Schneider Electric 5N-151 Current Transformer

Schneider Electric's Square D 5N-151 current transformer is a compact, general‑purpose instrument transformer that steps down high AC current to a 5 A secondary for metering and protective-relay inputs. The 150:5 A ratio means a full‑scale primary current of 150 A yields 5 A on the secondary, a 30:1 turns ratio that preserves signal fidelity while keeping it at a standard metering level. With a 2.5 VA burden rating, the CT supports a modest secondary load without sacrificing accuracy, making it suitable for use with typical relays, meters, and data loggers that accept a 5 A CT output. As part of Schneider Electric's Square D line, the 5N-151 is designed for installation in distribution panels, switchgear, and other electrical assemblies where reliable current measurement is essential for monitoring, energy management, and protection coordination. This model exemplifies Schneider Electric's instrument-transformer family, providing a proven interface between high‑current circuits and low‑current sensing equipment. For best compatibility, ensure your metering or protection devices are rated for 5 A CT inputs and verify the fit and mounting requirements with the official product literature.