The PS-5S is part of Omron's PS-series door interlock switches, which are designed to detect doors and prevent unauthorized access. The PS-5S is a single-pole, double-throw switch and can be mounted either on the door (with the door closed and locked) or on the frame of the door. It has a long-life, die-cast housing for reliable operation and a 2-position switch that is activated when the door is opened and released when the door is closed and locked. In addition, the PS-5S has an LED indicator to visually show that the switch is working properly.