An overload relay is a device designed to protect an electric motor from damage due to overload or excessive current. It plays an important role in ensuring smooth and safe operation in various applications including industrial processes, elevators, escalators and more.

The overload relay works by monitoring the current flow to the motor and shuts it off when it detects a high current flow that could damage the motor. This protects the engine from overheating, which could cause failure and potentially serious damage to equipment or even pose a safety hazard to personnel.