What is the correct name for this breaker?

[Scott Danforth]

Would it matter in a simple 2 terminal breaker?

Yes. Even the small carling thermal breakers are labeled

 

[nola mike]

Yes. Even the small carling thermal breakers are labeled

Huh. That doesn't matter sense to me based on my knowledge of how they work. Looks like it's time to jump down a rabbit hole.

 

[Scott Danforth]

Notice the two colors of lugs on the small breakers.

The copper lug is the batt connection

 

[nola mike]

Notice the two colors of lugs on the small breakers.

The copper lug is the batt connection

I'm not doubting that the polarity exists, it's why. Fuses don't have that. My understanding is that breakers break either because a bimetallic strip heats and deforms breaking the connection or with an electromagnet that breaks when enough current is applied to the magnet to trip it (not sure how prevalent that is in a marine environment). In either case conceptually it doesn't make sense to me why it matters which wire is on which side of the circuit. I had a fuse on my lift that didn't blow until after the housing had melted some. Looking for a better solution so have been thinking about breakers more than normal I guess

 

[Scott Danforth]

I don't know why, I just know that they do.

 

[crazy charlie]

Guess I got the correct terminals by chance.Been out several times with no issues whatsoever. No markings anywhere and I looked with a magnifying glass to be sure.
All good ,cheap fix so let's see if it lasts. Tested it today and all good. Saw the exact same looking breaker selling in several places and probably all exactly the same but I bought the one that stated waterproof marine from an RV /Marine center. Charlie