Allen-Bradley 800FP-KM34PX40 Key Selector Switch

Allen-Bradley 800FP-KM34PX40 is a 22.5 mm plastic, 3-position key-operated selector switch that provides three maintained positions for manual control of equipment. It is rated for up to 600 V and 10 A and uses four normally open contacts (4x NO) with a screw-terminal contact block for straightforward wiring. The device is a keyed selector switch with a center-key removal feature, designed for secure position selection in control panels; the nominal panel cutout diameter is 22.5 mm. The contact block termination torque is 6–8 in-lb (0.7–0.9 N·m), and it accepts wire ranges #18 to #12 AWG (0.75–2.5 mm²). This KM34PX40 variant, the plastic 22 mm family member, is non-illuminated and intentionally designed for robust operation in environments where a physical key controls the active position.