... standard, limit switch BK200/300,are designed for AC 60HZ, rated voltage A.C. up to 660V, rated voltage D.C. up ... to 440V. 1. APPLICATION.The limit switch BK 200, ... BK 300 are designed for operation in distribution system of AC 60HZ, rated voltage A.C ... than600Mechanical durability, million cycle, no less than16 Limit Switch BK200