ESM multifunctional measuring device acts as a measuring transducer, revenue meter and power quality analyzer. ESM differentiates energy consumption by season, day type and time of day, providing time-of-use (TOU) data.

ESM complies with power quality measurement classes A and S defined in IEC 61000-4-30. ESM differentiates energy consumptions by power quality norms, and generates power quality report based on a selected period. ESM supports a variety of communication protocols and report formats.

ESM comes in compact plastic enclosure for DIN rail mounting. ENMI display module attaches to the back of the device, using spring-loaded contacts to receive both power supply and data. Optionally, the display can be connected with a patch cord if placed in different location.

ESM can pair with external ENMV-1 input-output modules to provide switchgear control functionality.

Three modifications of ESM are available, varying in the source of measured signals: ESM-HV, connected to electromagnetic instrument transformers, ESM-ET, connected to LPCT and CVT, and ESM-SV, connected to the digital IEC-61850-9-2LE process bus.

for connection to the electromagnetic measuring transformers of current and voltage

Revenue metering 

  • in accordance with IEC 62052-11:2003, IEC 62053-22:2003 and IEC 62053-23:2003, active energy class 0,2S or 0,5S reactive energy class 0.5 or 1, time-of-use records (TOU, 255 types of seasons, 255 types of days, 8 tariff zones per day)

Power quality metering

  • in accordance with IEC 61000-4-30:2008 (classes A, S), EN 50160:2010, IEC 61000-4-7:2009 (class I), IEC


  • RMS and from 1 up to 50 harmonics values of voltages (phase, line-to-line and average), currents (phase and average), power (active, reactive and apparent: phase and total) 
  • Frequency, power factor (phase and average)

Phasor Measurement Unit

  • The synchrophasor measurements in accordance with IEEE C37.118.1