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OpenEnergyMonitor emonTx6 vs ABB A41 312-100

Energy Meter

OpenEnergyMonitor emonTx6

Energy Meter

ABB A41 312-100

ABB A41 312-100 / 2CMA170503R1000

Decision point	OpenEnergyMonitor emonTx6	ABB A41 312-100

Install fit
Phase support	Single-phase and three-phase four-wire AC; three-phase three-wire is unsupported.	Single-phase 2-wire; nominal 230 V AC, 57.7-288 V L-N operating range, 50/60 Hz +/-5%.
Installation	Wall-mounted node with external emonVs voltage/power sensor and clip-on CTs; competent panel installation required.	Indoor 4-module DIN-rail direct-connected installation by a qualified electrician.
Measurement	Six-channel continuous-sampling CT measurement of real/reactive power and cumulative energy.	Single-phase direct-connected four-quadrant active/reactive energy and electrical-parameter 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.	Built-in direct current path, 0.25 A minimum, 5 A base/reference current and 80 A maximum; no external CT.
Monitoring
Protocol	433.92 MHz radio / USB-C serial / optional emonWiFi Wi-Fi and MQTT	RS-485 Modbus RTU / EQ Bus
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 cloud required; display and RS-485 Modbus RTU / EQ Bus provide local access.
Home Assistant	Yes	Yes
Solar fit
Solar import/export	Yes	Yes
Buying context
Price range	GBP 198.67 inc. VAT / GBP 165.56 ex. VAT before option changes	EUR 919 gross list price via ABB Netherlands; net price, tax and regional pricing vary.
Availability	UK official shop; international shipping varies by destination, tax, radio rules and electrical suitability.	Global ABB channels; Netherlands official listing verified; stock and certification vary by market.
Source check
Last verified	Oct 13, 2026	Oct 16, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs