Device overview
The ABB B23 312-100 is a compact three-phase DIN-rail energy meter for direct-connected circuits up to 65 A. It combines certified active-energy metering with reactive-energy measurement, separate import and export registers, electrical-parameter monitoring, multi-tariff accounting, configurable inputs and outputs, and local RS-485 communications.
The exact product covered here is order code 2CMA100169R1000. Selecting the exact code matters because B23 variants differ in accuracy tier, communications, I/O and tariff functions.
Core specifications
- Three-phase direct connection, rated 0.01-6(65) A
- Supports three-wire and four-wire systems through two- or three-element metering
- MID Class B / IEC Class 1 active-energy accuracy
- Class 2 reactive-energy accuracy
- Separate imported and exported active-energy registers
- Up to four tariffs
- Two configurable inputs and two configurable outputs
- RS-485 Modbus RTU and EQ Bus communications
- Four-module DIN-rail format
Installation and current measurement
This model measures current directly through the meter terminals and does not require external current transformers. Its 65 A maximum therefore represents the circuit current limit of this exact direct-connected SKU, not a CT ratio or a wider product-family claim.
Installation belongs inside an electrical distribution board and requires correct three-phase voltage/current wiring, upstream protection and commissioning by a qualified electrician. The choice between three-wire and four-wire configuration must match the site's supply topology.
Metering and solar relevance
The B23 312-100 records imported and exported energy in separate registers. That makes it useful for sites that need to distinguish grid consumption from exported solar generation, as well as for commercial sub-metering and tenant allocation.
The import/export capability is measurement only. The meter does not control an inverter, enforce an export limit or provide solar optimization by itself.
Local access and Home Assistant
Measurements and configuration are available locally from the front display and over RS-485 Modbus RTU or EQ Bus. Normal metering does not depend on ABB cloud services.
Home Assistant can read the meter through its Modbus integration when the installation includes a suitable RS-485 adapter or gateway and the ABB register map is configured manually. This is protocol-level compatibility, not a native ABB Home Assistant integration or automatic discovery workflow.
Comparison guidance
For buyer comparisons, the most important distinction is direct 65 A measurement versus CT-operated meters. Direct connection simplifies smaller circuits but cannot scale past the meter's rated current; CT meters are preferable for larger feeders. The MID Class B rating can also matter where certified billing or allocation evidence is required, while Class 2 reactive-energy accuracy is relevant to facilities tracking power-factor-related performance.
The Modbus interface is valuable when local data ownership, building-management integration or non-cloud monitoring is a requirement. Buyers who only need a simple pulse output may not need the additional communications and I/O features of this Silver-tier variant.
Purchase and source notes
ABB lists the product globally, but certifications, channel availability, tax and lead times vary by market. The linked ABB Netherlands channel showed a gross list price of EUR 622, a current but non-stocked ordering state, and an indicative four-calendar-day lead time when checked on 12 August 2026. Confirm local pricing, stock and approval requirements before purchase.