FZN21-12D/T630-20 Indoor High Voltage Vacuum Load SwitchDetailed product description：

The ZFN21-12D/T630-20 indoor high-voltage vacuum load switch is a three-phase AC 50Hz indoor high-voltage switchgear suitable for distribution systems with a rated voltage of 12kV. The ability of switchgear to close, carry, disconnect loads and overload currents; It can also disconnect and close no-load long lines, no-load transformers, and capacitors.
ZFN21-12DR/T125-31.5 indoor high-voltage vacuum load switch - fuse combination electrical device, is composed of this load switch and fuse, and has protection function in addition to the above functions.

·Environmental conditions for use
1. Surrounding air temperature:+40 ℃ -10 ℃;
2. Altitude not exceeding 1000m;
3. Relative humidity: no more than 90% in indoor areas (+25 ℃);
4. In an environment without conductive dust;
5. Objects without corrosive gases that damage metals and insulation;
6. Places without severe vibrations and impacts;
7. In an environment without the danger of combustion and explosion.

Technical parameters of FZN21-12D/T630-20 indoor high-voltage vacuum load switch
1. Main technical parameters of load switch:

serial number	project	unit	numerical value
one	rated voltage	kV	twelve
two	rated frequency	Hz	fifty
three	rated current	A	six hundred and thirty
four	Rated Active load breaking current	A	six hundred and thirty
five	Rated closed-loop breaking current	A	six hundred and thirty
six	5% rated active load breaking current	A	thirty-one point five
seven	Rated cable charging breaking current	A	ten
eight	Rated no-load transformer capacity	kVA	one thousand two hundred and fifty
nine	1-minute power frequency withstand voltage: (vacuum break, phase to phase, relative ground/isolation break)	kV	42/48
ten	Lightning impulse withstand voltage: (vacuum break, phase to phase, relative ground/isolation break)	kV	75/85
eleven	Rated short-time withstand current (thermal stability)	kA/S	20/4
twelve	Rated peak withstand current (thermal stability)	kA	five
thirteen	Rated short-circuit closing current	kA	fifty
fourteen	Rated current breaking times	time	ten thousand
fifteen	mechanical life	time	ten thousand
sixteen	Allowable wear thickness of vacuum arc extinguishing chamber contacts	mm	two
seventeen	Manual operation force distance	Nm	≤200

2. Main technical parameters of FZN21-12D/T630-20 indoor high-voltage vacuum load switch combination electrical device:

serial number	project	unit	numerical value
one	rated voltage	kV	twelve
two	rated frequency	Hz	fifty
three	Maximum rated current of fuse	A	one hundred and twenty-five
four	Rated breaking and handover current	A	three thousand one hundred and fifty
five	The opening time of the switch triggered by the fuse	ms	40±5
six	Rated short-circuit breaking current (effective value)	kA	thirty-one point five
seven	Rated short-circuit closing current (peak)	kA	fifty
eight	1-minute power frequency withstand voltage: (vacuum break, phase to phase, relative ground/isolation break)	kV	42/48
nine	Lightning impulse withstand voltage: (vacuum break, phase to phase, relative ground/isolation break)	kV	75/85
ten	Fuse impactor output ± energy