28
Air Circuit Breakers
BT2 series
Technical data
Power consumption and derating coefficient
Derating for high-elevation
• Power consumption (Environment tempe40°C)
Power consumption is the overall consumption measured
under with the circuit breaker is electrified with current below
frame current.
If elevation exceeds work environment 2000m, electric
property of circuit breaker can correct according to following
table:
• Derating coefficient
The following table shows continual current-loading
capacity of circuit breakers at different ambient environment
temperature and under the conditions of the satisfaction of
conventional heating in IEC60947-2
Type
Three poles/four poles (W)
Fixed type
Draw-out type
BT2-1600
152
408
BT2-2000
203.6
382.8
BT2-2500
356.8
823.4
BT2-4000
648.96
897.6
BT2-6300
1050.1
1200.2
Ambient Environment temperature
+40°C
+45°C
+50°C
+55°C
+60°C
Continual current-loading
capacity
Inm=1600A
1Inm
0.99Inm
0.96Inm
0.90Inm
0.87Inm
Inm=2000A
1Inm
0.97Inm
0.91Inm
0.87Inm
0.82Inm
Inm=2500A
1Inm
0.96Inm
0.90Inm
0.86Inm
0.80Inm
Inm=4000A
1Inm
0.95Inm
0.89Inm
0.85Inm
0.78Inm
Inm=6300A
1Inm
0.93Inm
0.87Inm
0.82Inm
0.75Inm
elevation (m)
2000
3000
4000
5000
Power-frequency withstand voltage (V)
3500
3150
2500
2000
Correction factor of operational current
1
0.93
0.88
0.82
Correction factor of short-circuit breaking capacity
1
0.83
0.71
0.63