What is the main role of the fuse in the electrical power supply circuit?

The main role of the fuse in an electrical power supply circuit is to protect against overcurrent conditions. A fuse is a safety device designed to interrupt the flow of electricity when the current exceeds a certain threshold, which can occur due to faults, overloads, or short circuits. By breaking the circuit, the fuse prevents excessive current from causing damage to electrical components, reducing the risk of electrical fires and equipment failure.

This protective mechanism is critical in maintaining the safety and integrity of electrical systems. When normal operation resumes, and the current returns to within safe levels, the circuit remains protected against future overcurrent conditions until the fuse is replaced. Overall, the fuse serves as a vital component in ensuring the safety and longevity of electrical appliances and installations.