Posted in | Ammeters

ACA5-20RM Series Ammeters from Murata Power Solutions

Murata Power Solutions’ ACA5-20RM Series accept the output of external 5A current transformers (CTs) and accurately display the true-rms value of complex, non-sinusoidal ac currents up to 500A. Operation and setup is straightforward: simply pass the external 5A CT’s secondary 0-5A output leads through the ACA5-20RM’s on-board toroid sensor, apply ac power, and the ammeter is fully operational. All models are totally self-contained—other than the external 5A CT, no other user-supplied components are required.


  • Scales and displays the true-rms output of 5A current transformers
  • Accurately measure complex ac current waveforms
  • Perfect for measuring current in IT applications
  • Available in three input ranges: 0-100A, 0 to 200A, or 0 to 500A
  • Reliable single-board construction
  • Easy-to-read, red LED display with 0.37"/9.4mm digits
  • Two AC power options: 85-140Vac & 170-264Vac (50/60Hz)
  • 2000V isolation between ac supply and external CT
  • Digital replacement for analog meters

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