The LK-LBS is a three phase air `puffer` load break switch. On each phase, the cylindrical moving contact also acts as an air piston during opening.The fixed contact on the incoming terminal includes an arc conductor rod which channels the arcing plasma to within the air piston after the main contacts are seperated. The compressed air generated by the moving contact/air piston in the opening motion then blows, deionizes and extinguishes the arc.

The three phases are mounted on a chasis which also mounts a fault-making earth switch. The LK-LBS is also built to house HV HRC fuses. A stored energy mechanism on the LK-LBS allows for shunt tripping and fuse triggered tripping. The LK-LBS can be manually operated or motor operated.

Every unit of LK-LBS is built with an interlock mechanism which ensures proper operational sequence between the load break switch, the earth switch and the access to the service cubicle of the panel.
The LK-LBS with fuse holders to house HRC fuses.
Fixed contact on incoming terminal
Arc conductor rod which acts as conductor after main contacts are seperated in order to channel the arcing plasma to within the piston.
Fixed contact on outgoingterminal
Fault-making earth switch interlocked in opposing sequence with load break switch
Epoxy bell shaped chamber which houses the incoming terminal and contains arcing activity within during opening
Earthed shutter which segregates the live incoming terminal simultaneously as earth switch is closed.
Operating panel within which houses the interlock between load break switch and earth switch.
Moving Contact whose piston like design enables it to "puff" air at the arcing plasma when breaking.
Rated voltage (kV)
12
17.5
24
Rated current (A)
400/630
400/630
400/630
Frequency (Hz)
50-60
50-60
50-60
Apply voltage 50Hz/1min (kV)
42
48
Impulse test voltage (kV)
85
95
125
50
Overload breaking capacity (of contacts only)  (A)
1600
1000
No load transformer breaking capacity (A)
16
20
25
No load cable breaking capacity (A)
16
25
Rated short-time current (kA/sec)
20/2
20/2
20/2
Making capacity (kA)
50
50
50
Dielectric strength for earth switch (kA/sec)
20/2
20/2
20/2
Mechanical life (C-O cycles)
4000
4000
4000
Electrical life at nomimal current (C-O cycles)
500
400
300
10
TECHNICAL DATA FOR LK-LBS
1300
Short circuit breaking capacity (wtih fuses)  (kA)
50
50
50
LK-LBS Air Puffer Switch
Load Break Switch Products

 

 

 

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