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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Interrupter Switch
Scheme # 30
To prevent paralleling lines A and B requires dropping load when shifting from one source to the other. To prevent closing both interrupter switches A and B at the same time. Permits both interrupter switches to be opened at the same time. To prevent operation (open or closed) of either interrupter switch when breaker is closed. Permits breaker to be serviced and operated while both interrupter switches are locked open.

Interlock Application Scheme # 30 - Interrupter Switch

Breaker and interrupter A are shown in closed position. Interrupter B is shown in open position. Key A-1 is held in breaker interlock. Key A-2 is held in interrupter A interlock.

To service breaker, proceed as follows:

  1.
2.

3.

4.
5.

6.

 Open breaker.
Turn key A-1 in L-O interlock on breaker to lock open. Key A-1 is now free.
Insert key A-1 in L-O-C interlock on interrupter A and turn to unlock. Key A-1 is now held.
Open interrupter A.
Turn key A-1 in L-O-C interlock on interrupter A to lock open. Key A-1 is now free.
Return key A-1 to breaker interlock and unlock for operation of breaker during servicing.

Reverse sequence to restore service.

To transfer load from interrupter A to interrupter B:

  1.

2.


3.


4.
5.

6.

7.
Proceed from normal positions with operations as in 1 through 4 above.
Turn key A-1 in L-O-C interlock and key A-2 in L-O interlock on interrupter A to lock open. Keys A-1 and A-2 are now free.
Insert key A-1 in L-O-C interlock and key A-2 in L-O interlock on interrupter B and turn to unlock. Keys A-1 and A-2 are now held.
Close interrupter B.
Turn key A-1 in L-O-C interlock on interrupter B to lock closed. Key A-1 is free and key A-2 is held.
Insert key A-1 in L-O interlock on breaker and turn to unlock. Key A-1 is now held.
Close breaker.

Reverse sequence to restore service through interrupter A.

Links for more interlock application scheme information:

Contents | Introduction | Symbols Legend | Scheme Book

Scheme # 25
Scheme # 26
Scheme # 27 Scheme # 28
Scheme # 29
Scheme # 30
Scheme # 31
Scheme # 32
Scheme # 33 Scheme # 34
Scheme # 35
Scheme # 35A
Scheme # 36

 Scheme # 37
Scheme # 38 Scheme # 39
Scheme # 40
Scheme # 41
Scheme # 42
Scheme # 42A
Scheme # 42B
Scheme # 43
Scheme # 43A
Scheme # 44
Scheme # 45
Scheme # 45A
 
   

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