Fuse switch disconnector H 27 F-SuT

medium-voltage3-poleindoor

The use of switchgear under normal operating conditions is specified in the EN 62271-1 as follows: • The maximum ambient temperature is 40 °C, the average value over a period of 24 h is max. 35 °C. The minimum ambient temperature is –5 °C. For our indoor switches the class "Minus 5 indoors” is speci- fied. • Solar radiation has no significant impact. • The altitude at the place of installation is max. 1000 m above sea level. • The ambient air is to have no significant contamina- tion through dust, smoke, corrosive and/or flamma- ble gasses, fumes or salts. • The following conditions apply with regard to humidity:- average value of relative air moisture measured over 24 h is max. 95 %, - average value of water vapour pressure over 24 h is max. 2.2 kPa; - average value of the relative air moisture over a period of one month is max. 90% - average value of the water vapour pressure over one month is max. 1.8 kPa;