12
IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 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, 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
IZM63 5000A
5000
5000
5000
5000
5000
5000
IZM63 6300A
6300
6300
6200
6000
5600
5100
Max. operating current A
(ambient temperature 40°C)
Circuit breaker frame size
(IZM63)
Recommended bus bar quantities and sizes
(mm)
(I
n
)
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 config-
urations, 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.