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IAMMETER WEM3046T vs ABB B21 312-100

Install fit
Phase support Three-phase 4-wire WYE/Star; also used by IAMMETER for single-phase-as-3-meters and split-phase scenarios. Single-phase, 230 V AC.
Installation 2-pole DIN-rail meter with external xxx:5A CT wiring. Indoor 2-DIN-rail direct-connected meter for distribution boards; qualified-electrician installation.
Measurement Three-phase 5 A CT-input Wi-Fi energy meter with bidirectional active energy and electrical-parameter 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 1 active energy; +/-1.0% V/I/active power. MID Class B / IEC Class 1 active energy; reactive energy Class 2.
Current sensing Three external CT channels; no CTs are bundled. Each input accepts a third-party CT with a 5 A secondary output and a user-selected xxx:5A primary ratio. Direct connected up to 65 A; no external current transformer required.
Monitoring
Protocol Wi-Fi / HTTP / MQTT / Modbus TCP / RS485 Modbus RTU / Local API RS-485 Modbus RTU / EQ Bus / S0 pulse outputs
Local API Yes Yes
Cloud dependency Optional IAMMETER Cloud; local HTTP, MQTT, Modbus TCP/RTU and third-party server modes are supported. 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 IAMMETER online store availability; local warehouse and reseller stock vary by region. ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified Aug 31, 2026 Aug 11, 2026
Product page Official page Official page
Documentation Official docs Official docs
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