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Insulating measure
E
F
Busbar isolation
Note
The distance specifications for busbar isolation apply to the 3VA27 molded case circuit breaker.
4.2.3
Armature plates
The electrodynamic forces that arise during a short-circuit can result in high mechanical loads in
and on the switchboard. To minimize the effects, armature plates must be mounted in the
vicinity of the terminals of the circuit breaker.
Busbars
The following diagram shows the distance of the first armature plate depending on the
prospective short-circuit current when busbars are used:
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
4.2 Power supply, grounding, and connection
Article No.
3VW9723-0WF30
3VW9724-0WF40
3VA27
≤ 415 VAC
> 415 VAC
Application planning
contained in
3VW9011-0AL71
3VW9011-0AL72
3VW9011-0AL71
3VW9011-0AL72
3VW9011-0AL73
3VW9011-0AL74
3VW9011-0AL77
3VW9011-0AL78
A
250 mm
[9.84 in]
400 mm
[15.75 in]
149
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