Siemens NXAIR Operating Instructions Manual page 181

Mechanical coding
The low-voltage plug connector (1) of each contactor truck is coded with regard to the number of
HV HRC fuse-links used in every phase of the respective contactor and their rated currents.
The 4 coding pins (2) on the low-voltage plug connection prevent plugging on the low-voltage connector (3)
of a panel which is not suitable for this contactor.
Fig. 323: Low-voltage plug connection of
contactor truck
Coding symbols
On the top side of every low-voltage connector (4) and on the top side of every contactor truck (7) there are
two coding symbols respectively. A contactor truck may only be inserted in a panel, if both symbols on the
contactor truck are identical with those on the low-voltage connector.
110-0134.9 / 14
Operating the contactor panel with panel width 600 mm
NOTICE
Maloperation
Risk of inserting a truck into a panel not suitable for the truck type.
Verify that you have a contactor truck at hand and that the present panel
is a contactor panel.
To do so, carefully examine both the mimic diagram on the high-voltage
door and the front side of the truck.
NOTICE
Maloperation
Danger due to damaging of safety-relevant parts. Operating the switchgear with a
contactor version that is not suitable for the corresponding panel version can
cause serious damage to the switchgear.
Do not change the mechanical coding of the low-voltage connection.
Leave any information directly applied to the switchgear (labels, symbols,
imprints and the like) in as-delivered condition, and do not cover any of it.
Verify correspondence between panel version and contactor version as
regards coding and mechanical closing latch.
1
2
NXAIR / ≤ 40 kA
Fig. 324: Low-voltage connector plugged on
3
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