HS5L Interlock Switches with Solenoid IDEC HS5L Interlock Switches with Solenoid are 2- and 4-contact safety switches designed to help protect on-site workers from dangerous heavy machinery. The HS5L line has a 13% shorter length compared to the conventional HS5E line, reducing the overall length to 127mm. IDEC HS5L Interlock Switches feature various other features and improvements including a 25% solenoid energy consumption reduction, head removal detection circuitry, a rear unlocking button, and a wide variety of actuators. Suitable applications include machines that do not shut down immediately, or maintain high temperatures.