Power Transformer Series: 3FD-2xx Tamura Series 3FD-2xx Power Transformers are power rated 1.1VA dual primary and operate with either a parallel input of 115V or a series input of 230V. The three-flange bobbin construction allows for low capacitive coupling. Tamura's Power Transformers feature a Hi-Pot rating of 2500Vrms, are insulated to Class B (130º), and are RoHS compliant.