Interlock Application Scheme # 28

Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Interrupter Switch

Scheme # 28
To prevent dropping load when shifting from one source to the other. To prevent opening both interrupter switches A and B at the same time. Permits both interrupter switches to be closed at the same time.

Interlock Application Scheme # 28 - Interrupter Switch

Interrupter switch A is shown closed and interrupter switch B is shown open. Key A-1 is held in interrupter B interlock.

1.
2.

3.

4.

Close interrupter B.
Turn key A-1 in L-C interlock on interrupter B to lock closed. Key A-1 is now free.
Insert key A-1 in L-C interlock on interrupter A and turn to unlock. Key A-1 is now held.
Open interrupter A.

Reverse sequence to restore service through interrupter B.

Links for more interlock application scheme information:

Contents | Introduction | Symbols Legend | Scheme Book

Scheme # 1
Scheme # 2
Scheme # 3
Scheme # 4
Scheme # 5
Scheme # 6
Scheme # 7
Scheme # 8
Scheme # 9
Scheme # 10
Scheme # 10A
Scheme # 11 Scheme # 12

Scheme # 13
Scheme # 14
Scheme # 15
Scheme # 16
Scheme # 17
Scheme # 17A Scheme # 18
Scheme # 19
Scheme # 20
Scheme # 21
Scheme # 22 Scheme # 23
Scheme # 24

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