YF011U2C203NQ is a 4-tumbler miniature switchlock designed for secure keyed switching applications in industrial and commercial equipment. It features single-pole configuration with 90° indexing and keypull capability at positions 1 and 2, providing positive detent operation with integral detent mechanism. The switchlock is rated for 4 amps at 125 V AC or 28 V DC, with contact resistance below 10 mO typical and insulation resistance of 10? O minimum, supporting 10,000 make-and-break cycles at full load. The housing is constructed from 6/6 nylon (UL 94V-2) with copper contacts silver-plated for reliable electrical performance, and includes a brass mounting nut with M12 × 1.25 threading. This switchlock is commonly used in computer servers, point-of-sale terminals, and cash registers where secure, keyed access control is required.