ACA5-20RM Datasheet, PDF (2/5 Pages) Murata Power Solutions Inc. – True-rms-AC Ammeters with 5A CT Inputs

Performance/Functional Specifications
Typical at TA = +25°C, unless otherwise noted.
Full-Scale Primary Current ~
Min. Typ. Max.
Units
All Models
– – 5.0 rms Amps
Overcurrent Rating 
1.5 x Rated full-scale rms current
Display Readings with 5A Flowing through the Ammeter’s Current Transformer
Model Number
Display Reading
ACA5-20RM-3-ACX-RL
100.0
ACA5-20RM-5-ACX-RL
199.9
ACA5-20RM-9-ACX-RL
500
Performance
Sampling Rate
2.5 Samples per second
Accuracy €
±0.4%FS ±3 Counts with 60Hz
Sine-Wave Input
Input Frequency Range
47–63
Hz
Measurement Type
rms Responding, Crest Factors of 1-5
Temperature Drift (0 to 60 °C)
– ±0.2 ±0.4 Cnts/°C
Zero-Current Reading (within 30 sec.) –001 000 001
Cnts
Breakdown Voltage
2000 –
–
Vdc
Power Supply Voltage
ACA5-20RM-X-AC3-RL
85 120 140 Vac/47-63Hz
ACA5-20RM-X-AC4-RL
170 220 264 Vac/47-63Hz
Power Supply Current 
ACA5-20RM-X-AC3-RL
— 30 50 mA/47-63Hz
ACA5-20RM-X-AC4-RL
— 30 50 mA/47-63Hz
Power Supply Terminal Block (all models)
Wire Size
16-22AWG, Solid or stranded
Insulation Strip Length
0.250 inches
Screw Tightening Torque
3.6 pounds-inches (0.4Nm)
Rated Voltage
310Vac
Display
Display Type and Size
3½ Digit Red LED, 0.37”/9.4mm High
Overrange Indication
“1___”
Display Reading/Decimal Point
Model dependent; see
“Display Readings” above
Physical/Environmental
Operating Temperature
0 – +60
°C
Storage Temperature
–40 – +75
°C
Humidity (non-condensing)
– – 85
%
Dimensions
Model dependent, see page 4 & 5
Weight
All models
1.1 Ounces (31 grams) nominal
ACA5-20RM Series
True-rms-AC Ammeters with 5A CT Inputs
~The specified full-scale current is the ac current circulating through the meter’s
built-in 5A current transformer’s primary circuit L1 (i.e., the external current
transformer’s 0-5A output current).
 The overcurrent rating of 1.5 times the rated full-scale current is a continuous
rms rating and applies to the current passing through the built in current trans-
former (CT). Accuracy is only guaranteed up to the rated full-scale CT current of
5Arms.
€ Specified accuracy applies to inputs with crest factors (CF) up to 2.0, where CF
= Vpeak/Vrms. Crest factors of 2 to 5 introduce an additional error of ±3% of full
scale. Ammeters are calibrated with a 5.00Arms/60Hz current flowing through
the ammeter’s built-in 5A CT.
 All specified maximum power supply currents are steady state; larger surge
currents can occur at initial turn-on.
Ordering Information
ACA5-20RM-3-AC3-RL-C 100.0A Range, 85-140Vac power
ACA5-20RM-3-AC4-RL-C 100.0A Range, 170-264Vac power
ACA5-20RM-5-AC3-RL-C 199.9A Range, 85-140Vac power
ACA5-20RM-5-AC4-RL-C 199.9A Range170-264Vac power
ACA5-20RM-9-AC3-RL-C 500A Range, 85-140Vac power
ACA5-20RM-9-AC4-RL-C 500A Range, 170-264Vac power
Accessory Current Transformers for above*:
7020-01038-0
7020-01040-0
39-3681409
100A Current Transformer, RoHS compliant
200A Current Transformer, RoHS compliant
500A Current Transformer, not RoHS compliant
* See data sheet titled “Current Transformers” at www.murata-ps.com for more
information
TECHNICAL NOTES
IMPORTANT! To ensure safe and reliable operation, ACA5-20RM
ammeters must be installed and serviced by qualified technical
personnel. Contact Murata Power Solutions if there is any doubt
regarding ammeter installation and/or operation.
1. Measurement Type: ACA5-20RM ac ammeters employ a true rms
input circuit to measure the output of external 5A current transform-
ers. Stated accuracy specifications are measured using a sine-wave
current at, or close to, the full-scale input range, at nominal line
frequency of 60Hz.
2. Calibration: Periodic recalibration of ACA5-20RM ammeters is
not required under normal, indoor operating environments. If user
calibration is necessary, it should be performed by qualified technical
personnel. Calibration is performed with potentially lethal voltages
applied to the ACA5-20RM and its associated wiring, with 5.0 amps
flowing through the ammeter’s built-in toroid sensor. A plastic,
fully-insulated adjusting tool must be used to access the calibration
potentiometer located on the back of the meter (see Mechanical
Specifications). Contact MPS if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
ACA5-20RM ammeters.
www.murata-ps.com
Technical enquiries email: [e-mail], tel: [phone]
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