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Acrel ADW300 vs ABB B21 312-100

Energy Meter

Acrel ADW300

Energy Meter

ABB B21 312-100

ABB B21 312-100 / 2CMA100155R1000

Decision point	Acrel ADW300	ABB B21 312-100

Install fit
Phase support	Three-phase three-wire and three-phase four-wire wiring modes.	Single-phase, 220-240 V AC, 50/60 Hz.
Installation	Indoor DIN-rail / distribution-box three-phase meter with external CT input and auxiliary AC/DC 85-265 V supply.	Indoor 2-module 35 mm DIN-rail direct-connected installation; IP20 meter for qualified-electrician panel wiring.
Measurement	Three-phase CT-input wireless smart energy meter for active/reactive energy, electrical parameters, demand, harmonics, and power monitoring.	Direct-connected single-phase active/reactive energy and electrical-parameter metering with separate import/export registers.
Max current	2000 A	65 A
Meter fit
Accuracy class	Class 0.5S active energy for ADW300; Class 1 for ADW300W variant.	MID Class B / IEC Class 1 active energy; Class 2 reactive energy.
Current sensing	External CT input; ADW300 manual lists 3 x 1(6) A CT-input context and optional 333 mV / Rogowski access variants.	Built-in direct current path rated 0.25-5(65) A; no external current transformer required.
Monitoring
Protocol	RS485 Modbus RTU; optional Wi-Fi, 4G, NB-IoT, LoRa / LoRaWAN variants	RS-485 Modbus RTU / EQ Bus / S0 pulse outputs
Local API	Yes	Yes
Cloud dependency	No cloud required for RS485 Modbus RTU metering; Acrel IoT/cloud use is optional on wireless variants.	No vendor cloud required; measurements are read locally over RS-485 Modbus RTU, EQ Bus, S0 pulse, or the front display.
Home Assistant	Yes	Yes
Solar fit
Solar import/export	Yes	Yes
Buying context
Price range	Unknown	EUR 420 gross list price from ABB Netherlands; net price, tax, stock, and regional distributor pricing vary.
Availability	Global Acrel product range; local wireless-option availability and certification context vary.	ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified	Sep 22, 2026	Oct 14, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs