Device overview

ABB B23 212-100 is a compact three-phase energy meter for direct-connected circuits up to 65 A. It combines MID Class B active-energy accuracy, reactive-energy measurement, import/export registers, and RS-485 Modbus communication in a four-module DIN-rail format.

Core features

  • Measures active and reactive energy in both import and export directions.
  • Supports three-phase three-wire and four-wire systems through 2- or 3-element metering.
  • Provides local readings and configuration through the display, infrared interface, pulse/alarm output, and RS-485 Modbus RTU or EQ Bus.
  • Uses direct connection up to 65 A, so an external current transformer is not required.

Installation and measurement

This is an indoor distribution-board device for professional installation. Its direct-connected design is useful where the measured circuit remains within 65 A and a compact four-module meter is preferred. Higher-current circuits that require external CTs should use a suitable CT-operated meter instead.

Compatibility and local access

The meter does not require an ABB cloud service. A building-management system, gateway, or local controller can poll the documented registers over RS-485. Home Assistant can use its Modbus integration with a compatible serial adapter or gateway and manual register configuration; there is no native ABB Home Assistant integration.

Solar and import/export use

Separate import and export registers make the B23 212-100 suitable for monitoring bidirectional grid flow in solar and energy-management projects. This is a measurement capability only: the meter does not control an inverter or enforce an export limit by itself.

Best-fit scenarios

  • Three-phase residential or light-commercial sub-metering.
  • Solar import/export monitoring where a local Modbus meter is required.
  • Building-energy systems that need MID-grade active-energy data without a vendor cloud.
  • Installations that need reactive-energy measurement but do not need the extra tariffs and I/O of the B23 312-100.

Advantages and limitations

The main strengths are direct 65 A wiring, local Modbus access, bidirectional active/reactive measurement, and a compact enclosure. The main limits are professional panel installation, manual integration work, and the 65 A direct-connect ceiling. Buyers should verify local MID requirements, network wiring, stock, and regional pricing before ordering.

Purchase and official sources

Use ABB's exact order code 2CMA100166R1000 to avoid confusion with the active-energy-only B23 112-100 or the more feature-rich B23 312-100. ABB Connect Netherlands provides an official ordering route; price and stock require local confirmation.