1.GB/T17467 SD320 IEC61330 2.CE CQC CCC ISO9001 ISO14001 OHSAS 18001 BV 3.high ... , exhaust blower, heating and dew against device in the substation.2. Characteristic: Fastness, heat insulation, ventilation, good performance, guards against the ... frequency withstand voltagekV/minPhase-earth and phase-phase: 42/135/12.5/1Across open contacts:48/1lOkV Cable AC withstand voltage ...