Tongue Operated Switches

Tongue operated safety interlock switches fit to the leading edge of sliding, hinged, or lift-off machine guards to provide positively operated switching contacts and a tamper-resistant (not easily defeatable) key mechanism. Used independently to provide positively operated contacts to EN60947-5-1 or in combination with any dual channel safety monitoring relays to provide up to category 4 PLe ISO13849-1. The switch is mounted to the frame of the guard or machine, and the actuator profile is fitted to the moving part (frame) of the guard and aligned to match a cam mechanism within the switch entry aperture, providing a positively operated interlock switch. Inserting the actuator into the switch closes the safety contacts enabling the machine start circuit. Withdrawing the actuator positively opens the safety contacts.