The Westgate Mfg PC-1H is a 277VAC twist-lock photocell rated at 1000W, providing automatic dusk-to-dawn control for commercial outdoor luminaires wired on 277V branch circuits. Designed for direct twist-lock receptacle mounting, it operates across a temperature range of -40F to 158F for dependable year-round performance on area lights, wall packs, and pole fixtures. Plastic construction with a 2-year warranty.