L21D1S001-AZZ00-000 is a sealed locking rocker switch from the L-Series product line designed for industrial control applications. The switch features a single pole (SP) circuit configuration with terminals 1, 2, and 4, and is rated for 4VA @ 28VDC resistive operation. It is housed in an industry-standard mounting hole of 1.734 x 0.867 inches (44.04 mm x 22.02 mm) and accommodates panel thicknesses from 0.030 to 0.156 inches (0.76 mm to 3.96 mm). The switch is IP67 certified for sealed front panel components and operates reliably across a temperature range of -40°C to +85°C, with moisture resistance tested per MIL-STD 202F Method 106F. This locking rocker switch is ideal for construction machinery, agricultural equipment, and on-highway transportation applications where reliable, sealed switching and operator control are essential.