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Small plastic automotive circuit breaker with blade terminals

Bussmann

Bussmann CBF-20 Automotive Circuit Breaker 20 A 12V DC

SKU CH-2P5R-X8EKS

Plug-in 20 A circuit breaker protects 12 V DC truck circuits with a modified reset and glass-tube style housing

  • 20 A rating protects 12 V truck circuits
  • Glass tube design fits standard fuse blocks
  • Modified reset restores power after a fault
  • 1 kA interrupt capacity clears short circuits safely
  • RoHS compliant housing meets environmental standards

Application and Purpose

The Bussmann CBF-20 is a plug-in automotive circuit breaker rated at 20 A for 12 V DC systems. It suits trucks and other vehicles that use glass-tube fuse blocks and need a resettable alternative to a standard glass-tube fuse. The modified reset mechanism and plastic housing are built for surface-mount installations in automotive electrical panels.

Replacement and Upgrade

This breaker replaces a 20 A glass-tube fuse in compatible fuse blocks, providing a reusable protection device that avoids single-use fuse replacement. The jump is worth it when a circuit experiences occasional overloads that would otherwise blow fuses repeatedly, or when maintenance access makes fuse changes inconvenient. It is not suited for circuits requiring higher interrupt capacity than 1 kA at 12 V DC.

Installation and Common Issues

Installation consists of plugging the blade terminals into an existing glass-tube fuse block, requiring no tools or wiring changes. The surface-mount style and overall dimensions of 14 3/4 in depth, 7 1/2 in height, and 9 1/4 in width must match the available panel space. Common issues include selecting a breaker with the wrong current rating for the protected circuit or exceeding the 1 kA interrupt rating in a high-fault-current scenario.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

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

Will the 14 3/4 in depth fit my truck fuse block?

The breaker is 14 3/4 in deep, 9 1/4 in wide and 7 1/2 in high, so compare those dimensions with the space inside your fuse block before ordering.

How do I install the blade terminals without bending them?

Push the blade terminals straight into the glass-tube fuse block until they seat fully; the common mistake is angling the breaker, which can spread the blades and cause a loose connection.

When should I replace this 20 A breaker?

Replace it if it trips repeatedly at normal load, if the plastic housing shows heat damage, or if the blade terminals become corroded or loose in the fuse block.

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