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Bussmann CBC-50B 50 A automotive circuit breaker, plug-in mount, thermoplastic metal housing, stud terminals

Bussmann

Bussmann CBC-50B Automotive Circuit Breaker 50 A 14 V DC

SKU CH-Q86D-MQ30W

Protects 14 V DC truck circuits at 50 A with automatic reset and SAE J553 compliance

  • Automatic reset restores power without manual intervention
  • 50 A rating protects high-draw truck circuits reliably
  • 14 V DC design matches standard vehicle electrical systems
  • 5 kA interrupt capacity clears faults safely
  • SAE J553 compliance confirms automotive-grade construction

Circuit Breaker for 14 V DC Truck Systems

The Bussmann CBC-50B is a 50 A automatic-reset circuit breaker built for 14 V DC truck electrical systems. It uses a plug-in surface mount with #10-32 stud terminals that accept ring terminals. The housing combines thermoplastic and metal and meets SAE J553 standards for heavy-duty circuit protection.

Replaces Blown Fuses in High-Current Circuits

This breaker replaces single-use blade or cartridge fuses in circuits up to 50 A where repeated over-current events occur. The jump is worth it when a fuse would otherwise need frequent replacement and the circuit can tolerate an automatic reset after the fault clears. It interrupts up to 1.5 kA at 14 V DC.

Holds 50 A Continuously with Automatic Reset

Under sustained load the device carries its full 50 A rating without nuisance tripping. When an over-current persists the breaker trips and then automatically resets once the condition is removed, restoring power without manual intervention. The 1.5 kA interrupt rating ensures safe opening during severe short-circuit events.

Highlights

  • Automatic reset restores power without manual intervention
  • 50 A rating protects high-draw truck circuits reliably
  • 14 V DC design matches standard vehicle electrical systems
  • 5 kA interrupt capacity clears faults safely
  • SAE J553 compliance confirms automotive-grade construction

Specifications

BrandEATON BUSSMANN

Questions about this item

What size stud terminal does the CBC-50B use for ring-terminal connections?

The breaker uses a #10-32 stud terminal for ring-terminal connections.

How does the automatic-reset function behave after a trip, and what mistake do installers make?

It resets itself once the fault clears; the common error is skipping root-cause diagnosis because the breaker appears to work again.

Which spec tells me when the breaker itself may need replacement?

The 1.5 kA interrupt rating at 14 V DC defines the fault limit; repeated trips near that level can degrade the contacts and require replacement.

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