Eaton IZM97 Instruction Manual page 17

Derating factors
IZM9 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 IZM9 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
New generation IZM97, 99 low voltage air circuit breaker instruction manual MN013010EN February 2020 www.eaton.com.cn
IZM97,99 resistance and power consumption data
Current Breaker frame
correction
1.000
IZM97B3C-08
0.998
IZM97N3C-08
0.995
IZM97H3C-08
0.993
IZM97B3C-10
0.990
IZM97N3C-10
0.987
IZM97H3C-10
0.983
IZM97B3C-12
0.980
IZM97N3C-12
0.977
IZM97H3C-12
0.973
IZM97B3C-16
0.970
IZM97N3C-16
0.967
IZM97H3C-16
0.963
IZM97B3C-20
0.960
IZM97N3C-20
0.940
IZM97H3C-20
IZM97B3C-25
IZM97N3C-25
IZM97H3C-25
IZM97B3C-32
IZM97N3C-32
IZM97H3C-32
IZM99N3C-40
IZM99H3C-40
IZM99N3C-50
IZM99H3C-50
IZM99N3C-63
IZM99H3C-63
Based on RAC/RDC = 1.30, the total loss is under the full rated current.
Section 2: Receiving, handling, and installation
RDC RDC
(mW/pole) (mW/pole)
Fixed type Drawout type
15 33
12 24
12 24
15 33
12 24
12 24
15 33
12 24
12 24
15 33
12 24
12 24
12 24
12 24
12 24
8 20
8 20
8 20
8 20
8 20
8 20
6 12
6 12
4 10
4 10
4 10
4 10
AC watt loss AC watt loss
(3 pole sum) (3 pole sum)
Fixed type Drawout type
40 85
35 70
30 60
60 130
50 95
50 95
90 200
70 140
70 140
150 330
120 240
120 240
190 330
190 380
190 380
200 500
200 500
200 500
320 800
320 800
320 800
380 750
380 750
400 1000
400 1000
620 1550
620 1550
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