HPS SG3L0250KE D16 SNTL-G3 1 Phase 250kVA 480-120/240V Aluminum 60Hz 150C 3R Sentinel G (Gen. 3) Series Information. HPS Sentinel G general purpose distribution transformers are rated for 600 volts and below. They are generally used for supplying appliance, lighting, heating, motorized machine and power loads from electrical distribution systems.For applications involving non‑linear loads, please use HPS Sentinel K product line. Meets North American Efficiency Standards: U.S. ‑ DOE 10 CFR Part 431 (Jan 1, 2017); Canada ‑ SOR/2016‑311, Amd. 14 (Dec. 9, 2016) & ON Reg. 404/12 60 Hz frequency (some 50 Hz) Ratings from 15 to 333 kVA single phase and 15 to 1500 kVA three phase An extensive standard offer complimented by a wide variety of custom products available Copper and aluminum available Standard 150 deg C temperature rise and 220 deg C insulation class 10kV BIL on all HPS Sentinel G product UL Listed, CSA Certified Custom sizes, ratings and styles available upon request