M552 Overview

The M552 is a self-powered, fully programmable three phase power transducer embedded into a three phase current transformer. It has two isolated RS485 based communication ports supporting a subset of Modicon’s Modbus protocol.


Its accuracy is class 0.25% for input signals down to 10% Un and 10% In, (1% of reading for energy measurements.IEC1036), 50-60Hz.

The M552 measures Voltages, Currents, Import/Export Power (W, VAr, VA), True Power Factor, Frequency, Import/Export Demands(Wd, VArd, VAd, Ad) and Import/Export Energy (W.h, VAr.h, VA.h, and A.h)

All measured quantities can be extracted from the transducer, the system’s parameters can be set up remotely, important data can be saved to computer and the order of the Modbus registers themselves can be changed.

See also
3X and duplicated 3X Registers
3X Register Order
4X Registers