Relay voltage is a fundamental concept in the operation and application of relays within electrical control systems. A relay is an electromagnetic switch used to control electrical circuits, allowing a small electrical signal to control a larger one. It operates by using an electromagnet to physically move a set of contacts that either open or close a circuit. Understanding the different types of relay voltage—particularly the coil voltage and contact voltage—is essential for selecting the right relay for specific applications. In this article, we will delve into the importance of relay voltage, the differences between coil and contact voltage, and how to select the appropriate relay for your needs.
What is Relay Voltage? Relay voltage refers to the electrical voltages involved in the operation of a relay. A relay typically has two main voltage specifications: coil voltage and contact voltage. Coil Voltage: The coil voltage is the voltage that is applied to the relay’s coil (the electromagnet). This voltage is responsible for activating the relay and causing the internal mechanical contacts to either open or close, depending on the relay’s design. The coil voltage must be supplied to the relay for it to function properly. Common coil voltages range from 5V, 12V, and 24V to higher voltages such as 48V, 110V, and even 220V, depending on the application.
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