The ASD220NU is a 2-position maintained selector switch from IDEC's TWND series, featuring 2 normally open (2NO) contacts for reliable switching in industrial environments. This switch is available with knob, lever, or key operator styles and supports multiple mounting configurations (positions 1 and 2) with maintained operation. The switch is designed for ø30mm panel mounting and integrates into IDEC's modular pushbutton and selector switch platform, offering rugged construction with self-cleaning contacts and chrome-plated zinc components. It is commonly used in machinery control, process automation, and equipment start/stop applications where durable, long-life switching performance is required.