Blue Sea 7048 187 - Series Thermal Circuit Breaker - 150Amp

The Blue Sea 7048 187-Series Thermal Circuit Breaker—150 Amp is a marine-grade electrical protection device engineered for panel mounting on vessels where reliable overcurrent and fault-current protection is non-negotiable. This 150-amp thermal circuit breaker combines switching functionality and circuit protection in a single, compact unit, eliminating the need for separate components in tight electrical spaces aboard boats and marine installations.

The 187-Series design meets SAE J1171 external ignition protection requirements, a critical standard for marine environments where electrical faults can pose catastrophic safety risks. Its trip-free mechanism prevents the breaker from being held in the "ON" position during a fault-current condition, ensuring automatic disconnection when overcurrent is detected—a safety feature that protects both equipment and crew. The waterproof construction handles the corrosive marine environment, resisting salt spray and moisture that degrade conventional breakers. Single-lever operation provides intuitive, one-hand reset and switching without requiring tools or special procedures.

This breaker is ideal for anglers and boaters running larger electrical systems—particularly offshore vessels, cabin cruisers, and commercial fishing boats with substantial house loads or engine systems. The 150-amp rating handles high-draw applications such as thruster systems, large battery banks, main engine circuits, and multiple auxiliary systems without nuisance tripping. Weighing only 0.5 lbs and measuring 5 x 2 x 7 inches, it fits standard marine panel layouts without requiring extensive retrofit modifications.

Blue Sea Systems is recognized within the marine electrical industry for manufacturing US-built components that meet rigorous marine standards. The 187-Series thermal breaker is a proven choice for serious boaters who prioritize electrical reliability and safety compliance over budget alternatives.