What happens when the trip unit detects an overcurrent in a circuit breaker?

When the trip unit detects an overcurrent in a circuit breaker, it activates a mechanism that releases or unlatches the contacts of the circuit breaker. This action interrupts the electrical flow, effectively protecting the circuit from potential damage due to excessive current. The trip unit is designed to monitor the current flowing through the circuit and respond to conditions that could lead to overheating or electrical fires by breaking the circuit when the current exceeds a predefined threshold. By opening the contacts, it ensures the safety of the electrical system, preventing equipment damage or hazardous situations from occurring.