Shop Now for Relays - Circuit Breakers. Macomb Marine Parts handles an array of aftermarket boat repair parts such as Piranha Propellers, SEI Sterndrives and Relays - Circuit Breakers as well as original equipment marine repair parts by MerCruiser, OMC, Volvo Penta, Crusader, Pleasurecraft Marine, Chrysler, Chris Craft, Quick Silver, and Automatic Power Selectors. Shop Now for Great Deals on Relays - Circuit Breakers! For more information about a specific Relays or Circuit Breakers or another product please email us!