SONOFF SPM-Main Wi-Fi Ethernet Energy Controller

Sonoff SPM-Main Smart Switch

The Sonoff SPM-Main smart switch measures power consumption and supports both Ethernet and Wi-Fi connectivity. It can handle up to 128 channels – you can connect it to up to 32 SPM-4Relay switches (4 channels each), which are sold separately. Furthermore, overload protection helps prevent damage to your devices. The product is also very easy to install.

Many uses

The SPM-Main switch is suitable for a wide variety of applications. For example, you can check how much electricity your tenants are using each month, or you can learn about the energy consumption in a shopping center or office. The product is also useful in a server room or cryptocurrency mining facility – the overload protection function will help prevent damage to specific devices.

Reliable signal transmission

Enjoy device connectivity. SPM-Main communicates with the cloud via Ethernet or Wi-Fi. It also connects to SPM-4Relay switches via RS-485, ensuring stable transmission over long distances. Connection issues are a thing of the past!

Power consumption meter

Want to check energy consumption changes in every room in your office? Or perhaps you'd like to know how much electricity your tenants are using? With Sonoff, it's possible! The SPM-Main and SPM-4Relay switches allow for precise energy consumption measurement. All the information is available in the eWeLink app. This means you can check your power consumption without leaving home – just pick up your phone!

Overload Protection

Increase security in your server room and don't worry about damaging your devices. The switch offers overload protection. When activated, your equipment will automatically shut down when the current, voltage, or power reaches the value specified in the app. A load delay function is also available.

Supports up to 128 channels

One SPM-Main module can control up to 32 SPM-4Relay switches. Furthermore, each SPM-4Relay offers up to 4 independent channels with a maximum load of 20A each. This means the SPM-Main can handle up to 128 channels! This makes it ideal for use in an apartment building, for example, allowing you to monitor the energy consumption of tenants in rented apartments.

Additional amenities

Now you can save a history of energy consumption measurements from the last 180 days. The switch is equipped with an SD card slot (8-32 GB, SDHC). This allows you to conveniently export data and ensures that you won't lose any important information. Mounting the SPM-Main and SPM-4Relay switches is also easy. You can easily mount them on a guide rail. Note: SD card not included.

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