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ACA-20RM-ALM Series True-rms-AC Ammeters with Alarm Function


ACA-20RM-ALM series ammeters from Murata Power Solutions are ideal upgrades for today's sophisticated instrumentation


ACA-20RM-ALM Series AmmetersMurata 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

Features
  • User-settable, visual alarm function
  • Flashing display indicates overcurrent faults
  • Measures the true-rms value of complex AC current waveforms
  • Ideal for measuring current in sensitive IT applications
  • Available in two input ranges: 0A to 30.0A and 0A to 50A
  • Includes built-in current transformers
  • 50A model features convenient split-core CT
  • Easy-to-read, red LED display with 0.37"/9.4mm high digits
  • Two AC power options: 85VAC-140VAC and 170VAC-264VAC (50/60Hz)
  • 2000V isolation between AC supply and load conductor

Digi-Key P/N Murata P/N Description
811-1980-ND ACA-20RM-4-AC3-RL-ALM-C AMMETER AC 50A 120V W/ALARM RED
811-1981-ND ACA-20RM-4-AC4-RL-ALM-C AMMETER AC 50A 220V W/ALARM RED
811-1982-ND ACA-20RM-5-AC3-RL-ALM-C AMMETER AC 30A 120V W/ALARM RED
811-1983-ND ACA-20RM-5-AC4-RL-ALM-C AMMETER AC 30A 220V W/ALARM RED