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OpenEnergyMonitor emonTx6 vs ABB A43 312-100

Install fit
Phase support Single-phase and three-phase four-wire AC; three-phase three-wire is unsupported. Three-phase three-wire and four-wire systems (2- and 3-element metering)
Installation Wall-mounted node with external emonVs voltage/power sensor and clip-on CTs; competent panel installation required. Indoor 7-module DIN-rail direct-connected installation; professional three- or four-wire panel wiring required.
Measurement Six-channel continuous-sampling CT measurement of real/reactive power and cumulative energy. Three-phase direct-connected four-quadrant meter for active/reactive/apparent energy, import/export, electrical parameters, and multi-tariff sub-metering.
Max current 200 A 80 A
Meter fit
Accuracy class Unknown MID Class B / IEC Class 1 active energy; Class 2 reactive energy
Current sensing Six inputs for 333 mV voltage-output CTs; official 20 A, 50 A, 100 A, and 200 A options. Direct-connected 80 A measurement; no external CT required
Monitoring
Protocol 433.92 MHz radio / USB-C serial / optional emonWiFi Wi-Fi and MQTT RS-485 Modbus RTU / EQ Bus / infrared interface / configurable pulse-alarm I/O
Local API Yes Yes
Cloud dependency No vendor cloud required; local radio, USB serial, optional emonWiFi, EmonCMS, ESPHome, Home Assistant and MQTT paths. EmonCMS.org is optional. No vendor cloud is required; readings and configuration are available locally over RS-485 Modbus RTU / EQ Bus and the meter display.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability UK official shop; international shipping varies by destination, tax, radio rules and electrical suitability. Global ABB product range; official localized product and distributor routes cover Europe, the Americas, Middle East/Africa, and Asia-Pacific, with stock and certification varying by market.
Source check
Last verified Aug 30, 2026 Aug 12, 2026
Product page Official page Official page
Documentation Official docs Official docs
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