Circuit breaker with push-button reset only - 20 A

The BLUE SEA 7057-BSS 20-amp circuit breaker is designed to protect marine electrical circuits from overcurrents. It prevents damage to equipment and cables by interrupting the circuit in case of electrical overload or short circuit.

This circuit breaker is rated for a maximum current of 20 amperes. It is essential to ensure that the nominal current of the circuit being protected does not exceed this value to guarantee effective protection.

This is a thermal circuit breaker. It operates by detecting the heat generated by an overcurrent in the circuit, which triggers the protection mechanism.

This circuit breaker is designed to operate with marine electrical systems up to a maximum voltage of 32V DC (direct current).

After a trip caused by an overload, simply press the reset pushbutton located on the circuit breaker. Before resetting, it is advisable to check the cause of the trip to prevent it from occurring again immediately.

The main difference is that this circuit breaker is resettable. After tripping, it can be manually reset using its push-button, eliminating the need to replace a consumable component like a fuse. A fuse, once blown, must be replaced.

Yes, this circuit breaker is specifically designed by BLUE SEA Systems for marine applications. It is resistant to harsh marine conditions, including humidity and salt spray, and complies with relevant maritime standards.

Yes, this circuit breaker complies with SAE J1171, meaning it is ignition protected. This feature is critical for installations in engine compartments where flammable vapors may pose a risk.

It is ideal for protecting secondary circuits and individual equipment requiring protection up to 20 amperes. This includes, for example, lighting circuits, small to medium bilge pumps, fans, isolated navigation equipment, or other auxiliary accessories.

This circuit breaker uses Faston 0.250" (6.35mm) quick-connect terminals. Simply insert the corresponding cable lugs into the breaker's terminals to establish the connection.

It is imperative to use cables of appropriate cross-section for a 20-amp circuit to avoid overheating. The cable cross-section depends on the circuit length and the allowable voltage drop, but for 20A, 12 AWG cables (approximately 3.3 mm²) or larger are generally recommended for common marine applications.

Yes, this circuit breaker is compatible with electrical systems operating at 12V DC and 24V DC, as well as other DC voltages up to a maximum of 32V DC.

No, this 20-amp circuit breaker is not suitable for protecting a starter motor. Starter motors require very high-current circuit breakers (often several hundred amperes) designed to handle high inrush currents. This breaker is intended for low- and medium-power auxiliary circuits.

Although primarily designed for marine use, its specifications (32V DC, 20A, ignition protection) make it potentially suitable for certain automotive or recreational vehicle (RV) applications requiring similar circuit protection, particularly where resistance to moisture is an advantage. It is always recommended to verify specifications and application-specific standards.

Yes, this circuit breaker can replace a 20 ampere fuse in a DC circuit, provided the circuit's maximum voltage (up to 32V DC) and the breaker's interrupting rating are suitable for the application. The advantage is that it is resettable, avoiding the need to replace the fuse.

The BLUE SEA 7057-BSS circuit breaker is designed to protect marine electrical circuits from overcurrents. It acts as a safety device that interrupts the current flow when it detects an overload or short circuit, preventing damage to equipment and cables. Unlike a fuse, it can be manually reset after the issue is resolved, eliminating the need to replace consumables.

This circuit breaker features quick-connect terminals (typically fork terminals or 'spade terminals') that simplify integration into electrical systems. It is designed for panel mounting. Installation involves connecting the power and load cables to the appropriate breaker terminals. It is recommended to ensure wiring complies with marine standards and that wire gauge is suitable for the 20-amp rating for optimal safety.

Yes, this BLUE SEA thermal circuit breaker is compatible with DC marine electrical systems, typically 12V, 24V or even 32V DC. It is specifically designed for protecting auxiliary circuits and low to medium power equipment in a marine environment.

The 'trip-free push-button reset' function means the circuit breaker trips automatically when an overcurrent or short circuit is detected, thereby cutting off the circuit. Once the cause of the trip has been identified and corrected, the user can manually reset the breaker by pressing its button. There is no lever to manually activate or deactivate it before a trip; its function is purely protective and reset after an event.

This 20-amp circuit breaker is ideal for protecting secondary circuits and individual equipment requiring up to 20A protection. It is particularly suitable for:

Auxiliary circuitsBilge lightingIsolated navigation equipmentSmall to medium power bilge pumpsAccessory power outletsIts compact design allows installation in tight spaces, and its fast reset capability makes it a practical alternative to traditional fuse holders for these applications.