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Power Loss (with Ambient Temperature at +40°C)
Power loss is the total power consumption measured when the frame rating current In passes through the circuit breaker.
Breaker model
IZM61 1600A frame
IZM65 2500A frame
IZM67 4000A frame
Derating factors
When the working ambient temperature exceeds +40°C, the continuous current carrying capacity can be corrected with reference to the following table:
Model
Rated current (A)
IZM61 1600A frame
400-1250
1600
IZM65 2500A frame
400-2000
2500
IZM67 4000A frame
2000-2500
3200
4000
When the circuit breaker is installed at higher altitudes than 2000m, its electrical performance can be corrected with reference to the following table:
Altitude (m)
Power frequency voltage withstand (V)
Operational voltage
Short-circuit breaking capacity correction factor
Operating current correction factor
The derating correction factor is only for the maximum current in the frame
Recommended bus bar specifications
Rated frame current I
(A)
nm
IZM61 1600A frame
IZM65 2500A frame
IZM67 4000A frame
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 (W)
Fixed type
123.5
356.8
486.7
+40°C
+45°C
1
1
1
1
1
1
1
1
1
1
1
1
1
0.95
2000
5000
440/690
1
IZM61 1600A frame
1
IZM65 2500A frame
1
IZM67 4000A frame
1
Recommended bus bar dimensions
No. of bars
Rated current I
(A)
Horizontal outgoing
n
200
2
400
2
630
2
800
2
1000
2
1250
3
1600
3
400
2
630
2
800
2
1000
2
1250
3
1600
2
2000
3
2500
4
2000
3
2500
2
3200
3
4000
5
IZM6 Series Air Circuit Breaker Instruction Manual MN013019EN March 2023 www.eaton.com.cn
Section 3: Circuit breaker installation
+50°C
+55°C
+60°C
1
1
1
1
0.95
0.93
1
1
1
1
1
0.99
1
1
1
1
0.95
0.92
0.92
0.89
0.85
3000
4000
4500
3500
440/690
440/690
0.83
0.71
0.98
0.93
1
1
0.93
0.88
Vertical outgoing
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
2
2
3
4
Drawout type
331.5
823.4
856.8
+65°C
+70°C
1
1
0.87
0.8
1
1
0.94
0.88
1
1
0.89
0.85
0.82
0.8
4500
5000
3000
2900
440/690
440/690
0.66
0.63
0.9
0.87
1
0.97
0.85
0.82
Dimension (mm × mm)
50×5
50×5
50×6
50×10
50×10
50×8
50×10
80×5
80×5
80×5
80×5
80×5
80×10
80×10
80×10
100×5
100×10
100×10
100×10
9
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