ACA-20RM Datasheet, PDF (4/5 Pages) Murata Power Solutions Inc. – True-RMS-AC Ammeters with Built-in CT

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-carry-
ing load conductors, but connections to TB1 must always be made with
the ammeter’s power source off.
Care should be exercised when passing the load-carrying conductor
through the meter’s built-in CT---particularly when larger conductors are
used. The installed wire-positions should be such that minimal mechani-
cal forces are applied to the built-in CT, TB1, or to the ammeter itself. In
high-vibration environments, it is strongly recommended that adequate
strain reliefs be used for all load and supply wiring.
Using Figure 4 as a guide, carefully insert the bezel/color filter assembly
into the panel opening. From the rear of the panel, install the four round
plastic standoffs over the bezel’s threaded studs. Install the pc-board
assembly then attach and securely tighten all four hex nuts. Use only
the factory-supplied hardware as the use of substitute hardware could
result in an unsafe installation and/or adversely affect the reliability of
the ammeter itself.
The recommended range of panel thickness that can be used with the
supplied hardware is 0.040 inches (1.0mm) to 0.125 inches (3.2mm).
Panel thickness outside of this range will require additional user-supplied
hardware and/or modifications.
'ASKET
"EZEL
PANEL
 4HICK
3TANDOFF
'ASKET
.UT
!#! 2-
!#!MMETER
3TANDOFF

BEZEL AND PANEL CUTOUT
FRONT VIEW
3)$%6)%7
Figure 4. Panel Installation
0.187
(4.75)
0.55
(13.97)
RECOMMENDED DRILL AND
PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
0.116 (2.95)
1.280
(32.51)
1.07
(27.18)
0.838
(21.29)
1.826 (46.38)
1.336 (33.93)
1.626 (41.30)
0.093 (2.362) DIAMETER (4 REQUIRED)
0.145 (3.68)
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MPM_ACA-20RM_B02 Page 4 of 5