Room Planning; Operating Conditions; Vacuum Circuit-Breaker Type 3Ae - Siemens NXAIR Operating Instructions Manual

4.7

Room planning

According to chapter 5 in the Installation Instructions with order number: 110-0084.9
4.8

Operating conditions

NXAIR switchgear is designed for normal indoor operating conditions according to IEC 62271-1.
In this respect, the following limit values for the ambient air temperature must be complied with:
Limit value
Maximum value
Minimum value
Maximum value of 24-hour mean
The site altitude is maximum 1000 m above sea level as a standard level.
When NXAIR switchgear is used in regions with high air humidity or considerable temperature fluctuations,
there is risk of condensation. The formation of condensation should be an exception under normal operating
conditions. To prevent condensation, rusting or other serious consequences, the associated preventive
measures must be taken by installing electrical heating equipment in the switchgear. The ambient air must
not be significantly polluted by dust, smoke, corrosive and/or flammable gases, vapors or salt.
* If NXAIR is used under other service conditions than normal service conditions acc. to IEC 62271 Part 1
regarding the ambient air temperature, the permissible current ratings of feeder and busbar can deviate. In
this case please contact the regional Siemens representative to clarify permissible current values.
4.9

Vacuum circuit-breaker type 3AE

The vacuum circuit-breaker type 3AE is a 3-pole indoor circuit-breaker for ratings from 7.2 kV to 17.5 kV.
Available circuit-breakers type 3AE depending on the design of the NXAIR switchgear:
Fig. 2: 3AE1 circuit-breaker
A rating plate (1) is provided on the operating mechanism unit of every circuit-breaker type 3AE.
110-0134.9 / 14
Temperature [ºC]
+40*
−5*
+35*
Fig. 3: 3AE5 circuit-breaker
NXAIR / ≤ 40 kA
Technical data
17