Sonoff SPM-4Relay 4-channel smart relay module (Need SPM-Main)

Sonoff SPM-4Relay 4-channel smart relay module (Need SPM-Main)

The SONOFF SPM-4Relay is the 4-channel relay and metering unit of the SONOFF Smart Stackable Power Meter. Each of its 4 isolated channels can switch a load of up to 20A and measures the current, voltage and power of that circuit.

It works together with the SPM-Main unit, which connects it to the eWeLink app.

4 isolated channels, 20A each: Each channel handles up to 20A, with a total of 80A per unit. You can put separate loads, such as different rooms or tenants, on separate channels.

Power metering per channel: The eWeLink app shows the current, voltage and power of each channel, so you can see where electricity is used and share costs fairly.

Overload protection: When overload protection is enabled, the channel cuts the power if the load goes above your limit, which helps protect the connected devices. An overload delay can be set to avoid false triggering.

Remote control and schedules: Switch each channel on or off remotely and set schedules from the app.

Stackable system: Up to 32 SPM-4Relay units can be connected to one SPM-Main over RS-485, giving up to 128 channels in one system.

Who it's for / Works with

Installers who need per-circuit metering and control, used together with the SONOFF SPM-Main main unit and the eWeLink app.

Good to know

The SPM-4Relay does not work alone: it must be connected to an SPM-Main main unit, which is sold separately.

Installation must be done by a qualified electrician.

Technical Specifications

📄 User manual: Download the official SONOFF SPM-Main / SPM-4Relay user manual (PDF)

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