A bolt down fuse is a type of high-current fuse that is fastened with bolts for a secure and vibration-resistant connection. Unlike plug-in or blade fuses, bolt down fuses are designed to handle higher amperages, making them ideal for vehicles, heavy machinery, and renewable energy applications where safety and reliability are critical.
At Prosemi, we specialize in providing reliable MIDI and MEGA DC Bolt Down Fuses designed for high current protection in automotive, industrial, and energy systems. With a secure bolt-mounted design, our fuses ensure durability, stability, and consistent performance even under demanding conditions.
Prosemi ensures timely and efficient supply of our products. The standard lead time for Bolt Down Fuses is 6 weeks. For urgent requirements or special specifications, please contact our team to confirm availability.
Rated Voltage：32VDC, 58VDC, 70VDC
Rated Current：30-200A
Interrupting Rating: 2500A@32VDC, 1500A@58VDC, 2500A@70VDC
Allowable use conditions: -40˚C ~125˚C
Recommended installation torque: 4~6 Nm(12Nm Max.)/M5, 6~9 Nm(12Nm Max.)/M6
Metal material：Tinned copper alloy
Flammability rating：U.L. 94 V0
Standard：ISO 8820, ISO 16750, GB/T 31465, IATF 16949, ISO 20934
Precisely protects circuits for fans, heaters, batteries, and other components from large current surges.
Prevents false triggering caused by instantaneous current fluctuations, ensuring high reliability.
Automotive Applications: Applicable to various types of vehicles, including passenger cars, SUVs, trucks, buses, and off-road vehicles, providing overcurrent and short-circuit protection for circuits such as fans, heaters, batteries, and starters.
Other Applications: Also suitable for specialized equipment such as power tools, offering protection for high-current circuits in these devices.
Compatible with fuel, hybrid, and electric vehicles, providing protection for batteries, alternators, and large-gauge wiring harnesses.
Operates reliably at high temperatures (-40℃ to 125℃), with resistance exceeding 1 MΩ after disconnection, offering easy identification and installation.
Automotive Applications: Suitable for electric vehicles as well as gasoline, diesel, and hybrid vehicles, providing optimal overcurrent and short-circuit protection for batteries, alternators, and large-gauge wiring harnesses. Additionally, it is widely applied in the electrical systems of passenger cars, SUVs, trucks, buses, and off-road vehicles.
Marine Applications: Applicable to the electrical systems of vessels, offering protection for circuits connected to onboard batteries, generators, and related equipment.
| Part Number | Series | Ampere rating | Voltage Rating | Interrupting Rating | Typical Voltage Drop | Typical Cold Resistance | I2t (A2s) | Installation Torque | Number of Bolts | Features |
|---|---|---|---|---|---|---|---|---|---|---|
|
500A | 2500A @ 70VDC | 58 | 0.098 | 1,980,000 | Yes | ||||
|
|
450A | 2500A @ 70VDC | 55 | 0.12 | 1,046,000 | Yes | ||||
|
|
400A | 2500A @ 70VDC | 56 | 0.14 | 805,200 | Yes | ||||
|
|
350A | 2500A @ 70VDC | 57 | 0.18 | 629,700 | Yes | ||||
|
|
300A | 2500A @ 70VDC | 55 | 0.20 | 384,000 | Yes | ||||
|
|
250A | 2500A @ 70VDC | 53 | 0.23 | 258,000 | Yes | ||||
|
|
225A | 2500A @ 70VDC | 86 | 0.27 | 165,600 | Yes | ||||
|
|
200A | 2500A @ 70VDC | 89 | 0.32 | 150,700 | Yes | ||||
|
|
175A | 2500A @ 70VDC | 86 | 0.38 | 143,000 | Yes | ||||
|
|
150A | 2500A @ 70VDC | 89 | 0.42 | 83,100 | Yes | ||||
|
|
125A | 2500A @ 70VDC | 87 | 0.58 | 56,200 | Yes | ||||
|
|
100A | 2500A @ 70VDC | 85 | 0.57 | 36,900 | Yes | ||||
|
|
80A | 2500A @ 70VDC | 90 | 0.74 | 25,000 | Yes | ||||
|
|
200A | 2500A@70VDC | 53 | 0.21 | 138,730 | Yes | ||||
|
|
175A | 2500A@70VDC | 61 | 0.25 | 69,458 | Yes | ||||
|
|
150A | 2500A@70VDC | 61 | 0.31 | 56,700 | Yes | ||||
|
|
125A | 2500A@70VDC | 78 | 0.38 | 39,453 | Yes | ||||
|
|
100A | 2500A@70VDC | 69 | 0.49 | 27,505 | Yes | ||||
|
|
80A | 2500A@70VDC | 72 | 0.59 | 17,440 | Yes | ||||
|
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70A | 2500A@70VDC | 69 | 0.83 | 14,700 | Yes | ||||
|
|
60A | 2500A@70VDC | 70 | 0.89 | 13,500 | Yes | ||||
|
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50A | 2500A@70VDC | 73 | 0.98 | 8,750 | Yes | ||||
|
|
40A | 2500A@70VDC | 73 | 1.43 | 6,000 | Yes | ||||
|
|
30A | 2500A@70VDC | 74 | 2.03 | 4,275 | Yes |
With years of expertise in circuit protection components, Prosemi is committed to delivering high-quality products backed by excellent customer service. By choosing us, you benefit from:
Contact us today to request a quote or sample for our MIDI and MEGA DC Bolt Down Fuses and discover how Prosemi can support your projects with dependable circuit protection solutions.
Headquarters Address: Building 7, No.119 Xingpu Road, Suzhou Industrial Park, Pilot Free Trade Zone, 215126 Suzhou, PEOPLE'S REPUBLIC OF CHINA
Monday to Friday - 9:00 AM to 6:00 PM
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