I. Overview

FZN21-12D/630-20 indoor AC high-voltage vacuum load switch and FZN21-12D·R/125-31.5 indoor AC high-voltage vacuum load switch-fuse combination appliance are for the control of three-phase AC 50Hz, 12kV power distribution system and protective devices. The products are oil-free, non-toxic, and have no fire and explosion hazards. They are widely used in factories, mines, enterprises, urban building power distribution stations and other places. The latter is more reliable in protecting electrical equipment such as transformers than circuit breakers, and is particularly suitable for ring networks, dual-radiation power supply units and box-type substations.

The load switch is designed, manufactured and inspected in accordance with GB3804-2004 "3~63kV AC High Voltage Load Switch" and its related indicators; the combined electrical appliance is designed, manufactured and inspected in accordance with GB16926-2009 "AC High Voltage Load Switch-Fuse Combination Electrical Appliance" and its related standards. test.

The FZN21-12D/630-20 indoor AC high-voltage vacuum load switch (hereinafter referred to as the load switch) is an indoor device with three-phase AC 50Hz and rated voltage 12kV. It is suitable for use in power distribution stations and substations of industrial and mining enterprises as an electrical Protection of facilities and overhead for switching load currents, closed loop currents, no-load transformers and cable charging currents. It has an earthing switch capable of closing short-circuit currents. Its operating mechanism can be manual or electric, which facilitates the realization of the three remote control requirements of the power system.

2. Conditions of use

Altitude ≤1000m

Ambient air temperature: upper limit +40°C; lower limit -25°C (storage and transportation allowed at -30°C), the average value within 24 hours is not higher than +35°C

Relative air humidity: daily average value is not greater than 95%, monthly average value is not greater than 90%

Earthquake resistance: earthquake intensity does not exceed 8 degrees

The surrounding air is not significantly contaminated by corrosive or flammable gases, water vapor, etc.

No frequent violent vibrations

Pollution level: Level II