Blue Sea Systems 187 Series Surface Mount Circuit Breaker

The Blue Sea Systems 187 Series surface mount circuit breaker is a marine-rated thermal DC breaker. It combines switching and circuit protection in one device, so you can use it as a manual disconnect and as an overcurrent protection device (breaker, circuit protector) on heavy-duty circuits. Do not use it as a switch where high inrush currents are expected.

Key Features:

• Single lever operation that is clear and easy to read, with a large lever that shows trip status in a vertical or horizontal orientation
• "Trip Free" design, so the breaker cannot be held on during a fault current condition
• Waterproof construction for the marine environment
• Ignition protected and safe for installation aboard gasoline-powered boats; meets SAE J1171 external ignition protection requirements
• Recessed mounting holes for a clean appearance
• Large clearance around the terminal studs accepts heavy-gauge wire lugs
• 5/16"-18 (M8) terminal studs for high-torque connections

Specifications (all models):

• Maximum voltage: 48V DC
• Mounting: surface mount; mounting holes accept #10 (M5) screws
• Breaker type: thermally responsive bi-metal blade
• Breaker class: Type III, switchable/manual reset, trip free
• Terminal stud torque: 75 in-lb (8.47 Nm)
• Case material: thermoset polyester
• Operating temperature: -40°C to 85°C

Use a cable lug with a 5/16" hole to connect. ABYC standards call for covering the terminals with a cable cap. This series is a good choice for boat battery, windlass, inverter and other high-current DC circuits where you want protection and switching in one device.