• Marine Rated Circuit Breaker - 20A 32V DC (Ignition Protected) - CB255-20
  • Marine Rated Circuit Breaker - 20A 32V DC (Ignition Protected) - CB255-20
  • Marine Rated Circuit Breaker - 20A 32V DC (Ignition Protected) - CB255-20
1 3

JAS Oceania - CB255-40

Marine Rated Circuit Breaker - 40A 32V DC (Ignition Protected) - CB255-40

Ideal for protecting high-load 12V and 24V DC circuits in marine, caravan, 4WD, and automotive electrical systems requiring reliable 40A overcurrent protection.

$89.95 AUD
$89.95 AUD
Sale
Tax included. Shipping calculated at checkout.
  • Genuine Eaton Bussmann marine-rated protection
  • Ignition protected for safe installation in engine compartments
  • Weatherproof housing built for harsh environments
  • Resettable design eliminates fuse replacement downtime

The Eaton CB255-40 is a Bussmann Series marine-rated circuit breaker designed to deliver dependable 40 amp overcurrent protection in 12V and 24V DC systems. Rated up to 32V DC, this compact, low-profile breaker is engineered for demanding marine, caravan, and automotive environments where safety and durability are critical.

With Type III ignition protection and weatherproof construction, the CB255-40 is suitable for installation in engine compartments and exposed areas where vibration, moisture, and harsh conditions are common. The manual reset mechanism includes a push-to-trip function, allowing easy fault testing and reset without replacing a fuse after an overload event.

Supplied with SEMS nuts pre-installed and built for panel mounting, the CB255-40 offers a secure, professional installation solution for protecting higher-current DC circuits in boats, 4WDs, caravans, and off-grid electrical systems.

Key Features

  • 40A marine-rated circuit breaker
  • Rated to 32V DC
  • Type III ignition protected
  • Weatherproof housing
  • Low-profile compact design
  • Manual reset with push-to-trip function
  • Panel mount installation
  • SEMS nuts installed

Specifications

Brand Eaton (Bussmann Series)
Model CB255-40
Product Type Marine rated circuit breaker
Amperage Rating 40A
Voltage Rating 32V DC
Ignition Protection Type III
Protection Weatherproof
Reset Type Manual reset (push-to-trip)
Mounting Method Panel mount
Product Length 1.42 in
Product Height 2.15 in
Product Width 1.6 in
Product Weight 0.9 lb
Compliance RoHS Compliant

What does "marine rated" mean?

Marine rated means the circuit breaker is designed to operate reliably in environments exposed to moisture, vibration, and temperature variation. It features weather-resistant construction suitable for boats, caravans, and 4WD applications.

What does "Type III ignition protected" mean?

Type III ignition protection means the breaker is designed to prevent sparks or arcs from igniting flammable vapours. This makes it suitable for installation in engine compartments and marine environments where fuel vapours may be present.

Is this a manual reset breaker?

Yes. The CB255 series is a manual reset breaker with a push-to-trip function. Once it trips due to an overload, it must be manually reset after the fault is cleared.

Can this replace a fuse?

Yes. A resettable circuit breaker like the CB255 can replace a fuse of the same amperage rating. It provides overcurrent protection without requiring fuse replacement after a trip.

Can this be used in 12V and 24V systems?

Yes. The CB255 series is rated up to 32V DC, making it suitable for both 12V and 24V DC systems.

How do I choose the correct amp rating?

Select a breaker rated slightly above the normal operating current of the circuit, but below the maximum current rating of the cable. Always match protection to cable size.

View full details

Recent articles

View all