A power relay is a device that uses an electromagnet to open or close a circuit when the input (coil) is correctly excited . They provide a high level of isolation between the control signal (coil) and the output (contacts) – typically with a rated impulse voltage of 4 or 6kV Specification: Brand Name : CNC Certificate : cerium Theory : Other Customizable or not : That's right Contact load : Other Model Number : MK-2P Protection features : Other Usage : Other Package includes: 1 x CNC Power Relay 8 Pin MK-2P