A relay is an essential component in electrical and electronic systems, widely used for switching applications. It allows a low-power electrical signal to control a higher power circuit, effectively acting as a “switch” that opens or closes based on the input signal. One of the critical factors that influence the functioning of relays is relay current, which plays a significant role in ensuring the reliability and efficiency of relay-based systems. In this article, we will delve into the concept of relay current, its significance, and its various applications.
What is Relay Current? Relay current refers to the amount of electric current that flows through the relay coil when it is activated. The coil is the most crucial part of the relay that generates a magnetic field when current passes through it, which, in turn, causes the relay’s contacts to open or close, depending on the relay’s design. Essentially, the relay current determines whether the relay operates as intended, activating or deactivating the circuit it controls. There are two primary types of relay current: the operating current and the holding current. The operating current is the current required to initially activate the relay and switch the contacts. The holding current, on the other hand, is the current required to keep the relay in its activated state once it has been switched on.
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