A Timer Relay is a combination of an electromechanical output relay and a control circuit . The contacts will open or close before or after a pre-selected, timed interval. ... This trigger signal can either be a control switch (dry contact switch) or a power trigger (voltage). https://youtu.be/xK5D_pxorS8 Specification: Brand name : TENSE Certification : THIS Origin: CN (Origin) Theory : time relay Custom : Yes Touch load : major power Model Number : ERV-60 Protective Feature : SEALED Usage: Main objective Fashion : On Delay Relay : Timer Type: time relay . Package includes: 1 x TENSE ERV-60 Timer Relays