The Smart Device Compare comparison

NodOn Zigbee Smart Energy Monitor vs Shelly EM Gen4

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between NodOn Zigbee Smart Energy Monitor and Shelly EM Gen4

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 Zigbee Smart Energy Monitor — No (The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi); Shelly EM Gen4 — Yes (Wi-Fi 6 (802.11 b/g/n/ax) on 2.4 GHz).
Bluetooth (connectivity): NodOn Zigbee Smart Energy Monitor — No; Shelly EM Gen4 — Yes (Bluetooth 5 LE).
Data Export (data monitoring): NodOn Zigbee Smart Energy Monitor — No (Not a native NodOn feature. Exporting the readings is a function of the home automation platform.); Shelly EM Gen4 — Yes (CSV for power quality values and JSON through RPC).
Energy Cost Tracking (data monitoring): NodOn Zigbee Smart Energy Monitor — No (Not a native NodOn feature. Any cost figure is calculated by the home automation platform from the readings.); Shelly EM Gen4 — Yes.

Specifications to check side by side

Accuracy (metering): NodOn Zigbee Smart Energy Monitor — ±1% (Class 1.0 to IEC 61557-12, stated as a 1% tolerance, over a measurement range of 50 mA to 63 A and a base current of 10 A); Shelly EM Gen4 — ±2%.
Monitored Circuits (metering): NodOn Zigbee Smart Energy Monitor — 1 (One 1P+N circuit: the line is wired through the meter's own terminals and the neutral passes alongside, so it meters a single circuit up to 63 A); Shelly EM Gen4 — 2.

Information still to confirm

5 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 Zigbee Smart Energy Monitor

Last updated October 2026

View full device profile

Option 2 · Shelly

Shelly EM Gen4

Catalog update date not recorded

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.

17differences with recorded values for every device

5rows with missing or unspecified information

Consider your setup

Apple Home

NodOn Zigbee Smart Energy MonitorNo
Shelly EM Gen4Yes

Confirm which features appear in Apple Home and whether extra hardware or a subscription is needed for your intended use.

Inspect the specifications

Consider your setup

Matter

NodOn Zigbee Smart Energy MonitorNo
Shelly EM Gen4Yes

Confirm the exact device type and the features exposed in your chosen platform. Protocol support does not establish feature parity across apps.

Inspect the specifications

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 Zigbee Smart Energy Monitor: No
Catalog note
The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi
Shelly EM Gen4: Yes
Catalog note
Wi-Fi 6 (802.11 b/g/n/ax) on 2.4 GHz

5 GHz Wi-Fi

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Bluetooth

NodOn Zigbee Smart Energy Monitor

Shelly EM Gen4

Yes

Manufacturer source

Bluetooth connectivity is documented.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Catalog note

Bluetooth 5 LE

Ethernet

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Other

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Thread

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Z Wave

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Zigbee

NodOn Zigbee Smart Energy Monitor: 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, SmartThings, Jeedom and Zigbee2MQTT as compatible gateways for this model
Shelly EM Gen4: Zigbee Hub required
Catalog note
Zigbee 802.15.4 and acts as a Zigbee repeater

Data Monitoring

Data Export

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not a native NodOn feature. Exporting the readings is a function of the home automation platform.
Shelly EM Gen4: Yes
Catalog note
CSV for power quality values and JSON through RPC

Data History

NodOn Zigbee Smart Energy Monitor

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 EM Gen4

30 days

Manufacturer source

Local storage retains at least 30 days of one-minute records.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Catalog note

At least 30 days of 1-minute records stored on the device

Energy Cost Tracking

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not a native NodOn feature. Any cost figure is calculated by the home automation platform from the readings.
Shelly EM Gen4: Yes

Real Time Updates

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
NodOn advertises real-time monitoring of voltage, current, power and energy but publishes no reporting interval for this model
Shelly EM Gen4: Not recorded

Time Of Use Rates

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not a native NodOn feature. Time-of-use pricing is a function of the home automation platform.
Shelly EM Gen4: Yes
Catalog note
Cost periods and tariff distribution in the Shelly Smart Control app

Usage Alerts

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not a native NodOn feature. Usage alerts are built in the home automation platform from the readings.
Shelly EM Gen4: Yes

Features

Automations

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
Through the compatible Zigbee gateway or Home Assistant, not on the device itself
Shelly EM Gen4: Yes

Load Management

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
NodOn lists load shedding on overconsumption 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 EM Gen4: Yes
Catalog note
Switch a contactor from consumption thresholds or schedules

Relay Output

NodOn Zigbee Smart Energy Monitor

Catalog note

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

Shelly EM Gen4

Yes

Manufacturer source

A dry-contact relay can control an external contactor.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Catalog note

Dry contact rated 2 A at 240 V for contactor control

Installation

Breaker Panel Install

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
Installed in-line inside the electrical panel on an existing circuit, next to the upstream protection device
Shelly EM Gen4: Yes
Catalog note
Also fits inside a wall box or an appliance control box

Din Rail Mount

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
One 17.8 mm wide DIN module that clips onto the standard 35 mm rail inside the switchboard
Shelly EM Gen4: No

Power Supply

NodOn Zigbee Smart Energy Monitor: Mains (110-240 V)
Shelly EM Gen4: Mains (110-240 V)

Smart Meter Port

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Integrations

Alexa

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not compatible with Amazon Alexa.
Shelly EM Gen4: Yes

Apple Home

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not compatible with Apple Home.
Shelly EM Gen4: Yes
Catalog note
Via Matter

Google Home

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Not compatible with Google Home.
Shelly EM Gen4: Yes

Home Assistant

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
Zigbee2MQTT supports this exact model, the SEM-4-1-00, and exposes power, voltage, current, AC frequency, power factor, apparent power and both 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 EM Gen4: Yes

Matter

NodOn Zigbee Smart Energy Monitor

Catalog note

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

Shelly EM Gen4

Yes

Manufacturer source

The manufacturer specifies Matter compatibility.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Catalog note

Matter-certified out of the box

SmartThings

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
NodOn lists SmartThings among the compatible gateways for this model, so it pairs with a SmartThings hub as a standard Zigbee 3.0 device
Shelly EM Gen4: Yes

Local Control

Local Api

NodOn Zigbee Smart Energy Monitor: No
Catalog note
A Zigbee end device with no IP stack and no documented serial interface, so there is nothing on the module itself to call directly; the data path belongs to whichever gateway hosts it
Shelly EM Gen4: Yes
Catalog note
RPC over HTTP and WebSocket, plus webhooks and scripting

Local Web Interface

NodOn Zigbee Smart Energy Monitor

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 EM Gen4

Yes

Manufacturer source

The meter has an embedded web interface.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Mqtt

NodOn Zigbee Smart Energy Monitor: No
Catalog note
No native MQTT, though Zigbee2MQTT republishes the readings
Shelly EM Gen4: Yes

Metering

Accuracy

NodOn Zigbee Smart Energy Monitor

±1%

Manufacturer source

The stated energy-measurement tolerance is one percent.

NodOn Zigbee Smart Energy Monitor manufacturer product page →

Source section: SEM-4-1-00 features and technical data
Model: NodOn Zigbee Smart Energy Monitor
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

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, over a measurement range of 50 mA to 63 A and a base current of 10 A

Shelly EM Gen4

±2%

Bidirectional Metering

NodOn Zigbee Smart Energy Monitor

Yes

Manufacturer source

Bidirectional measurement is specified.

NodOn Zigbee Smart Energy Monitor manufacturer product page →

Source section: SEM-4-1-00 features and technical data
Model: NodOn Zigbee Smart Energy Monitor
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

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 the consumed total as energy and the production side as produced_energy for this exact model

Shelly EM Gen4

Yes

Branch Ct Rating

NodOn Zigbee Smart Energy Monitor: Not applicable / unspecified
Shelly EM Gen4: Not applicable / unspecified

Included Ct Sensors

NodOn Zigbee Smart Energy Monitor: Not applicable / unspecified
Catalog note
Inline measurement through the module's own terminals, with no current transformer involved
Shelly EM Gen4: 1
Catalog note
One 50 A clamp in the box, a second CT is sold separately

Main Ct Rating

NodOn Zigbee Smart Energy Monitor: Not applicable / unspecified
Catalog note
Rated up to 63 A directly on the circuit, without a current transformer
Shelly EM Gen4: 50 A
Catalog note
80 A and 120 A current transformers also supported

Monitored Circuits

NodOn Zigbee Smart Energy Monitor

Manufacturer source

The meter monitors one circuit.

NodOn Zigbee Smart Energy Monitor manufacturer product page →

Source section: SEM-4-1-00 features and technical data
Model: NodOn Zigbee Smart Energy Monitor
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

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

Catalog note

One 1P+N circuit: the line is wired through the meter's own terminals and the neutral passes alongside, so it meters a single circuit up to 63 A

Shelly EM Gen4

Manufacturer source

Two current-transformer channels measure a single-phase supply.

Shelly EM Gen4 manufacturer product page →

Source section: Technical details: device description and main features
Model: Shelly EM Gen4
Region: Manufacturer product page; no universal regional compatibility implied
Firmware: Not specified by this source
Checked: 2026-10-04

The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load.

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

Power Factor

NodOn Zigbee Smart Energy Monitor: Yes
Catalog note
Reports voltage, current, active power, apparent power, power factor and AC frequency alongside the energy totals | Zigbee2MQTT exposes power_factor, power_apparent and ac_frequency for this exact model
Shelly EM Gen4: Yes
Catalog note
Active and apparent power and energy, plus power factor

Split Phase

NodOn Zigbee Smart Energy Monitor: No
Catalog note
Rated 110-240 V AC 50/60 Hz as a 1P+N single-phase meter, so a 120/240 V North American split-phase service with two hot legs is out of scope
Shelly EM Gen4: No
Catalog note
Single-phase device with two current channels

Three Phase

NodOn Zigbee Smart Energy Monitor: No
Shelly EM Gen4: No

Specifications for NodOn Zigbee Smart Energy Monitor versus Shelly EM Gen4
Specification	NodOn Zigbee Smart Energy Monitor	Shelly EM Gen4
Connectivity
2.4 GHz Wi-Fi	No Catalog note The 2.4 GHz radio is Zigbee (IEEE 802.15.4), not Wi-Fi	Yes Catalog note Wi-Fi 6 (802.11 b/g/n/ax) on 2.4 GHz
5 GHz Wi-Fi	No	No
Bluetooth	No	Yes Manufacturer source Bluetooth connectivity is documented. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Bluetooth 5 LE
Ethernet	No	No
Other	No	No
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, SmartThings, Jeedom and Zigbee2MQTT as compatible gateways for this model	Zigbee Hub required Catalog note Zigbee 802.15.4 and acts as a Zigbee repeater
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 for power quality values and JSON through RPC
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	30 days Manufacturer source Local storage retains at least 30 days of one-minute records. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note At least 30 days of 1-minute records 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 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 Switch a contactor from consumption thresholds or schedules
Relay Output	No Catalog note No switching output: the meter measures only and has no relay to cut a load	Yes Manufacturer source A dry-contact relay can control an external contactor. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Dry contact rated 2 A at 240 V for contactor control
Installation
Breaker Panel Install	Yes Catalog note Installed in-line inside the electrical panel on an existing circuit, next to the upstream protection device	Yes Catalog note Also fits inside a wall box or an appliance control box
Din Rail Mount	Yes Catalog note One 17.8 mm wide DIN module that clips onto the standard 35 mm rail inside the switchboard	No
Power Supply	Mains (110-240 V)	Mains (110-240 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.	Yes Catalog note Via Matter
Google Home	No Catalog note Not compatible with Google Home.	Yes
Home Assistant	Yes Catalog note Zigbee2MQTT supports this exact model, the SEM-4-1-00, and exposes power, voltage, current, AC frequency, power factor, apparent power and both 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	Yes Manufacturer source The manufacturer specifies Matter compatibility. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Matter-certified out of the box
SmartThings	Yes Catalog note NodOn lists SmartThings among the compatible gateways for this model, so it pairs with a SmartThings hub as a standard Zigbee 3.0 device	Yes
Local Control
Local Api	No Catalog note A Zigbee end device with no IP stack and no documented serial interface, so there is nothing on the module itself to call directly; the data path belongs to whichever gateway hosts it	Yes Catalog note RPC over HTTP and WebSocket, plus webhooks and scripting
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 Manufacturer source The meter has an embedded web interface. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant.
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 Zigbee Smart Energy Monitor manufacturer product page → Source section SEM-4-1-00 features and technical data Model NodOn Zigbee Smart Energy Monitor Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 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, over a measurement range of 50 mA to 63 A and a base current of 10 A	±2%
Bidirectional Metering	Yes Manufacturer source Bidirectional measurement is specified. NodOn Zigbee Smart Energy Monitor manufacturer product page → Source section SEM-4-1-00 features and technical data Model NodOn Zigbee Smart Energy Monitor Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 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 the consumed total as energy and the production side as produced_energy for this exact model	Yes
Branch Ct Rating	Not applicable / unspecified	Not applicable / unspecified
Included Ct Sensors	Not applicable / unspecified Catalog note Inline measurement through the module's own terminals, with no current transformer involved	1 Catalog note One 50 A clamp in the box, a second CT is sold separately
Main Ct Rating	Not applicable / unspecified Catalog note Rated up to 63 A directly on the circuit, without a current transformer	50 A Catalog note 80 A and 120 A current transformers also supported
Monitored Circuits	1 Manufacturer source The meter monitors one circuit. NodOn Zigbee Smart Energy Monitor manufacturer product page → Source section SEM-4-1-00 features and technical data Model NodOn Zigbee Smart Energy Monitor Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note One 1P+N circuit: the line is wired through the meter's own terminals and the neutral passes alongside, so it meters a single circuit up to 63 A	2 Manufacturer source Two current-transformer channels measure a single-phase supply. Shelly EM Gen4 manufacturer product page → Source section Technical details: device description and main features Model Shelly EM Gen4 Region Manufacturer product page; no universal regional compatibility implied Firmware Not specified by this source Checked 2026-10-04 The relay controls a contactor; its existence does not establish a suitable rating for directly switching a high-power load. Document check only; not a hands-on test or verification of every regional or firmware variant.
Power Factor	Yes Catalog note Reports voltage, current, active power, apparent power, power factor and AC frequency alongside the energy totals \| Zigbee2MQTT exposes power_factor, power_apparent and ac_frequency for this exact model	Yes Catalog note Active and apparent power and energy, plus power factor
Split Phase	No Catalog note Rated 110-240 V AC 50/60 Hz as a 1P+N single-phase meter, so a 120/240 V North American split-phase service with two hot legs is out of scope	No Catalog note Single-phase device with two current channels
Three Phase	No	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