... ,airport,station,wharf,enterprise,tunnel,etc.It is mainly used in power supply occasions of AC 50-60HZ and ... according to usersrequirements. Working condition1.Ambient temperature:-15-+402.Altitude:<1000m3.Relative humidity:<90%4.Environnment exists with out gas,steam,chemical ... , airport, station, wharf, enterprise, tunnel, etc. It is mainly used in power supply occasions of AC 50~60Hz and voltage ...