The N-73A is a 150VA chassis-mount Isolation Power Transformer with 115V @ 50/60Hz primary and 230V series/115V parallel secondary. It is isolating equipment from direct connection to the power line. It is constructed with non-concentrically wound coils. The primary and secondary are wound on separate arbours, then assembled on a laminate core side-by-side separated by insulation. This prevents electrical connection under normal or overload conditions between the primary and secondary windings. This units is designed with 1500V isolation between winding to winding and between winding and core. Materials and construction are rated for class-B insulation system.