Third Reality Smart Plug E3
Last updated October 2026

Third Reality Smart Plug E3

Real-time energy metering, a mesh repeater and a 16 A rating in a small Type F plug, provided you already run a Zigbee hub.

4.2
35 ratings
€14.99

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Launch Year: 2026

Model: 3RSPE02065Z

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Our review

Third Reality Smart Plug E3 Review: A Compact Zigbee Meter for the Whole Home

The verdict

The Third Reality Smart Plug E3 is an EU Type F Zigbee 3.0 plug built around energy metering: it reports power, voltage, current, power factor and accumulated energy in real time, and doubles as a Zigbee router. It is a sound choice for a Home Assistant, SmartThings or Alexa household that already has a Zigbee coordinator, while anyone without one will need a hub first. At a budget-friendly price it is one of the cheaper ways to add metering to an existing Zigbee mesh.

Best for
  • Home Assistant and Zigbee2MQTT users
  • SmartThings and Alexa households
  • Energy monitoring on a budget
  • Extending an existing Zigbee mesh

Pros

  • Real-time power, voltage, current and energy metering calibrated to about one percent
  • 16 A and 3680 W capacity on a 100 to 250 V supply
  • Works as a Zigbee router to extend the mesh
  • Local control over Zigbee with no cloud account
  • Physical on/off button and configurable power-on state
  • Compact 55 mm Type F body

Cons

  • Needs a Zigbee hub or coordinator, with no Wi-Fi, Bluetooth, Z-Wave or Thread radio
  • Apple Home, Google Home and Matter only through the Smart Bridge MZ1, sold separately
  • No overcurrent or overheat cut-off listed in the manual
  • No IP rating, so indoor use only
  • No USB charging port

Who is the Third Reality Smart Plug E3 for?

The E3 suits a home that already speaks Zigbee. It pairs with a Zigbee coordinator such as an Echo 4th Gen or Echo Plus, a SmartThings 2015/2018 hub, an Aeotec Smart Home Hub, Hubitat, Homey, a Home Assistant setup running ZHA or Zigbee2MQTT, or Third Reality's own hub and Smart Bridge. Because the plug is powered all the time, it also works as a router that extends the mesh for other Zigbee devices. The 16 A rating and 3680 W maximum load cover most household appliances, and the 55 mm body is compact enough for a standard wall outlet.

What the Third Reality Smart Plug E3 offers

The headline feature is metering: the plug exposes power, voltage, current, AC frequency, power factor and total energy, with Third Reality claiming factory calibration to about one percent. Zigbee2MQTT and ZHA also expose power-rise and power-drop thresholds, so an automation can react the moment a washing machine or a fridge changes state. A physical button toggles the relay by hand, the plug remembers its on or off state after a power cut on supported platforms, and it can run in a metering-only mode that keeps the relay on. Firmware updates arrive over the air without switching the relay off. The plug is white, uses the EU Type F socket, and works over the 100 to 250 V range.

What to know before you buy

This is a Zigbee end device, not a Wi-Fi plug: it needs a Zigbee coordinator before it can be used at all, and it has no Wi-Fi, Bluetooth, Z-Wave or Thread radio of its own. Apple Home, Google Home and Matter are reachable only through Third Reality's Smart Bridge MZ1, sold separately, which republishes the plug over Matter; Alexa and SmartThings work directly through their own Zigbee hubs. The manual lists zero-cross switching and a configurable power-on state but no overcurrent or overheat cut-off, so an automation that watches power is the safety layer here. There is no IP rating, which means indoor use only, and no USB charging port.

Is the Third Reality Smart Plug E3 worth it?

For a Zigbee household the E3 packs the three things that matter into one small plug: accurate metering, a physical button with local control, and a repeater that strengthens the network. It is a budget-friendly alternative to metering plugs that cost considerably more, and its Type F format fits most European outlets. The trade-off is the hub requirement and the indirect route to Apple Home and Google Home. If you are already running Zigbee, it is an easy recommendation; if you are starting from scratch, budget for a coordinator as well.

Frequently asked questions

Does the Third Reality Smart Plug E3 need a hub?

Yes. It is a Zigbee 3.0 end device and needs a Zigbee coordinator, such as an Echo 4th Gen or Echo Plus, a SmartThings 2015/2018 hub, an Aeotec Smart Home Hub, Hubitat, Homey, a Home Assistant setup with ZHA or Zigbee2MQTT, or a Third Reality hub.

Does it work with Home Assistant?

Yes. Third Reality documents both ZHA and Zigbee2MQTT, and Zigbee2MQTT lists a converter for this exact model with switch, power, voltage, current, energy, power factor and AC frequency entities.

Does it monitor energy consumption?

Yes. It reports real-time power, voltage, current, power factor and total energy, and Third Reality states the meter is factory calibrated to about one percent.

Does it work with Apple Home, Google Home or Matter?

Only through Third Reality's Smart Bridge MZ1, sold separately, which republishes the Zigbee plug over Matter. The plug itself is not a Matter or HomeKit device.

What is the maximum load?

It is rated at 16 A and up to 3680 W on a 100 to 250 V supply, which covers most household appliances.

Does it extend the Zigbee network?

Yes. Because it stays powered, the E3 acts as a Zigbee router and repeats the signal for other Zigbee devices in the mesh.

Company
Third Reality logo

Third Reality

4.1/ 5 avg ratingChina flagHeadquartered in China

Third Reality, often styled THIRDREALITY, makes affordable Zigbee and Matter smart home accessories such as smart switches, plugs, motion and contact sensors, and night lights. Its devices are popular with SmartThings, Hubitat and Home Assistant users looking for low-cost Zigbee gear. Third Reality focuses on simple, budget-friendly automation building blocks.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Weather Resistance

NO

The listing's international protection rating row is empty and THIRDREALITY publishes no IP rating: the manual gives an indoor operating range of -10 to 40 C and 5 to 90% relative humidity.

Dimensions

2.2 × 2.2 × 3.1 in 55 × 55 × 79.6 mm

Weight

2.8 oz 80 g

Available in colors

NO

The E3 is sold in white only; the listing lists Colour: white and there are no other colour variants.

Plug Format

Type F

Maximum Load Power

3680W

Maximum Load Current

16A

Load Voltage

100 - 250V

Overheat/Overload Protection

NO

The manual lists zero-cross switching, a 16 A maximum load and a configurable power-on state, but no overcurrent or overheat cut-off.

Energy Monitoring

YES

Real-time power, voltage, current, power factor and energy metering, factory calibrated to +/-1%, exposed in Zigbee2MQTT and ZHA.

USB Charging

NO

2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

Zigbee Hub required

Zigbee 3.0 end device: it pairs to a Zigbee coordinator such as an Echo 4th Gen or Echo Plus, SmartThings 2015/2018, Aeotec, Hubitat, Homey or the THIRDREALITY Hub/Smart Bridge.

Thread Protocol

NO

Google Home

Smart Bridge MZ1 required

THIRDREALITY's Smart Bridge MZ1, sold separately, republishes Third Reality Zigbee end devices over Matter, and the E3 listing names Bridge MZ1 as a supported platform.

Alexa

YES

Pairs directly to the built-in Zigbee hub of an Echo 4th Gen, Echo Plus 1st/2nd Gen, Echo Show 10 or Echo Studio and is then controlled by Alexa voice.

Apple HomeKit

Smart Bridge MZ1 required

The E3 is Zigbee, not a HomeKit accessory: it reaches the Apple Home app through THIRDREALITY's Smart Bridge MZ1, sold separately, which bridges Third Reality Zigbee devices over Matter.

Samsung SmartThings

YES

THIRDREALITY lists the SmartThings 2015/2018 hubs and the Aeotec Smart Home Hub among the Zigbee coordinators the E3 pairs with.

Home Assistant

YES

Zigbee2MQTT lists a converter for this exact model and THIRDREALITY documents ZHA and Zigbee2MQTT support.

Matter

Smart Bridge MZ1 required

The E3 is a Zigbee device, not a Matter one: THIRDREALITY's Smart Bridge MZ1 is a Zigbee to Matter bridge and the listing names it as supported for the E3's metering.

On/Off Button

YES

A physical button on the face toggles the relay; a press and hold of more than 10 seconds factory-resets it and starts pairing.

Zigbee Router

YES

Acts as a Zigbee repeater, extending the meshes range while powered.

Automations

YES

Schedules, timers and grouping through the Zigbee hub or app, plus power rise and drop thresholds exposed in Zigbee2MQTT.

Local Control

YES

Controlled locally over Zigbee through ZHA or Zigbee2MQTT, with no cloud account.

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Required to work

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Why it needs a Zigbee coordinator

The Third Reality Smart Plug E3 speaks Zigbee, not Wi-Fi. On its own it cannot reach your phone, your voice assistant or any automation: it needs a Zigbee coordinator to join. These are the ones in our catalog that can run it.

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