Emergency push button switches 1) mounting size: 22mm 2) operational voltage: 380ac or 220dc 3) operational temperation: -25 to +70 4)operational humidity: 45% to 90% 5) power-frequency withstand voltage: 2500v ac, 1min 6) contact resistance: 50m 7) mechanical durability: monentary 1000, 000, maintained 250, 000 8) electrical durability: 500, 000 9) protection grade: ip65
