True-RMS-AC Ammeters with Built-in CT FEATURES  Built-in CTs provide true-rms values of complex waveforms  Perfect for measuring AC current in IT applications  ranges measure: 0-0.2A, 0-2A, 0-20A, 0-30A Five and 0-50A  models features a split-core CT for easy installation 50A  Self-powered from 85-140Vac or 170-264Vac  Large, easy-to-read, red LED display with 0.37" digits  Reliable single-board construction  Digital replacement for analog meters  Approvals to UL/cUL/IEC/61010-1 Murata Power Solutions’ new ACA-20RM Series are the world’s first digital ac-ammeters to incorporate a built-in current transformer (CT) to directly measure the true-rms value of complex, non-sinusoidal ac currents from 2 to 50A – no bulky and expensive 5A “donut” CTs are required! Operation and setup is straightforward: simply pass the load-carrying wire through the on-board CT, apply power, and the ammeter is fully operational. Five input ranges measure 0-0.2 amps (0.1mA resolution), 0-2 amps (0.001A resolution), 0-20 amps (0.01A resolution), 0-30 amps (0.1A resolution) or 0-50 amps (0.1A resolution). The 50A model features an oversized split-core current transformer that easily accommodates wires sizes up to 4 AWG (21.2mm2). Two power supply options are available: 85-140V (47-63Hz), and 170-264V (47-63Hz). All models are totally self-contained; no external components are required. Power consumption from a nominal 120V or 220V ac supply is less than 50mA. And, precision autozeroing circuitry, 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. ACA-20RM Series ammeters feature full-size, 0.37" (9.4mm) high, 3½ digit, bright red LED-displays and a built-in bezel/filter assembly that features metal fasteners. They are panel-cutout compatible with MPS’s DMS-20 Series of ac voltage and frequency monitors, making ACA-20RM ammeters perfect replacements for older, less reliable, analog panel meters in today’s sophisticated IT instrumentation. RMS-to-DC CONVERTER BUILT-IN CURRENT TRANSFORMER POWER CONVERTER For full details go to www.murata-ps.com/rohs MEASURED AC LOAD CURRENT

Mu rata Power Solutions ACA-20RM SeriesTrue-RMS-AC Ammeters with Built-in CT Input Range: Performance/Functional Specifications Typical at Ta = +25°C, unless otherwise noted. © Specified full-scale currents are those passing through the ammeter's built-in current transformer's primary load-circuit. See Notes 2 and 3 below for additional model-specific information. © The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating and applies to the current passing through the built in current transformer only, it does not apply to any external circuit-wiring or external loads....

ACA-20RM Series True-RMS-AC Ammeters with Built-in CT The calibration potentiometer has approximately ¾ of a turn of rotation; do not force its adjustment screw past the end stops. Contact MPS if additional information is required regarding calibration, setup, or any other technical issue pertaining to ACA-20RM ac ammeters. 3. Wire Gauges and Fusing: Wires specified in the Functional Specifications section must be used for making connections to ACA-20RM series ammeters. All power-supply and load wiring must be rated for the supply voltages and currents they will conduct and must comply with any...

ACA-20RM Series True-RMS-AC Ammeters with Built-in CT PANEL INSTALLATIONS All connections to ACA-20RM Series ammeters must be made after the ammeter is securely attached to its panel and with all associated load and supply voltages de-energized (off). However, using extreme caution and observing all safety measures applicable to the user’s installation, 50A split-core CT models can be connected to energized current-carrying load conductors, but connections to TB1 must always be made with the ammeter’s power source off. Using Figure 4 as a guide, carefully insert the bezel/color filter assembly...

ACA-20RM Series True-RMS-AC Ammeters with Built-in CT MECHANICAL SPECIFICATIONS Lead Length 2.0 (50.5) min. 0.35 (8.9) Diameter MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) 1. Description of safety marks: Caution, risk of electrical shock Caution, risk of danger Equipment is protected throughout by double or reinforced insulation 2. Cleaning Instructions: Gently clean with dry cloth only. 3. Caution: if the equipment is used in a manner not specified by Murata Power Solutions, the protection provided by the equipment may be impaired. Murata Power...