🌡️ SONOFF THR320 Origin — 20A WiFi Smart Switch with Temperature & Humidity Control
Automate heating, cooling, and humidity control based on real sensor data. The SONOFF THR320 Origin is a 20A WiFi smart switch with an RJ9 sensor port — plug in a temperature, humidity, or soil moisture sensor (sold separately) and create automations like "If temperature drops below 18°C → turn on heater" or "If humidity exceeds 70% → turn on extractor fan." 6-month data history via eWeLink app. No LCD display — app-only readings. ESP32 chip. MPN: THR320.
Choose your TH controller:
⚡ Key Features
- 20A / 4,400W Maximum Load — handles heaters, geysers (under 20A), dehumidifiers, aircon, extractors, and high-power appliances
- RJ9 Sensor Port — plug in THS01 (temp+humidity), DS18B20 (waterproof temp), or MS01 (soil moisture); the TH switch reads sensor data and automates accordingly
- Auto-Mode (Thermostat/Humidistat) — set target temperature or humidity; the relay switches on/off automatically to maintain your setpoint
- 6-Month Data History — view temperature, humidity, or moisture data over 6 months in the eWeLink app; export for analysis
- Schedules & Smart Scenes — combine time-based schedules with sensor triggers; "Weekdays 6 AM–8 AM: if temp < 20°C → heater on"
- ESP32 Chip — fast, reliable WiFi; supports OTA firmware updates
- No LCD Display — all readings via eWeLink app only (for LCD, choose the TH Elite 20)
- DIN Rail Mountable — professional DB board installation
- RL560 Extension Cable — extend THS01/WTS01 sensors up to 60m, MS01 up to 10m using the optional RL560 RJ9 extension
- Home Assistant — eWeLink add-on, SonoffLAN, Tasmota, ESPHome
- Voice Control — Alexa, Google Assistant
🏠 Perfect For
Smart Heating
Plug in THS01 sensor. Set target temp to 21°C. The THR320 turns your heater on when it's cold and off when the target is reached. Smart thermostat for any heater.
Humidity Control
Use THS01 to monitor humidity. "If humidity > 65% → turn on extractor fan." Prevent mould in bathrooms, laundries, and storage rooms automatically.
Smart Irrigation
Plug in MS01 soil moisture sensor. "If soil moisture < 30% → turn on irrigation pump." Water only when your garden actually needs it.
Farming & Greenhouses
Maintain precise temperature and humidity for poultry, reptiles, seedlings, or mushroom growing. The 20A relay handles industrial heaters and fans.
🔗 Compatible Sensors (Sold Separately)
SONOFF THS01
Temperature & humidity sensor. ±0.3°C / ±3% RH accuracy. Indoor use. RJ9 plug-and-play.
View Sensor →DS18B20 Waterproof Probe
Stainless steel waterproof temperature probe. -55°C to +125°C. Ideal for geysers, pools, pipes, outdoor.
View Sensor →SONOFF MS01 Soil Moisture
Soil moisture sensor for automated irrigation. Weatherproof. Trigger watering based on soil dryness.
View Sensor →📋 Technical Specifications
| Product | SONOFF THR320 Origin Smart Switch |
| MPN / Model | THR320 |
| Max Load | 20A / 4,400W @ 220V AC |
| Input Voltage | AC 100–240V, 50/60Hz |
| Sensor Port | RJ9 (sensor sold separately) |
| Compatible Sensors | THS01 · DS18B20 (waterproof) · MS01 (soil moisture) |
| Display | None (app-only readings) |
| Data History | 6 months via eWeLink app |
| Chip | ESP32 |
| WiFi | 2.4 GHz 802.11 b/g/n |
| Mounting | DIN rail (35 mm) |
| Home Assistant | eWeLink add-on · SonoffLAN · Tasmota · ESPHome |
| Voice Control | Amazon Alexa · Google Assistant |
| Warranty | 1 Year Manufacturer Warranty |
❓ Frequently Asked Questions
Is a sensor included?
What's the difference between THR320 and TH Elite 20?
Can I use it as a smart thermostat?
Can I extend the sensor cable?
🤝 Need Help? We're Here for You!
Visit Us
8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709
Automate by Temperature, Humidity & Moisture
20A smart switch with sensor control. Pair with any RJ9 sensor.
