Siemens SENTRON 3VL System Manual page 166
Switching/protection devices, molded-case circuit breakers
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Also See for SENTRON 3VL:
- System manual (318 pages) ,
- Function manual (146 pages) ,
- Operating instructions manual (12 pages)
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Technical data
12.5 Derating factors
Thermomagnetic overcurrent trip unit, setting values Ir (thermal)
Table 12- 27 Derating factors for low setting values
Circuit
At 0 °C
breaker
VL160X
0,80
VL160
0,80
VL250
0,80
VL400
0,80
VL630
0,80
Table 12- 28 Derating factors for high setting values
Circuit
At 0 °C
breaker
VL160X
0,65
VL160
0,65
VL250
0,65
VL400
0,65
VL630
0,65
Example for VL250:
● I
● Setting the thermal overcurrent trip unit: 250 A
● Ambient temperature = 20 °C
● Corrected setting = 250 x 0.87 = 217 A
166
At 10 °C
At 20 °C
0,84
0,88
0,84
0,88
0,84
0,88
0,84
0,88
0,84
0,88
At 10 °C
At 20 °C
0,72
0,79
0,72
0,79
0,72
0,79
0,72
0,79
0,72
0,79
= 250 A at 50 °C
n
At 30 °C
At 40 °C
0,92
0,96
0,92
0,96
0,92
0,96
0,92
0,96
0,92
0,96
At 30 °C
At 40 °C
0,86
0,93
0,86
0,93
0,86
0,93
0,86
0,93
0,86
0,93
At 50 °C
At 60 °C
1
1,04
1
1,04
1
1,04
1
1,04
1
1,04
At 50 °C
At 60 °C
1
1,07
1
1,07
1
1,07
1
1,07
1
1,07
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
At 70 °C
1,08
1,08
1,08
1,08
1,08
At 70 °C
1,14
1,14
1,14
1,14
1,14
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