The GKBA1LX is a key-operated Safety Interlock Switch with 1NC/1NO slow action contact configuration. It features 0.5 to 14 NPT conduit, silver contact, front and top head position operating for key. The Micro Switch™ GK series switches are key-operated safety interlock rugged metal switches which monitor the positions of gates, guards or doors. The key is attached to the moving portion of the gate, guard or door. When the gate is closed, the key is inserted into the GK switch indicating a safe position (gate closed) and the machine process can start. The positive opening normally closed contacts are held closed when the key is inserted into the GK switch. Opening the gate, removes the key from the switch. This action opens the normally closed contacts of the switch and interrupts the machine's control circuit. GK Series switches are designed with dual-entry positions for the key.