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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Interrupter Switch
Scheme # 32
To prevent operation (closed, open, or closed) of interrupter switch when breaker is closed. To prevent opening fuse compartment door when the interrupter switch A is closed. To prevent closing interrupter switch until fuse compartment door is locked closed. Permits the breaker to be serviced and operated while the interrupter switch is locked open.

Interlock Application Scheme # 32 - Interrupter Switch

Breaker, fuse compartment door, and interrupter are shown in closed position, connected to line B. Key A-1 is held in breaker interlock and key A-2 is held in interrupter 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 open fuse compartment door:

  1.

2.

3.

4.
 Proceed from normal position with operations 1 through 4 above.
Turn key A-2 in L-O interlock on interrupter to lock open. Key A-2 is now free.
Insert key A-2 in L-C interlock on fuse compartment door and turn to unlock. Key A-2 is now held.
Open fuse compartment door.

Reverse sequence to restore service.

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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