Blue Sea Systems 7139 187 Series DC Circuit Breaker - Surface Mount 50 Amp

The Blue Sea Systems 7139 is a 50-amp thermal DC circuit breaker from the 187 Series, designed for surface mount installation in marine and powersports applications. This switchable circuit breaker combines reliable overcurrent protection with convenient switching functionality in a single waterproof device.

Key Features:

• Combines switching and circuit protection into one device for simplified electrical panel design
• Trip-free design prevents the breaker from being held in the ON position during fault conditions
• Waterproof construction for reliable operation in harsh marine environments
• Ignition protected - meets SAE J1171 requirements for safe installation on gasoline-powered boats
• Large, clear single-lever operation with vertical/horizontal orientation for easy trip status indication
• Recessed mounting holes provide a clean, professional appearance
• Robust 5/16" terminal studs with ample clearance accept heavy gauge wire lugs and provide high torque connections

Technical Specifications:

• Amperage Rating: 50 Amps
• Circuit Breaker Class: Type III - Switchable/Manual Reset, Trip Free
• Breaker Type: Thermally responsive bi-metal blade
• Voltage Rating: 48 Volts DC Maximum
• Interrupt Rating: 5,000A @ 12V DC, 3,000A @ 24V DC, 1,500A @ 42V DC
• Case Material: Thermoset polyester
• Operating Temperature Range: -25°C to +82°C (-13°F to +180°F)
• Mounting Style: Surface mount

The 187 Series circuit breaker is ideal for protecting critical DC circuits in boats, RVs, and other marine or mobile applications where reliable overcurrent protection and convenient manual switching are required. The waterproof design and ignition protection make it particularly well-suited for marine electrical systems.