The LK11-Y/R-U is a door interlock handle designed for safety and access control on enclosures. It features a retention mechanism that limits rotation to 90 degrees from off to on and keeps the handle in the off position while the cabinet door is open. This yellow and red handle is lockable with up to three 1/4" padlocks for enhanced security and is environmentally rated to UL Type 4X and IP67 for robust performance. A defeater mechanism allows trained professionals to open the door while the system is on, making it suitable for industrial control panels and machinery where operational safety is paramount.