FZN21-12D 630-20 High Voltage Vacuum Load Switch
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- Product Overview
- The FZN21-12D/630-20 Type Indoor AC High-Voltage Vacuum Load Switch and FZN21-12D·R/125-31.5 Type Indoor AC High-Voltage Vacuum Load Switch-Fuse Combination Device are control and protection devices for three-phase AC 50Hz, 12kV power distribution systems. Oil-free, non-toxic, and free from fire and explosion hazards, the products are widely used in power distribution stations of industrial and mining enterprises, urban buildings, and other locations. Compared with circuit breakers, the latter offers more reliable protection for electrical equipment such as transformers, and is particularly suitable for ring networks, dual radial power supply units, and compact secondary substations. The load switch is designed, manufactured, and inspected in accordance with GB 3804-2004 "AC High-Voltage Load Switches for 3~63kV" and its relevant standards; the combination device is designed, manufactured, and inspected in accordance with GB 16926-2009 "AC High-Voltage Load Switch-Fuse Combination Devices" and its relevant standards. The FZN21-12D/630-20 Type Indoor AC High-Voltage Vacuum Load Switch (hereinafter referred to as the "load switch") is an indoor device designed for three-phase AC 50Hz systems with a rated voltage of 12kV. It is suitable for applications such as power distribution stations and substations of industrial and mining enterprises, serving as protection and control for electrical facilities. It is used to switch on and off load current, loop current, no-load transformers, and cable charging current. Equipped with an earthing switch capable of closing short-circuit current, its operating mechanism supports both manual and electric operation, facilitating the realization of three remote control requirements (remote control, remote signaling, remote measurement) in power systems.
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Service Conditions
Altitude: ≤1000m
Ambient air temperature: upper limit +40℃; lower limit -25℃ (storage and transportation at -30℃ is allowed), with the 24-hour average not exceeding +35℃
Relative air humidity: daily average ≤95%, monthly average ≤90%
Seismic resistance: seismic intensity not exceeding Degree 8
The surrounding air shall be free from obvious pollution by corrosive or flammable gases, water vapor, etc.
No frequent violent vibrations
Pollution degree: Class Ⅱ
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