Current Reduction Depending On The Ambient Temperature On The 3Va27 - Siemens SENTRON 3WL10 Equipment Manual

Application planning
4.1 Types of installation and installation locations
Note
All values refer to the withdrawable breakers and fixed-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
[A]
800
1000
1250
1600
for
• Straight bus connectors extended
• Rear horizontal main circuit connection
Rated opera‐
tional cur‐
rent I
[A]
800
134
Min. cop‐ Ambient temperature
per cross
< 40 °C
section
n
[mm 2 ]
500
100%
600 1000
100%
800 1250
100%
1000 1600
100%
Min. cop‐ Ambient temperature
per cross
< 40 °C
section
n
[mm ]
2
500
100%
45 °C 50 °C
800 800 800
100% 100%
1000 1000
100% 100%
1250 1250
100% 100%
1600 1537
100% 96%
45 °C 50 °C
800 800 800
100% 100%
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
55 °C 60 °C
800 800
100% 100%
1000 1000
100% 100%
1250 1192
100% 95%
1470 1403
92% 88%
55 °C 60 °C
800 800
100% 100%
Equipment Manual, 10/2023, L1V30499596002-03
65 °C 70 °C
778 755
97% 94%
949 894
95% 89%
1131 1066
90% 85%
1329 1255
83% 78%
65 °C 70 °C
750 700
94% 88%