1500 m
1000 m
+25 °C +30 °C
+77 °F +86 °F
+40 °C
+104 °F
+35 °C
+95 °F
+20 °C
+68 °F
3300 ft
4921 ft
2000 m
6562 ft
2500 m
8202 ft
3000 m
9842 ft
3500 m
11429 ft
4000 m
13123 ft
1.00
0.95
0.85
0.90
0.80
Derating factor 1.00
Derating factor 0.95
Derating factor 0.90
Derating factor 0.85
Derating factor 0.80
Note: Check the supply network compatibility restrictions above 2000 m (6562 ft), see
Installation site altitude (page 300). Check also PELV limitation on relay output terminals
above 2000 m (6562 ft), see sections Isolation areas, R1…R5 (page 294) and Isolation
areas, R6…R9 (page 295).
Switching frequency derating by derating factor
The output current is calculated by multiplying the current given in the rating table by
the derating factor given in the table below.
Note: If you change the minimum switching frequency with parameter 97.02, derate
according to the table below. Changing parameter 97.01 does not require derating.
246 Technical data
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