Description
Blue Sea 7047 Thermal Circuit Breaker 135A | Boat Supply Store
Protecting critical electrical circuits on 12V, 24V, or 42V DC systems, this 135 Amp thermal circuit breaker integrates a robust switch with a trip-free mechanism and manual reset capability. Engineered for extreme marine environments, it features SAE J1171 external ignition protection and a waterproof casing, making it ideal for gasoline-powered vessels where fire safety is paramount. With a substantial 5000A @ 12V DC interrupt rating, it ensures reliable protection for demanding loads.
Key Features
- Combines switching and circuit protection in one unit
- Meets SAE J1171 external ignition protection standards
- Provides clear, single-lever operation for status and reset
- Ensures trip-free functionality to prevent re-engagement during fault
- Offers complete waterproofing for wet environments
- Facilitates easy installation with recessed mounting holes and self-trimming case
- Accommodates large clearance around 5/16" terminal studs
- Delivers reliable performance with a 135 Amp rating
Specifications
| Product Specifications | |
|---|---|
| Amp Rating | 135 Amp |
| Maximum Voltage Rating | 48V DC |
| Type | Type III (Switchable/Manual Reset/Trip Free) |
| Ignition Protected | SAE J1171 |
| Waterproof | Yes |
| Interrupt Rating @ 12V DC | 5000A |
Who This Is For
Marine enthusiasts and boat owners requiring integrated switching and circuit protection for 12V, 24V, or 42V DC systems. Essential for gasoline-powered vessels where SAE J1171 ignition protection is critical.
How It Compares
| Feature | Blue Sea 7047 Thermal Circuit Breaker 135A | Blue Sea Systems 7046 187 |
|---|---|---|
| Amp Rating | 135 Amp | 100 Amp, 150 Amp |
| Maximum Voltage Rating | 48 Volts DC | 48 Volts DC, 28 Volts DC |
| Interrupt Rating @ 12V DC | 5,000 Amperes | 5,000 Amperes, 2,500 Amperes |
| Ignition Protected | Yes | Yes, Yes |
| Switch Function | Yes | Yes, Yes |
Common Concerns Answered
What if the breaker trips too often?
Nuisance tripping typically indicates an amperage selection that is too low for the circuit load or an underlying electrical fault. Verify that the 135 Amp rating is appropriate for the protected equipment and inspect wiring for any anomalies. This breaker's trip-free design ensures it won't re-engage during a fault condition.
Is this difficult to install on my boat?
Installation requires a foundational understanding of DC electrical systems and wire sizing. While panel mounting and wiring are straightforward due to the round case and ample terminal clearance, proper circuit load calculation and safety protocols are critical for optimal performance and safety.
Why is this breaker more expensive than simpler alternatives?
The higher cost reflects its advanced features, including integrated switching, SAE J1171 ignition protection, waterproof construction, and a trip-free mechanism, providing superior safety and reliability, especially on gasoline-powered vessels, compared to basic, non-switchable breakers.
Frequently Asked Questions
What is the voltage rating of the Blue Sea 7047 circuit breaker?
The Blue Sea 7047 is rated for a maximum of 48 Volts DC.
What is the interrupt rating of the Blue Sea 7047 circuit breaker?
The interrupt rating for the Blue Sea 7047 is 5,000 Amperes at 12 Volts DC.
Is the Blue Sea 7047 circuit breaker ignition protected?
Yes, the Blue Sea 7047 is SAE J1171 external ignition protected, making it suitable for use in gasoline-powered engine compartments.
What type of circuit breaker is the Blue Sea 7047?
The Blue Sea 7047 is a Type III thermal circuit breaker, featuring switchable functionality, manual reset, and a trip-free design.
Can the Blue Sea 7047 be used on gasoline-powered boats?
Yes, the Blue Sea 7047 is specifically designed with SAE J1171 external ignition protection, making it safe for use on gasoline-powered boats where ignition hazards exist.
