Siemens NXAIR Operating Instructions Manual page 90

Operating the circuit-breaker panel
Mechanical coding
The low-voltage connections are coded with regard to specific current ratings. In the case of circuit-breaker
panels, the coding comprises also the specific control functions of a panel version.
The 4 coding pins (1) on the low-voltage plug connection prevent plugging on the low-voltage connector of
a panel which is not suitable for the particular switching-device truck.
1
Fig. 149: Low-voltage plug connection
Coding symbols
On the top side of every switching-device truck (2) and on the top side of every low-voltage connector (6)
there are 2 or 3 coding symbols respectively. A switching-device truck may only be inserted in a panel, if
the coding symbols are identical in number and kind with those on the low-voltage connector.
Fig. 150: Coding symbols on low-voltage connector and switching-device truck
90
1
2
5
3 4
6
NXAIR / ≤ 40 kA
Top side of
(2)
switching-device truck
Coding symbol for
(3)
electromagnetic interlock
Coding symbol for
current rating
(4)
(circuit-breaker panels:
also for control functions)
Optional:
Coding symbol for
(5) current rating
(circuit-breaker panels:
also for control functions)
Top side of
(6)
low-voltage connector
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