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Ambient temperature
The circuit breaker can be operated in ambient temperatures from -25 °C to +70 °C. At
temperatures of up to +70 °C, too, the rated current is not reduced (derating, see below).
The display of the electronic trip units of the 6-series is active over the entire operating range.
The permissible storage temperature in original Siemens packaging is between -40 °C
and +70 °C.
Installation altitudes
An installation altitude above 2000 m can result in higher temperatures on the switching
devices. The lower density of air can significantly reduce heat dissipation. The arcing
behavior and the conductivity of the density-dependent ionized gas mixture are also less
favorable at greater altitudes. This makes it necessary to decrease rated operational voltage
and the rated uninterrupted current.
Altitude [m]
Rated voltage 440 V [V]
Rated voltage 690 V [V]
Rated uninterrupted current [% I
Rated ultimate short-circuit
breaking capacity AC I
See also
Installation in the switchboard (Page 138)
4.1.5
Current reduction
4.1.5.1
Current reduction depending on the ambient temperature on the 3WL10
The circuit breaker itself has no derating within the application temperatures.
Current
rating I
[A]
630
800
1000
1250
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
]
n
[% I
@U
]
cu
cu
e
< 40 °C
n
100%
100%
100%
100%
4.1 Types of installation and installation locations
2000
440
690
100
100
Ambient temperature
45 °C
50 °C
55 °C
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
Application planning
3000
4000
387
343
607
538
98
93
100
100
60 °C
65 °C
100%
100%
100%
100%
100%
100%
100%
100%
5000
300
470
90
100
70 °C
100%
100%
100%
100%
133
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