Ambient Conditions - Siemens SENTRON 3WA1 Manual

6.4

Ambient conditions

Note
You can find information about derating in Chapter Derating in the power distribution
equipment (Page 517).
The 3WA circuit breakers are intended for operation in closed rooms and for stationary
use.
Ambient temperature
The ambient temperatures specified in Chapter Technical specifications of 3WA circuit
breakers (Page 489) for storage and operation of the circuit breakers must be observed.
Please also note with respect to operation that the display of the ETU600 electronic trip
unit switches off at temperatures below −25 °C and above +60 °C.
Pollution degree
The 3WA circuit breakers can be operated according to IEC 61010 at ambient conditions
with pollution degree 3.
Environmental conditions acc. to IEC 60721-3
Stress
Climatic
Biological
Chemical
Particles / dirt
Mechanical
If the ambient conditions exceed the specified values during transport, the protection
1)
of the device must be ensured by the packaging.
With the following restrictions:
2)
• Condensation only occasionally
• No precipitation
• No spray water from other sources
• Humidity: 10 ... 95% rel. humidity
Upper limit temperature extended to 80 °C.
3)
With the following restrictions:
4)
• No ice formation
• Upper temperature limit of +70 °C permissible with reduced performance data.
• With air pressure < 90 kPa: Reduced performance data
No salt spray
5)
Sand must not get into the devices.
6)
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
Storage
IEC 60721-3-1
1K5
2), 3)
1B2
1C2
5)
1S2
6)
1M2
Technical specifications
6.4 Ambient conditions
Transport
1)
IEC 60721-3-2
2K2
2B2
2C1
2S1
2M2
8)
Stationary use
IEC 60721-3-3
3K6
2), 4)
3B2
3C3
5)
3S2
7)
3M6
9)
507