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

Application planning
4.1 Types of installation and installation locations
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
143
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 current
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 current
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%
1000 600
1000
1000
1000
971
942
885
827
100%
100%
100%
97%
94%
88%
83%
1250 800
1250
1250
1250
1184
1118
1049
980
100%
100%
100%
95%
89%
84%
78%
1600 1000
1600
1541
1481
1417
1352
1281
1209
100%
96%
93%
89%
85%
80%
76%
for
● Nut keeper kit