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Small rectangular plastic automotive circuit breaker with blade terminals

Bussmann

Bussmann UCB-20 Automotive Circuit Breaker 20 A 12V

SKU CH-H5BE-R9Q43

Plug-in 12 V DC circuit breaker rated at 20 A with automatic reset for boats, buses, RVs and trucks

  • 20 A rating protects 12 V circuits from overload
  • Automatic reset restores power without manual replacement
  • Type I ATC design fits standard fuse blocks
  • RoHS compliant construction meets environmental standards
  • Suitable for boats, buses, RVs and trucks

Automotive Circuit Protection

The Bussmann UCB-20 is a Type I ATC circuit breaker rated at 20 A for 12V DC systems. It suits boats, buses, RVs and trucks needing automatic reset protection. The device plugs into compatible fuse blocks with recessed terminals. RoHS compliance confirms restricted substance limits.

Plug-In Mounting Simplicity

Installation requires pushing the blade terminals into a matching fuse block until seated. The surface-mount style needs no screws or special tools. A loose fit can cause overheating, so verify the block grips the blades firmly. The automatic reset function restores power after the fault clears.

Pre-Installation Verification

Confirm your vehicle runs a 12V DC electrical system before fitting. Check that the existing fuse block accepts ATC-style plug-in breakers with recessed terminals. Ensure the protected circuit draws no more than 20 A continuous current. Orders of $75 or more ship free from the supplier.

How it compares

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

Price $7.99
Cheaper than about 95% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameEATON BUSSMANN

Questions about this item

How can I confirm the UCB-20 is working after plugging it into my fuse block?

The breaker trips automatically when current exceeds 20 A and resets itself once the load drops back to normal; you will hear or feel the internal mechanism click during a trip event.

What comes in the box and do I need any extra parts to install it?

The package contains the single Type I ATC plug-in breaker; no additional hardware is required if your vehicle already has a compatible fuse block with recessed blade terminals.

Which current rating should I select for a 12 V DC accessory circuit?

Choose the 20 A version when the circuit’s normal draw is below 20 A and the wiring is rated for at least that current; the breaker is only offered in this single 20 A rating.

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