A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.

A moulded case circuit breaker (MCCB) is a type of electrical protection device that is used to protect the electrical circuit from excessive current, which can cause overload or short circuit.

A circuit breaker is a safety device to prevent damage to motors and wiring when the current flowing through the electrical circuit supersedes its design limits. It does this by removing the current from a circuit when an unsafe condition arises.

A circuit breaker is an electrical switch designed to automatically detect and eliminate short circuits and overloads. The trip unit is the “brain” of the circuit breaker. It measures physical parameters such as current and decides when to “trip” or rapidly open the circuit breaker.

The circuit breaker withstands the fault current momentarily & allows other circuit breakers to resolve the fault. The CB is designed to tolerate a specific range of fault current without damaging its terminals. Once it detects the fault current, it trips & interrupts the current flow.