SONOFF THR316 - WiFi Smart Switch with Temperature/Humidity Monitoring 16A

Overview

The SONOFF THR316 (TH Origin) represents the major evolution of the well-known TH10/TH16 series. This smart Wi-Fi switch transforms your conventional electrical devices into intelligent smart home equipment capable of reacting to environmental conditions. Thanks to its RJ9 4P4C interface, the THR316 connects to various sensors to monitor temperature, humidity or soil moisture, providing a complete solution for climate automation in your home.

Designed for demanding applications, this module supports a maximum load of 16A, allowing you to control heaters, dehumidifiers, fans or any equipment that requires control based on ambient conditions. Its native integration with Home Assistant, via the eWeLink add-on or ESPHome, makes it a preferred choice for open-source smart home enthusiasts looking to create sophisticated climate automations.

Key features

• Automatic environment-based control: Create up to 8 custom automation programs based on temperature, humidity and specific time periods. Your dehumidifier turns on automatically when humidity exceeds 70%, and your auxiliary heater starts when the temperature drops below 18°C. These automations run autonomously even in case of Internet connection loss, ensuring constant comfort and significant energy savings.
• Detailed history and data analysis: All temperature and humidity readings are recorded hourly for 6 months in the eWeLink cloud. View the evolution of ambient conditions by hour, day or month directly in the app. The data can be exported in Excel (.xlsx) format, allowing in-depth analysis to optimise your energy consumption, monitor storage conditions or document the performance of your HVAC equipment.
• Extended compatibility with professional sensors: The RJ9 4P4C connector supports a wide range of SONOFF sensors: THS01 for ambient temperature and humidity, DS18B20 for waterproof temperature measurement (ideal for swimming pools or aquariums), MS01 for soil moisture (smart gardening), AM2301 and Si7021. This versatility allows the system to be adapted to many applications: greenhouses, wine cellars, server rooms, fermentation chambers or smart irrigation systems.
• Home Assistant and open-source platform integration: Unlike closed proprietary solutions, the THR316 integrates natively with Home Assistant via the official eWeLink add-on or ESPHome (alternative firmware based on ESP32). This openness lets you create complex automations involving other devices, visualise your data in custom dashboards and keep full control of your information without relying on a proprietary cloud. It is also compatible with Homey Pro, Jeedom and other modern smart home platforms.
• Natural voice control: Full integration with Amazon Alexa and Google Assistant lets you not only switch the connected device on or off, but also query the current values by voice: “Alexa, what is the temperature in the greenhouse?” or “OK Google, what is the humidity in the cellar?”. This voice interaction makes day-to-day monitoring easier without having to open the app.
• Simplified professional installation: The compact form factor of the THR316 makes it easy to install in standard electrical boxes or on a DIN rail (adapter available separately). The connections are secured by screw terminals for power cables (0.5–2.5mm²), while the sensor is simply plugged in via the RJ9 connector, supporting hot-plugging. This professional design ensures a reliable, long-lasting installation compliant with European electrical standards.

Detailed technical specifications

Electrical specifications

• Power supply: 100–240V AC, 50/60Hz
• Maximum load: 16A (3680W at 230V)
• Output type: dry relay contact (NO/NC)
• Conductor cross-section: 0.5–2.5mm² (AWG 20–14)
• Stripping length: 7–8mm
• Operating temperature: -10°C to +40°C
• Operating humidity: 5–95% RH (non-condensing)

Connectivity and communication

• Microcontroller: ESP32 (dual-core, 240MHz)
• Wi-Fi: IEEE 802.11 b/g/n, 2.4GHz only
• Wi-Fi RF power: 18.56dBm (802.11b), 17.93dBm (802.11g), 19.23dBm (802.11n)
• Bluetooth: BLE 4.2 (for initial pairing)
• BLE frequency: 2402–2480MHz
• BLE RF power: 8.36dBm
• Wi-Fi range: up to 50m in open field
• Control modes: eWeLink cloud, local LAN (without Internet)

Sensor interface and compatibility

• Connector: RJ9 4P4C (supports hot-plugging)
• Compatible sensors: THS01, DS18B20, MS01, AM2301, Si7021
• Extension cable: RL560 up to 5 metres
• Limitation: only one sensor can be connected at a time
• Temperature range (THS01): -40°C to +85°C (±0.3°C)
• Humidity range (THS01): 0–100% RH (±2% RH)
• Measurement frequency: every 10 seconds (configurable)

Software features

• Mobile app: eWeLink (iOS/Android)
• Cloud storage: 6 months of hourly history
• Data export: Excel format (.xlsx)
• Automation programs: up to 8 configurable
• Trigger conditions: temperature, humidity, time range
• Smart scenes: interaction with other eWeLink devices
• LAN control: works without Internet connection
• Firmware: OTA updates (Over-The-Air)
• Compatible with: Home Assistant (eWeLink add-on, ESPHome), Homey Pro, Jeedom, IFTTT

Physical characteristics

• Dimensions: 105 x 64 x 39mm
• Weight: approx. 132g
• Mounting: standard wall box or 35mm DIN rail (with adapter)
• Enclosure material: flame-retardant PC V0
• Protection rating: IP20 (indoor use only)
• Physical button: Wi-Fi configuration and manual control
• Indicator LED: Wi-Fi status and operating status