A Motor Overload Relay (MOR) is an essential component in electrical motor protection systems. It plays a critical role in safeguarding electric motors from damage caused by overcurrent conditions. Overloads, which occur when a motor draws more current than its rated capacity, can lead to overheating, decreased efficiency, and even motor failure. Therefore, the motor overload relay is indispensable in preventing such outcomes by providing automatic disconnection when current levels exceed the safe operating range. In this article, we will explore the function, importance, and applications of motor overload relays in various industries.
What is a Motor Overload Relay? A motor overload relay is a protective device designed to monitor the current flowing through an electric motor. Its primary function is to detect excessive current flow, typically caused by mechanical overload or blocked rotation, and disconnect the motor from the power supply to prevent permanent damage. The relay consists of a set of contacts that are triggered when the motor’s current exceeds a preset threshold for a specified period, activating a trip mechanism that cuts off power to the motor. Motor overload relays are commonly used with motors in HVAC systems, industrial machinery, pumps, conveyors, and other applications where electric motors are used to perform various tasks.
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