VPT Toroidal Power Transformers Triad Magnetics VPT Toroidal Power Transformers offer a power range up to 2.5KVA, a primary 115/230VAC and 50/60Hz and a secondary dual for parallel or series connection. The VPT series features high efficiency, low stray field, insulation for Class B 130ºC, and dielectric isolation (pri to sec) at 4KV for 60 seconds. The transformers are RoHS Compliant.