HKKC1L Series of Mini. Breakers HKKC1L-63 series of residual Mini breakers is mainly used in AC. 50Hz/60Hz, rated voltage up to 400V below lines to protect load/lines from over-load, short-circuit and Elec. leakage. The product has a beautiful out-looking, light weight, perfect & reliable Elec. performances, high breaking capacity, rapid tripping and reliable mounting channel