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This paper discusses the challenges of paralleling dual modules with special focus on the currently introduced dual modules like LinPak, nHPD2, XHP, LV/HV100, etc. Compared with IHM/IHV Modules 3 to 4 times as many modules have to be paralleled to achieve the same output power. Therefore the parallel connection will play a major role in designing high power converters, used e.g. in traction applications...