Circuit Breakers Suppliers

Lose a circuit breaker on the main board, and the lights go out. Sometimes the propulsion goes with them. That's why the breaker is the one piece of switchgear that no one wants to skimp on. Every panel onboard, from the 6300A bus tie-down to the 6A lighting MCB, needs the right size, the right brand, and the right paperwork. Pick wrong, and the install takes twice as long. Pick really wrong, and the unit doesn't trip when it should.

Circuit breaker suppliers cover the full mix: newbuild orders for an entire switchboard, retrofit kits for a 25-year-old engine room, or a single ACB flown out to a vessel waiting at anchor. RecordsMarine lists reliable suppliers sorted by where they're active.

What's in the Category

Most of our listed vendors carry the standard split:

• ACB — air circuit breakers for main and emergency switchboards
• MCCB — molded case for distribution boards
• MCB — miniature breakers for lighting and small power
• RCD or RCCB for socket circuits in the accommodation
• MPCB for motor protection
• DC breakers for battery and emergency systems
• Vacuum breakers on HV ships (cruise, large offshore)

Frame sizes run small to huge. A panel breaker for a galley socket is one thing. A 4000A withdrawable ACB is another, and the lead time shows it.

Approvals and Paperwork

Don't take a breaker without the certificate pack. The base standard is IEC 60947-2. Type approval has to come from whichever class society is on your fleet — DNV, ABS, LR, BV, RINA, NK, KR, or CCS. IEC 60945 covers the environmental side: vibration, temperature, and salt mist. Anything for a hazardous zone needs ATEX or IECEx with the right gas group printed on the label, not just a product brochure.

What should land on the ship with the unit? Type approval, trip curve, factory test report, and a serial number that matches everything else. If the circuit breaker supplier shrugs when you ask, walk away.

Choosing Who to Buy From

Brand name matters more than people admit. ABB, Schneider, Siemens, Terasaki, Mitsubishi - each has a fleet that swears by it and another fleet that swears at it. Past that, look at:

• Stock at the ports your ships actually call
• Spares for older frames (this is where most vendors fall short)
• Trip unit options, fixed versus electronic
• Whether someone will fly out for the commissioning
• Real lead times, not the website lead times

Phone a fleet running the same brand for five years. They'll tell you which trip units drift and which don't.

What Breaks and What to Keep Onboard

Breakers age in three ways. Contacts wear. Trip units drift. Springs lose tension. Heat does most of the damage. Salt air finishes the job in a poorly sealed cabinet.

Spares worth keeping are: trip units for the main board, auxiliary contact blocks, shunt trip coils, operating handles, motor charging mechanisms, and a full arc chute set for any ACB. A dry dock overhaul should cover contact resistance and trip time tests.

FAQ

How fast can a circuit breaker supplier deliver?

Stock MCBs and MCCBs hit major ports in 3 to 7 days. Big frame ACBs and Ex-rated units take 4 to 12 weeks. Sometimes longer if the factory is on holiday.

What documents should ship with the unit?

Type approval, trip curve, factory test report, serial number. All four.

Can one vendor cover ACB through MCB?

The bigger providers do. Specialist shops focus on one segment — the directory profiles say which.

What about parts for older switchboards?

Some suppliers stock retrofit kits for obsolete frames. Worth asking up front.

Find a Circuit Breakers Supplier Near You

The directory below is sorted by region. Open a profile to see the brand list, approvals, and how to get hold of someone who actually answers the phone.