KM1101RR02QE is a subminiature pushbutton switch from the KM Series, designed as an off-momentary SPST normally open switch with reliable contact design and RoHS compliance. The switch features a 1/4-40 UNS thread bushing with 0.225 inch height, 0.122 inch diameter actuator, and PC thru-hole termination (0.050 x 0.020 inch contacts). It delivers 0.25 AMPS @ 125 V AC or DC contact rating with contact resistance below 30 mO typical, insulation resistance of 10? O minimum, and dielectric strength of 1,000 Vrms minimum at sea level. The switch operates reliably over -30°C to 85°C temperature range with 10,000 actuations minimum electrical life at full load, featuring 0.095 inch pretravel and 0.120 inch total travel. Ideal for alarm systems, computers, and detector switch applications requiring compact, dependable switching performance.