What is the purpose of overcurrent protection in switchgear?

The purpose of overcurrent protection in switchgear is to interrupt current flow exceeding predetermined limits. This is a crucial safety feature that helps protect electrical systems and equipment from damage due to excessive current, which can occur during fault conditions, overloads, or short circuits. When the current exceeds the set threshold, the protective device, such as a circuit breaker or fuse, operates to disconnect the circuit, thereby preventing overheating and potential equipment failure or fire hazards.

By effectively interrupting the flow of excess current, overcurrent protection maintains the integrity of the electrical system, minimizes the risk of damage, and ensures safe operation. This makes it a fundamental aspect of switchgear design, ensuring that the switchgear can handle unexpected increases in current while still protecting downstream components and maintaining a reliable power supply.