Blue Sea Systems 7138 187-Series 40Amp Thermal Circuit Breaker – Surface Mount, Waterproof, Trip Free

• 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 7138 187-Series thermal circuit breaker provides reliable circuit protection with a 40Amp capacity, designed for surface mounting applications. This switchable, manual reset circuit breaker combines switching and circuit protection into a single compact device, making it ideal for marine and other demanding environments. Its thermally responsive bi-metal blade ensures precise trip operation, protecting electrical systems from overloads and faults. Constructed with a durable thermoset polyester case, the breaker offers excellent resistance to harsh conditions, including water exposure and vibration, ensuring longevity in marine, RV, or industrial settings.
The breaker features large, heavy-duty terminal studs with 5/16-inch clearance, accommodating heavy gauge wire lugs for secure, high-torque connections. Its clear, large lever with vertical/horizontal orientation provides quick visual indication of trip status and allows easy operation, even in tight spaces. The waterproof design and recessed mounting holes contribute to a clean appearance and robust installation, while meeting SAE J1171 external ignition protection standards for safe installation aboard gasoline-powered boats. The breaker’s switchable design allows manual reset after tripping, ensuring continued protection without replacing components.
Operating within a temperature range of -25°C to +82°C, the Blue Sea Systems 7138 breaker supports a wide variety of operational environments. Its high interrupt ratings—up to 5,000 amperes at 12V DC—ensure reliable performance during fault conditions, safeguarding electrical circuits efficiently. With its rugged construction, ease of use, and compliance with safety standards, this circuit breaker is an essential component for marine, RV, and other mobile or industrial electrical systems seeking dependable overcurrent protection.

Features:

• Combines switching and circuit protection into a single device

• Meets SAE J1171 external ignition protection requirements

• Clear, single lever operation for quick control

• Trip Free design prevents holding ON during faults

• Waterproof construction for harsh environments

• Recessed mounting holes for a clean appearance

• Large clearance around terminal studs for heavy gauge wire lugs

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

• Large lever with vertical/horizontal orientation indicates trip status

• Ignition protected design safe for gasoline-powered boats