Square D EXN30T3H is a 30 kVA dry-type transformer rated for three-phase service that steps down a 480 V delta primary to a 208Y/120 V secondary (208 V line-to-line, 120 V line-to-neutral) to feed 120/208 V loads from a 480 V distribution. The DOE 2016 energy-efficient design uses copper windings and has an impedance of 18% (18M) with a 115°C rise, delivering reliable, compact power conversion for commercial and light-industrial applications. Common catalog variants include EXN30T3HFCU, reflecting the same 480 V delta to 208Y/120 V configuration and 30 kVA rating.
