Current Transformer

Onset has introduced a series of high-performance, revenue-grade, split-core current transformers for measuring alternating current and amperage in -commercial-building-energy audits, building-commissioning studies, and other applications. The Accu-CT Series current sensors, manufactured by Continental Control Systems and sold through Onset, are available in 20-, 50-, 100-, and 250-A models, all offering one–handed operation even while wearing safety gloves. The transformers feature a 0.75-in. window opening and high accuracy over a full temperature range and to 1% of rated current. A burden resistor is built in, and the Accu-CT features a 333‑mVac voltage output at rated full-scale current, with no shorting blocks needed.

Onset’s Accu-CT current transformers are available in four models



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