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 150VA transformer designed for 240/480/600VAC primary with 100/120VAC secondary. (The unit also supports 230/460/575VAC to 95/115VAC and 220/440/550VAC to 90/110VAC.) It is compliant with UL and CSA standards verified by third party UL carrying the cUL and UL labels.