Sonoff 4CH R3 Smart Switch WiFi

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It’s a 4‑channel WiFi smart switch: Sonoff 4CH R3
Voltage: 100‑240 V AC sonoffafrica.co.za+1
Max load: 10 A (≈2200 W) per channel, total ≤ 16 A / 3500 W
WiFi: only 2.4 GHz
Three working modes: self‑locking, interlock, inching (set via eWeLink app)
Timer/scheduling support, share control with other users, scene automation
Power-on state memory: you can choose whether each channel comes on/off or keeps its last state after a power cut
Physical size: 145 × 90 × 34 mm
Operating temperature: –10 °C to +40 °C

Category: Home Automation Brand: Sonoff

Description

What is the Sonoff 4CH R3?

Key Features:

4 independent relay channels – control up to 4 devices or circuits separately.
Wi‑Fi connectivity – 2.4 GHz only (does not support 5 GHz).
Three operation modes via the eWeLink app:
- Self‑locking – normal on/off control.
- Interlock – only one channel can be on at a time.
- Inching – channel turns on briefly and then automatically off after a set time (0.5–3600 seconds).
Timer & schedule functions – automate devices at specific times.
Power-on state – decide whether channels turn on, off, or retain state after a power outage.
Share control – allow other eWeLink accounts to control the switch.
Security – WPA/WPA2 Wi-Fi encryption.
Voltage – 100–240V AC, works in many countries.
Max load – ~10A per channel (~2200W) and total ~16A / 3500W.
Temperature range – -10 °C to 40 °C.
Dimensions – 145 × 90 × 34 mm.

Pros & Cons

Pros:

Flexible 4-channel control.
Good for automation: schedules, timers, and scenes in eWeLink.
Different modes (inching, interlock) for varied devices.
Compact for a 4-relay module, easy to mount in a panel.

Cons / Risks:

Only 2.4 GHz Wi-Fi.
Must not overload channels with high-power devices.
Power-on behaviour can be tricky if not configured correctly.
Working with 230 V requires electrical knowledge.
App-dependent: integration with other smart-home systems may require workarounds.

Use Cases

Smart lighting for multiple rooms (up to 4 circuits).
Control pumps, motors, or other appliances individually.
Automate devices with timers and scenes via eWeLink.
Mount in an electrical panel if there’s enough space and proper wiring.

Safety & Maintenance

To keep your system safe and working correctly, please follow these basic safety and maintenance guidelines. These apply to most solar, battery, inverter and electrical components supplied by Rohen Services.

General Safety:
• Ensure all products are installed by a qualified technician
• Do not open, modify or tamper with equipment
• Protect components from water ingress, dust and extreme heat
• Always switch off the power before handling electrical connections
• Use the product only within the manufacturer’s recommended limits

Battery Safety (where applicable):
• Keep batteries in a well-ventilated, dry environment
• Avoid direct sunlight and extreme temperatures
• Do not short-circuit the terminals
• Ensure communication cables are secured and undamaged

Maintenance:
• Check cables, breakers and connectors periodically for wear
• Keep components clean and free of debris
• Test backup systems during low-risk periods (for example during the day)
• Report unusual noises, smells or error messages immediately

Support:
If you are unsure about the safe operation of your product, contact Rohen Services on 082 449 0277 or sales@rohen.co.za. Our team can assist with inspections, diagnostics and maintenance across the North West Province.

Installation & Delivery

Rohen Services provides delivery and installation support across the North West Province for all major solar and power products.

Delivery:
• Standard delivery time is 5–7 working days after payment clearance
• All items are inspected before dispatch
• Packaging is reinforced to protect components during transport
• Basic product documentation is included where applicable

Installation:
Installation is available for qualifying products such as batteries, inverters, panels, hybrid systems, security equipment and monitoring hardware. Work is carried out by trained technicians to ensure safety, warranty compliance and correct configuration.

A standard installation includes:
• Mounting or placement of the product
• Electrical and communication connections
• System testing and calibration
• A final handover with usage guidance

Service areas include Klerksdorp, Potchefstroom, Stilfontein, Hartbeesfontein, Orkney and surrounding regions.

Bookings:
To arrange delivery or installation, contact Rohen Services at 082 449 0277 or email sales@rohen.co.za.

Warranty & Support

Rohen Services supplies all products with the official manufacturer warranty. Warranty periods vary by brand and product type, but most major items such as batteries, inverters and charge controllers include a 5-year warranty, with some models offering optional extensions.

Covered:
• Manufacturing or material defects
• Internal component or BMS faults under normal use
• Performance issues confirmed through warranty testing

Not covered:
• Incorrect installation or wiring
• Lightning, surge or grid damage
• Water ingress, physical damage or tampering
• Use outside the manufacturer’s specifications

Important:
For exact warranty terms on your specific product, please confirm with Rohen Services before installation or use. Some items such as cables, fuses, brackets and smaller accessories may carry limited warranties.

Support:
For warranty queries or troubleshooting, contact Rohen Services on 082 449 0277 or sales@rohen.co.za. Our team manages testing, claims and replacements for customers across the North West Province.