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Silver rectangular automotive circuit breaker with stud terminals and thermoplastic housing

Bussmann

Bussmann CBC-40B Automotive Circuit Breaker 40 A

SKU CH-VQQC-HGPJT

Plug-in 40 A automotive circuit breaker with automatic reset, rated 14 V DC and 1.5 kA interrupt, SAE J553 compliant

  • Reliable over-current protection for 40 A automotive circuits
  • Automatic reset restores power without manual intervention
  • SAE J553 compliance confirms heavy-duty design for trucks
  • 5 kA interrupt rating at 14 V DC handles fault currents
  • #10-32 stud terminals accept standard ring terminals

40 A Automotive Circuit Breaker

The Bussmann CBC-40B is a heavy-duty automatic-reset circuit breaker rated at 40 A for 14 V DC truck electrical systems. It mounts via a plug-in surface stud and accepts #10-32 ring terminals. The thermoplastic and metal housing meets SAE J553 requirements for overcurrent protection.

1.5 kA Interrupt Rating at 14 V DC

This breaker can safely interrupt up to 1.5 kA of fault current at its rated voltage. Circuits that may see higher prospective short-circuit currents need a device with a greater interrupt rating. The automatic reset function restores power after a trip without manual intervention.

Automatic Reset Type

The breaker cycles open and closed until the overload is removed, which suits non-critical accessory circuits. It is not suitable for applications that require a manual reset or a latching trip to prevent repeated cycling on a persistent fault.

How it compares

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Price $5.99
Cheaper than about 97% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

Which current rating should I select for a 40 A automotive circuit?

Choose the 40 A version; it is rated for 40 A at 14 V DC with a 1.5 kA interrupt rating.

What does the 1.5 kA interrupt rating mean when the breaker is installed?

It can safely interrupt up to 1.5 kA of fault current at 14 V DC.

What SAE standard applies and what does it cap in practice?

SAE J553 governs the breaker; it caps the interrupt capability at 1.5 kA at 14 V DC.

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