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Fig.3.8
3.8
Circuit Breaker
Bo om
"A" cm
Circuit Breaker
10 cm (Min.) Cable
10 cm
3.3-01
INTRO
BREAKER
TRIP UNIT
Top
1
Circuit Breaker
LOCKS
ACCESSORIES
3.3 Interlocking of Mul ple Breakers
Mechanical interlocks are op onal devices available for
beakers in a xed or Drawout pa ern. These enable the
interlocking of 2 or 3 breakers mounted side by side or
stacked.
These devices have two parts : The rst a factory mounted
component is
ed to the chassis when in Fixed pa ern or to
the casse e when used in drawout mode. Two or more
specially designed , eld mountable cables being the second.
Any combina on ( xed or drawout), current ra ng, number of
poles or envelope size can be interlocked. Systems are
available in one con gura on for 2 breakers and in three
variants for 3 breakers.
For instruc ons on how to install and use theses device see
the separate instruc on manual DEH.......
1 of 2 breaker interlock (Type A)
With the 1 of 2 interlock in use, if one breaker is ON the
second breaker cannot be turned ON. There is no priority, if
any of the 2 breakers is ON the other cannot be turned ON.
The second breaker can be charged and ready to close, to
enable a fast transi on from one to the other breaker.
1 of 3 breaker interlock (Type B)
With the 1 of 3 interlock in opera on, if one breaker is ON the
other 2 breakers cannot be turned ON. There is no priority, if
any of the 3 breakers is ON the others are prevented. The
breakers that are not ON can be charged and ready to close,
to enable a fast transi on from one to the other breaker.
2 of 3 breaker interlock (Type C)
With the 2 of 3 interlock in opera on, one breaker is always
OFF. However, 1 or 2 of the other breakers can be ON.
There is no priority, if any 2 of the 3 breakers are ON the
remaining is prevented from being turned ON. The breaker
which is not ON can be charged and ready to close, to enable
a fast transi on.
"A" cm
2
Circuit Breaker
TESTS
APPENDIX
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