Blue Sea Systems 7139 187-Series 50 Amp Thermal Circuit Breaker for Marine and Automotive Applications

• 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

WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

The Blue Sea Systems 7139 187-Series thermal circuit breaker offers reliable circuit protection combined with convenient switching, making it ideal for marine and automotive use. With a 50 Amp capacity, this surface-mount breaker features a thermally responsive bi-metal blade that automatically trips during fault conditions, preventing damage to electrical systems. Its all-in-one design simplifies installation and maintenance by integrating circuit protection and switching into a single, compact device. The breaker’s case is constructed from durable thermoset polyester, ensuring long-term performance in harsh environments. It is rated for up to 48 volts DC and features an interrupt rating of 5,000 amperes at 12 volts DC, providing high fault current protection. The large, easy-to-operate lever allows for clear trip indication and can be oriented vertically or horizontally to suit installation preferences. Waterproof construction and recessed mounting holes contribute to a clean appearance and reliable operation in wet or rugged conditions. Large clearance around terminal studs accommodates heavy gauge wire lugs, and the robust 5/16-inch terminals ensure high torque connections, reducing the risk of loose wiring. All components meet SAE J1171 external ignition protection standards, making this circuit breaker safe for installation on gasoline-powered boats and other vehicles. Operating comfortably across temperatures from -25°C to +82°C, the Blue Sea 7139 circuit breaker combines safety, durability, and ease of use for demanding electrical applications. Its compact size and high-performance features make it a dependable choice for professional and DIY electrical systems where reliable circuit interruption is critical.

Features:

• Combines switching and circuit protection into a single device

• All components meet SAE J1171 external ignition protection requirements

• Clear, single lever operation for easy trip status indication

• Trip Free design prevents switching ON during fault conditions

• Waterproof construction ensures reliable operation in wet environments

• Recessed mounting holes provide a clean and secure installation

• Large clearance around terminal studs allows for heavy gauge wire lugs

• Robust 5/16-inch terminals enable high torque connections

• Large lever with vertical/horizontal orientation offers trip status indication

• Ignition protected for safe installation aboard gasoline-powered boats