Schneider Electric 170R-801 Current Transformer

Schneider Electric's Square D 170R-801 toroidal current transformer provides an 800:5 A ratio for high‑current monitoring in 600 V systems. Featuring a round toroidal core with a 4-1/4 in (approximately 108 mm) inside diameter, it is designed to be installed around a single conductor to capture accurate current signals for meters and protective relays. The device operates over a frequency range of 25 to 400 Hz, making it suitable for varying electrical environments and industrial power distribution layouts. Its nominal primary current is 800 A with a 5 A secondary output, and it carries a 600 V rating on the primary side. For metering accuracy, the 170R-801 is specified to ANSI metering accuracy class 0.3 at 60 Hz, and its protective-relay class is C10, aligning with common protection schemes at this ratio. This model is part of Schneider Electric’s Square D family of current transformers, designed to interface with standard 5 A secondary circuits and measurement instrumentation. Typical applications include monitoring feeder currents in switchgear and distribution panels, supplying input to metering systems, and providing reliable current measurements for protection relays in industrial or commercial power networks.