The Smart Device Compare comparison

NodOn 3CT Zigbee Energy Meter vs Shelly Pro EM-50

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between NodOn 3CT Zigbee Energy Meter and Shelly Pro EM-50

A summary of selected recorded differences between these energy monitors. Check the full specification table below for details and conditions.

Feature differences among your selected devices

2.4 GHz Wi-Fi (connectivity): NodOn 3CT Zigbee Energy Meter — No (The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi); Shelly Pro EM-50 — Yes.
Bluetooth (connectivity): NodOn 3CT Zigbee Energy Meter — No; Shelly Pro EM-50 — Yes (Bluetooth 4.2, also works as a Bluetooth gateway).
Ethernet (connectivity): NodOn 3CT Zigbee Energy Meter — No; Shelly Pro EM-50 — Yes.
Data Export (data monitoring): NodOn 3CT Zigbee Energy Meter — No (Not a native NodOn feature. Exporting the readings is a function of the home automation platform.); Shelly Pro EM-50 — Yes (CSV export of the consumption chart).

Specifications to check side by side

Other (connectivity): NodOn 3CT Zigbee Energy Meter — Modbus RTU (RS-485) (The datasheet and user guide document a Modbus RTU interface on RS-485 communication terminals, alongside the Zigbee radio); Shelly Pro EM-50 — Modbus.
Zigbee (connectivity): NodOn 3CT Zigbee Energy Meter — Zigbee Hub required (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); Shelly Pro EM-50 — No.
Power Supply (installation): NodOn 3CT Zigbee Energy Meter — Mains (220-240 V / 380-415 V); Shelly Pro EM-50 — Mains (100-260 V).
Included Ct Sensors (metering): NodOn 3CT Zigbee Energy Meter — 3 (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); Shelly Pro EM-50 — 2 (2 x 50 A current transformers).

Information still to confirm

3 of 39 comparison fields lack a resolved value for at least one selected device. Missing information is not evidence that a feature is absent.
Check the full table and manufacturer documentation before ruling out a device.

These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.

Compare capabilities, compatibility and setup requirements.

Option 1 · NodOn

NodOn 3CT Zigbee Energy Meter

Catalog update date not recorded

View full device profile

Option 2 · Shelly

Shelly Pro EM-50

Last updated October 2026

View full device profile

What the catalog tells us

Understand the tradeoffs.

These counts describe the available data, not a quality score. More features do not automatically make a better device.

20differences with recorded values for every device

3rows with missing or unspecified information

Your priorities, side by side

Focus on what changes.

Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.

Differences onlyMy priorities (0)

Showing 39 of 39 rows. “Not recorded” does not mean “No”.

Reading layout

Connectivity

2.4 GHz Wi-Fi

NodOn 3CT Zigbee Energy Meter: No
Catalog note
The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi
Shelly Pro EM-50: Yes

5 GHz Wi-Fi

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: No

Bluetooth

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: Yes
Catalog note
Bluetooth 4.2, also works as a Bluetooth gateway

Ethernet

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: Yes

Other

NodOn 3CT Zigbee Energy Meter: Modbus RTU (RS-485)
Catalog note
The datasheet and user guide document a Modbus RTU interface on RS-485 communication terminals, alongside the Zigbee radio
Shelly Pro EM-50: Modbus

Thread

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: No

Z Wave

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: No

Zigbee

NodOn 3CT Zigbee Energy Meter: Zigbee Hub required
Catalog note
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
Shelly Pro EM-50: No

Data Monitoring

Data Export

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not a native NodOn feature. Exporting the readings is a function of the home automation platform.
Shelly Pro EM-50: Yes
Catalog note
CSV export of the consumption chart

Data History

NodOn 3CT Zigbee Energy Meter: Not applicable / unspecified
Catalog note
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
Shelly Pro EM-50: 60 days
Catalog note
At least 60 days of 1-minute data stored on the device

Energy Cost Tracking

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not a native NodOn feature. Any cost figure is calculated by the home automation platform from the readings.
Shelly Pro EM-50: Yes

Real Time Updates

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
NodOn advertises real-time monitoring of voltage, current, power and energy but publishes no reporting interval for this model
Shelly Pro EM-50: Not recorded

Time Of Use Rates

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not a native NodOn feature. Time-of-use pricing is a function of the home automation platform.
Shelly Pro EM-50: Yes
Catalog note
Cost periods and tariff distribution in the Shelly Smart Control app

Usage Alerts

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not a native NodOn feature. Usage alerts are built in the home automation platform from the readings.
Shelly Pro EM-50: Yes

Features

Automations

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
Through the compatible Zigbee gateway or Home Assistant, not on the device itself
Shelly Pro EM-50: Yes

Load Management

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
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
Shelly Pro EM-50: Yes
Catalog note
Configurable load control to divert surplus PV production

Relay Output

NodOn 3CT Zigbee Energy Meter: No
Catalog note
No switching output: the meter measures only and has no relay to cut a load
Shelly Pro EM-50: Yes
Catalog note
Integrated switch with potential-free contacts, 2 A at 240 V

Installation

Breaker Panel Install

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
Fits inside the electrical panel next to the upstream protection device, with the clamps around the phase conductors
Shelly Pro EM-50: Yes

Din Rail Mount

NodOn 3CT Zigbee Energy Meter

Yes

Manufacturer source

The unit occupies one 18 mm DIN rail slot.

NodOn 3CT Zigbee Energy Meter manufacturer product page →

Source section: SEM-4-3-20 technical data
Model: NodOn 3CT Zigbee Energy Meter
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Separate 70 A and 120 A variants are listed; select the matching current transformers.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

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

Shelly Pro EM-50

Yes

Catalog note

One DIN module wide

Power Supply

NodOn 3CT Zigbee Energy Meter: Mains (220-240 V / 380-415 V)
Shelly Pro EM-50: Mains (100-260 V)

Smart Meter Port

NodOn 3CT Zigbee Energy Meter: No
Shelly Pro EM-50: No

Integrations

Alexa

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not compatible with Amazon Alexa.
Shelly Pro EM-50: Yes

Apple Home

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not compatible with Apple Home.
Shelly Pro EM-50: No

Google Home

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not compatible with Google Home.
Shelly Pro EM-50: Yes

Home Assistant

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
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.
Shelly Pro EM-50: Yes

Matter

NodOn 3CT Zigbee Energy Meter: No
Catalog note
The radio is Zigbee 3.0 only, with no Matter certification or Matter path documented for this model
Shelly Pro EM-50: No

SmartThings

NodOn 3CT Zigbee Energy Meter: No
Catalog note
Not compatible with Samsung SmartThings.
Shelly Pro EM-50: Yes
Catalog note
Via the official Shelly Cloud integration

Local Control

Local Api

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
A documented Modbus RTU interface over RS-485 serves the readings straight from the device terminals, with no cloud account in the path
Shelly Pro EM-50: Yes
Catalog note
RPC over HTTPS and WebSocket, UDP, webhooks, scripting and Modbus TCP

Local Web Interface

NodOn 3CT Zigbee Energy Meter: No
Catalog note
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
Shelly Pro EM-50: Yes

Mqtt

NodOn 3CT Zigbee Energy Meter: No
Catalog note
No native MQTT, though Zigbee2MQTT republishes the readings
Shelly Pro EM-50: Yes

Metering

Accuracy

NodOn 3CT Zigbee Energy Meter

±1%

Manufacturer source

The stated energy-measurement tolerance is one percent.

NodOn 3CT Zigbee Energy Meter manufacturer product page →

Source section: SEM-4-3-20 technical data
Model: NodOn 3CT Zigbee Energy Meter
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Separate 70 A and 120 A variants are listed; select the matching current transformers.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

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

Shelly Pro EM-50

±1%

Catalog note

Accuracy Class B for active energy, ±1% from 5 A to 50 A

Bidirectional Metering

NodOn 3CT Zigbee Energy Meter

Yes

Manufacturer source

It measures both consumption and generation.

NodOn 3CT Zigbee Energy Meter manufacturer product page →

Source section: SEM-4-3-20 technical data
Model: NodOn 3CT Zigbee Energy Meter
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Separate 70 A and 120 A variants are listed; select the matching current transformers.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

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

Shelly Pro EM-50

Yes

Catalog note

4 quadrant measurement with a returned energy counter

Branch Ct Rating

NodOn 3CT Zigbee Energy Meter: Not applicable / unspecified
Shelly Pro EM-50: Not applicable / unspecified

Included Ct Sensors

NodOn 3CT Zigbee Energy Meter: 3
Catalog note
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
Shelly Pro EM-50: 2
Catalog note
2 x 50 A current transformers

Main Ct Rating

NodOn 3CT Zigbee Energy Meter: 70 / 120 A
Catalog note
120 A per phase on the SEM-4-3-20_120A variant, or 70 A on the SEM-4-3-20_70A variant
Shelly Pro EM-50: 50 A

Monitored Circuits

NodOn 3CT Zigbee Energy Meter

Manufacturer source

The meter provides three measurement channels.

NodOn 3CT Zigbee Energy Meter manufacturer product page →

Source section: SEM-4-3-20 technical data
Model: NodOn 3CT Zigbee Energy Meter
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Separate 70 A and 120 A variants are listed; select the matching current transformers.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

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

Shelly Pro EM-50

Power Factor

NodOn 3CT Zigbee Energy Meter: Yes
Catalog note
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
Shelly Pro EM-50: Yes
Catalog note
Active and apparent power, power factor, frequency and voltage

Split Phase

NodOn 3CT Zigbee Energy Meter: No
Catalog note
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
Shelly Pro EM-50: No
Catalog note
Single-phase device with two current channels

Three Phase

NodOn 3CT Zigbee Energy Meter

Yes

Manufacturer source

The meter supports three-phase installations.

NodOn 3CT Zigbee Energy Meter manufacturer product page →

Source section: SEM-4-3-20 technical data
Model: NodOn 3CT Zigbee Energy Meter
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

Separate 70 A and 120 A variants are listed; select the matching current transformers.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

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

Shelly Pro EM-50

Specifications for NodOn 3CT Zigbee Energy Meter versus Shelly Pro EM-50
Specification	NodOn 3CT Zigbee Energy Meter	Shelly Pro EM-50
Connectivity
2.4 GHz Wi-Fi	No Catalog note The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi	Yes
5 GHz Wi-Fi	No	No
Bluetooth	No	Yes Catalog note Bluetooth 4.2, also works as a Bluetooth gateway
Ethernet	No	Yes
Other	Modbus RTU (RS-485) Catalog note The datasheet and user guide document a Modbus RTU interface on RS-485 communication terminals, alongside the Zigbee radio	Modbus
Thread	No	No
Z Wave	No	No
Zigbee	Zigbee Hub required Catalog note 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	No
Data Monitoring
Data Export	No Catalog note Not a native NodOn feature. Exporting the readings is a function of the home automation platform.	Yes Catalog note CSV export of the consumption chart
Data History	Not applicable / unspecified Catalog note 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	60 days Catalog note At least 60 days of 1-minute data stored on the device
Energy Cost Tracking	No Catalog note Not a native NodOn feature. Any cost figure is calculated by the home automation platform from the readings.	Yes
Real Time Updates	Yes Catalog note NodOn advertises real-time monitoring of voltage, current, power and energy but publishes no reporting interval for this model	Not recorded
Time Of Use Rates	No Catalog note Not a native NodOn feature. Time-of-use pricing is a function of the home automation platform.	Yes Catalog note Cost periods and tariff distribution in the Shelly Smart Control app
Usage Alerts	No Catalog note Not a native NodOn feature. Usage alerts are built in the home automation platform from the readings.	Yes
Features
Automations	Yes Catalog note Through the compatible Zigbee gateway or Home Assistant, not on the device itself	Yes
Load Management	Yes Catalog note 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	Yes Catalog note Configurable load control to divert surplus PV production
Relay Output	No Catalog note No switching output: the meter measures only and has no relay to cut a load	Yes Catalog note Integrated switch with potential-free contacts, 2 A at 240 V
Installation
Breaker Panel Install	Yes Catalog note Fits inside the electrical panel next to the upstream protection device, with the clamps around the phase conductors	Yes
Din Rail Mount	Yes Manufacturer source The unit occupies one 18 mm DIN rail slot. NodOn 3CT Zigbee Energy Meter manufacturer product page → Source section SEM-4-3-20 technical data Model NodOn 3CT Zigbee Energy Meter Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Separate 70 A and 120 A variants are listed; select the matching current transformers. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note One 18 mm DIN module, with the snap-in split-core clamps closing around the phase wires	Yes Catalog note One DIN module wide
Power Supply	Mains (220-240 V / 380-415 V)	Mains (100-260 V)
Smart Meter Port	No	No
Integrations
Alexa	No Catalog note Not compatible with Amazon Alexa.	Yes
Apple Home	No Catalog note Not compatible with Apple Home.	No
Google Home	No Catalog note Not compatible with Google Home.	Yes
Home Assistant	Yes Catalog note 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.	Yes
Matter	No Catalog note The radio is Zigbee 3.0 only, with no Matter certification or Matter path documented for this model	No
SmartThings	No Catalog note Not compatible with Samsung SmartThings.	Yes Catalog note Via the official Shelly Cloud integration
Local Control
Local Api	Yes Catalog note A documented Modbus RTU interface over RS-485 serves the readings straight from the device terminals, with no cloud account in the path	Yes Catalog note RPC over HTTPS and WebSocket, UDP, webhooks, scripting and Modbus TCP
Local Web Interface	No Catalog note 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	Yes
Mqtt	No Catalog note No native MQTT, though Zigbee2MQTT republishes the readings	Yes
Metering
Accuracy	±1% Manufacturer source The stated energy-measurement tolerance is one percent. NodOn 3CT Zigbee Energy Meter manufacturer product page → Source section SEM-4-3-20 technical data Model NodOn 3CT Zigbee Energy Meter Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Separate 70 A and 120 A variants are listed; select the matching current transformers. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note 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	±1% Catalog note Accuracy Class B for active energy, ±1% from 5 A to 50 A
Bidirectional Metering	Yes Manufacturer source It measures both consumption and generation. NodOn 3CT Zigbee Energy Meter manufacturer product page → Source section SEM-4-3-20 technical data Model NodOn 3CT Zigbee Energy Meter Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Separate 70 A and 120 A variants are listed; select the matching current transformers. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note 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	Yes Catalog note 4 quadrant measurement with a returned energy counter
Branch Ct Rating	Not applicable / unspecified	Not applicable / unspecified
Included Ct Sensors	3 Catalog note 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	2 Catalog note 2 x 50 A current transformers
Main Ct Rating	70 / 120 A Catalog note 120 A per phase on the SEM-4-3-20_120A variant, or 70 A on the SEM-4-3-20_70A variant	50 A
Monitored Circuits	3 Manufacturer source The meter provides three measurement channels. NodOn 3CT Zigbee Energy Meter manufacturer product page → Source section SEM-4-3-20 technical data Model NodOn 3CT Zigbee Energy Meter Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Separate 70 A and 120 A variants are listed; select the matching current transformers. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Three phases on one 3P+N supply, or three independent single-phase circuits	2
Power Factor	Yes Catalog note 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	Yes Catalog note Active and apparent power, power factor, frequency and voltage
Split Phase	No Catalog note 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	No Catalog note Single-phase device with two current channels
Three Phase	Yes Manufacturer source The meter supports three-phase installations. NodOn 3CT Zigbee Energy Meter manufacturer product page → Source section SEM-4-3-20 technical data Model NodOn 3CT Zigbee Energy Meter Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Separate 70 A and 120 A variants are listed; select the matching current transformers. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note 3P+N wiring with one current clamp per phase (IA, IB, IC) and phase-to-neutral or phase-to-phase voltage taps	No

Know what’s behind the comparison.

The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.

Read our comparison methodology