Miniature Digital AC Ammeters

General Details

Miniature Digital AC Ammeters

Miniature Digital AC Ammeters in the 549 Digital AC Ammeter series are designed to accurately measure AC RMS Current via a standard 5 amp ac secondary Current transformer. Measurements will be displayed on an integral LCD for easy viewing.

The small compact design of Miniature Digital AC Ammeters allows fitting in a standard 17/32″ switch knock out. The product harvests power from the input signal therefore eliminating the need for a separate power supply. The small miniature size allows for significant panel saving space, and easy installation or replacement of any existing products. The unit has simple clamp fixing. These units are IP52 (front of panel) rated.

Units offer programmable current ratios with an easy front cover button interface, for extra versatility.

Applications include building management, control panels, distribution systems, energy management, generator sets, motor control, and switchgear. Units are cRU approved.

Advantages of  these digital meters are programmability of the current ratio, and accuracy of +/- 1 %. Units are sealed to IP52 (front panel) and IP30 (case).

The Crompton Instruments product range represents one of the largest product offerings of power measurement, control, and protection instrumentation, for switchgear and generator set manufacturers, panel builders and OEMs.

Crompton Instruments products offer proven reliability across a diverse array of industries including power generation, process control, test and measurement, utility, marine, defence and energy management applications. To meet the challenges of ever decreasing lead times and industry developments, design and manufacturing processes are constantly reviewed and updated.

By combining local knowledge with over 100 years of research, product development and manufacturing capabilities, Crompton Instruments products provide the highest standards of performance and user convenience.


  • Compact size
  • Easy installation or replacement
  • Fits stranded 17/32″ knock outs
  • No power supply needed
  • Panel space saving Miniature Design
  • Programmable CT ratios
  • Simple clamp fixing



  • FCC Part 15


  • cRU E171167
  • UL E171167


  • cRU E171167
  • UL E171167