ElecDirect is proud to offer Control Power Transformers by Transfab Magnetic Solutions - a trusted industry name for over 20 years. The 'DO' series of Transfab transformers are a high quality 'open' style transformer with standard screw terminals. CSA and UL certified. The 'DC' series control transformers are a high quality 'enclosed' style transformer. CSA and UL certified. The DX series are a Epoxy-Potted Control Transformer in a NEMA 3R enclosure designed for indoor and outdoor use. Ideal for corrosive, damp, humid or dusty environments.