The TR300 is a high capacity, 300 watt magnetic transformer for our extensive range of low voltage and BKSSL® lighting products. Stainless steel, NEMA Outdoor 3R rated enclosure. [3] bottom entry 7/8" knockouts provide access to wiring compartment. Riveted, hinged cover opens vertically from bottom to top for service access. 120VAC or 277VAC input. 12VAC output (fully loaded). 0.6A (120VAC) or 0.3A (277VAC) maximum no load input current. Nema Type 3R Enclosure. UL listed to ANSI/UL Standard 1012.