AutomationDirect has expanded its line of safety products to include solenoid interlock safety switches. Solenoid locking tongue interlock safety switches are designed to fit to the leading edge of sliding, hinged or lift-off machine guards, and provide positively operated switching contacts. They provide a tamper-resistant actuator mechanism and robust position interlock detection for moving guards. Available in 30-, 40- and 73-mm mounting profiles, the switches are designed with multiple actuator entry points and offer adjustable heads with 90- and 180-degree options. Switch styles provide single and multiple half-inch female NPT conduit openings.