
13
IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 2: Receiving, handling, and installation
Altitude (m)
Voltage
correction
Current
correction
2000
1.000
1.000
2150
0.989
0.998
2300
0.976
0.995
2450
0.963
0.993
2600
0.950
0.990
2750
0.933
0.987
2900
0.917
0.983
3050
0.900
0.980
3200
0.883
0.977
3350
0.867
0.973
3500
0.850
0.970
3650
0.833
0.967
3800
0.817
0.963
3950
0.800
0.960
5000
0.700
0.940
Breaker frame
RDC
(mW/pole)
Fixed type
RDC
(mW/pole)
Drawout type
AC watt loss
(3 pole sum)
Fixed type
AC watt loss
(3 pole sum)
Drawout type
IZM63N3..V/P50
4
10
400
1000
IZM63H3..V/P50
4
10
400
1000
IZM63N3..V/P63
4
10
620
1550
IZM63H3..V/P63
4
10
620
1550
Based on RAC/RDC = 1.30, the total loss is under the full rated current.
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
IZM63 / IN63 resistance and power consumption data