Overload relays are critical components in electrical systems, especially when it comes to protecting motors from damage caused by excessive current or overheating. These relays play an essential role in ensuring the longevity of electrical devices and preventing catastrophic failures. In this article, we will explore the importance of overload relays, their working principles, applications, and types.
What is an Overload Relay? An overload relay is a protective device used in electrical circuits to monitor the current flowing through the system and disconnect the circuit when the current exceeds a predefined limit. Typically, it is employed to protect electric motors from running at excessively high currents, which could lead to overheating, degradation, or even failure. Overload relays are essential for both industrial and commercial applications, safeguarding equipment and ensuring operational efficiency. Working Principle of Overload Relays Overload relays primarily function by detecting the current drawn by the motor or system. These relays operate based on two main principles： thermal (heat) and electromagnetic (current sensing).
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