ACA5-20RM : True-rms AC ammeters interface directly with current transformers to give dependable measurements in switching power supply applications

ACA5-20RM : True-rms AC ammeters interface directly with current transformers to give dependable measurements in switching power supply applications EN | FR | DE | CN | JP The ACA5-20RM series from Murata Power Solutions is a new family of functionally complete, high current, true-rms responding AC ammeters designed to interface directly with an external 5A output current transformer (CT) Covering input ranges from 100A to 500A, the ACA5-20RM series is ideal for use in electronic equipment that uses switching power supplies such as inverters and generators, battery chargers, power distribution units and AC/DC power supplies. True-rms responding ammeters provide accurate and reliable performance in switching power supply applications where input currents are typically distorted and do not resemble the universally recognized sine-wave shape. Other approaches to measurement such as average responding AC ammeters can result in reading errors in excess of 20% of their full-scale output. In critical applications, this may lead to inadvertent overloading of circuit breakers or fuses, which in turn can cause costly power outages. The ACA5-20RM family scales and displays the output of 5A 'donut' style current transformers (CTs). The series covers three ranges: 100A, 200A and 500A. A choice of 85 to 140VAC or 170 to 264VAC (at 47 to 63Hz) operating supply voltages is offered for each range. Maximum power consumption is less than 50mA and operating temperature range is 0°C to +60°C. Crest factors (the ratio of peak current to rms current) for the ACA5-20RM series are as high as five and all models specify 2000V isolation between the AC power source and the external 5A CT. The functionally complete design uses a reliable single-board construction, has a built-in low-burden toroid sensor and a bright red LED display with 9.4mm (0.37in.) high characters. Where specific applications require, Murata Power Solutions can supply 100:5, 200:5 and 500:5 accessory CTs. Ref. MPS340A

Further editorial information from:
Amy Collins
Marketing Communications Manager
Murata Power Solutions
Tel: +1-508-964-5270

Contact details for publication:
Murata Power Solutions, Inc.,
129 Flanders Road
Westborough, MA 01581, USA
Tel: +1-508-339-3000

About Murata Power Solutions
Murata Power Solutions ( is headquartered in Westborough, Massachusetts, with over 1,300 employees worldwide. Murata Power Solutions designs, manufactures and distributes DC-DC Converter, AC-DC Power Supply, Magnetic and Digital Panel Meter product lines, and offers these products in custom, standard and modified-standard variations. Murata Power Solutions. products are typically used within electronic applications serving major global market sectors including telecommunications, computing and industrial controls.

Murata Power Solutions is a division of Murata Manufacturing Co., Ltd., a worldwide leader in the design, manufacture and sale of electronic components and power supply modules. Murata's devices are found in a wide range of applications including consumer and automotive electronics, and wireless devices. The company has employees and manufacturing facilities throughout the world.

Follow Murata Power Solutions on Twitter: @murataps

Published at: 11-02-2009