Russian standard, limit switch BK200/300,are designed for AC 60HZ, rated ... voltage D.C. up to 440V. 1. APPLICATION.The limit switch BK 200, BK 300 are designed for operation in distribution ... controlled object. The switches can be installed in any position in the field, protected from dust and accidental ingress ... no more than600Mechanical durability, million cycle, no less than16 Limit Switch BK200