At its core, a Power Relay is an electrically operated switch that opens or closes circuits based on signals from a low-power control system. It consists of several key components： a coil, contacts, a movable armature, and a spring. The coil, when energized, creates a magnetic field, which pulls the armature and moves the contacts to either open or close the circuit. The contacts can be either Normally Open (NO) or Normally Closed (NC), depending on the intended operation.

    How Does a Power Relay Work?

    The principle behind a power relay is simple yet crucial. When a small current is applied to the relay coil, the magnetic field generated moves the armature. This action causes the relay contacts to change their state—either opening or closing the circuit. In the absence of current, the contacts return to their default state, usually with the help of a spring mechanism.