Transformer Sitas- Phases: 3- PN/PN(S6)(KVA): 6,3 /28- UPRI(V): Y500-440-380+/-20/D289- 254-220+/-11- USEC(V): Y 400 / D 230- ISEC(A): 9,1-15,83- F(HZ): 50..60- VECTOR GR./Shield WNG.: IIIIII0 /0- TA/ISOKL: 55 /H- IP00- Type Of Terminals: Screw Connection- Installation: Screw- EN 61558-2-1, -2-2, -2-4 UL/CSA-Recognized Control Circuit Transformer, isolation transformer The 4AU 3-phase transformers are implemented as isolating, safety or matching transformers with different primary and secondary voltages and vector groups. They are suitable for a fuseless design due to their low inrush current and this is achieved with SIRIUS 3RV motor starter protectors/circuit breakers.