i noticed this has ac and dc power inputs. can i operate 2 ac lights and 2 dc fans simultaneously

Important to note that the outputs have NOTHING to do with the power supplied to the unit on the 4CH Pro and 4CH Pro R2. Supplied power is for the electronics only. You will need additional power source(s) - in addition to the power for the electronics -for the devices you are controlling via the relays/switches.

What are the differences between 4ch, 4ch pro, 4ch r2 and 4ch r2 pro?

Just by looking at the pics and specs displayed it appears that the two 4CH units (WITHOUT PRO) use the same power source (90-220 AC) for the electronics AND the connected devices). Both the models with PRO use the supplied power ONLY for the electronics and you would supply power separately to the external devices controlled by the switches.

What is the amperage limit / ampacity of this unit?

This is 10 amp /loaf with a wifi. & 433 MHz

How do you change modes between interlocking, self locking and inching?

Hello that is done with the DIP switches. I don't have the manual in front of me but if you go to the webpage for the device you can get a PDF version. If I remember correctly it was better than the one on the box and clearly showed how to set them.

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Sonoff 4CH Pro R3 Wi-Fi Smart Switch 4-Channel Din Rail Mounting Home Automation,Self-Locking/Interlock Control Home Appliances, RF/APP/Voice/LAN Control, Works with Alexa

Sonoff 4CH Pro R3 Wi-Fi Smart Switch 4-Channel Din Rail Mounting Home Automation,Self-Locking/Interlock Control Home Appliances, RF/APP/Voice/LAN Control, Works with Alexa

Product ID: 402194015

Details

Connector type
Clamp
Contact type
Normally Open
Current rating
10 Amps
Operating voltage
120 Volts
Operation mode
automatic

⚡10A current rating

📶Wi-Fi + RF + Voice control

🔌4 independent channels

€ 117.34

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🏠 Power your smart home like a pro with 4 channels of effortless control!

ROBUST READY - DIN rail mount, IP54 rated, and supports up to 8800W with reliable copper contacts for professional-grade durability.
TRIPLE MODE MAGIC - Switch seamlessly between self-locking, interlock, and inching modes directly from the app.
QUAD CHANNEL MASTERY - Control 4 devices independently or in smart modes for ultimate home automation flexibility.
SMART SCHEDULING SHARING - Set up to 8 countdown timers that work offline and share device control with family or colleagues.
SEAMLESS MULTI PLATFORM CONTROL - Operate via Wi-Fi, RF remote, voice assistants like Alexa, or LAN for unmatched convenience.

The Sonoff 4CH Pro R3 is a professional-grade 4-channel Wi-Fi smart switch designed for DIN rail mounting. It supports independent control of four home appliances with three versatile working modes—self-locking, interlock, and inching—accessible via app, RF remote, voice commands, or LAN. Rated for 10A current and up to 8800W power, it features IP54 protection and robust copper contacts, making it ideal for seamless, reliable home automation integrated with Alexa, Google Home, and IFTTT.

Specifications

ASIN	B08BHWF8KD
Actuator Type	electronic
Best Sellers Rank	#4,543 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in Smart & Remote Controlled Plugs
Brand	SONOFF
Brand Name	SONOFF
Circuit Type	4-way
Color	Black
Compatible Devices	Home appliances, lights, Alexa, Google Home, IFTTT
Connectivity Protocol	Wi-Fi
Connector Type	Clamp
Connector type	Clamp
Contact Material	Copper
Contact Type	Normally Open
Contact type	Normally Open
Control Method	Remote, Voice
Control Type	full
Controller Type	App, RF Remote, Voice, LAN
Current Rating	10 Amps
Current rating	10 Amps
Customer Reviews	4.6 out of 5 stars 299 Reviews
Global Trade Identification Number	07898717250008
International Protection Rating	IP54
Item Dimensions	14.5 x 9 x 4 centimeters
Item Weight	0.1 Kilograms
Lower Temperature Rating	1 Degrees Celsius
Manufacturer	SONOFF
Material Type	Metal
Model	4CHPROR3
Mounting Type	DIN Rail Mount
Number of Items	1
Number of Positions	4
Operating Voltage	120 Volts
Operating voltage	120 Volts
Operation Mode	automatic
Operation mode	automatic
Part Number	4CHPROR3
Specification Met	CE, FCC
Switch Type	Electronic" Or "Smart
Terminal	Clamp
Unit Count	1 Count
Upper Temperature Rating	40 Degrees Celsius
Wattage	8800 watts

Reviews

D**U

As describe

Working good

7.02.2026

A**R

Good and reliable

18.03.2026

C**S

Ótimo produto

Recebido no prazo e funcionando corretamente.

24.11.2022

R**Z

Funciona genial para control de aire lavado

Me lo recomendó la IA para controlar mi aire lavado por wifi o Alexa y cumplió perfectamente. Lo que sí podría mejorar es el tamaño de los bornes para meter los cables

14.06.2026

I**D

Best for smart automation

Working great

8.10.2020

O**S

funcional

muito bom para automação da casa funciona perfeitamente

2.02.2022

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€ 117.34

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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