Technical data
12.5 Derating factors
3VL molded-case circuit breakers
164 System Manual, 03/2009, 110 0110 - 02 DS 01
Electronic trip unit
Fixed mounting:
Table 12- 25 Derating factors for electronic trip unit (fixed mounting)
Max. rated uninterrupted current according to the
ambient temperature x I
n
Circuit
breaker
I
n
At 50 °C
[A]
Cross-
section Cu
[mm
2
]min
Cross-
section Al
[mm
2
]min
40 °C 50 °C 60 °C 70 °C
VL160 63
100
160
16
35
70
25
50
95
1
1
1
1
1
1
1
1
1
0,80
0,80
0,80
VL250 200
250
95
120
120
185
1
1
1
1
1
0,95
0,80
0,80
VL400 315
400
185
240
2x120
2x150
1
1
1
1
1
0,95
0,80
0,80
VL630 630 2x185 2x240 1 1 0,95 0,80
VL800 800 2x50x5 1 1 0,95 0,80
VL1250 1000
1250
2x60x5
2x80x5
1
1
1
1
1
0,95
0,80
0,80
VL1600 1600 2x100x5 1 1 0,95 0,80
Note
The electronic trip units with the ordering data Sx, Mx, Tx and Nx have a thermal self-
protection feature that trips the breaker if the electronics components reach 100°C.
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