Low voltage dry-type distribution transformer means a distribution transformer that has an input voltage of 600 V or less, is air-cooled, and not used oil as a coolant. Square D offers offers Delta - Wye 30°Phase Shift transformers which reconfigure the harmonic models and mitigate the harmful effects of triplens. UL Listed with the following K-ratings to handle excess heat created by harmonic wave forms, K4 and K13. Available with aluminum or copper windings and 150°C or 115°C Rise with 220C insulation system. This Energy Efficient Transformer has a NEMA 2 degree of protection. This 1 phase, transformer has a rated power of 37.5 kVA@600 V primary voltage with a secondary voltage of 120/240 V with a 150 °C temperature rise. This product is made of aluminium. This product comes with an 18 month warranty.