SONOFF BASICR4 Wi-Fi Smart Relay Module
SONOFF BASICR4 Wi-Fi Smart Relay Module
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CE, FCC, ETL, ISED, and RoHS certified, it incorporates the ESP32-C3FN4 chip for stable and responsive 2.4 GHz Wi-Fi connectivity, with a maximum load of 2400W at 240V AC. Compact at 88 × 39 × 24 mm, the SONOFF BASICR4 Wi-Fi smart relay module installs behind an existing switch, under a ceiling light, or in a junction box to intelligently connect any load up to 10A without replacing existing electrical wiring.
Magic Switch Mode, eWeLink-Remote Gateway, and Bidirectional Local Control
The major innovation of this model lies in its Magic Switch Mode: after a slight wiring modification to your mechanical switch, the relay remains permanently powered. This definitively solves the problem of a physical switch cutting off smart home access to your smart bulbs! In addition, the BASICR4 integrates a local eWeLink-Remote gateway: it allows you to pair wireless remotes like the Sonoff R5 or the S-Mate2 module to create two-way or additional control points with very low latency, without relying on your internet connection.
Real-time Thermal Protection and Power-on State Memory for the SONOFF BASICR4 Wi-Fi Smart Relay Module
The internal temperature sensor continuously monitors the heat generated by the relay and automatically cuts off power in case of overheating, before any risk of deformation, melting, or exposure of live wires. The power-on state memory configures the behavior of the SONOFF BASICR4 Wi-Fi smart relay module after a power outage: return to on, off, or the last recorded state, with a configurable recovery delay from 0.5 seconds to 59 minutes 59 seconds. The loop timer function automates recurring on/off cycles at custom intervals.
Smart Scenes, Group Control, and Multi-platform Compatibility
Group control allows multiple BASICR4 devices to be synchronized from the eWeLink app with a single gesture, ideal for simultaneously turning off all lights in a home. Compatible with Alexa, Google Home, SmartThings, IFTTT, and Alice, the BASICR4 connects to major voice assistants and common automation platforms. LAN mode maintains local control without the cloud when the smartphone and module are on the same network, and an offline alert is sent five minutes after connection loss to maintain control of the installation at all times.
Local Control, LAN Mode, and Home Assistant
The BASICR4 integrates a LAN mode allowing local control when the smartphone and module are connected to the same network. It is also compatible with Home Assistant thanks to the SonoffLAN integration, offering local operation without relying on the cloud. For experienced users, its architecture based on an ESP32-C3 chip also makes it an excellent candidate for custom projects under ESPHome.
FAQ
Does Magic Switch mode require wiring modification?
Yes, Magic Switch mode requires adding a jumper wire between the L1 and L2 terminals of the wall switch according to the manual's instructions. This simple modification allows the BASICR4 to remain powered and controllable from the app even when the physical switch is in the off position.
Can the BASICR4 act as a gateway for multiple R5 remotes simultaneously?
Yes, the BASICR4 integrates an eWeLink-Remote gateway that allows pairing multiple sub-devices like the SwitchMan R5 or S-Mate2 for bidirectional or multi-directional control from multiple control points without additional wiring between devices.
What happens after a power outage?
The power-on state is configurable from the eWeLink app in three modes: return to on, return to off, or return to the last recorded state before the outage. A customizable recovery delay from 0.5 seconds to 59 minutes 59 seconds can also be set to avoid simultaneous overloads when power returns.
Does the BASICR4 require a neutral wire?
Yes. The BASICR4 must be powered by a live and a neutral wire. Please ensure your installation has a neutral conductor before installation.
Can the Sonoff BASICR4 be used with voice assistants?
Yes, the module integrates natively with Amazon Alexa, Google Home, Samsung SmartThings, and IFTTT via the eWeLink app. You can also configure group control to turn off all your BASICR4 outlets and relays with a single voice command or click.
Technical Specifications
| Feature | Value |
| Brand / Model | SONOFF BASICR4 |
| Main Processor (MCU) | ESP32-C3FN4 |
| Wireless Technology | Wi-Fi IEEE 802.11b/g/n 2.4 GHz (Easy pairing via Bluetooth) |
| Power Input / Output | 100-240 V AC, 50/60 Hz |
