Relays are essential components in electrical systems, serving as electrically operated switches. They are used to control a variety of circuits by providing isolation between different parts of an electrical system. One of the key aspects of selecting the right relay is understanding its voltage rating. A relay’s voltage rating determines the amount of voltage it can safely handle across its contacts, which is crucial for both safety and functionality.

    The voltage rating of a relay is typically split into two categories: the coil voltage and the contact voltage. The coil voltage refers to the voltage needed to energize the relay’s coil and actuate the switch, while the contact voltage refers to the maximum voltage that can be applied across the relay's contacts without causing damage or malfunction. Both of these voltage ratings are critical in ensuring the relay operates correctly within a given system.