12KV Load Break Switch

Type: FKN12
Summary
FKN12-12D/630-50 indoor AC high voltage load break switch, rated voltage is 12KV, rated frequency is 50Hz. It is a kind of three phases high voltage switch equipment. It can be used to breaking- closing load current, closed current, charge current for no-load transformer and cable, closing short-circuit current. The Load break switch which assembled earthing switch can sustain short-circuit current.
FKRN12-12D/100-31.5 indoor AC high voltage load break switch-fuse combination electrical appliance is a combinated indoor high voltage switch equipment which combinated by FKN12-12D load break switch and S□LAJ-12(XRNT□-12)high voltage limiting current fuse. This appliance can open any current up to short circuit current; Load break switch open working current, Fuse open short circuit current,combination

open any current from working current to short circuit current, meantime Fuse makes the Load break switch opening through striking.
Sphere of application
FKN12-12D Load break switch, FKRN12-12D Combination electrical appliance mainly used in three phases ring-operated network, city terminal power supply station and industry electrical equipment working for load operation and short circuit protection. Since the combination electrical appliance is better than Circuit breaker in protecting tranformer and some other electrical appliance, especially in ring-operated network and box type transformer substaion.
Normal working condition
Air temperature: +40℃ ～ -25℃;
Altitude: No more than 1000mm;
Relative humidity: average of one day no more than 95%, average of one month no more than 90%;
Surrounding air cann’t be polluted by corresive or combustive air and water vapour;
Have no severe shake.
Polluting resisting class: Ⅱ class;
If the using condition exceed the above, please consult with the manufacturer.

Number	Item	Unit	Data
Number	Item	Unit	Fn12-12d/630		Fn12-12(R)D/125
1	Rated voltage	kv	12
2	Rated frequency	Hz	50
3	Rated current	A	630		100
4	1 min power frequency withstand voltage	kv	Earthing to earthing and between phase 75,isolation fracture 85
5	Light implus withstand voltage	kv	Earthing to earthing and between phase 42,isolation fracture 48
6	Rated thermal stable current	kA	20(4s)
7	Rated peak withstand stably current	kA	50
8	Rated making current(peak)	kA	50		50
9	Rated breaking current (expected value)	kv			31.5
10	Critical breaking current max 1² ·T	Hz			As per fuse characteristics curve
11	Min breaking current	A			As per fuse characteristics curve
12	Rated shift current	kv			1.5
13	Breaking current	kA	1.8
14	Breaking off-load transformer capacity	kVA	1250
15	Rated cable charging current	A	10
16	Rated active load current breaking times	Time	10000
17	Ram touched load switch off time	S		<0.06
18	Earth switch thermal stable current	kA		20(2s)
19	Earth switch thermal stable current (peak)	kA	50	50
20	Motor operation supply voltage	V	AC&DC 110、220

Type: FKN12