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Sonoff 4CH (R3) WiFi smart 230V AC relay switch with 4 channels

Sonoff 4CH R3 is Sonoff’s 4-channel smart switch relay with 230V AC switching capability. This product version is only equipped with WiFi (no 433MHz RF receiver!), and it is remotely contollable via Internet from eWeLink smartphone app.It only supports 230V AC switching, dry contact switching is not supported.

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Factory SKU ID:
Supported protocols:
in stock (30+ pcs)

Sonoff 4CH is the 4-channel standard 230V AC smart relay of the smart home product manufacturer, with embedded WiFi chip and compatibility with eWeLink app.

It uses your local WiFi network to connect to eWeLink cloud, so it is remotely controllable from eWeLink smartphone app. Also, you may create scheduled ON / OFFs, timers and set loop on / offs. eWeLink app also supports scenes, which are automations with triggers / conditions and automation actions. 

This product verson does NOT have an RF 433 receiver, so it cannot be remote controlled from a near RF wireless switch or from an RF remote controller.
Sonoff 4CH (R3 version) is a popular choice for switching 4 independent gangs of 230V AC devices such as lights, sockets, and other 230V AC electronic devices. It can NOT be used for dry contact switching (for garage doors or motoric gates)!

All you need is an iOS or Android smart phone with a data plan or WiFi-based internet connnection, and here you are, you can remotely turn ON / OFF the 4 gangs of the relay. You may also share app access with others. Use it wisely to save on the energy bill, automate ON/OFF at certain times, set loop ON/OFF timers for your devices. 

You may also active an INTERLOCK mode to allow only usage of 1 gang at a time, so you may use it to operate 230V AC bi-directional motors.
Important: Sonoff 4CH can only be used to switch 230V AC to all 4 channels, it cannot be used to switch DC or dry contact! 
You can install Sonoff 4CH R3 into the DIN-rail of an electric cabinet.

Differences between 4CH R3 and 4CH PRO R3 relays:
  • 4CH R3 relay can be only operated from 230V AC power input, but 4CH PRO R3 can be operated from 230V AC or 9V-23V DC
  • 4CH R3 relay is a one-phase 230V AC relay switch, but 4CH PRO R3 has 4 independent channels with NO/NC switching capability, supporting switching any voltage (AC/DC) or dry contact. 
  • 4CH R3 relay uses only WiFi , but 4CH PRO R3 has not just WiFi but 433MHz RF receiver, too, so it can be remotely controlled from a 433MHz RF remote controller or wireless RF wall switch.

Product features:

  • Remote ON / OFF – Anytime, anywhere, from now on you can turn all your appliances on and off remotely.
  • Supports 4 channels - 4 independent relays to switch 230V AC
  • Momentary switching mode and auto-off and auto-on is also available 
  • Interlock mode is available to support AC motor control
  • Can be installed on a DIN-rail
  • Control the 4 channels independently
  • Physical on/off buttons on the device
  • Mobile App – free iOS and Android mobile App: eWeLink
  • Sync status – Check real-time relay status (ON or OFF) from the mobile App
  • Scheduled on/off – Various timer functions: single time, scheduled turn on/off, countdown/timer.
  • Share control – Control the device together with others
  • Group control – Turn ON / OFF a group of devices with one tap
  • Smart scene – Triggered ON/OFF by temperature, humidity other sensors or other smart devices
  • Compatibility – Works perfectly with Amazon Alexa, Google Assistant, IFTTT and Google Nest

Product type:
four circuit smart WiFi relay for 230V switching
Device power supply:
100V-240V AC
230V AC (live and neutral)
DIN rail compatible:
Embedded relay:
Dimmer feature:
Power consumption metering:
Number of gangs / circuits:
NO/NC switch:
Rated current (output):
3500W (16A) / channel, 3500W (16A) total
Physical on/off button on device:
4 buttons
External switch supported:
2-way or 3-way switching:
Momentary switching (inching):
Interlock mode:
Overheat protection:
Wi-Fi standards:
802.11 b/g/n (2.4GHz)
RF transmitter / receiver:
Controllable from internet:
Manufacturer smartphone app:
yes, free app: eWeLink (Android, iOS)
Web admin interface:
on/off mode (only with subscription, Premium feature)
Voice control:
Amazon Alexa and Google Assistant compatible
Cloud mode:
default mode is connecting to the eWeLink cloud
LAN mode:
yes, if the connection with the eWeLink cloud is disconnected, limited features
REST API support:
MQTT support:
Supported integrations:
Amazon Echo, Echo Dot, Amazon Tap, Google Home, Google Nest, IFTTT (IFTTT integration with subscription, Premium feature)
Schedulers, timers:
yes, 8 timings on the device in offline mode, any further timing can be run from the cloud in online mode
Notification functions:
eWeLink app notification on smartphone
yes: on/off history in the app
220 g/pcs
Package offers
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Sonoff 4CH (R3) WiFi smart 230V AC relay switch with 4 channels
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