TRANSFORMER SITAS, PHASES:3, PN/PN(S6)(KVA):0.63 /1.8, UPRI(V):Y500-400/D289-230, USEC(V):Y 400 / D 230, ISEC(A):0.9-1.57, F(HZ):50...60, SWITCHING SIZE/SHIELDING:IIIIII0 /0, TA/ISOKL:40 /B, IP00, CONNECTION:SCREW/FLAT PLUG CONNECTION, MOUNTING:SCREW, EN 61558-2-1, -2-2, -2-4 >UL/CSA-RECOGNIZEDCONTROL TRANSFORMERISOLATING TRANSFORMER< The 3-phase transformers 4AP are designed as isolating, safety or mains matching transformers with different primary and secondary voltages and vector groups. They are suitable for fuseless construction due to their low inrush current, and with Sirius 3RV circuit breakers.