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Black plastic automotive circuit breaker with blade terminals, 30 A rating

Bussmann

Bussmann CB227-30 Automotive Circuit Breaker 30 A

SKU CH-4Q3C-QNGYR

A 30 A Type III plug-in circuit breaker with ATC footprint for 28 V DC automotive systems

  • Manual-reset protection for 30 A circuits
  • 28 V DC rating suits boat, bus, RV and truck systems
  • Type III ATC footprint plugs straight into standard fuse blocks
  • 2 kA interrupt capacity at 28 V DC handles heavy fault currents
  • Thermoplastic housing resists vibration and moisture in harsh environments

30 A Automotive Circuit Breaker

The Bussmann CB227-30 is a Type III ATC footprint circuit breaker rated for 30 A at 28 V DC. It serves boats, buses, RVs and trucks that need a resettable alternative to a standard blade fuse. The manual reset function lets the user restore power after an overload without replacing a fuse link.

Plug-In Mount with Blade Terminals

The breaker uses a surface-style plug-in mount that fits directly into an ATC fuse block, so installation requires no special tools or wiring changes. Blade terminals provide a secure connection that resists vibration in heavy-duty mobile applications. A thermoplastic housing insulates the contacts and withstands under-hood or bilge environments.

Replaces Standard ATC Blade Fuses

This device upgrades a single-use 30 A blade fuse to a manually resettable breaker, eliminating the need to carry spare fuses for repeated overloads. The jump is worth it when a circuit experiences occasional spikes that would otherwise blow a fuse and leave a critical system offline. It does not suit applications that require automatic cycling or a higher interrupt rating than 2 kA.

Highlights

  • Manual-reset protection for 30 A circuits
  • 28 V DC rating suits boat, bus, RV and truck systems
  • Type III ATC footprint plugs straight into standard fuse blocks
  • 2 kA interrupt capacity at 28 V DC handles heavy fault currents
  • Thermoplastic housing resists vibration and moisture in harsh environments

Specifications

BrandEATON BUSSMANN

Questions about this item

What voltage does the 28 V DC rating limit the breaker to?

The breaker is rated for 28 V DC systems and has a 2 kA interrupt capacity at that voltage.

What panel cut-out or footprint does the CB227-30 need?

It uses an ATC fuse footprint, so it fits the same rectangular blade slot as a standard ATC fuse.

How is the breaker installed and what step is often missed?

Push the blade terminals into the ATC fuse block until fully seated; the manual reset button will not latch if the breaker is not fully inserted.

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