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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Interrupter Switch
Scheme # 31
To prevent operation (closed, open, or closed) of interrupter switch when breaker is closed. Permits the breaker to be serviced and operated while the interrupter switch is locked open.

Interlock Application Scheme # 31 - Interrupter Switch

Breaker and interrupter are shown in closed position, connected to line B. Key A-1 is held in breaker 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-C-O-C interlock on interrupter and turn to unlock. Key A-1 is now held.
Open interrupter.
Turn key A-1 in L-C-O-C interlock on interrupter 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 through either line A
or line B.

To transfer interrupter from line B to line A:

  1.

2.

3.

4.

5.
Proceed from normal position with operations as in steps 1 through 3 above.
Open interrupter switch from line B and connect
to line A.
Turn key A-1 in L-C-O-C interlock on interrupter to lock closed. Key A-1 is now free.
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 line B.

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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