FZN21A-12 and this type of indoor AC high voltage load switch- fuse combination units appliances for three-phase AC 10kV, 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.

Technical performance of the products meet the IEC publication 60265-1/FDIS <igh voltage switches, Part 1: Rated voltages below 1kV over 52kV high voltage load switch> IEC60420<igh Voltage AC load switch – fuse combination units> and CB16926<C High-voltage load switch - fuse combination units> GB3804<-63kV AC high voltage switches>equirement.

This product has a breaking capacity, safety and reliability, long life, can operate frequent, compact structure, small size, light weight, the basic no need to maintain. Breaking with rated current, overload current (FZRN21A-12 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.

++++Main Technical Paramete:

Load switch main technical parameter

ltem	Unit	Data
Rated voltage	kV	12
Rated frequency	Hz	50
Rated current	A	630
Rated active load breaking curren	A	630
Rated closed loop breaking current	A	630
5% rated active load breaking current	kA	31.5
Rated cable charge breaking current	A	10
Rated iding transformer capacity	kVA	1250
1min power frequency withstand voltage:(Vacuum fracture,phase direction,phase to earth/lsolation fracture)	kV	42/48
Lightning surge withstand voltage:(vacuum fracture,phase to phase,phase to earth/lso lation fracture)	kV	75/85
Rated short-time withstand current(themal stable)	kV/S	20/4
Rated peak value withstand current(peak withstand stably)	kA	5
Rated short-circuit making current	kA	50
Rated current breaking times	Time	10000
Mechanical life	Time	10000
Vacuum explosion chamber contact permission attrition thickness	mm	2
Manual operation moment	Nm	≤200

Comebination electric appliance engineering parameter:

ltem	Unit	Data
Rated voltage	kV	12
Rated frequency	Hz	50
Fuse max rated current	A	125
Rated breaking ac current	A	3150
Fusetrigger switch on/off time	ms	40±5
Rated short-circuit breaking current (effective value)	kA	31.5
Rated short-circuit making current(peak value)	kV	50
1min power frequency withstand voltage:(Vacuum Fracture,phase to phase,phase to earth/lsolation fracture)	kV	42/48
Lightning surge withstand voltage:(vacuum Fracture,phase to phase,phase to earth/lsolation fracture)	kV	75/85
Fuse ram output energy	J	2-5

Mechanical characteristic technical parameter:

Ltem	Unit	Data
Distance of moving contact and fixed contact	mm	10±1
Overtravel	mm	4±0.5
Average closing speed	m/s	0.6±0.2
Breaking opening speed(before distance of moving and fixed contact 6mm)	m/s	1.1±0.2
Three-phase contact closing/opening asynchrunous	ms	≤2
Contact closing bounces time	ms	≤2
Air distance between charged bkdy and to earth	mm	≤125
Between upper and lower support main loop resistance	µΩ	≤70