Circuit Breakers

Circuit breakers protect wiring from overcurrent and double as a switch to isolate a circuit for service. This collection includes surface mount marine circuit breakers from 20A to 150A, panel mount breakers, 150V DIN rail breakers for solar systems, back-mount DC breakers for Magnum panels, Mini Magnum MMP panels, the MidNite Solar Babybox, the Schneider XW power distribution panel, and 30A and 50A automatic transfer switches for switching between shore and inverter power.

How to choose a marine circuit breaker

• Current rating: size the breaker to protect the wire, not just the load.
• AC or DC and voltage: use DC-rated breakers for battery and solar circuits and check the maximum voltage.
• Mounting: surface, panel or DIN rail, depending on where it will be installed.
• Interrupt capacity: large battery banks can deliver very high fault currents; check the rating.

Fuse or circuit breaker?

A breaker can be reset and used as a switch; a fuse is smaller and simpler. Both are common on boats. See marine fuses.

Do I need a transfer switch with an inverter?

If the inverter does not have an internal transfer relay, a transfer switch selects shore or inverter power safely. See our marine inverters.