The Square D™ by Schneider Electric Type TF Industrial Control Transformers provide factory installed overcurrent protection fuse blocks (two primary and one secondary). The stacked fuse blocks maintain Type T's small footprint and features while providing overcurrent protection. These transformers use low impedance windings to handle higher inrush current and still regulate voltage. This Type TF is a single phase 250VA transformer designed for 240x480VAC primary with 120/240VAC secondary. (The unit also supports 230x460VAC to 115/230VAC and 220x440VAC to 110/220VAC.) It is compliant with UL and CSA standards verified by third party UL carrying the cUL and UL labels.