12kv Indoor High Voltage Load Break Switch

Model NO.
Conventional Circuit Breaker
Transport Package
Wooden Case
Zhejiang, China
HS Code
All we do is always involved with our tenet " Consumer initial, Trust first, devoting within the food stuff packaging and environmental defense for 12kv Indoor High Voltage Load Break Switch, The product will supply to all over the world, such as: Macedonia, Cairo, Hyderabad, We set a strict quality control system. We have return and exchange policy, and you can exchange within 7 days after receive the wigs if it is in new station and we service repairing free for our products. Please feel free to contact us for further information and we will offer you competitive price list then.
Zhejiang Farady Powertech Co., Ltd. Diamond / Audited Supplier

FLBS an indoor high-voltage SF6 load switch, an switchgear with the rated voltage of 12kV/24kV, adopted with SF6 gas as an arc-extinguishing and insulation medium, including the three contactors for switching-on and switching-off and to-ground, and is characteristic in its small volume, its convenient installation and operation and its the great adaptability with surroundings.
FLBS of an indoor high-voltage SF6 load switch and FLBS of SF6 load switch plus fuse combination can function to protect and control the electric equipments for power supply and transformer substations especially being suitable for ring net cabinet, cable branch cabinet and distribution switching substation.
FLBS of an indoor high-voltage SF6 load switch and FLBS load switch plus fuse combination are complied with the standards of GB3804-1990, IEC60256-1,1997, GB16926, IEC60420 etc..

Service environment
a) Air temperature
Maximum temperature: +40ºC; Minimum temperature:-35ºC
b) Humidity
Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level
Maximum installation altitude: 2500m
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake


No Item Unit Parameter
1 Rated voltage kV 12 24
2 Rated frequency Hz 50/60
3 Rated current A 630/800
4 1min Power frequency
withstand voltage
wet kV 38 50
dry kV 48 60
5 Lightning impulse withstand voltage kV 75 125/150
6 Rated short circuit breaking current (peak) kA 80 63
7 Rated active load and close circuit breaking current A 63 50
8 Rated transferring current A 1700 1200
9 Rated short circuit making current (peak) kA 80 63
10 Rated cable(line) charging breaking current A 50 and 10
11 Cable charge breaking current in earthing fault A 20 20
12 Rated withstand current (peak) kA 80 63
13 Short time withstand current (2s) kA 31.5 25
14 Mechanism life times 5000 2000

Note: For short circuit breaking and peak current is based on Fuse plus combination.

Detailed image

Mechanism and function
Working principle of single spring mechanism type spring press and release
Working principle of double spring mechanism type is same as K type, in addition, it has fuse striker trip function. For A type mechanism, electromagnetic trip is also available on customers requirement.

Outline dimension & installation sizes
Matching dimension of SF6 load break switch-fuse combination
Fig 1) SF6 load break switch without upper cubicle

1-External case 2-Load break switch 3-Mechanism room

Primary circuit loop of load break switch

Primary loop of FLBS indoor load break switch and its combination is sealed in a epikote casted insulate unit by APG technology,this insulate unit has features of good insulating property, dust and dirts proof, insulate unit contains upper and lower insulatecovers, inside charged 0.4bars pressure SF6 gas, the partial siding of lower cover is very thin, its a protective measure and will burstout in the malfunction, the over pressed gas is released to protect the equipment.
Sf6 load break switch and its fuse combination has open,close and earth three working position.


Arc extinction

FLBS load break switch adopts SF6 gas as the medium of arc extinction, when switch on and off, arc occurs and will spin under the and its fuse combination works with spring type operating mechanisms A and K,AFL-12D load break switch equipped with the K spring operating mechanism is applied as the incoming control unit, while that equipped with A mechanism is applied as the outgoing protective unit and transformer unit.
1) “K” Type Spring Operating Mechanism
Working principle of K type spring operating mechanism is spring press and release ( see fig 1. its in off position)
A) Earthing operation
Driven by the handle, upper crank arm 4 rotates and presses spring 2 to store energy, when the max energy reached continue rotatethe crank arm, the energy storage spring starts to release energy and drive the upper trigger, enables the connecting bar to drive thecrank arm, crank armrotates and drives the moving contactor for earthing.
B) Switch on operation

Driven by the handle, lower crank arm 1 rotates, presses spring 2 to store energy, when the energy released, it drives the trigger 8,enables connecting bar to drive the crank arm, crank armrotates and drives the moving contactor and load break switch turns on.
C) Switch off operation
Rotate the main shaft crank arm counterclockwise by the handle, release the energy storage spring and the load break switch turns off.
2) A” Type $pring Mechanism
Working principle of A type mechanism is same as K type, in addition, it has fuse striker unbuckle function. For A type mechanism,electromagnetic unbuckle is also available on customers requirement.(see fig 2)
A) Switch on operation
Driven by the handle, lower crank arm 1 rotates to presse switch on spring 12 and switch off spring 8 at the same time, to provide sufficient energy required by switching off. when the lower crank arm 1 buckles the pin and drives trigger to move, it makes the lowerroller wheel unbuckled,and release the switch on spring and load break switch turns on.
B) Switch off operation
Press the switch off button or push the unbuckle pin 2 by the fuse striker, release the spring and load switch turns off.
C) Earthing operation
Earthing operation of A type mechanism ¡s same as that of K type.
3) K type and A type operating mechanism can be operated manually or motorized on request.
***Notice: only when the load break turns off, can turning on and earthing operation be done.


Packing & Delivery

About us

Zhejiang Farady Powertech Co.,Ltd
Http:// www.farady.com.cn