Talema Electronic [ India ] Pvt. Ltd offers Open Wound Toroidal Power Transformer. Talema Electronic [ India ] Pvt. Ltd is an ISO 9001: 2000, ISO/TS - 16949: 2002 and ISO 14001: 2004 accredited company. The Open Wound Toroidal Power Transformer is available with two 115V, 50/60Hz primary windings suitable for connection in series to 230V supply or parallel to 115V supply. The Power Transformer has the facility of connecting Twin secondary windings in series or parallel or can be used independently.