Overload relays are critical components used to protect electric motors from damage caused by excessive current or overload conditions. These devices serve an essential function in ensuring the safety and longevity of motors in various industrial and commercial applications. In this article, we will explore the purpose, operation, types, and applications of overload relays, highlighting their importance in motor protection.
What is an Overload Relay? An overload relay is a protective device designed to prevent electric motors from running under conditions that could lead to overheating and subsequent damage. When a motor draws more current than its rated value due to an overload, the relay senses this excess and automatically disconnects the motor from the power supply. This prevents the motor from burning out and ensures its safe operation. The primary purpose of an overload relay is to provide thermal protection to the motor. It is an essential part of a motor protection system, typically connected in series with the motor’s starter circuit. Overload relays work by detecting the current flowing through the motor and triggering a protective response when the current exceeds a predefined threshold.
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