187 - Series Thermal Circuit Breakers - Surface Mount - 150 Amp Circuit Breaker. Combines switching and circuit protection into a single device, All components meet SAE J1171 external ignition protection requirements, Clear, single lever operation. "Trip Free" design cannot be held "ON" during fault current condition, Waterproof, Recessed mounting holes for clean appearance. Large clearance around terminal studs accept heavy gauge wire lugs, Robust 5/16 terminals provide high torque connections, Large lever with vertical/horizontal orientation provides indication of trip status, Ignition protected - safe for installation aboard gasoline powered boats. Circuit Breaker Class: Type III - Switchable / Manual Reset - Trip Free, Thermally Responsive Bi-Metal Blade, Case Material of Thermoset Polyester. Voltage Rating of 48 Volts DC Maximum. Interrupt Rating: 5,000 Amperes @12 Volts DC, 3,000 Amperes @24 Volts DC, 1,500 Amperes @42 Volts DC.