New Boat and Weird Circuit Breakers?

Ed, In the photo I sent in you can see the back side of my new boat’s main switch panel. I’m curious about the red blue and yellow plug in devices on the back of the panel. I’m assuming they are some sort of fuse or circuit breakers but am not really sure. Furthermore, I’ve tried to find some spare replacements and haven’t had much luck in my area. Any ideas on this? Ed, you’ve been really helpful in the past so I’m reaching out again. Thanks, Tom Tom, you’re in luck here. One of our ...