FZN21-40/T630-20 and FZN21-40(R)D/T125-31.5 type Indoor AC high voltage load switch- fuse combination units appliances for three-phase AC 40kV, 50Hz power system, or with the complete power distribution equipment and loop-network switch cabinet , combined substation and other ancillary uses, is widely used in urban network construction and transformation engineering, industrial and mining enterprises, high-rise buildings and public facilities ,can be used as ring power supply unit or terminal equipment, play power distribution, control and protection.
Breaking with rated current, overload current (FZRN21-40D/T125-31.5 can short-circuit breaking current) and to prevent equipment missing running ability to switch a visible fracture of isolation, with combined installed capacity of the ground with the relevant switches and electrical spring agencies, to remote control.
The use of environmental conditions
1.Air temperature: -25°C ~ +40°C;
3.Relative humidity: daily average is not more than 95%,
4.Installation places: No fire, explosion hazard, serious filthy places.
5.Contamination level: II
Mainly technical parameters
Maximum rated current of fuse
1min power frequency withstand voltage
Lightning impulse withstand voltage
Rated peak withstand current
4S rated short time withstand current
Rated active load breaking current
Rated closed loop breaking current
Rated cable charging breaking current
Rated short circuit breaking current
Rated short circuit making current
80(expected peak value)
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