Sonoff 4CHR3 is a 4-gang Wi-Fi Smart Switch with optional RF433 Connectivity

ITEAD Studio introduced Sonoff 4CH 4-gang WiFi + RF switch in 2017 with a DIN rail  enclosure, compatible with eWelink Android/iOS app, and offering three modes of operations selectable from physical switches on the unit:

  • Self-locking mode – Each relay can be turn on and off independently.
  • Interlock mode – Only one of the relay can be turned on at a given time. For example if R1 is on, and your press R2 to turn it on, R1 will automatically turn off
  • Inching mode – A button press on the unit, mobile app, or RF/WiFi remote control will turn on the relay for X seconds as defined by K6 “delay” switch within a 0.5 to 3600 seconds range.

The company has now launched the similar SONOFF 4CHR3 4-gang WiFi switch and 4CHPROR3 model that adds 433MHz connectivity, with the main difference again the previous generation being the ability to select modes of operation right from eWelink mobile app.

Sonoff 4CHR3 & 4CHPROR3

Sonoff 4CHR3 & 4CHPROR3 specifications:

  • Connectivity- 2.4GHz 802.11b/g/n WiFi 4; 4CHPROR3 only: 433 MHz
  • Voltage Range
    • 4CHR3 – 100-240V AC 50/60Hz
    • 4CHPROR3 – 100-240V AC 50/60Hz; DC: 9-23V
  • Max. Load
    • 4CHR3 – 10A/2200W per gang;  16A/3500W total
    • 4CHPROR3 – 10A/2200W per gang; 40A/8800W total
  • Dimensions – 145 x 90 x 34 mm (PC V0 enclosure)
  • Temperature Range – -10ºC to +40ºC
  • Humidity – 5%-95%RH, Non-condensing
  • Certifications – FCC & CE

4CHR3 vs 4CHR2

Another difference against 4CHR2 is that the connectors are now fully covered for increased safety. The comparison below shows 4CHR2’s modes could already be controlled from eWelink app, but not 4CHPROR2.

4CHR3 vs 4CHPROR3 vs 4CHR2 vs 4CHPROR2 comparisonJust like any other eWelink controlled devices, 4CHR3 / 4 CHPROR3 smart switches can also be controlled via voice commands through Alexa or Google Home smart assistants.

Sonoff 4CHR3 is up for pre-order for $18.50, and 4CHPROR3 for $28 on ITEAD store, and shipping is scheduled to start on May 6. Note that while 4CHPROR3 supports RF remote, it does not ship with one, but you can purchase one separately for $4.50.

Thanks to Andreas for the tip.

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Ygor Almeida
4 years ago

Too bad its still unclear to me on how to use with my region.

I have 220v in my city

Its 2 phase with 110v each. Not 220 with phase+gnd+neutral

It works with 220v or 110v but only 1 phase + ground + neutral

4 years ago

It’s 100-240V, so you connect your 110V phase & neutral Input, and you have 4 controlled 110V output.

Ygor Almeida
4 years ago

Huum but how to control… I will cut 110v line for a 220v device. The device will still have a hot line of 110v connected

4 years ago

To get 110V you would wire Line1, neutral and ground. To get 220V you would most likely change this to Line1, Line2 and ground, where Line1 and Line2 are your 2 phases. Before you do anything else you should ask Sonoff a direct question to make sure as their public website is lacking in detail. One rather key thing from the photos they publish is that only the ‘live’ power rail is controlled by relays, which is not a problem for a single-phase configuration, which only has a single power rail. In a 2 phase installation, it would leave all… Read more »

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