Over the last year I've have 5 circuit breakers stop working. Today it
was the bilge blower. Cleaning the terminals didn't help. I've used Blue Sea Systems replacements, which are good
quality and have the white reset button with the rating number on them. The
photo below shows the effect of salt air on 12 year old electrical
components. I'm going to proactively replace all the critical
breakers when I get the time.