Blue Sea 7043 90A 187-Series Panel Mount Breaker

The Blue Sea Systems 7043 is a 90 amp panel mount breaker in the 187 Series, rated to 48 volts DC.

Ninety amps falls between the 80 and 100 amp units, and its existence is the point rather than an accident. Cable ampacity depends on gauge, insulation temperature rating, and whether the run passes through an engine space. Those variables land on figures that no round-number breaker matches, and 90 covers one of them.

It suits a windlass, a small thruster or a sub-panel feed sized at 4 AWG in warmer conditions. The thermal bi-metal element tolerates the surge those motor loads draw at startup rather than tripping on it.

Interrupt capacity is 5,000 amperes at 12 volts DC, 3,000 at 24 and 1,500 at 42, in Type III class with manual reset and trip free operation. The round self-trimming case installs with a hole saw and needs no bezel, 5/16 studs take heavy gauge lugs, and it is waterproof and ignition protected to SAE J1171. Explore more marine circuit breakers.

• 90A, between the 80 and 100 amp units
• Ampacity varies with gauge, insulation and location
• For a windlass, small thruster or 4 AWG sub-panel
• Bi-metal tolerates motor startup surge