An overload relay is a protective device used in electrical circuits, particularly in motor-driven systems, to prevent the motor from drawing too much current, which can cause overheating and potential damage. When a motor or electrical equipment experiences an overload condition, the overload relay detects this and interrupts the power supply to prevent further damage. This type of relay is typically used in conjunction with a contactor, which controls the power to the motor. Overload relays are found in a wide range of applications, including manufacturing facilities, HVAC systems, and various other industrial environments.