Eaton IZM63 Instruction Manual page 17

Derating factors
IZM63 / IN63 circuit breakers can be applied at their full voltage and current ratings up to a maximum attitude of 2000 meters
above sea level. When installed at higher attitudes, the ratings are subject to correction factors. Rated short-circuit current is
not affected as long as the voltage is rated in accordance with the table below.
Power consumption data
It is recommended to use IZM63 / IN63 resistance and power consumption data table, calculated to IE (890) temperatures.
Altitude derating factors
Altitude (m) Voltage
correction
2000 1.000
2150 0.989
2300 0.976
2450 0.963
2600 0.950
2750 0.933
2900 0.917
3050 0.900
3200 0.883
3350 0.867
3500 0.850
3650 0.833
3800 0.817
3950 0.800
5000 0.700
IZM63 / IN63 resistance and power consumption data
Current Breaker frame
correction
1.000
IZM63N3..V/P50
0.998
IZM63H3..V/P50
0.995
IZM63N3..V/P63
0.993
IZM63H3..V/P63
0.990
Based on RAC/RDC = 1.30, the total loss is under the full rated current.
0.987
0.983
0.980
0.977
0.973
0.970
0.967
0.963
0.960
0.940
IZM63 / IN63 low voltage air circuit breaker MN013014EN May 2021 www.eaton.com.cn
Section 2: Receiving, handling, and installation
RDC RDC
(mW/pole) (mW/pole)
Fixed type Drawout type
4 10
4 10
4 10
4 10
AC watt loss AC watt loss
(3 pole sum) (3 pole sum)
Fixed type Drawout type
400 1000
400 1000
620 1550
620 1550
13