What happens to a circuit breaker when the current exceeds its predetermined value?

When the current in a circuit exceeds the predetermined value, the circuit breaker trips to break the circuit. Circuit breakers are designed as safety devices to prevent excessive current from flowing through an electrical circuit which can lead to overheating, equipment damage, or even fire. When the current surpasses the rated threshold, an internal mechanism within the circuit breaker is activated, physically disconnecting the circuit and stopping the flow of electricity. This action protects both the wiring and connected devices by interrupting the current and preventing potential hazards.

The automatic tripping mechanism is a fundamental feature of circuit breakers, ensuring that they serve their purpose effectively in safeguarding electrical systems. Once tripped, the circuit breaker may remain in the open position until manually reset, which can vary based on the design of the specific circuit breaker being used.