This series of high-voltage vacuum load switches and combined electrical appliances are suitable for use in three-phase AC 12kV,
50Hz power systems, or in conjunction with complete sets of power distribution equipment, ring network switchgear, and combined substations. They are widely used in urban network construction and renovation projects, industrial and mining enterprises, high-rise buildings, and public facilities. They can serve as ring network power supply units or terminal equipment, playing roles in the distribution, control, and protection of electrical energy. The technical performance of this product complies with IEC Publication 60265-1/FDIS "High-Voltage Load Switches, Part 1: High-Voltage Load Switches for Rated Voltages Above 1kV and Up to 52kV," IEC 60420 "High-Voltage AC Load Switch-Fuse Combination Electrical Appliances," GB 16926 "AC High-Voltage Load Switch-Fuse Combination Electrical Units," and GB 3804 "3-63kV AC High-Voltage Load Switches."
This product features high breaking capacity, safety and reliability, long electrical lifespan, frequent operation capability, compact structure, small size, light weight, and requires minimal maintenance. It has the ability to break rated current, overload current (FZN21-12D/T125-31.5 can break short-circuit current), and prevent equipment phase loss operation. The switch has a clearly visible isolation gap, is equipped with a grounding switch capable of closing, and an electric spring mechanism, enabling remote operation and control.