The OL-KL1 is a lock-out adaptor designed to provide lockout protection for IDEC TWTD series pushbuttons and knob selectors with 30mm (1.20") panel cutouts. This accessory features a waterproof rubber gasket (0.5mm thick) and accommodates panel thicknesses from 0.8 to 3.2 mm, with a key hole diameter of 8 mm for secure locking. The adaptor is constructed with durable materials suitable for industrial environments and integrates seamlessly with the modular TWTD series design. It is commonly used in control panels and machinery where operator safety and accidental activation prevention are critical requirements, particularly in hazardous or high-risk operational settings.