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.
it's 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 rotate the crank arm, the energy storage spring starts to release
energy and drive the upper trigger, enables the connecting bar to drive the crank arm, crank arm
rotates 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 arm
rotates 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 Spring 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 lower roller 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 is 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.
Operating Mechanism & Interlock
****Mechanism interlock
FLBS indoor type medium voltage SF6 load break switch and its fuse combination has below
interlocks:
A) When load break switch turns on, earthing operation can't be done
B) When earthing switch turns on, load break switch turns on/off operation can't be done
C) Interlock outlet of mishandling pretension is equipped
Installation, Maintenance & Service.
****Installation, Adjustment
FLBS type load break switch has been strictly tested before outgoing from the factory, and fully
meet the technical standards, must carefully read the installation manual and prepare as below
before the installation and adjustment.
Check the external appearance, any damage product is not allowed to use.
Clean the equipment and get rid of the dust and dirt may cause by the transportation or other
causes.
After installation, be sure the load break switch is turned off, insert the handle to the earthing
operating hole in the up part of operating panel, and rotate the handle clockwise in 180o to earth
the switch, rotate counterclockwise in 180o to switch off the earth.
For switching on, turns off the load break switch firstly, insert the handle to the load break switch
operating hole in the lower part of panel and turn on the load switch.
From the switch on to switch off, for K type mechanism, insert the handle to the load switch
operating hole and rotate it in 180o to switch off; for A type mechanism, press the "switch off"
button to switch off the load break switch, observe from the winder to confirm it, check whether
the on/off indication plate works properly.
Notice: only when the load break turns off, can turning on and earthing operation be done !
Maintenance & Service
On condition of installing in environment as this manual required and normal operations, product
guaranteed to be fault free for 10 years and has a running life of 25 years, but regular check per 6
months is required.
Keep the external appearance away from dust, dirt and damp.
Lubricate and operate the mechanism for 3-5 times, check whether it acts properly.
Check with the pressure meter regularly, in case of meter data lower than 0.01MPa, should
When the malfunction happens in the load break switch and fuse combination, and one of the
three phase immediately, gas charging should be done by professional personnel from or trained
by the manufacturer. uses burns out, all three fuses should be replaced at one time, must earth
the switch before the replacement.
Matters need attention
It is NOT allowed to disassembly the self-sealed valve in front of switch( connecting end of
meter).
It is NOT allowed to unload the seal screws on switch at any time.
Ordering Instructions
****Ordering instructions:
1. Belowing terms should be marked while ordering:
Model number, product name and quantity.
Model of operating mechanism ( A,K ).
Provide the rated voltage specification if motorization operating is required.
For load break switch + fuse combination, fuse model and specification is required.
Other special requirements.
2. Documents with product from manufacturer:
Certificate of qualification.
Testing report for products.
Packing list.
Other technical documents.
Packing & Delivering
Contact
Zhejiang Farady Electric Co.,Ltd
TEL:0086-577-61722510/61777258
Fax:0086-577-61777257
Http://faradypowertech.en.made-in-china.com
Add:Xiangyang Industrial Zone,Liushi,Yueqing,Zhejiang,P.R.China, 325604
Audited Supplier 
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