Siemens SENTRON 3VL series - Derating Factors; Use at Altitudes above 2000 Meters

Technical data
11.4 Derating factors
3VL IEC molded case circuit breakers
142 System Manual, 11/2013, 110 0110 - 02 DS 03
11.4
Derating factors
The tables for derating factors apply for 3VL molded case circuit breakers used under
difficult operating conditions in the following areas:
11.4.1
Use at altitudes above 2000 meters
Table 11- 15 Derating factors for high altitudes
Molded
case circuit
breaker
Characteristic values
Altitude (m)
2000
3000
4000
5000
6000
7000
8000
All
Breaking capacity I
CU
/I
CS
1,0
0,9
0,8
0,7
0,6
0,5
0,4
Operating voltage U
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
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)
Thermal-magnetic releases only
See also
Use in unusual environments: (Page 67)