This new replacement transformer is made by MoniServ. It is compatible with part number starts with 4005DXXXX. The secondary resistance is about 0.8 K between S1 and S2 (or S3 and S4). The primary resistance is about 0.5 ohm between P1 and P2 (P3 and P4). It is compatible with transformers on 4H.V1448.241 inverter.