What is the correct name for this breaker?

[crazy charlie]

I may have to replace this...whats it called? Everything fine when winterized.Now my Yamaha OX66 on my Grady starts and tilts fine but nothing else is working.Is this a main breaker?? Resettable or replace?? Puzzled . Charlie

 

[alldodge]

I would use a meter to see if power is not passing before replacing

It's most likely just a standard push button breaker under the cover
https://inverterservicecenter.com/40-amp-medium-duty-push-button-circuit-breaker-blue-sea-2141

 

[dingbat]

That is the circuit breaker for the main power of the boat. Trim power comes off the motor side.

Pretty robust. Have not had an issue with mine. Pull the two screws on the transom and put a meter across the terminals on the back.