Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted
Min. Typ. Max.
AC (rms) Current, L1, L2, L3 ➀
0.0 — 100.0 Amperes
Overcurrent Rating ➁
1.5 x Rated full-scale current
Current Accuracy ➂
Measurement Bandwidth (L1, L2, L3)
Temperature Drift (0 to 60ºC)
Zero-Current Reading (within 1 sec.)
Supply Voltage (TB1)
85 120 264 Vac/47-63Hz
Supply Current ➃
35 50 110
50 75 165
50 75 165
Power Supply Terminal Block (TB1)
16-22AWG, solid or stranded
Insulation Strip Length
6.4mm (0.250 in)
Screw Tightening Torque
0.4Nm (3.6 lb-in)
Display Type and Size
4 Digit LED, 9.14mm (0.36in) high
Decimal Point Selection
0 — +60
-40 — +75
0 — 85
See mechanical speciﬁcations
Weight, all models
2.6 oz (74g)
➀ Speciﬁed full-scale currents are those passing through the power meter’s built-in
current transformer’s primary load-circuit. See Notes 2 and 3 below for additional
➁ 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. Accuracy is
guaranteed up to the rated current level.
➂ Power Meters are calibrated with near full-scale 50Hz sine-wave inputs.
➃ All speciﬁed maximum supply currents are steady state. Larger surge currents can
occur at initial application of line power.
100A, 85-264Vac Supply, Red LED Display
100A, 85-264Vac Supply, Green LED Display
ACM3P-4-AC1-R-B-C* 100A, 85-264Vac Supply, Blue LED Display
*Consult factory for availability
Three-Phase AC Ammeters
IMPORTANT! To ensure safe and reliable operation, ACM3P amme-
! ters must be installed and serviced by qualiﬁed technical personnel.
Contact Murata Power Solutions if there is any doubt regarding their
installation or operation.
1. Measurement Type: ACM3P series 3-phase ammeters employ a
precision energy metering integrated circuit and a low-power micro-
controller to measure and display the rms value of 2- or 3-phase
ac-mains current. However, while the unit has an upper bandwidth
of 14kHz, dc components or frequencies below 47Hz will not be
2. Basic Operation: Upon application of ac power to TB1, the unit
will ﬁrst perform a self-test routine and then continuously display
amperes, with one of the three phase-annunciator LEDs illuminated
(L1, L2, or L3). The display will remain ﬁxed in one of these reading
modes as long as the front panel ‘SEL’ button is not touched. Assum-
ing phase L1 is initially illuminated, momentarily touching the ‘SEL’
button two times in succession will cycle the display to phase L2, and
then to phase L3. Momentarily touching ‘SEL’ a third time will return
the unit back to displaying phase L1 current.
If power is removed and then restored, the ACM3P will perform a
self-test and then return to displaying the last selected phase, i.e.,
the phase it displayed just before power was removed.
Conﬁguring for 2-Phase Operation: As shipped, ACM3P ammeters
are conﬁgured to measure and display 3-phase currents (L1, L2, and
L3 current transformers are all active). The unit can be set to display
2-phase currents (only L1 and L2 are active) by performing the fol-
A. Press and hold the SEL button for approximately ﬁve seconds and
then release the button once the words “LinE SEt” appear on the
B. Brieﬂy tapping the SEL button will alternate the display reading
between ‘2-Ph’ and ‘3-Ph’ each time SEL is tapped.
C. To change the factory default 3-phase mode to 2-phase, leave the
display ﬁxed in the ‘2-Ph’ reading for at least ﬁve seconds.
To revert the unit back to 3-phase operation simply repeat the above
procedure but, in step C, allow the unit to display a ﬁxed ‘3-Ph’ for at
least ﬁve seconds.
3. Overrange Indication: ACM3P ammeters have an overcurrent rat-
ing of 1.5 times rated current, or 150A. However, accuracy is only
guaranteed up to 100A, and the display will ﬂash on and off when the
current is at or above 120A.
4. Calibration: Due their digital design, ACM3P ammeters cannot be
calibrated in the ﬁeld. ACM3P ammeters are factory-calibrated to
meet their speciﬁed accuracies with the factory supplied current
transformers. Use of any other current transformers will produce
Contact Murata Power Solutions if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
MPM_ACM3P Series.A01 Page 2 of 6
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