Why is current sensing important in electronic overload relays?

Current sensing is a critical feature in electronic overload relays because it directly monitors the current flowing to the motor or connected load. By continuously measuring the current, these relays can identify when the current exceeds predefined thresholds, which indicates that the motor is experiencing overload conditions.

When excessive current flows, it can lead to overheating, insulation failure, and eventually motor burnout. The relay's ability to sense this excess current allows it to act promptly, either by tripping the circuit or taking other protective measures to cut off power to the motor. This proactive capability is essential in preventing severe damage to both the motor and the connected equipment, extending their operational lifespan and reducing maintenance costs.

This focus on protecting the equipment is what makes current sensing a vital function of electronic overload relays, ensuring safe operation in various applications.