What is citcuit breaker
A circuit breaker is an electrical device designed to protect an electrical circuit from damage caused by an overload or short circuit. It is a safety device that automatically interrupts the flow of electric current in a circuit when it exceeds a certain level, preventing damage to the circuit or equipment connected to it.
Circuit breakers are commonly used in electrical power distribution systems to:
- Protect against overcurrent: When a circuit is overloaded or has a short circuit, the breaker trips (opens) to prevent damage to the circuit or equipment.
- Prevent electrical fires: By interrupting the flow of current, circuit breakers can prevent electrical fires caused by overheating or arcing.
- Reduce downtime: Circuit breakers can quickly and automatically disconnect the power supply, minimizing downtime and reducing the risk of equipment damage.
Types of circuit breakers:
- Molded case circuit breakers (MCCBs): These are the most common type, used in residential and commercial applications.
- Air circuit breakers (ACBs): These are used in industrial and commercial applications, often in high-voltage systems.
- Miniature circuit breakers (MCBs): These are smaller, used in residential and commercial applications, often in smaller circuits.
- Ground fault circuit breakers (GFCBs): These detect ground faults (leaks to ground) and trip to prevent electrical shock.
Circuit breakers typically have the following features:
- Trip mechanism: A mechanism that detects overcurrent and trips the breaker.
- Reset mechanism: A mechanism that allows the breaker to be reset after a trip.
- Contacts: The electrical contacts that make and break the circuit.
- Arc chute: A device that helps extinguish the arc created when the breaker trips.
In summary, circuit breakers are essential safety devices that protect electrical circuits from damage and prevent electrical fires, while also reducing downtime and equipment damage.