3-phase Rogowski meter class 0.5S Modbus A9MEM3555

Three-phase energy meter with current measurement using a Rogowski coil

This energy meter, from the Acti9 iEM3000 series, is an advanced device designed for precise energy consumption measurement in three-phase installations. It utilizes innovative current measurement technology using a Rogowski coil, eliminating the need for traditional current transformers. DIN rail mounted, with an LCD display, it provides clear and intuitive data reading. Additional LED indicators inform about correct operation, overloads and communication status.

This meter is an ideal solution for both installers and end-users looking for a reliable and accurate way to monitor energy consumption. The ability to configure four tariffs allows for energy cost optimization, and the Modbus RS-485 interface enables integration with building automation systems and remote data reading. The device measures active and reactive power, active and reactive energy, voltage and current – providing a complete picture of the load profile.

Features and application

• Indirect/semi-indirect measurement: The use of a Rogowski coil allows for flexible mounting and no influence on the electrical circuit. The Rogowski coil is placed on the power cable, measuring the current without direct electrical contact.
• Accuracy class B (0.5S): Ensures high precision of active energy measurements in accordance with IEC 62053-21 and ANSI C12.20 standards. This is crucial for sub-billing and energy invoicing.
• Modbus RS-485 communication interface: Enables easy integration with SCADA, BMS and other devices equipped with a Modbus interface. Allows for remote data reading and real-time network parameter monitoring.
• Multi-tariff: Support for up to four tariffs allows for energy cost optimization by billing consumption depending on the time of day or day of the week. Tariff control can be implemented both externally and internally.
• Pulse output (D0): Enables recording of energy consumption by external devices, e.g. alarm systems or data loggers. The number of pulses is programmable in the range of 1-1000 Imp/kWh (kvarh).
• Wide range of rated voltages: Support for voltages of 100-277 V (N-L) and 173-480 V (L-L) makes the meter compatible with various electrical installations.
• Compact dimensions: Width of 90 mm (5 modules) makes it easy to mount in electrical panels with limited space.
• Protection class IP20: Provides protection against touching fingers and small solid objects – suitable for indoor installation.

The frequency range of the meter is 50 - 60 Hz, and the number of phases is three-phase. Communication is via RS-485 interface, and the accuracy class is B (0.5S). The rated voltage L-L is 173 - 480 V, while N-L is 100 - 277 V.

This meter is a solid solution for demanding measurement applications, providing precision, reliability and configuration flexibility. It is an investment in efficient electrical energy management for both professionals and end-users.

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