Relays are switches that open and close circuits electromechanically or electronically . Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized. Specifications: Certification: NONE Origin: CN(Origin) Theory: Electromagnetic Relay Contact Load: Low Power Model Number: JJZX-22F/2Z AC220V(R) Protect Feature: Sealed Usage: General Purpose Coil Rated Voltage: AC220V Size: Miniature Package Includes: 1 x CHINT JZX-22F/2Z AC220V(R) General Relay