Sonoff SPM 4Relay Smart 4-Channel Relay Module

【Connect up to 32 pieces of SPM-4Relays】One SPM-Main unit can be connected to 32 SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help you control your devices more conveniently.
【Meter your energy consumption】You can monitor your energy consumption via the eWeLink app on your mobile phone. Easily get information on current, voltage and power.
【Max. 20A/channel】Each channel can support a maximum current of 20A without fear of high load.
【Communication via RS-485】SPM-Main communicates with SPM-4Relays via RS-485, which enables multipoint and stable data transmission over long distances.
【Overload protection】When enabled, overload protection protects your devices from damage caused by overload.

SONOFF Smart Stackable Power Meter consists of

(1) main units with built-in Wi-Fi chip and support for eWeLink IoT cloud and eWeLink app, and

(2) one or more SONOFF Smart Stackable Power Meter 4-relay units.

THIS PRODUCT IS A SPM 4-RELAY UNIT.

The SPM MAIN unit is sold separately.

All units are mounted on the DIN rail of the electrical cabinet and offer Smart management and metering of energy consumption with a maximum capacity of 20A per channel, and overload protection for all channels. It is a high-performance professional tool for the smart homewhich allows you to manage homes, commercial and industrial buildings or even shopping centres, and monitor the energy consumption of occupants or tenants.

The SPM Master Unit communicates with the eWeLink cloud via Ethernet or Wi-Fi connection, and via RS-485 with the SPM-4relay modules, allowing multi-point and stable long-term data transmission. One Master Unit can manage up to 32 pieces of 4-relay units, supporting a total of 128 channels with management and power metering up to 20A per channel.

The device has an SD card slot into which you can insert an SDHC memory card (not attached) to store up to 180 days of consumption data and view the data via HTTP API. Data can also be exported.

Product features:

• Remote on/off - You can switch all channels on and off remotely, anytime, anywhere.
• Up to 32 4-channel relays can be added to the main unit, supporting up to 128 independent channels in total
• DIN rail mounting
• SD card support: Allows insertion of an 8GB-32GB SDHC card to store up to 180 days of consumption data
• Independent channel management
• Physical on/off buttons on a 4-relay unit
• Overload protection for all channels
• Mobile app - Free iOS and Android app: eWeLink, connecting to the eWeLink IoT Cloud
• Synchronisation of status - Check the actual relay status (on or off) via the mobile app
• Sharing control - Manage your device with your family