The SPM-4RELAY is the relay unit that needs the SPM-MAIN main unit to work.
The SPM devices are great stackable power measurement devices for especially usage in bigger building like malls or at offices.
- Power measurement (current, power, voltage) and switch to easily build in a fuse box
- DIN-rail compatible
- Do not use this device as safety fuse!
- Stackable up to 32 SPM-4RELAY units of each 4 relays (so 128 channels in total)
- Requires at least the SPM-MAIN main unit
- Each channel of the SPM-4Relay unit supports a maximum of 20A
- RS-485 communication between SPM-MAIN main unit and SPM-4RELAY units
- Protection types:
- Overload
- Supported features:
- Schedule
- Timer
- Loop timer
- Find me (pressing Find Me button on eWeLink app will blink indicator on corresponding SPM-4RELAY unit)
- Power consumption history records
- Supported third parties:
- Unknown
NotEnoughTech has reviewed the Sonoff SPM: https://notenoughtech.com/home-automation/sonoff-spm/
