
SONOFF Smart Temperature and Humidity Monitoring Switch 20A | Sonoff THR320D
The SONOFF THR320D (TH Elite) is a Wi-Fi smart switch that reads temperature and humidity from a plug-in sensor and switches a connected load of up to 20 A automatically. It also has a dry contact output and an LCD screen that shows the current readings.


Available options: No Sensor, with Temperature and Humidity Sensor THS01, with Waterproof Temperature Sensor WTS01, or with Soil Moisture Sensor MS01.
20 A load switching: The switch is rated 100–240 V AC, 20 A max, so it can control high-load equipment directly. Automations turn the load on or off when the temperature or humidity crosses the limits you set.
Dry contact output: Besides the 20 A output, it has a dry contact output rated 5–30 V, 1 A max. A dry contact is a volt-free switch, which is used to give an on/off signal to another device's control input instead of feeding it power.
LCD display: The built-in LCD shows real-time temperature and humidity and updates every 5 seconds, so you can check the readings on the device without opening the app.
History and export: The app keeps up to 6 months of temperature and humidity history, viewable by hour, day or month, and the data can be exported as an .xlsx file for further analysis.
Automation programs: You can create up to 8 automatic control programs based on temperature or humidity thresholds, so the connected device runs only when it is needed.
Works with
Sensors THS01, DS18B20 and MS01 (RJ9 sensor socket), Amazon Alexa and Google Assistant voice control.
Good to know
The THR320D connects over 2.4 GHz Wi-Fi only. The "No Sensor" option does not include a sensor; a sensor is needed for temperature, humidity or soil-moisture readings.
Technical Specifications
| Model | THR320D |
| Input / Output | 100–240 V~ 50/60 Hz, 20 A max |
| Dry Contact Output | 5–30 V, 1 A max |
| MCU | ESP32 |
| Wi-Fi | IEEE 802.11 b/g/n, 2.4 GHz |
| Display | LCD, updates every 5 seconds |
| Data History | Up to 6 months, export to .xlsx |
| Automation Programs | Up to 8 |
| Supported Sensors | THS01, DS18B20, MS01 |
| Sensor Socket | RJ9 |
| Voice Assistants | Amazon Alexa, Google Assistant |
| Working Temperature | -10 °C to 40 °C |
| Working Humidity | 5% – 95% RH, non-condensing |
| Dimensions | 98 × 54 × 31 mm |
| Casing Material | PC V0 |
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