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Acrel ADW300 vs ABB B21 312-100

Install fit
Phase support Three-phase three-wire and three-phase four-wire wiring modes. Single-phase, 230 V AC.
Installation Indoor DIN-rail / distribution-box three-phase meter with external CT input and auxiliary AC/DC 85-265 V supply. Indoor 2-DIN-rail direct-connected meter for distribution boards; qualified-electrician installation.
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 Unknown 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; reactive energy Class 2.
Current sensing External CT input; ADW300 manual lists 3 x 1(6) A CT-input context and optional 333 mV / Rogowski access variants. Direct connected up to 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
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 Jul 24, 2026 Aug 11, 2026
Product page Official page Official page
Documentation Official docs Official docs
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