limiting performance, chip fuses are ideal for high-density PCB designs where space efficiency and reliability are critical.

Compact SMD designFast-acting protectionStable performance

Brick Fuses

Brick Fuses are high-current, surface-mount fuses designed to provide reliable overcurrent protection in power-intensive electronic systems. Their robust rectangular structure—similar to a “brick” shape—offers superior thermal stability, mechanical strength, and efficient heat dissipation, making them ideal for demanding environments.

High current capacityRobust constructionReliable protection

Smd Resettable Fuses

SMD Resettable Fuses, also known as PTC (Positive Temperature Coefficient) fuses, are polymer-based circuit protection devices that automatically reset after a fault condition is cleared. Unlike traditional one-time fuses, they return to their normal conductive state once the overcurrent or overtemperature event subsides, eliminating the need for replacement and reducing maintenance costs.

Self-resetting designCompact SMD packageLong-term reliability

Fuse Series Selection Guide

The following table only shows a portion of the products. For more products, please refer to our detail pages. You can and tell us your requirements. We can provide you with a one-stop solution.

Model	Interrupting Rating	Voltage Rating(V)	Ampere Rating(A)	Typical Cold Resistance(mΩ)	Typical Melting I²t(A²Sec)	Dimension(mm)	Automotive
0402FA-R500-L	35A @35V	35V	0.5	0.165Ω	0.007	0.04x0.02	-
0402TD-R500-L	35A @35V	35V	0.5	0.165Ω	0.0085	0.04x0.02	-
0603FA-R750-L	35A @35V	35V	0.75	0.11Ω	0.018	0.06x0.03	-
0603FA-R200-L	35A @35V	35V	0.2	1.5Ω	0.001	0.06x0.03	-
0603FA-1.5A-L	35A @35V	35V	1.5	0.05Ω	0.07	0.06x0.03	-
1214FA-60A-W	300A@24VDC	24VDC	60	0.68	530	3.2×3.6×1.1	No
1214FA-50A-W	300A@24VDC	24VDC	50	0.78	330	3.2×3.6×1.1	No
1214FA-40A-W	300A@24VDC	24VDC	40	0.92	283	3.2×3.6×1.1	No
1245FA-5A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	5	18	14.25	12×4.5	No
1245FA-4A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	4	23	9.12	12×4.5	No
1245FA-3.15A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	3.15	33	4.58	12×4.5	No
1245FA-2.5A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	2.5	40	2.93	12×4.5	No
1245FA-2A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	2	87	2.64	12×4.5	No
1245FA-1.6A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	1.6	115	1.58	12×4.5	No
1245FA-1.25A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	1.25	135	1.17	12×4.5	No
1245FA-1A-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	1	168	0.72	12×4.5	No
1245FA-R800-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	0.80	230	0.41	12×4.5	No
1245FA-R630-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	0.63	390	0.14	12x4.5	No
1245FA-R500-S	100A@600Vdc 100A@350Vac 1500A@300Vac	600VDC	0.5	530	0.08	12×4.5	No

PROSEMI TECHNOLOGY

Precision Manufacturing

Specialized in SMD and brick fuses with accurate current ratings and consistent performance.

Advanced Production

Automated lines ensure low resistance, fast response, and excellent heat dissipation.

Resettable Fuse Expertise

PTC resettable designs provide reusable circuit protection and lower maintenance costs.

Quality & Safety Commitment

All products meet RoHS and AEC-Q200 standards, ensuring durability and reliability across industries.

Overcurrent Fuses – FAQs

Where Are Overcurrent Fuses Commonly Used?

They are widely applied in battery management systems, automotive electronics, DC-DC converters, and industrial control equipment.

How Do I Choose The Right Fuse?

Select a fuse rated about 125–150% of your normal operating current and ensure it matches the voltage, time-delay, and environmental conditions of your circuit.

How Do Overcurrent Fuses Work?

They contain a metal element that melts when excessive current flows through, instantly disconnecting the circuit to prevent overheating or short circuits.

What Types Of Overcurrent Fuses Are Available?

PROSEMI provides a full range of overcurrent protection products, including:

Chip Fuses – compact SMD design for consumer and portable devices.

SMD Resettable (PTC) Fuses – automatically recover after fault removal.

Brick Fuses – high-current fuses for power modules and automotive systems.

EV Fuses – optimized for electric vehicle battery and charging systems.

Ceramic Tube Fuses – traditional high-voltage protection with strong insulation.

PV Fuses – designed for photovoltaic (solar) power protection.

DIP PPTC Fuses – through-hole resettable fuses for industrial and power supplies.

Overcurrent Protection Device