Mercury - Quicksilver 50 Amp Circuit Breaker Electrical System Stainless Steel 11178A01. Overview. You know that sense of relief when you turn the key and everything just wakes up the way it should - lights on, gauges steady, power ready? That's what a solid electrical system gives you, and the Mercury Marine 11178A01 Quicksilver 50 Amp Circuit Breaker is right at the heart of it. It's not the kind of part most boaters talk about, but when you've spent enough time on the water, you know it's the