Application Used at places where suitable care is required so that nobody can enter in premises or area where high current/voltage electrical is active 24*7 by Door/ Gate.Commonly used in Dry Transformers and Switchgear and Substation yard, etc. Working Each assembly is so designed that keys of the door are inside the cabinet. Keys are further locked by help of solenoid. Which is activated when transformer is in charged condition. Nobody....... Click Here For More Description