Siemens SENTRON 3VL System Manual page 165

Plug-in or withdrawable version:
Table 12- 26 Derating factors for electronic trip units (plug-in or withdrawable version)
Circuit
breaker
VL160
VL250
VL400
VL630
VL800
VL1250
VL1600
Example for VL250:
● I
● Ambient temperature = 60 °C
● I
● I
● Set I
● I
● I
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
Trip unit
Thermomagnetic TM
From [A]
63
125
200
315
1000
= 250 A at 50 °C
n
= 250 x 0.95 = 237 A for fixed-mounted version
n
= 250 x 0.95 x 0.9 = 213 A for plug-in version
n
to the next possible value
R
= 0.95 In for fixed-mounted version
R
= 0.8 In for plug-in version
R
To [A] 40 °C
100 1
160 1
250 1
400 1
630 1
800 1
1250 1
1600 1
Technical data
12.5 Derating factors
Coefficient
at
50 °C 60 °C
1 1
0,9 0,9
0,9 0,9
0,9 0,9
0,85 0,85
0,9 0,9
0,95 0,95
0,8 0,8
70 °C
1
0,9
0,9
0,9
0,85
0,9
0,95
0,8
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