Murata Power Solutions announced the ACM3P series of low profile 3-phase AC digital ammeters suitable for front panel mounting. Capable of high precision measurement to within 0.1A and display of true-rms values of 2- or 3-phase mains current up to a maximum of 100A per phase, the ammeter has three built-in current transformers. Line and phase currents from 480VAC can be measured, with peak capability of 150A. The series can accurately display true-rms values of triangle, square and other irregularly shaped AC current waveforms. Measurement accuracy is ± 1% of full scale.

Accepting a universal 85 - 264VAC/47 – 63Hz supply input the series is suitable for 3-phase current monitoring requirements worldwide. Accommodated in a single vibration resistant polycarbonate housing measuring 53.3mm x 36.3mm x 28.2mm, the ammeter is ideal for mounting in vertical ‘0U’ or horizontal ‘1U’ rack spaces. The ACM3P uses a 9.2 mm low power LED display that is available in a choice of red, blue or green.

A front panel selector switch allows the user to quickly cycle through each of the three phase currents under measurement. The series is suitable for test, instrumentation and energy metering applications. A low power microcontroller is used for measurement, and together with low power LED displays ensures that the ammeter consumes very little power, typically less than 0.5 W from a 240 VAC supply. No additional components are required.