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Sonoff TH20 Origin (R3) WiFi smart relay (230V/16A) with sensor input (THR320)

Sonoff THR320 is the 20A version of the new TH R3 Origin product, which is the new 2022 version of the Sonoff TH10/TH16 Wi-Fi smart relay series.

It supports 230V (max. 20A) switching and it can be controlled remotely from a mobile phone via the Internet and can be set for scheduled switching. You may connect temperature and humidity sensor or soil moisture sensor to it, and sensor data based automatic on/off switching and notifications can also be set.

It records the measured data in the cloud, and 6 months of historical sensor data can be seen as a graph in the app and on the eWeLink web UI.

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Factory SKU ID:
Supported protocols:
in stock (24 pcs)

The Sonoff THR320 is the new TH Origin R3 version of the Sonoff TH smart relay family. The THR320 is a WiFi enabled, remotely controllable smart relay that can be connected to 230V (max. 20A) via the internet from a mobile phone. Also a thermometer, humidity sensor and soil moisture sensor can be connected to THR320, and can also be controlled automatically based on measured temperature/humidity/soil moisture data. Instead of the jack plug connector of the previous R2 version, the R3 version is now equipped with an RJ9 connector socket. One of the new features of the R3 version is that the measured data is uploaded in the cloud and the app can also display a historical data of the previous 6 months.

Compatible with the following sensors:

  • Sonoff THS01 temperature and humidity sensor (suggested);
  • Sonoff SI7021 temperature and humidity sensor; 
  • Sonoff AM2301 temperature and humidity sensor; 
  • Sonoff DS18B20 temperature sensor (waterproof);
  • Sonoff MS01 soil moisture sensor. 

Operating modes can be set in the eWeLink app:

  • Manual: the device can be switched on/off from the eWeLink app by the user manually
  • Automatic: temperature/humidity/soil moisture (only one can work at a time) values can be set for multiple times of day and periods and the relay status will change accordingly based on the set values

The THR320 is able to send a push notification if the relay status changes or the measured value is below/above the set limit.


  • humidification or dehumidification control
  • fan control
  • socket control
  • electric floor and other heater automation
  • pool pump control
  • jakuzzi automation
  • irrigation system control

DIN rail mountable

The Sonoff THR320 has a DIN rail adapter for mounting the product in an electric distribution box.

No hub required

Sonoff Wi-Fi devices can be controlled directly and without a hub through your smartphone with eWeLink App.
Manage and control the all smart devices in your home, set quick profiles, scenes, schedules, and adjust settings wherever you are through the Cloud access.


  • Working on 2.4 GHz Wi-Fi network
  • Now, add device fast and easy via Bluetooth connection, using eWeLink App

    Product features:

    • Status check – The mobile App shows the current status of the relay (on or off);
    • Remote ON / OFF – Anytime, anywhere, from now on you can turn all your appliances on and off remotely.
    • Data history – Half a year of sensor measurement data are displayed in the mobile App in a graph;
    • Timer – Various timer functions: single time, scheduled turn on/off, countdown/timer.
    • Real-time temperature and humidity display (in app) – When THS01 or SI7021 temperature and humidity sensor is connected
    • Real-time temperature display (in app) – When adding DS18B20 waterproof thermometer
    • Real-time soil moisture display (in app) – When soil moisture sensor MS01 is connected
    • Momentary switching mode (inching) – e.g. 0,5 or 1 second
    • Share control – Control the device together with your family
    • Groups, rooms – Organise your Sonoff and SmartWise smart devices into groups and rooms in the eWeLink app
    • Smart Control (Scene) – You can also use the Smart Control / Scene eWeLink app feature to create conditional controls between different Sonoff / SmartWise devices. For example, you can switch a Sonoff S26 outlet based on the data from a temperature or humidity sensor connected to a THR320 relay;
    • Compatibility – Works perfectly with Amazon Alexa, Google Assistant, IFTTT and Google Nest
    • Sonoff and its sister brand SmartWise devices are compatible with each other, both using the eWeLink factory app

Product type:
smart WiFi relay compatible with sensors
Device power supply:
100V-240V AC
230V AC (live and neutral)
DIN rail compatible:
Embedded relay:
Dimmer feature:
Power consumption metering:
Number of gangs / circuits:
NO/NC switch:
Rated voltage (output):
100V-240V AC
Rated current (output):
Physical on/off button on device:
External switch supported:
2-way or 3-way switching:
Momentary switching (inching):
Overload protection:
Overheat protection:
Wi-Fi standards:
802.11 b/g/n (2.4GHz)
RF transmitter / receiver:
Bluetooth pairing with phone
Controllable from internet:
Manufacturer smartphone app:
yes, free app: eWeLink (Android, iOS)
Web admin interface:
on/off mode (only with subscription, Premium feature)
Voice control:
Amazon Alexa and Google Assistant compatible
Cloud mode:
default mode is connecting to the eWeLink cloud
LAN mode:
yes, if the connection with the eWeLink cloud is disconnected, limited features
REST API support:
MQTT support:
Schedulers, timers:
yes, 8 timings on the device in offline mode, (loop control supported), any further timing can be run from the cloud in online mode
Notification functions:
eWeLink app notification on smartphone for on/off, or for temperature threshold
temperature data also logged to the cloud, yes: on/off history in the app
130 g/pcs
Package offers
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Sonoff TH20 Origin (R3) WiFi smart relay (230V/16A) with sensor input (THR320)
Sonoff TH20 Origin (R3) WiFi smart relay (230V/16A) with sensor input (THR320)