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New generation IZM97, 99 low voltage air circuit breaker instruction manual
MN013010EN February 2020 www.eaton.com.cn
Section 2: Receiving, handling, and installation
(T)
(5mm)
(60mm)
(W)
T = Thickness of bus bar
w = Width of bus bar
2 stacked 5mm × 60 mm bus bars to carry 800A
Example 1
Example 2
2-10 Technical data
Ambient temperature
Derating coefficients are given in the table below when the circuit breaker is operating at different internal ambient tempera-
tures inside the panel. The ambient temperature inside the panel is determined with IEC8900, 1997 calculation methods or
equivalent methods.
Rated currents of the circuit breakers at different ambient temperature
Continuous
current A
Breaker model
Ambient temperature (°C)
40
45
50
55
60
70
IZM97 800A
800
800
800
800
800
800
IZM97 1000A
1000
1000
1000
1000
1000
1000
IZM97 1250A
1250
1250
1250
1250
1100
1000
1250
1250
1250
1250
1250
1250
IZM97 1600A
1600
1600
1600
1600
1500
1350
1600
1600
1600
1600
1600
1600
IZM97 2000A
2000
2000
2000
1900
1800
1650
2000
2000
2000
2000
2000
2000
IZM97 2500A
2500
2500
2500
2500
2500
2500
IZM97 3200A
3200
3150
3100
3000
2800
2550
IZM99 4000A
4000
4000
4000
4000
4000
4000
IZM99 5000A
5000
5000
5000
5000
5000
5000
IZM99 6300A
6300
6300
6200
6000
5600
5100
Max. operating current A
(ambient temperature 40°C)
Circuit breaker frame size
(IZM97, 99)
Recommended bus bar quantities and sizes
(mm)
(I
n
)
800
08
(2) 5 x 50
(1) .25 x 3.0
1000
10
(2) 5 x 60
(2) .25 x 2.0
1250
12
(2) 5 x 80
(2) .25 x 3.0
1600
16
(2) 5 x 100
(2) .25 x 3.0
2000
20
(3) 5 x 100
(3) .25 x 3.0
2500
25
(4) 5 x 100
(4) .25 x 3.0
3200
32
(3) 10 x 100
(3) .25 x 6
4000
40
(4) 10 x 100
(4) .25 x 6
5000
50
(5) 10 x 100
(5) .25 x 6
6300
63
(6) 10 x 100
(6) .25 x 6
Bus bar dimensions
The bus bar sizes are shown in the table below. This table uses data specified by IEC 60947-1 or obtained by Eaton in their
circuit breaker testing. They are 3-meter-long bus bars with the faces vertical and painted flat black. For other bus bar con-
figurations, larger bus bar sizes may be required or the breaker may have to be de-rated. Refer to the table (Rated currents
of the circuit breakers at different ambient temperature) presented in this section for de-rating information at higher ambient
temperature. Two example diagrams are recommended below.