Siemens SENTRON 3VL - 12.5 Derating factors

Technical data
12.5 Derating factors
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
159
12.5 Derating factors
The tables for derating factors apply for SENTRON VL used under difficult operating conditions in the
following areas:
Use at altitudes above 2000 meters
Table 12- 20 Derating factors for high altitudes
Circuit
breaker
Characteristic
values
Altitude (m)
2000 3000 4000 5000 6000 7000 8000
Switching capacity
I
CU
/I
CS
1,0 0,9 0,8 0,7 0,6 0,5 0,4
Operating voltage
V
max
1,0 0,9 0,8 0,7 0,6 0,5 0,4
Operating current
I
max
1)
1,00 0,96 0,92 0,88 0,84 0,80 0,76
All
Set current I
r
2)
1,00 1,02 1,04 1,06 1,08 1,10 1,12
1)
At max. ambient temperature 50 °C
2)
Thermomagnetic trip units only