Altitude
Circuit breakers are designed to operate within specification at altitudes up to 2,000 m (6,600 ft.). Above 2,000 m (6,600 ft), the following derating is required:
|
Characteristic |
Altitude (m/ft) |
||||
|---|---|---|---|---|---|
|
2,000 m |
3,000 m |
4,000 m |
5,000 m |
||
|
Impulse withstand voltage |
Vimp |
8 kV |
7.1 kV 6 |
6.4 kV |
5.6 kV |
|
Insulation voltage |
Vi |
800 V |
710 V |
635 V |
560 V |
|
Maximum operational voltage |
Ve |
690 V |
690 V |
635 V |
560 V |
|
Average current capacity (A) at 40 °C (104 °F) |
In x |
1 |
0.98 |
0.96 |
0.94 |