MICRO SWITCH GLL Series Global Limit Switches, Top Plunger, 1NC/1NO Direct Opening SPDT snap action, 1/2 in conduit MICRO SWITCH GLL Series limit switches are double insulated compact housing conforms to EN50047 and makes GLL switches ideal for mounting where space is at a premium. These products also feature direct opening normally closed circuits, and are available in a variety of actuator styles required for OEM applications. Designed to the IEC electrical standard, GLL is suitable for world-wide use and also meets globally accepted mounting standards.