Blue Sea 7148 187 - Series Thermal Circuit Breaker - 150Amp

The Blue Sea 7148 187-Series Thermal Circuit Breaker is purpose-built for marine electrical systems where reliable overcurrent protection is non-negotiable. If you've logged time on the water—whether running a center console, cruising offshore, or managing a fishing vessel's complex power distribution—you know that electrical failures don't announce themselves.

This 150-amp breaker serves as the backbone of modern boat wiring, protecting your engine, navigation systems, and auxiliary loads from dangerous surges and short circuits that could strand you offshore or worse. It's engineered for the unpredictable demands of saltwater and freshwater environments. Blue Sea Systems' thermal technology uses a bimetal strip that responds to sustained overcurrent by bending and mechanically tripping the breaker—no electronics required, no false triggers from momentary load spikes.

The thermal mechanism is inherently self-resetting once the overload clears—ideal for remote installations where manual access is limited. Weighing just 0.55 lbs and measuring 5 x 2 x 8 inches, it installs compactly without sacrificing the robust construction that keeps working boats running. Experienced boat operators and marine electricians specify Blue Sea breakers because they're proven under extreme conditions.