Eaton IZM32 User Manual

12 IZM32 / IN32 low voltage air circuit breaker MN013017EN May 2022 www.eaton.com
Section 2: Receiving, handling, and installation
2-10 Technical data
Ambient temperature
Derating coefficients are given in the table below when the circuit breaker is operating at different internal ambient
temperatures 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
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 configurations, 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.
Rated Current 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A
IZM32 40°C [A] 800 1000 1250 1600 2000 2500 3200 4000
50°C [A] 800 1000 1250 1600 2000 2500 3100 4000
60°C [A] 800 1000 1250 1600 2000 2500 2800 3650
70°C [A] 800 1000 1250 1600 2000 2500 2550 3500
(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
Max. operating current A
(ambient temperature 40°C)
Circuit breaker frame size
(IZM32)
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

Eaton IZM32 Specifications

General

Brand	Eaton
Model	IZM32
Category	Circuit breakers
Language	English