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IAMMETER WEM3046T vs ABB B21 312-100

Energy Meter

IAMMETER WEM3046T

Energy Meter

ABB B21 312-100

ABB B21 312-100 / 2CMA100155R1000

Decision point	IAMMETER WEM3046T	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, 220-240 V AC, 50/60 Hz.
Installation	2-pole DIN-rail meter with external xxx:5A CT wiring.	Indoor 2-module 35 mm DIN-rail direct-connected installation; IP20 meter for qualified-electrician panel wiring.
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; Class 2 reactive energy.
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.	Built-in direct current path rated 0.25-5(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
Price range	Unknown	EUR 420 gross list price from ABB Netherlands; net price, tax, stock, and regional distributor pricing vary.
Availability	Global official-store and marketplace availability; local WEM3046T warehouse/platform lanes listed for China, United States, Australia and Germany. Stock and shipping vary.	ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified	Oct 5, 2026	Oct 14, 2026
Product page	Official page	Official page
Documentation	Official docs	Official docs