ACA5-20RM scales and displays output of 5A CTs

Murata Power Solutions has released the Datel ACA5-20RM series of high current true-rms responding AC ammeters.

The series interfaces directly with an external 5A output current transformer (CT) and covers 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 sine-wave shape.

Other approaches to measurement such as average responding AC ammeters can cause reading errors in excess of 20 per cent of their full-scale output.

In critical applications, this may lead to inadvertent overloading of circuit breakers or fuses, which in turn can cause power outages.

The ACA5-20RM range scales and displays the output of 5A doughnut-style current transformers (CTs).

The series covers three ranges: 100A, 200A and 500A.

A choice of 85 to 140V AC or 170 to 264V AC (at 47 to 63Hz) operating supply voltages is offered for each range.

Maximum power consumption is less than 50mA.

Operating temperature range is 0C to +60C.

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 series 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.

Murata Power Solutions can supply 100:5, 200:5 and 500:5 accessory CTs.

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