Three-phase smart electricity meter with built-in NB-Fi modem
Measures consumed and generated power
Keeps record of active and reactive power within a multi-tariff
Can be used to switch off the meters’ load relays and set the tariff schedule remotely
Accuracy class
Active energy: 1
(IEC 62053-21),
Reactive energy: 2
(IEC 62053-23)
3×230/400 V
Base current
5 A
Maximum current
80 A, 100 A
Primary data exchange protocol
Radio frequency
860-925 MHz
Maximum RF TX Power
25 mW
Remote readings
custom intervals from 1 to 60 minutes
Distance range
up to 5 km (urban), up to 10 km (rural)
Data encryption
Additional communication interfaces
RS-485 (optional)
Supported exchange protocols
Remote load relay control
Power quality measurements
Neutral conductors monitoring
Net weight
1.5 kg
235×171×65 mm
Operating temperature
-40°С ~ +70°С
Average lifetime, years

Static three-phase electricity meter WAVIoT EM 3 is designed for active and reactive electricity and power quality measurements in AC three-phase four-wire electric grids. Three-phase WAVIoT EM 3 electricity meters can be installed in apartments, houses, enterprises and power grids.

WAVIoT EM 3 with built-in NB-Fi modem transmits data to NB-Fi base stations that may be located in a long distance. NB-Fi base stations provide bi-directional connectivity between WAVIoT electricity meters and WAVIoT Meter Data Management system. NB-Fi ensures wireless collection of real-time consumption data and a detailed usage overview, which is then automatically processed. The readings of the meter are transmitted via NB-Fi protocol at custom intervals from 1 to 60 minutes.

The WAVIoT electricity meters measure the following parameters:

  • Active energy in each tariff and the total active energy, kW·h
  • Reactive energy in each tariff and the total reactive energy, kvar·h
  • Electric grid parameters (phase voltage, line voltage, current in each phase, active, reactive and total power (for each phase and overall), instantaneous power factor in each phase and overall, AC frequency)
  • Power quality parameters of electric energy (positive and negative voltage deviation, frequency deviation, voltage dip duration and depth, overvoltage duration)

WAVIoT EM electricity meter has a non-volatile memory for power consumption data, logs up to 1,000 event records, and notifies customers about events such as exceeding of limits of power, voltage or current, loss of power supply or case tampering.

WAVIoT Head End system enables automatic synchronization of time for each electricity meter in the NB-Fi network, and remote wireless firmware upgrade through the bi-directional NB-Fi connectivity.

Distribution or utility service companies, as well as owners of WAVIoT electricity meters can switch off the load relay remotely via WAVIoT MDM system. Suppliers can also change the tariff schedule for all WAVIoT electricity meters simultaneously.

Detailed power consumption data and event logs for every WAVIoT electricity meter are available in WAVIoT MDM system. Individual or summary consumption reports and event logs can be downloaded in Excel. APIs of WAVIoT HES and MDM system are available for integration with external IT systems. WAVIoT electricity meters support the DLMS/COSEM Communication protocol that ensures interoperability and enables standard communication with electricity meter.

NB-Fi ensures confidentiality and integrity of the transmitted information ‒ data is protected with end-to-end AES-256 encryption.

WAVIoT three-phase and single-phase electricity meters are a reliable solution for building Smart AMI and Smart Grid systems. WAVIoT electricity meters are deployed quickly with minimal additional infrastructure cost, and allow building a scalable AMI/Smart Grid system for efficient energy monitoring, management and billing.

Free Subscription

Use NB-Fi transceivers and get free access to the NB-Fi server at WAVIoT IoT Platform

We offer to use WAVIoT cloud based IoT Platform for your IoT solutions. It’s a simple and reliable option for your applications. Use NB-Fi transceivers for wireless long-range communication in your IoT devices and get the benefits from using of WAVIoT IoT Platform.
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WAVIoT IoT Platform

WAVIoT IoT Platform for the Internet of Things and the Industrial Internet of Things (IIoT) is a comprehensive solution to process all information from various IoT devices with NB-Fi transceiver that transmit data via the NB-Fi network.

WAVIoT IoT Platform can be used in Advanced Metering Infrastructure (AMI) and Smart Grid systems for power transmission and distribution, utility supply and management, energy services, agriculture, manufacturing, transport and logistics. WAVIoT IoT Platform collects, analyzes and stores data from millions of devices. The energy and utility sector will greatly benefit from the implementation of WAVIoT IoT Platform, as it reduces costs, increases convenience and improves security for the suppliers, customers and consumers.
WAVIoT IoT Platform is a cloud-based software that consists of the NB-Fi server (Head End System or HES) and the Meter Data Management System (MDM system or MDMS). WAVIoT IoT Platform collects and processes primary information from utility meters, sensors, gauges and other IoT devices, and provides tools for data analysis and visualization. Flexible API capabilities ensures integration with other IT systems, expanding the range of possible use cases.

WAVIoT IoT Platform can be installed in a corporate network and integrated with corporate AMI or enterprise system.

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Industry solutions

Build LPWAN IoT solutions for a wide range of industries requiring energy-efficient and long-distance data transmission with autonomous work, easy installation of devices, and fast ROI.

Industrial Automation

NB-Fi technology allows to design end-to-end IIoT applications helping businesses to implement efficient solutions that enable data exchange with devices and machines and ensure integration of automation in enterprise-level IT systems. With NB-Fi modems based on the NB-Fi transceiver, you will connect your devices to the NB-Fi Server and rapidly develop any kind of industrial application.
Learn more about IoT for enterprises

Smart Cities

IoT solutions for Smart Cities based on NB-Fi technology allow municipalities and utilities to make faster and better decisions that will lead to greater efficiency, safety and quality of life for people. More comprehensive and real-time data from devices, sensors and gauges gives the ability to monitor events, collect, analyze and use data to improve processes and optimize the consumption of valuable resources.
Learn more about IoT for Smart Cities

Smart Grids and Utilities

Positive examples of the implementation of Smart Grid and Advanced Metering Infrastructure projects in different countries show that it is possible to reduce the level of electricity losses in the grid by 20% of the total energy supply. Funds saved thanks to the reduction of losses can be used to implement Smart Grid infrastructure projects – installation of smart electricity meters, retrofitting of existing metering devices, launching of new services.
Improve utility efficiency with Advanced Meter Infrastructure based on NB-Fi

Smart Farming

The IoT-based smart farming system for collection and analysis of data from sensors (soil moisture, humidity, temperature) and for automation of the irrigation system helps farmers monitor the field conditions, improve the quality of decision-making and reduce the losses.
Why NB-Fi for Agriculture and Smart Farming?

Monitoring and Security

The IIoT solutions for remote monitoring of transportation and storage conditions, asset tracking and preventing product theft for supply chains, alarm systems and employee safety improve the business processes and prevent hazards.
Learn more about Smart Monitoring and Controlling using NB-Fi based IoT System