YBLT-FS∕201 foot switches apply to the control circuit, whose alternating current is 50Hz/60Hz,voltage is 380v,direct current is 220v,as electrical control of machinery tools,armarium and so on. The normal operation of switch is on altitude, which is not exceeding 2000m,ambient temperature is -30℃~+40℃,relative air humidity is not more than 85%;up to standard:GB/T 14048.5, IEC 60947-5-1.