NodOn 3CT Zigbee Energy Meter

Three phases on one 3P+N supply, or three independent single-phase circuits

Three split-core current transformers, rated 70 A (SEM-4-3-20_70A) or 120 A (SEM-4-3-20_120A) depending on the variant | The clamps snap around the phase conductors, so no circuit has to be rewired through the meter

120 A per phase on the SEM-4-3-20_120A variant, or 70 A on the SEM-4-3-20_70A variant

Class 1.0 to IEC 61557-12, stated as a 1% tolerance, with a measurement range of 50 mA to 70 A/120 A per phase

Rated 220-240 V single-phase and 380-415 V three-phase, so a 120/240 V North American split-phase service is out of scope

3P+N wiring with one current clamp per phase (IA, IB, IC) and phase-to-neutral or phase-to-phase voltage taps

Bidirectional measurement reports consumption and production separately, which is what makes solar self-consumption and export readable | Zigbee2MQTT exposes total and per-phase consumed and produced energy

Voltage, current, active and reactive power, apparent power and power factor per phase, plus AC frequency | Zigbee2MQTT exposes power_factor, power_reactive and power_apparent for phases A, B and C

NodOn advertises real-time monitoring of voltage, current, power and energy but publishes no reporting interval for this model

The meter keeps no history of its own beyond its cumulative energy registers, and NodOn ships no app: retention is whatever the host gateway or Home Assistant keeps

Not a native NodOn feature. Any cost figure is calculated by the home automation platform from the readings.

Not a native NodOn feature. Time-of-use pricing is a function of the home automation platform.

Not a native NodOn feature. Exporting the readings is a function of the home automation platform.

Not a native NodOn feature. Usage alerts are built in the home automation platform from the readings.

The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi

Zigbee 3.0 certified, 2.4 GHz, maximum radio power +10 dBm, so it joins an existing Zigbee network and needs a compatible coordinator or gateway | NodOn lists Home Assistant, Jeedom, Zigbee2MQTT and Edalso as compatible gateways for this model

The datasheet and user guide document a Modbus RTU interface on RS-485 communication terminals, alongside the Zigbee radio

No switching output: the meter measures only and has no relay to cut a load

NodOn lists load shedding on overconsumption, PV surplus diversion and EV-charge control among the meter's uses, driven by its readings | The switching itself is done by the compatible gateway or home automation system, not by the meter, which has no relay

Through the compatible Zigbee gateway or Home Assistant, not on the device itself

Fits inside the electrical panel next to the upstream protection device, with the clamps around the phase conductors

One 18 mm DIN module, with the snap-in split-core clamps closing around the phase wires

Not compatible with Google Home.

Not compatible with Amazon Alexa.

Not compatible with Apple Home.

Not compatible with Samsung SmartThings.

Zigbee2MQTT supports this exact model, the SEM-4-3-20, and exposes per-phase voltage, current, active, reactive and apparent power, power factor, AC frequency and consumed and produced energy | NodOn also lists Home Assistant among the compatible gateways for this model | Works with Home Assistant through ZHA and through Zigbee2MQTT.

The radio is Zigbee 3.0 only, with no Matter certification or Matter path documented for this model

A documented Modbus RTU interface over RS-485 serves the readings straight from the device terminals, with no cloud account in the path

No native MQTT, though Zigbee2MQTT republishes the readings

Nothing runs on the module itself: it is paired and configured from the Zigbee gateway, and it has only a status LED and a reset/pairing button