LED Display, Subminiature DC Ammeters with Built-In Shunts FEATURES n Built-in shunts for digitally measuring dc currents from 200uA to 20A n Functionally complete – no additional components required n Wide power supply inputs: 5 to 40Vdc for 5V/12/24V/28V applications 36-75V option for telecom supplies n 8-36Vdc Isolated-supply models for high-side shunts n 20mV internal shunt minimizes power loss n Includes load connections for easy 3 or 4-wire operation n High resolution; Factory calibrated to ±0.1% accuracy n Large, easy-to-read, LED display with 0.37” (9.4mm) high digits n Available with red, blue or green LED displays Murata Power Solutions’ new DCA-20PC Series are the first digital dc ammeters to include built-in shunts for measuring dc currents up to 20A. Six ranges provide for precision measurement of dc currents from 200uA to 20A. These ammeters are 100% self-contained; no calibration or user-supplied components are required—they even include terminal blocks for your external load circuit, a feature that enables simple 3-wire operation! Two shunt-configurations are offered: grounded-shunt (“low side”), 5-40V-powered models for cost-sensitive applications, and 8-36V isolated-supply models for high side or floating shunt applications. A versatile power supply design accommodates all popular supply voltages from 5 to 75Vdc. Reverse-polarity-protected supply inputs ensure trouble free installation. And, because many dc ammeters are installed in battery backup applications, power consumption is typically below 1 Watt for 8-36V models, and below 75mW for 5-40V models. To further reduce overall power consumption, the voltage dropped across its built-in series shunt is only 20mV! DCA-20PC Series ammeters are housed in subminiature, 1.38˝ x 0.88˝ (35mm x 22mm), rugged packages that feature a large, 0.37˝/9.4mm high, LED display. A built-in, high-contrast color filter ensures that legibility is not compromised: the display can be easily read at distances up to 15 feet (5 meters). Available LED-display colors include brilliant blue, bright green, and standard red. Built-in shunts, Precision electronics, miniature size, wide power supply inputs, low power consumption, and no-hassle 3-wire installation make DCA-20PC Series the ideal choice for all your 200uA to 20A ammeter-applications. – INPUT AMPLIFIER BUILT-IN SHUNT * Open on isolated-supply models ** Applies to isolated-supply models only – For full details go to www.murata-ps.com/rohs POWER GROUND SIGNAL GROUND EXTERNAL LOAD Figure 1. Simplified Schematic

Performance/Functional Specifications Murata Power Solutions _DCA-20PC S6fi6SLED Display, Subminiature DC Ammeters with Built-In Shunts Typical at Ta = +25°C, unless otherwise noted. Physical/Environmental (continued) Full-scale load current Ordering Information BL = Low-Power Blue BS = Super Blue GS = Standard Green PGL = Low-Power Green RL = Low-Power Red Power Supply: (available with -RL, -BL, or -PGL LEDs) DC4 = +8-36Vdc, isolated power (available with -RL, -BS, or -GS LEDs) See www.murata.com/products/power for model-specific availability. DMS-20-CP Panel Cutout Punch A DMS-BZL4-C bezel...

DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts TECHNICAL NOTES To ensure safe and reliable operation, DCA-20PC dc ammeters must be installed and serviced by qualified technical personnel. DC ammeter applications can expose a user to potentially lethal currents and voltages. Power and load connections must be made with all associated power sources de-energized. Contact Murata Power Solutions if you have any questions regarding installation or operation of any of our digital instruments. DCA-20PC ammeters’ power supply and shunt terminals are not internally fused. Therefore,...

DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts TECHNICAL NOTES Low-side shunts: Applications that employ a single power supply to powerboththeloadandtheammeter,andtheexternalshuntislocated in the negative side of the supply (commonly referred to as“low side”or “groundedshunt”)shoulduse‘-DC1’non-isolatedpowerDCA-20PCSeries ammeters. Figures 2 and 3 depict typical low-side shunt connections. High-side shunts: ‘-DC4’ 8-36Vdc isolated-power models must be used in all applications that employ a single power supply to power boththeloadandtheammeterandtheshuntislocatedinthehighside...

DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts TECHNICAL NOTES Ifdesired,analternativedecimalpointbycanbeenablebyopeningthe factory closed solder gap and then closing one of the other two solder gaps. The closing of SG1, SG2, or SG3 selects DP1 (“1.XXX”), DP2 (“1X.XX”), or DP3 (“1XX.X”), respectively. illuminationofthedisplay’snegative(-)sign;theabsenceofanegative sign implies positive current flow. Contact Murata Power Solutions if you have any questions regarding bipolar operation of DCA-20PC ammeters.detailedwiringinformation.AnyreconfigurationofJ3must bemadepriortoconnectingthepowersupplyandloadtotheammeter....

DCA-20PC Series LED Display, Subminiature DC Ammeters with Built-In Shunts MECHANICAL SPECIFICATIONS 0.4750.475 (12.1)(12.1) 1.04 (26.4) 1.04 MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) 1.42 (36.1) FRONT VIEW ALL MODELS BACK VIEW DCA-20PC-X-DC4 MODELS FRONT VIEW ALL MODELS BACK VIEW DCA-20PC-X-DC1 MODELS BACK VIEW 1 DCA-20PC-X-DC4 MODELS CAL FRONT VIEW 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING SUPPLIED BEZEL ASSEMBLY INTERNAL CORNER RADII: 0.032 (0.81) MAX. BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT +SHUNT #2-56 INSERT...