Siemens SENTRON 3WL10 - Current Reduction Depending on the Ambient Temperature on the 3 VA27

Note
All values refer to the withdrawable breakers and 󹪝xed-mounted breakers and to the conductor
cross-sections stated in the table in Section Installation in the switchboard (Page 138) and to the
overriding standard IEC60947.
The values do not apply to all mounting conditions for circuit breakers and may deviate
depending upon factors such as packing density, ventilation, internal separation of the
installation, etc.
Please observe the applicable overriding guidelines (e.g.IEC61439).
4.1.5.2 Current reduction depending on the ambient temperature on the 3VA27
Fixed-mounted
for
• Rear vertical main circuit connection
• Broadened bus connectors
• Front circular conductor terminal for CuAl cables (4x240mm²)
Rated opera‐
tional cur‐
rent I
n
[A]
Min. cop‐
per cross
section
[mm
2
]
Ambient temperature
< 40 °C 45 °C 50 °C 55 °C 60 °C 65 °C 70 °C
800 500 800 800 800 800 800 778 755
100% 100% 100% 100% 100% 97% 94%
1000 600 1000 1000 1000 1000 1000 949 894
100% 100% 100% 100% 100% 95% 89%
1250 800 1250 1250 1250 1250 1192 1131 1066
100% 100% 100% 100% 95% 90% 85%
1600 1000 1600 1600 1537 1470 1403 1329 1255
100% 100% 96% 92% 88% 83% 78%
for
• Straight bus connectors extended
• Rear horizontal main circuit connection
Rated opera‐
tional cur‐
rent I
n
[A]
Min. cop‐
per cross
section
[mm
2
]
Ambient temperature
< 40 °C 45 °C 50 °C 55 °C 60 °C 65 °C 70 °C
800 500 800 800 800 800 800 750 700
100% 100% 100% 100% 100% 94% 88%
Application planning
4.1Types of installation and installation locations
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
134 Equipment Manual, 10/2023, L1V30499596002-03