Product overview：

FZN21-12D/T630-20 type indoor high-voltage vacuum load open three-phase AC 50Hz indoor high voltage switch equipment, suitable for rated voltage 12kV distribution system. Switch with closing bearing breaking load and the current load ability; can also be disconnected, closing the no-load long line, no-load transformer and capacitor.

FZN21-12DR/T125-31.5 type indoor high-voltage vacuum load switch fuse combined electrical apparatus, the load switch and fuse combination and become, in addition to having the functions also has protection function.

Use environment：

No more than 1000 meters of sea level;

The ambient air temperature is not higher than +40, and no less than -10;

Air relative humidity is not more than 90% of the indoor places (when the temperature is +25 DEG C);

In the environment of non conducting dust;

An object that has no damage to the metal and the corrosive gas;

No violent vibration and impact;

There is no danger of burning and explosion.

Technical parameters:

1, the main technical parameters of load switch:

Number Item Unit Data

1    rated voltage kV 12

2    rated frequency Hz 50

3  rated current A 630

4    rated active load current A 630

5    rated closed loop breaking current A 630

6    5% rated active load current A 31.5

7   rated cable charging breaking current A 10

8   rated no-load transformer capacity kVA 1250

9    1min power frequency withstand voltage: (vacuum fracture, interphase, relative / isolated fracture) kV 42/48

10   lightning impulse withstand voltage: (vacuum fracture, interphase, relative / isolated fracture) kV 75/85

11 rated short-time withstand current (thermal stability) kA/S 20/4

12    rated peak withstand current (thermal stability) kA 5

13    rated short-circuit current kA 50

14   rated current number of times 次 10000

15    mechanical life times 次 10000

16    the contact of the vacuum arc extinguishing chamber allows the wear thickness mm 2

17    manual force distance Nm ≤200

2、 the main technical parameters of the combination of electrical appliances:

Number Item Unit Data

1    rated voltage kV 12

2   rated frequency Hz 50

3    maximum rated current A 125

4   rated breaking current A 3150

5    Switching time of fuse ms 40±5

6    rated short-circuit breaking current（virtual value）

kA 31.5

7  rated short circuit off current（peak value） kA 50

8   1min power frequency withstand voltage: (vacuum fracture, interphase, relative / isolated fracture) kV 42/48

9  lightning impulse withstand voltage: (vacuum fracture, interphase, relative / isolated fracture) kV 75/85

10   the output of the fuse 2-5 J J 2-5

Appearance and installation dimensions