Technical data
12.5 Derating factors
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
161
Plug-in or withdrawable version:
Table 12- 22 Derating factors Thermomagnetic overcurrent trip units (plug-in or withdrawable version
Trip unit
Thermomagnetic TM
Coefficient
at
Circuit
breaker
From [A] To [A] 40 °C 50 °C 60 °C 70 °C
VL160X 16 40 1 1 1 1
VL160 &
VL160X
50
125
100
160
1
1
1
0,9
1
0,9
1
0,9
VL250 200 250 1 0,9 0,9 0,9
VL400 200
315
250
400
1
1
1
0,9
1
0,9
1
0,9
VL630 315
500
400
630
1
1
1
0,85
1
0,85
1
0,85
Example for VL250:
● I
n
= 200 A at 50 °C
● Ambient temperature = 60 °C
I
n
= 200 x 0.93 = 186 A for fixed-mounted version
I
n
= 200 x 0,93 x 0.9 = 167 A for plug-in version
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