Murata Power Solutions’ new Datel ACA-20RM series are true-RMS responding digital AC ammeters with built-in current transformers (CTs). They are able to provide direct measurement of the true-RMS values of complex, non-sinusoidal AC currents of between 2 A and 50 A. Suitable for use in the latest computer and telecoms equipment, the compact, self-powered, single-board modules feature a large, easy-to-read LED display and provide a suitable replacement for analog panel meters.
The Datel ACA-20RM series comprises five models with current ranges of 0–0,2 A (0,1 mA resolution), 0–2 A (0,001 A resolution), 0–20 A (0,01 A resolution), 0–30 A (0,1 A resolution) and 0–50 A (0,1 A resolution). The modules are self-powered with both 120 V (85-140 V a.c.) and 220 V (170-264 V a.c.) versions available, consuming less than 50 mA.
The onboard, miniature, high turns-ratio CTs provide an accurate and straightforward way to measure AC load currents. The 50 A model features an over-sized split core transformer to ease installation and accommodate wires up to 21,1 mm². All ammeters utilise low power consumption, bright red LED displays with easy-to-read 9,4 mm high characters.
The completely self-contained design of the modules enhances reliability and means that no external components are required. Precision auto-zeroing circuitry, very stable components and an RMS-to-DC converter circuit combine to give the Datel ACA-20RM series excellent performance.
A built-in bezel/filter assembly with metal fasteners allows straightforward assembly of the new ammeters into customer applications. All models use UL and CSA recognised components and have overall dimensions of 46,38 x 32,51 mm. Operating temperature range is 0°C to +60°C.
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