Relays are essential components in many electrical systems, acting as switches that allow for the control of electrical circuits. These devices utilize an electromagnet to control the switching of contacts, making them pivotal in automation, safety, and control systems. One of the most crucial aspects of a relay’s operation is the relay voltage, which refers to the voltage required to activate the relay’s electromagnetic coil and ensure its proper functioning. In this article, we will explore the concept of relay voltage, its importance, and factors to consider when selecting a relay for specific applications.

What is Relay Voltage? Relay voltage refers to the voltage required to operate the coil inside the relay, which is responsible for activating the relay’s switching mechanism. When a current is applied to the coil, it generates a magnetic field that moves the internal contacts, either opening or closing them depending on the relay’s configuration. The coil voltage must be within the specified range for the relay to function properly. If the voltage is too low, the relay may fail to activate, while excessive voltage could damage the coil or the relay itself. Types of Relay Voltage There are primarily two types of relay voltage：