FKN12A-12D compressor load switch, FKRN12A-12D series compressor load switch - fuse combinations, is my company developed a new series of switching equipment for 12kV and below the three-phase power distribution systems, as transformers, cables, control and protection of overhead lines and other electrical equipment used; particularly for urban and terminal box-type substation and rural power substation. And applies to the ring, double radiation power supply control and protection unit. FKN12A-12D series compressor load switch can division load current and overload current. FKRN12A-12D series compressor load switch - fuse combinations can start off to the rated short-circuit breaking current of any current.