... weight, easy to install and anti-tamper, welcomedy the majority of the electricity sector, enhance supply management.Three-phase four-wire ... , three PT winding are connect as Y/Y shape, the primary winding of 3 CT are connect to phase A, B, C ... separately.2. Model Description3. Condition of Usea. Ambient Temperature: Highest +45 ,daily average +30 , lowest -45b ...