Description
Blue Sea 7543 C-Series 20A Circuit Breaker | Boat Supply Store
This Blue Sea Systems C-Series circuit breaker safeguards critical marine electrical systems against overcurrent events, ensuring operational integrity for high-demand equipment. It features a magnetic hydraulic, trip-free mechanism with a substantial 3000A interrupt capacity at 120V AC and is ignition protected to SAE J1171 standards for safe installation on gasoline-powered vessels. Ideal for controlling and protecting circuits for inverters, bow thrusters, or windlasses, it provides both switching and reliable overcurrent protection up to 240V AC or 48V DC.
Key Features
- Combines switching and circuit protection in one unit.
- Trip-free mechanism prevents holding closed after a fault.
- Ignition protected per SAE J1171 for safe use on gasoline vessels.
- Flat rocker actuator with flush 'ON' position prevents accidental switching.
- Visual 'OFF' indication via a colored actuator.
- Robust C-Series design for demanding marine environments.
- Single pole configuration for 20A AC/DC circuits.
- Wide operating temperature range from -40°C to 85°C.
Specifications
| Product Specifications | |
|---|---|
| Poles | Single |
| Amperage Rating | 20A AC/DC |
| Maximum Voltage (AC) | 240V AC |
| Maximum Voltage (DC) | 48V DC |
| Interrupt Capacity (AC) | 3000A @ 120V AC / 3500A @ 240V AC |
| Interrupt Capacity (DC) | 5000A @ 32V DC |
| Actuator Style | Flat Rocker |
| Mechanism | Magnetic Hydraulic, Trip-Free |
| Ignition Protected | Yes (SAE J1171) |
| Operating Temperature | -40°C to 85°C |
Who This Is For
Marine electricians and boat owners require dependable circuit protection and integrated switching for high-load DC and AC circuits. Boat builders utilize this unit to meet stringent safety standards and ensure reliable electrical system functionality.
How It Compares
| Feature | Blue Sea 7543 C-Series 20A Circuit Breaker | Blue Sea Systems 7421 M |
|---|---|---|
| Amperage | 20A AC / 20A DC | 20A, 20A |
| Poles | 1 | 1, 1 |
| Maximum Voltage (AC) | 240V AC | 240V AC, null |
| Maximum Voltage (DC) | 48V DC | 48V DC, 28V DC |
| Actuator Style | Flat Rocker | Contura Rocker, Push-button reset |
| Integrated Switching | Yes | Yes, No |
| Ignition Protected | Yes | Yes, Yes |
Common Concerns Answered
Some users mentioned difficulty mounting. How can I ensure a proper fit?
While some users report panel thickness limitations, the Blue Sea 7543 is designed for standard marine panel installations. Ensure your panel's cutout dimensions and thickness align with the breaker's specifications for a secure fit. Consult the manual for detailed mounting instructions and recommended panel thicknesses.
I prefer a more tactile switch. Does this breaker offer sufficient feedback?
The flat rocker actuator is designed for flush mounting and to prevent accidental activation. While it offers a distinct 'ON' and 'OFF' visual cue, the tactile feedback may be less pronounced than a deeply contoured rocker. The primary benefits are its low profile and clear visual indication.
Is this breaker suitable for gasoline-powered boats?
Absolutely. The Blue Sea 7543 is ignition protected to SAE J1171 standards, meaning its construction prevents it from igniting flammable surrounding vapors, making it safe for use in engine compartments of gasoline-powered vessels.
Frequently Asked Questions
What is the maximum voltage rating for the Blue Sea 7543 circuit breaker?
The maximum voltage rating for the Blue Sea 7543 circuit breaker is 240V AC or 48V DC.
What is the interrupt capacity of this circuit breaker?
The interrupt capacity is 3000A at 120V AC, 3500A at 240V AC, and 5000A at 32V DC.
Is this circuit breaker ignition protected?
Yes, the Blue Sea 7543 is ignition protected, meeting the SAE J1171 standard, making it safe for use on gasoline-powered boats.
What type of actuator does the Blue Sea 7543 have?
The Blue Sea 7543 features a flat rocker actuator with a flush 'ON' position to prevent accidental switching.
What is the purpose of the colored actuator on this breaker?
The colored actuator serves as a visual indicator, clearly displaying the 'OFF' position of the circuit breaker, aiding in quick identification and safe operation.
