What is a circuit breaker?

By：Nader Updated：August 17,2020 16:23PM

1. What is a circuit breaker?

A circuit breaker is a switching device that interrupts the abnormal or fault current, such as Overload, over-current, short circuit. It is a mechanical device that disturbs the flow of high magnitude current and in additions performs the function of a switch. The circuit breaker is mainly designed for closing or opening of an electrical circuit, thus protects the electrical system from damage.

Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset to resume normal operation by either manually or automatically.

Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliance, up to large switchgear designed to protect high voltage circuits feeding a whole country.

2. What does a circuit breaker do?

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. A circuit breaker can be reset to resume normal operation by either manually or automatically.

3. What happens when a circuit breaker trips?

The circuit breaker will trip when too much electricity flows through it or when it can’t handle the excess current load, such as short circuit. This means that the flow of electricity is cut off to keep your circuits from overheating or causing more damage.

4. Where would you use a circuit breaker?

As long as there is electricity safety requirement, there is a circuit breaker. Circuit breaker is a safety device used to protect your electrical appliances at home or at industry in case of short circuit or any other cause for excessive current. It has replaced the fuses from the earlier times. Whenever there is excess current in the circuit beyond the max rating, the breaker will trip.

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