9
EATON
www.eaton.com
Power loss (at ambient temperature of +40°C)
Power loss is the total power consumption measured when the rated current of frame level (I
n
) passes through the circuit breaker.
Power loss (W)
Breaker model
Fixed type
Drawout type
IZM65 2500A frame
356.8
823.4
IZM67 4000A frame
486.7
856.8
IZM69 6300A frame
787
1145
Derating factors
When the working ambient temperature is greater than +40°C, the continuous current carrying capacity can be corrected with reference
to below table:
Model
Rated current (A)
+40°C
+45°C
+50°C
+55°C
+60°C
+65°C
+70°C
IZM65 2500A frame
400-2000
1
1
1
1
1
1
1
2500
1
1
1
1
0.99
0.94
0.88
IZM67 4000A frame
2000-2500
1
1
1
1
1
1
1
3200
1
1
1
0.95
0.92
0.89
0.85
4000
1
0.95
0.92
0.89
0.85
0.82
0.8
IZM69 6300A frame
4000-5000
1
1
1
1
1
0.95
0.9
6300
1
1
0.98
0.93
0.89
0.85
0.82
When the attitude is higher than or equal to 2000 meters at the installation site, the electrical performance of the circuit breaker can be
corrected with reference to below table:
Altitude (m)
2000
3000
4000
4500
5000
Power frequency voltage withstand (V)
5000
4500
3500
3000
2900
Short-circuit breaking capacity correction
factor
1
0.83
0.71
0.66
0.63
Operating current correction factor
IZM65 2500A frame
1
1
1
1
0.97
IZM67 4000A frame
1
0.93
0.88
0.85
0.82
IZM69 6300A frame
1
0.98
0.93
0.9
0.87
The derating correction factor is only for the maximum current in the frame
Recommended bus bar specifications
Recommended bus bar dimensions
No. of bars
Rated frame current I
nm
(A)
Rated current I
n
(A)
Horizontal outgoing
Vertical outgoing
Dimension (mm × mm)
IZM65 2500A frame
400
2
/
80×5
630
2
/
80×5
800
2
/
80×5
1000
2
/
80×5
1250
3
/
80×5
1600
2
/
80×10
2000
3
/
80×10
2500
4
/
80×10
IZM67 4000A frame
2000
3
2
100×5
2500
2
2
100×10
3200
3
3
100×10
4000
5
4
100×10
IZM69 6300A frame
4000
4
/
100×10
5000
6
/
100×10
6300
10
/
100×10
The copper bar specifi cations used in the table are when the circuit breaker is at the ambient temperature of up to 40 °C and installed in an open area, in accordance with the
conventional thermal conditions in GB14048.2.
Power loss
Derating factors
Copper bar specification
Instruction Leafl et
Effective September 2022
IZM6 Series Air Circuit Breaker
Operating Instruction Leafl et