Siemens SENTRON 3VL System Manual page 161

Plug-in or withdrawable version:
Table 12- 22 Derating factors Thermomagnetic overcurrent trip units (plug-in or withdrawable version
Circuit
breaker
VL160X
VL160 &
VL160X
VL250
VL400
VL630
Example for VL250:
● I
● Ambient temperature = 60 °C
I = 200 x 0.93 = 186 A for fixed-mounted version
n
I = 200 x 0,93 x 0.9 = 167 A for plug-in version
n
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
Trip unit
Thermomagnetic TM
From [A]
16
50
125
200
200
315
315
500
= 200 A at 50 °C
n
To [A] 40 °C
40 1
100 1
160 1
250 1
250 1
400 1
400 1
630 1
Technical data
12.5 Derating factors
Coefficient
at
50 °C 60 °C
1 1
1 1
0,9 0,9
0,9 0,9
1 1
0,9 0,9
1 1
0,85 0,85
70 °C
1
1
0,9
0,9
1
0,9
1
0,85
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