Single Primary, Single Secondary – A single configuration transformer with only one winding in the primary side. The winding can only accept one nominal voltage.
Single Primary, Dual Secondary – A single-phase transformers that has a dual configuration. It has a dual winding and can accept two nominal voltages. This configuration helps to reduce fault current levels.
Dual Primary, Dual Secondary – A single-phase transformers has dual windings in the primary side where each winding has a tap for accepting two nominal voltages.
UL Approval – Underwriters Laboratories Inc. is a worldwide American based company that is a not for profit, independent product safety and certification organization that has been testing products for more than a century.
VDE Approval – Founded in 1920, the VDE Testing & Certification Institute is a German-based company that holds accreditations from an international and national level. They tests for electromagnetic compatibility and safety in modern electrotechnical technologies.
CSA Approval – Canadian Standards Association (CSA) is one of the leading accredited international product testing and certification companies for electrical, plumbing, mechanical, gas and more.