Standex Electronics' R12575 Micro-Proximity Switch
R12575 micro-proximity switch is 0.379 in. long with a 0.098 in. diameter. There is no power draw in the off state. It has a response time of 0.2 ms, release time of 0.1 ms, a power rating of 3 VA maximum, and will switch 0.1 Adc with a carry current rating of 0.5 A.