Siemens SENTRON 3VA27 - Power Loss; Ambient Conditions

Application planning
4.1 Types of installation and installation locations
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
141
4.1.3
Power loss
To ensure the electrical switchboards have the capacity to carry rated uninterrupted current,
the power loss of the circuit breaker must be considered in planning the electrical
switchboard.
The values shown in the table refer to the total power for three and four-pole circuit breakers
with balanced loads at a current that correspond to the rated uninterrupted current I
u
at
50/60Hz.
Power loss 3WL10
I
u
630 A
800 A
1000 A
1250 A
Fixed-mounted breaker
[W]
31
50
78
122
Withdrawable breaker
[W]
62
100
156
244
Power loss 3VA27
I
u
800 A
1000 A
1250 A
1600 A
Fixed-mounted breaker
[W]
19.3
30
47
77
Withdrawable breaker [W] 35.3 55 86 141
The power losses have been calculated according to IEC 60947.
4.1.4
Ambient conditions
Pollution degree
Operation of the circuit breaker is approved in accordance with IEC / EN 60947 for pollution
degree 3.
The circuit breaker also complies with the following standards:
● IEC60721-3-6 class 6C3
● IEC60721-3-3 class 3C2
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.