Relays are fundamental components in various electrical and electronic systems, acting as switches that control circuits. They allow low-power signals to control higher power loads, enabling the automation of processes in industrial, automotive, and household applications. One of the critical parameters in relay operation is the relay voltage, which determines how a relay is activated and how it manages the power it controls. In this article, we will explore the concept of relay voltage, including coil voltage and contact voltage, and how they are essential for proper relay function and selection.
What is Relay Voltage? Relay voltage refers to the electrical voltage required to operate a relay. It can be categorized into two primary types： coil voltage and contact voltage. These two are crucial for understanding how a relay functions in a circuit and ensuring compatibility between the relay and the connected systems. Coil Voltage The coil voltage is the voltage applied to the relay’s coil, which generates a magnetic field to move the internal switch. The relay’s coil is a key element in its operation. When a voltage is applied to the coil, it induces a magnetic force that pulls or pushes an internal armature or plunger, causing the relay’s contacts to either open or close.