Temperature Derating
The current rating of a high-ampere circuit breaker is highly dependent on the actual conditions of installation and connection. Thus it is not possible to give strict values of current rating without performing a temperature rise test in the actual electrical equipment configuration.
|
Temperature Correction Factors |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Maximum Ambient Temperature |
|||||||||||||
|
°C |
70 |
60 |
50 |
40 |
30 |
25 |
20 |
10 |
0 |
-10 |
-20 |
-35 |
-30 |
|
°F |
158 |
140 |
122 |
104 |
86 |
77 |
68 |
50 |
32 |
14 |
-4 |
-13 |
-22 |
|
Current |
0.75 |
0.83 |
0.92 |
1 |
1.07 |
1.11 |
1.14 |
1.21 |
1.27 |
1.33 |
1.39 |
1.42 |
1.44 |