This Key Operated Safety Switch with auxiliary key release was specially designed for monitoring doors and safety panels in mechanical installations. These Safety Key Switches form part of a safety interlock system, Ideal for safety doors, access panels that surround industrial equipment that may be hazardous when operational. The additional key provides additional security to the switch, ensuring the mechanism cannot accidentally be opened. The head can be adjusted in 90 degree steps after removing the fastening screws to suit differing applications.Rugged and durable, this metal bodied Key Operated Safety Switch comes complete with a M20 x 1.5 conduit entry and 1 NO & 1 NC key operated contacts. The Contact Block comes with captive screws, finger protection, twin bridge contacts and double interruption for higher contact reliability. This durable metal Key Operated Safety Switch is ideal for safety door applications, access panels, security installations and other such applications that need to monitor the open or closed status of a safety door or access panel.