SONOFF TH Origin THR316 / THR320 Wi-Fi Switch
A greenhouse, a spare room or a reptile shelf can drift out of range while nobody is home. The TH Origin reads temperature and humidity and switches the connected appliance when your threshold is met, keeping six months of hourly readings. For anyone wiring a heater, fan or humidifier into the app.
Temperature and Humidity That Switch a Load
✅ Acts on a reading Set a temperature or humidity threshold and the switch turns the connected heater, fan or humidifier on or off by itself.
✅ Tells you when it moves A push notification reaches the phone when the reading crosses your limit or the relay changes state.
✅ Two load ratings The THR316D handles up to 16 A and the THR320D up to 20 A, so a heavier appliance gets its own model.
✅ History kept for months Hourly readings for the past six months show how a room behaved overnight when nobody was watching it.
A heat mat for seedlings needs an air temperature, a bathroom needs a humidity figure, and a potting bench needs moisture at root level. Each of those jobs runs on the same switch with a different sensor on the RJ11 lead, and the sensor can be swapped while the unit is powered.
Two models share the TH Origin body: the THR316D is rated to 16 A and the THR320D to 20 A, both on 100 to 240 V AC at 50 or 60 Hz. Match the model to the appliance rather than to the room.
In the app, temperature, humidity, on and off can each be set as a trigger, and on, off or invert as the action. Works with Amazon Alexa and Google Assistant for voice, and the device can be added to Home Assistant through the eWeLink add-on.
One thing to settle before buying: this is a wired switch, with mains voltage reaching both its input and the appliance it controls, so the installation belongs with someone comfortable working on that. The LCD shows the reading on the unit, and the housing carries CE, FCC and RoHS marks.
Technical details
- Type: Wi-Fi temperature and humidity switch
- Models: THR316D (16 A) and THR320D (20 A)
- Chip: ESP32
- Power: 100-240 V AC, 50/60 Hz
- Max load: 16 A or 20 A, depending on model
- Sensors: THS01, DS18B20, MS01
- Sensor connector: RJ11, hot-pluggable
- Display: LCD
- History: Six months of hourly temperature and humidity data
- Certification: CE, FCC, RoHS
Choose the 16 A or 20 A model and the sensor your room needs.
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