It is a three phase H.V. switch equipment of 12KV, 50Hz for breaking or closing load current., no-load transformer cable charging current and closing short-circuit current. The load switch with earth switch can bear short-circuit current.
It is made up of FN12-12D load switch and S()LAJ-12(XRNT()-10) H.V. current-limiting fuse box. It can break any current, load switch breaking working current and fuse box breaking short-circuit current, jointly breaking any current between short-circuit current. Meantime, fuse box make the switch off of with the striker.

++++Service Condition:
A. The ambient air temperature: Max.: +40 °C. Min: -10 °C.
B. The altitude ≤ 1000m.
C. The relatire humidity of air. daily average ≤ 90%. monthly average ≤ 95%.
D. The ambient air should not be obviously polluted by corrosivity or the flammability gas and geam. etc.
E. Without frequent shake.
F. Enviroment degree: grade Ⅱ.
If requirements are not mentioned above, users can fix them with the manufacturer.

++++Technical Parameter and Performances:

Number	Name	Unit	FN12-12D/630-20	FN12-12D.R/100-31.5
1	Rated voltage	kV	12
2	Rated frequency	Hz	50
3	Reated current	A	630	100
4	Lighting impulse resisting voltage	kV	75/85
5	1min power frequency with stand voltage	kV	42/48
6	Rated heat - stability current	kA	20(4S)
7	Rated machine-stability current	kA	50
8	Rated closing current (peak)	kA	50
9	Rated short-circuit breaking current	kA		31.5
10	Rated transfer current	kA		1.5
11	Max. breaking current	kA	1.8
12	Breaking no-load transformer capacity	Kva	1250
13	Rated cable charging current	A	10
14	Rated power load current breaking times	time	>100
15	Switch-off time of rated power load current switch on-and-off	S		>0.06
16	Earth switch heat-stability current	kA	20(2S)	20(2S)
17	Earth switch heat-stability curreak (peak)	kA	50	50
18	Motor operating power valtage	V	AC220,DC48