|Murata Power Solutions' ACA-20RM-ALM series digital AC ammeters accurately display the true-rms value of non-sinusoidal AC currents and provide a user-settable, overcurrent alarm function. When the preset over current level is exceeded, the LED display continuously flashes from high to low intensity. All models are completely self-contained—no other user-supplied components are required. A built-in current transformer greatly simplifies most AC ammeter applications. Just pass the load conductor through the built-in current transformer, apply AC power, and the ammeter is fully operational. Input ranges available are 0 to 30.0A or 0 to 50.0A, both with 0.1A resolution. The 50A model features a convenient split-core type current transformer that can be clamped
around insulated live conductors.
Available power supply options are 85V to 140V (47Hz to 63Hz) and 170V to 264V (47Hz to 63Hz). Power consumption from a nominal 120V or 220V AC supply is less than 50mA. Super-stable components and an rms-to-DC converter circuit combine to achieve excellent performance when measuring the complex, non-sinusoidal, AC currents found in today’s computer/telecom equipment. All ACA-20RM-ALM series true-rms ammeters feature full-size, 0.37" (9.4mm) high, 3½-digit, bright red LED displays and a built-in bezel/filter assembly that includes metal fasteners. They are also panel cutout compatible with MPS’s DMS-20RM series of rms reading AC voltage monitors, making ACA-20RM-ALM ammeters ideal upgrades for today's sophisticated instrumentation. Datasheet