⚡ SONOFF 4CH R3 — 4-Channel WiFi Smart Switch · DIN Rail · 10A per Channel
The SONOFF 4CH R3 is a 4-channel WiFi smart switch that lets you independently control up to four devices from one compact module. Switch lights in four rooms, control a pool pump + garden lights + porch light + security floodlight — all from the eWeLink app or your voice assistant. Three working modes (self-locking, interlock, inching) make it versatile enough for everything from basic switching to gate/garage control. Mounts on a standard 35mm DIN rail inside your DB board for a clean, professional installation.
⚡ Key Features
- 4 Independent Channels — control four separate loads (lights, pumps, appliances) on or off independently from one module
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3 Working Modes (set in eWeLink app):
• Self-Locking — standard on/off; each channel operates independently
• Interlock — turning on one channel automatically turns off the other three; useful for mutually exclusive loads (e.g., HVAC modes, motor direction)
• Inching — pulse trigger; channel turns on then auto-off after 0.5–3,600 seconds; perfect for gate/garage momentary triggers - 10A per Channel / 16A Total — handles up to 2,200W per channel at 230V; 3,500W total across all four channels
- AC Input Only — 100–240V AC 50/60Hz (the standard 4CH R3 does NOT support DC input — see the 4CH PRO R3 for DC support)
- DIN Rail Mounting — clips onto standard 35mm DIN rail inside your distribution board; compact form factor (145 × 90 × 34 mm)
- WiFi Connected · No Hub Required — connects directly to your 2.4GHz WiFi network; control from anywhere via the eWeLink app
- eWeLink App Control — schedules, countdown timers, scenes, device sharing, power-on state (ON/OFF/KEEP), LAN mode for local control without internet
- Voice Control — Amazon Alexa, Google Assistant, Siri Shortcuts
- Physical Buttons — four on-device buttons for manual control without app or WiFi
- Home Assistant Compatible — via eWeLink LAN integration or custom firmware (Tasmota/ESPHome flashable)
🔀 4CH R3 vs 4CH PRO R3 — Which One?
The 4CH R3 (this product) is the standard version — WiFi only, AC input only. The 4CH PRO R3 adds 433MHz RF remote control, DC input (9–24V), and dry contact (NO/NC) outputs — making it the better choice for gate motors, garage doors, irrigation solenoids, and any application requiring voltage-free switching or RF backup. If you're switching mains-powered lights and appliances, the 4CH R3 is all you need.
🏠 Popular Use Cases in South Africa
Multi-Zone Lighting
Control four separate lighting circuits from one module in your DB board. Lounge, kitchen, patio, and bedroom — all independently switchable from your phone, voice, or on a schedule.
Pool Pump + Garden
Channel 1: pool pump on a daily schedule. Channel 2: garden lights at sunset. Channel 3: security floodlights. Channel 4: water feature. One module, four automations.
Inching / Pulse Trigger
In inching mode, each channel sends a momentary pulse (0.5–3,600s). Use it to trigger gate motors, garage door openers, electric locks, or irrigation solenoid valves.
Load Shedding Prep
Set power-on state to "OFF" for non-essential loads. When power returns after load shedding, only essential circuits come back on — protecting appliances from power surges.
The standard 4CH R3 accepts 100–240V AC only. It does NOT support DC input. If you need to power the module from 9–24V DC (e.g., for gate motor or alarm system integration), use the 4CH PRO R3 instead.
📋 Technical Specifications
| Model | 4CH R3 (4CHR3) |
| Input Voltage | 100–240V AC 50/60Hz |
| DC Input | ❌ Not supported (see 4CH PRO R3) |
| Max Load per Channel | 10A / 2,200W (at 230V) |
| Max Total Load | 16A / 3,500W |
| Number of Channels | 4 |
| Working Modes | Self-Locking / Interlock / Inching (0.5–3,600s) |
| Relay Type | Powered output (L-in → L-out per channel) |
| RF Control | ❌ Not supported (see 4CH PRO R3) |
| Dry Contact | ❌ Not supported (see 4CH PRO R3) |
| WiFi | IEEE 802.11 b/g/n 2.4GHz |
| Chipset | ESP8285 |
| Mounting | 35mm DIN rail |
| Dimensions | 145 × 90 × 34 mm |
| Material | PC V0 (flame retardant) |
| Operating Temp | -10°C to 40°C |
| Operating Humidity | 5–95% RH (non-condensing) |
| App | eWeLink (iOS / Android) |
| Voice Control | Alexa, Google Assistant, Siri Shortcuts |
| LAN Control | Yes (eWeLink LAN mode) |
| Power-On State | ON / OFF / KEEP (configurable in app) |
| Certifications | CE, FCC, RoHS |
🔀 4CH R3 vs 4CH PRO R3 Comparison
| Feature | 4CH R3 | 4CH PRO R3 |
|---|---|---|
| WiFi Control | ✅ Yes | ✅ Yes |
| 433MHz RF Remote | ❌ No | ✅ Yes (up to 4 remotes) |
| AC Input | ✅ 100–240V AC | ✅ 90–250V AC |
| DC Input | ❌ No | ✅ 9–24V DC |
| Dry Contact (NO/NC) | ❌ No | ✅ Yes |
| Working Modes | Self-Locking / Interlock / Inching | Self-Locking / Interlock / Inching |
| Max Load per Channel | 10A / 2,200W | 10A / 2,200W |
| Max Total Load | 16A / 3,500W | 40A / 8,800W |
| DIN Rail | ✅ Yes | ✅ Yes |
| Dimensions | 145 × 90 × 34 mm | 145 × 90 × 40 mm |
| Best For | Mains lights & appliances | Gates, garages, irrigation, dry contact |
| Price | R499 | R769 |
❓ Frequently Asked Questions
Can I use it for gate or garage control?
What's the difference between 4CH R3 and 4CH PRO R3?
Does it fit in a standard SA DB board?
Can I control each channel separately?
What happens during load shedding?
Does it work with Home Assistant?
Does it support 433MHz RF remotes?
🤝 Need Help? We're Here for You!
Visit Us
8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709
4 Channels. 1 Module. Total Control.
SONOFF 4CH R3 — WiFi Smart Switch · DIN Rail · R499