Description
Blue Sea 7143 90A Thermal Circuit Breaker | Boat Supply Store
This 90-amp thermal circuit breaker provides essential overcurrent protection and manual switching for 12V, 24V, or 42V DC systems, critical for gasoline-powered vessels requiring SAE J1171 external ignition protection. Its thermally responsive bi-metal blade design ensures reliable operation within a wide temperature range of -25°C to +82°C. With a high interrupt rating of 5000A at 12V DC, it offers robust protection against fault conditions.
Key Features
- Integrated Switching Combines essential circuit protection with on/off functionality.
- Ignition Protected Meets SAE J1171 standards, crucial for safe operation in gasoline-powered engine spaces.
- Trip Free Design Prevents manual or forced closing of a circuit while it is overloaded.
- Waterproof Construction Ensures reliable performance in harsh marine environments.
- Clear Lever Operation Single lever offers intuitive control and distinct visual trip indication.
- Robust Terminals Features large 5/16" studs for secure connection of heavy gauge wiring.
- Simplified Installation Reduces wiring complexity by consolidating two components into one.
- Versatile Voltage Support Suitable for 12V, 24V, and 42V DC systems.
Specifications
| Product Specifications | |
|---|---|
| Amp Rating | 90 Amp |
| DC Max Voltage | 48V DC |
| Type | Type III (Switchable/Manual Reset/Trip Free) Thermally Responsive Bi-Metal Blade |
| Ignition Protection | SAE J1171 |
| Interrupt Rating @ 12V DC | 5000A |
| Interrupt Rating @ 24V DC | 3000A |
| Interrupt Rating @ 42V DC | 1500A |
| Operating Temperature | -25°C to +82°C |
| Case Material | Thermoset Polyester |
| Terminal Stud Size | 5/16" |
Who This Is For
Marine electricians and boat builders requiring reliable, ignition-protected circuit protection and switching for 12V, 24V, or 42V DC systems up to 90 amps. Also ideal for boat owners upgrading or installing electrical systems on gasoline-powered vessels.
How It Compares
| Feature | Blue Sea 7143 90A Thermal Circuit Breaker | Blue Sea Systems 7144 187 |
|---|---|---|
| Amp Rating | 90 Amp | 100 Amp, 90 Amp |
| Voltage Rating | 48 Volts DC Maximum | 48 Volts DC Maximum, 12-32 Volts DC |
| Interrupt Rating (12V DC) | 5,000 Amperes | 5,000 Amperes, 2,500 Amperes |
| Ignition Protected | Yes | Yes, Yes |
| Type | Type III - Switchable / Manual Reset - Trip Free | Type III - Switchable / Manual Reset - Trip Free, Thermal |
Common Concerns Answered
Why is this circuit breaker more expensive than basic models?
The Blue Sea 7143 offers integrated switching and robust ignition protection compliant with SAE J1171, features not found in basic breakers. This consolidation of components and adherence to critical safety standards justifies the investment for reliable and safe marine electrical systems.
What do the different interrupt ratings mean?
The interrupt rating signifies the maximum fault current the breaker can safely interrupt. The Blue Sea 7143 provides 5000A at 12V DC, 3000A at 24V DC, and 1500A at 42V DC, indicating its capability to protect against high fault currents at various system voltages common in marine applications.
Can I use this on a boat with a gasoline engine?
Yes, absolutely. The Blue Sea 7143 is SAE J1171 external ignition protection compliant, making it safe for use on vessels with gasoline engines where ignition sources must be controlled to prevent accidental combustion.
Frequently Asked Questions
What is the voltage rating of the Blue Sea 7143 circuit breaker?
The Blue Sea 7143 circuit breaker has a maximum voltage rating of 48V DC.
What is the interrupt rating of the Blue Sea 7143 circuit breaker?
The interrupt rating varies by voltage: 5000A at 12V DC, 3000A at 24V DC, and 1500A at 42V DC.
Is the Blue Sea 7143 circuit breaker ignition protected?
Yes, the Blue Sea 7143 is ignition protected and meets the SAE J1171 external ignition protection standard.
What type of circuit breaker is the Blue Sea 7143?
The Blue Sea 7143 is a Type III thermal circuit breaker, featuring switchable functionality, manual reset, and a trip-free design.
Can the Blue Sea 7143 be used on gasoline-powered boats?
Yes, due to its SAE J1171 ignition protection compliance, it is specifically designed and safe for use on gasoline-powered boats.
