KIRK - Model Type SKRU SD and HD Series - Solenoid Key Release Unit - Brochure

The Type SKRU consists of an interlock, a solenoid, and an auxiliary switch. The solenoid is designed to permit removal of the interlock key in response to an external electric signal. The auxiliary switch is a quick-make, quickbreak device, which operates when the interlock key is rotated. Normally, the key is trapped in the SKRU and the solenoid is de-energized. To release the key, a signal must be sent to the solenoid from an external source.