About Intelligent switch Sonoff SPM-4Relay White

SONOFF smart stackable power meter

This stackable power meter realizes intelligent management with overcharge protection, metadata monitoring and electricity statistics.

RS-485 communication enables "Smart Stackable"

The SPM-Main communicates with the cloud via Ethernet or WiFi, and communicates with the SPM-4Relays via RS-485, which enables stable, multiterminal long-distance data transmission.

energy measurement

Do you want to know the energy consumption variations of each bay? Do you want to carry out the unified management of the entire mall? By checking the eWeLink app on your mobile phone, you can monitor your electricity usage without leaving your home. Through the eWeLink app, you can get the power consumption through one touch.

overload protection

Once the overload protection is activated, you don't have to worry about electrical appliances burning out, helping to remove potential safety hazards. In addition, you can also set the overload delay on to avoid spurious triggering.

128 isolated channels and each up to 20A

An SPM-Main can be connected to 32SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help the tenant solve the electrical load sharing problem. Each channel can withstand a maximum current of 20A, not afraid of high power load.

Get over 180 days of energy usage data

Local SD card storage available. You can insert SD card into SPM-Main to download and check 180+ days of your energy usage history anytime of the day via HTTP API. No need to worry about losing important information.

Simple Installation

You can install SPM-Main and SPM-4Relays step by step following the user manual. With the guide rail, they can be installed in the right place easily to make your room look neat and tidy.