Description
Blue Sea 7139 Thermal Circuit Breaker 50A | Boat Supply Store
Protecting critical electrical circuits on vessels operating in potentially hazardous atmospheric conditions, this breaker integrates a 50 Amp thermal circuit breaker with a manual reset switch into a single, ignition-protected unit. It offers a robust 5,000A @ 12V DC interrupt rating and meets SAE J1171 external ignition protection requirements, making it essential for gasoline-powered boats. Its thermoset polyester case and 5/16" terminals ensure durability and secure connections in demanding marine environments.
Key Features
- Integrated Switching and circuit protection in a single unit.
- Ignition Protected meeting SAE J1171 external ignition protection standards for safety.
- Trip Free Design preventing manual override of a tripped circuit.
- Waterproof Construction for reliable operation in the marine environment.
- Clear Lever Operation with vertical/horizontal orientation for easy trip status indication.
- Robust Terminals featuring 5/16" studs for secure heavy-gauge wire connections.
- Clean Installation with recessed mounting holes for a streamlined appearance.
- Versatile Voltage Support for 12V, 24V, or 42V DC systems up to 48V DC maximum.
Specifications
| Product Specifications | |
|---|---|
| Amp Rating | 50 Amp |
| Voltage Rating Maximum | 48V DC |
| Type | III (Switchable/Manual Reset/Trip Free) Thermal Circuit Breaker |
| Ignition Protection | SAE J1171 |
| Case Material | Thermoset Polyester |
| Terminal Size | 5/16" |
| Interrupt Rating @ 12V DC | 5,000A |
| Interrupt Rating @ 24V DC | 3,000A |
| Interrupt Rating @ 42V DC | 1,500A |
| Operating Temperature Range | -25°C to +82°C |
Who This Is For
Marine enthusiasts and boat owners requiring robust, integrated circuit protection and switching for 12V to 42V DC systems, especially on gasoline-powered vessels where SAE J1171 ignition protection is mandated. Marine electricians will appreciate its reliable performance and simplified installation.
How It Compares
| Feature | Blue Sea 7139 Thermal Circuit Breaker 50A | SAE J1171 |
|---|---|---|
| Amp Rating | 50 Amp | 40 Amp |
| Voltage Rating Maximum | 48 Volts DC | 48 Volts DC |
| Circuit Breaker Class | Type III - Switchable / Manual Reset - Trip Free | Type III - Switchable / Manual Reset - Trip Free |
| Ignition Protected | Yes (SAE J1171) | Yes |
| Interrupt Rating @ 12V DC | 5,000 Amperes | 4,000 Amperes |
| Interrupt Rating @ 24V DC | 3,000 Amperes | 2,400 Amperes |
Common Concerns Answered
Is this circuit breaker difficult to find in specific amperages?
While specific amperage ratings can sometimes experience supply chain constraints, the 50 Amp rating for the Blue Sea 7139 is a commonly requested and generally available option for robust marine electrical systems.
Is this breaker more expensive than simpler options?
The Blue Sea 7139 offers integrated switching and advanced features like ignition protection, which contributes to its price point compared to basic, non-switching circuit breakers. This unit provides a cost-effective solution by consolidating two components into one reliable package.
Do I need a separate switch if I only want circuit protection?
This unit combines both switching and circuit protection. If your application strictly requires only circuit protection without manual switching functionality, a simpler breaker without the integrated switch mechanism would be considered. However, this integrated design simplifies wiring and installation for many common marine applications.
Frequently Asked Questions
What is the voltage rating of the Blue Sea 7139 circuit breaker?
The Blue Sea 7139 187-Series circuit breaker has a maximum voltage rating of 48V DC.
What is the interrupt rating of the Blue Sea 7139 circuit breaker?
The interrupt ratings are 5,000A @ 12V DC, 3,000A @ 24V DC, and 1,500A @ 42V DC.
Is the Blue Sea 7139 circuit breaker ignition protected?
Yes, the Blue Sea 7139 circuit breaker meets SAE J1171 external ignition protection requirements.
What type of reset does the Blue Sea 7139 circuit breaker have?
The Blue Sea 7139 is a Type III thermal circuit breaker with a switchable function and manual reset capability. It also features a trip-free design.
Can the Blue Sea 7139 circuit breaker be used on gasoline-powered boats?
Absolutely. Its SAE J1171 ignition protection certification makes it safe and compliant for use on gasoline-powered vessels where ignition hazards exist.
