Armature Plates - Siemens SENTRON 3WL10 Series Manual

Application planning
4.2 Power supply, grounding, and connection
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:
①
②
Cables
If cables are used in the installation, the armature plates must be mounted at a distance of
150 mm from the connection.
122
Distance of the first armature plate to the terminals of the circuit breaker
Prospective short-circuit current
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01