Relays are essential components in electrical circuits, used to control the flow of current by opening and closing contacts. One of the most critical specifications of a relay is its voltage rating, which defines the voltage that the relay can handle safely without causing damage to the relay or the circuit. Understanding relay voltage ratings is essential to ensure the safe and efficient operation of electrical systems. This article will explore the different aspects of relay voltage ratings, including their significance, types, and key considerations when choosing a relay for a specific application.

What is Relay Voltage Rating? Relay voltage rating refers to the maximum voltage that a relay can handle across its coil and contacts. There are two primary voltage ratings that need to be considered when selecting a relay： Coil Voltage Rating： This is the voltage required to energize the relay coil, creating a magnetic field that pulls the contacts together (or separates them, depending on the relay design). The coil voltage rating ensures that the relay will operate correctly when the correct voltage is applied. This voltage is typically specified as either AC or DC, depending on the type of relay.