Transformer Sitas- Phases: 3- PN/PN(S6)(KVA): 1 /3,5- UPRI(V): Y500-400/D289-230- USEC(V): Y 400 / D 230- ISEC(A): 1,44-2,50- F(HZ): 50..60- VECTOR GR./Shield WNG.: IIIIII0 /0- TA/ISOKL: 40 /B- IP00- Type Of Terminals: screw/tab Connection- Installation: screw- EN 61558-2-1, -2-2, -2-4 UL/CSA-Recognized Control Circuit Transformer, isolation transformer The 4AP 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.