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DMS-20PC-FM Series
Self-Powered, 3-Digit LED Display
AC Line Frequency Monitors
Power Supply Polarity, Grounding, Fusing, and Wiring
1. Polarity and Grounding:
DMS-20PC-FM’s two ac-supply input terminals are not polarity sensitive, that
is, they have no “AC LO” or “AC HI” designations. These units do not include
nor require a connection to earth/chassis ground. All ac-supply wiring must be
rated for the voltages and currents they will conduct and comply with any code
or application-mandated requirements pertaining to the user’s speci?c installa-
tion. Additional model-speci?c information is provided below.
2. UL Recognized Panel Mount Models with Screw Terminals:
3. UL Listed Models with “Plug-in” Blade Terminals:
Plug-in DMS-20PC-1-FM-XF models are not internally fused and must be
protected by an external current limiting circuit breaker or fuse in accordance
with applicable regulatory codes. These models are designed to be plugged
into NEMA 1-15R, NEMA 5-15R, and NEMA 5-20R receptacles.
4. Description of the safety marks:
C
?
US E156931
Caution, risk of electrical shock
DMS-20PC-FM AC frequency meters are not internally fused. The supply
wires feeding these meters must be fused with a 0.25A/250V time delay/time
lag fuse, in accordance with applicable regulatory codes. The rear threaded
standoff input-terminals are to be used only for powering the meter’s internal
circuitry; they must not be used to supply power to external loads.
The recommended wire size is 16AWG to 20AWG (1.31mm 2 to 0.52mm 2 )
stranded copper wire. Wires must be properly stripped and attached to the
threaded standoffs such that their insulation is not pinched by the supplied
Caution, risk of danger
Equipment is protected throughout by double or reinforced insulation
5. Cleaning Instructions: Gently clean with dry cloth only.
6. Caution: if the equipment is used in a manner not speci?ed by Murata
Power Solutions, the protection provided by the equipment may be
impaired.
6-32 screws. Rated tightening torque for the 6-32 screws is 7 to 8 pound-
inches (0.8 to 0.9N-m). 300V UL rated wire suitable for the intended applica-
tion is required.
1.30
(33.0)
0.04
(1.016)
0.04
#6-32
UNC THD
0.44
(1.016)
1.38
(35.1)
(11.2)
0.80
(20.3)
0.88 0.44
(20.4) (10.2)
0.75
(19.1)
0.32
(8.1)
1.00
(25.4)
#2-56 INSERT
0.44
(10.2)
0.156 (3.96 DEEP
1.07
(27.2)
DMS-BZL3-C
Optional Bezel
0.44
(10.2)
Dimensions in inches (millimeters)
Tolerances: 2 PL Dec ±0.02 (±0.51)
3 PL Dec ±0.010 (±0.254)
Recommended panel cutout dimensions:
1.336 (33.93)W × 0.838 (21.29)H
0.10
(2.5)
1.63 (41.1)
0.10
(2.5)
Internal corner radii 0.032 (0.81) Max.
1.83 (46.5)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mans?eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Speci?cations are subject to change without
notice. ? 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
MPM_DMS-20PC-FM.G06 Page 2 of 2
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