Product description: Shelly 1 Gen4 - relay AC 110 - 240 V, DC 24 - 48 V, WiFi / Bluetooth / ZigBee / Matter 16 A - Android / iOS application
Shelly 1 Gen4 is a modern single-channel relay equipped with a voltage-free contact and a built-in temperature sensor. It is perfect for automating devices, doorbells, garage doors, lighting, cooling and heating systems, as well as irrigation systems. Thanks to the support of communication protocols such as WiFi, ZigBee, Bluetooth and Matter, it provides excellent compatibility with SmartHome ecosystems. Shelly 1 Gen4 supports voltages ranging from 110 V to 240 V AC or from 24 V to 48 V DC and features a fast ESP‑Shelly‑C38F processor . Thanks to its compact size, the relay can be mounted in standard flush-mounted boxes.
Shelly 1 Gen4 - relay AC 110 - 240 V, DC 24 - 48 V, WiFi / Bluetooth 16 A - Android / iOS application.
The connection diagram is shown on the module housing.
Shelly 1 Gen4 Key Features
- Multi-protocol connectivity : WiFi, Bluetooth, ZigBee and Matter support
- Voltage-free contact : possibility of controlling, among others, gates, boilers and cooling and heating systems
- Wide range of supported output voltage : up to 16 A for 240 V and 10 A for 30 V
- ESP‑Shelly‑C38F composite processor : fast response, 8 MB memory, MQTT and REST API support
- Voice assistant integration : compatible with Amazon Alexa, Google Assistant and Samsung SmartThings
- Extensive local control options : schedules, scenes, scripts, KNXnet/IP, HTTPS, MQTTS
- Compact design : easy to install in standard installation boxes
Shelly 1 Gen4 module connection diagram
When installing Shelly 1 Gen4, remember to disconnect the power supply in the circuit. The module's mounting location should be dry, safe from moisture and well ventilated. The device being installed should be located away from any heat sources, and unauthorized persons should not have access to the controller.
The module is equipped with six screw connectors that allow for permanent and safe connection of wires using a classic screwdriver. Below is a description of the functions of each connector:
- O - switching output (for connecting the load)
- L - module power supply: 110 V to 240 V AC or 12 V to 48 V DC (positive pole)
- N - neutral (negative pole)
- SW - control input, enabling the connection of a button or wall switch
- Debug port - used for technical diagnostics, testing and software updates
Remember to exercise extreme caution and take appropriate safety precautions when working with electrical equipment.
Basic connection diagram of the Shelly 1 Gen4 controller.
Shelly 1 Gen4 has six screw connectors enabling permanent and secure cable connection.
Shelly 1 Gen4 Module Configuration
- Connection to the module network:
After connecting the Shelly 1 Gen4 module to power, you need to connect to its temporary WiFi network named "Shelly1G4-xxxxxxxxxxxx " , where "xxxxxx" is the unique serial number of the device. - Download the app:
Download the Shelly app from Google Play or App Store and install it on your smartphone. - Initial setup in the app:
Once you have launched the Shelly app, select the default name for your device to begin setup. Then follow the on-screen instructions to select your home WiFi network and enter your password. - Alternative browser configuration:
Once you have connected to the Shelly network, open your web browser and enter the address: http://192.168.33.1.
On the configuration page that appears, select your WiFi network and enter the password so that the module can connect to your home wireless network.
Shelly 1 Gen4 Relay Technical Specification
- Model: S4SW-001X16EU
- Supply voltage: 110V to 240V AC / 12V DC / 24V to 48V DC
- Power consumption: < 1 W
- Control output type: voltage-free contact
- Maximum switching voltage AC: 240 V
- Maximum switching voltage DC: 30 V
- Maximum AC load: 16 A
- Maximum DC load: 10A
- Communication: WiFi, Bluetooth, ZigBee, Matter
- WiFi protocol: 802.11 b/g/n, 2.4 GHz band
- Bluetooth Protocol: 5.0
- ZigBee protocol: 802.15.4
- Connectors: 6 screw terminals (O, L1/L, SW, debug port)
- Maximum load power: 3680 W (at 230 V)
- Supported protocols: HTTP, HTTPS, MQTT, MQTTS, UDP, WebHooks, KNXnet/IP
- Interface: Built-in web interface
- Integrations: compatible with Google Home, Amazon Alexa and Samsung SmartThings, Apple HomeKit and Home Assistant
- Operating temperature: -20°C to 40°C
- Dimensions: 42 x 37 x 16 mm
- Weight: 63 g
The Shelly 1 Gen4 module has a debug port for diagnostics, firmware updates and service tests.
| Comparison of Shelly Gen1, Gen2, Gen3 and Gen4 Devices | ||||
|---|---|---|---|---|
| Feature | Shelly Gen 1 | Shelly Gen 2 (Plus/Pro, Mini) | Shelly Gen 3 | Shelly Gen 4 |
| WiFi | 2.4 GHz WiFi | 2.4 GHz WiFi | 2.4 GHz WiFi | 2.4 GHz WiFi (WiFi 6) |
| Processing Power | Basic | More powerful processors than Gen 1 | Shelly chip for optimal performance | Most advanced processing power |
| Memory | Basic memory | Up to 4 MB Flash (8 MB in PRO) | 8 MB Flash, 256 kB RAM | More than Gen 3 (512 kB RAM) |
| Bluetooth | No | Yes - for easy setup | Yes - for easy setup | Yes - for easy setup |
| Scripting and Automation | No | Enhanced automation capabilities | Advanced scripting and automation | Advanced scripting and automation |
| Energy Monitoring | Basic (selected models) | Extended monitoring (some models) | Advanced monitoring and safety | Advanced monitoring and safety |
| Device Control | MQTT, CoAP, HTTP Webhooks | MQTTS, HTTP/HTTPS Webhooks, MQTT + Cloud | MQTTS, HTTP/HTTPS Webhooks, MQTT + Cloud | MQTTS, HTTP/HTTPS Webhooks, MQTT + Cloud |
| Virtual Components | No | Available (PRO only) | Supported | Supported |
| KNX Support | No | Yes (selected PRO only) | Yes (selected devices) | Yes (selected devices) |
| Bluetooth Gateway | No | Yes (except BLU TRV, Gen 3 gateway required) | Yes (except BLU TRV, Gen 3 gateway required) | Yes (except BLU TRV, Gen 3 gateway required) |
| KVS (Key-Value Store) | No | Yes | Yes | Yes |
| Timer Loop | No | Auto ON/OFF simultaneously | Auto ON/OFF simultaneously | Auto ON/OFF simultaneously |
| Range Extender | No | Yes | Yes | Yes (WiFi and ZigBee) |
| Simultaneous AP and WiFi | No | Yes | Yes | Yes |
| Ethernet | No | Yes (PRO only) | Yes (PRO only) | Yes (PRO only) |
| Intended Use | Basic home automation | More features, scripting, better hardware | Advanced automation, future-proof | Full automation, maximum flexibility |
| Protocol Support | None | BTHome, MQTT+Cloud, KNX (PRO) | BTHome, KNXnet/IP, Matter, MQTT+Cloud, Virtual Components | BTHome, Matter, ZigBee, TCP/IP Modbus, KNXnet/IP, MQTT+Cloud |
Useful links |
