General:

KJFZN25-12D series indoor AC HV load switch-fuse combination electrical appliances (hereinafter referred to as series switches) are designed and developed independently. The performance meets the requirements of GB3804-90 3-63kv AC high-voltage load switch and IEC420 AC high-voltage load switch-fuse combination electrical appliances; (1990 edition) and national standards (draft for approval), with the advantages of reliable breaking, long electrical life, frequent operation, basically no maintenance required when breaking and transferring current, and obvious isolation fracture. The load switch-fuse combination electrical appliances also have the function of protecting transformers from overload and preventing equipment from running in phase loss.

HV load switch KJFZN25-12D is suitable for three-phase AC 50Hz ring network or terminal power supply and industrial power equipment for load control and short-circuit protection. The load switch can open and close loads, closed-loop currents, no-load transformers and cable charging currents. The combined electrical appliance can break any current up to the rated short-circuit current. It adopts direct-acting isolating break and vacuum interrupter linkage. It has manual and electric functions. With unique transmission structure design, the interrupter only withstands high voltage at the moment of closing and breaking, so it is small in size and light in weight. It can realize one-time operation of the isolating break and the interrupter break. There is a grounding valve that is linked to the grounding switch between the static contact and the moving contact conductive cylinder, which is convenient for maintenance;

 KJFN25-12D, KJFZRN25-12D load switches and combination devices are suitable for urban distribution stations and industrial power equipment in three-phase ring networks or terminal power supply for load control and short-circuit protection. As combination devices are more reliable and economical than circuit breakers in protecting transformers and other electrical equipment, they are particularly suitable for ring networks, dual-radiation power supply units and box-type substations.