ABB Relion SMU615 Technical Manual page 250

Section 11
Technical data
244
Table 304: Environmental conditions
Description
Operating temperature range
Short-time service temperature range
Relative humidity
Atmospheric pressure
Altitude
Transport and storage temperature range
1) Degradation in MTBF and HMI performance outside the temperature range of -25...+55 ºC
2) For merging units with an LC communication interface the maximum operating temperature is +70 ºC
Value
-25...+55ºC (continuous)
1)2)
-40...+85ºC (<16 h)
<93%, non-condensing
86...106 kPa
Up to 2000 m
-40...+85ºC
1MRS758407 B
SMU615
Technical Manual