164J2A11 is a Command Series 16mm illuminated keylock switch designed for instrument-grade switching applications with maintained action and key pull left operation. The switch features snap-acting double break contacts that are gold plated over silver clad, providing reliable electrical performance with 1 normally open and 1 normally closed contact pair. It is rated for 0.4 VA at 20 VDC or peak AC, and 5 A at 250 VAC or 24 VDC (resistive), with an initial contact resistance of 20 milliohms maximum and insulation resistance of 100 megohms minimum. The switch operates over a temperature range of -20°C to +70°C and achieves 100,000 operations at rated current, with dielectric strength of 1,500 VAC. This keylock switch is ideal for control panels, industrial equipment, and applications requiring secure key-operated switching with visible status indication through its illuminated design.