SONOFF SPM-Main - Smart stackable power meter control module, White

The SONOFF SPM-Main Smart Stackable Power Meter Control Module is a smart power-monitoring controller for tracking electrical consumption and managing connected equipment. It connects through 2.4 GHz Wi-Fi or Ethernet and supports remote operation via the eWeLink mobile app. With compatible SONOFF SPM modules, it can monitor voltage, current, and power across up to 128 channels. Intelligent on/off control provides switching alongside the monitoring functions. The module operates from a 100–240 V AC supply at 50/60 Hz. This input rating describes its power supply, rather than a stated load capacity.

The white PC V0 housing is intended for indoor use. Installation is on a DIN rail, so the mounting arrangement needs to suit that format. The module serves as the central unit in the SONOFF SPM energy-monitoring system and is intended for use with compatible SPM modules. An RS-485 interface is also provided. There is no built-in display, so readings are not shown on the module itself.

Key Features:

• Wi-Fi 802.11 b/g/n: supports connection using these network standards.
• MicroSD card support: allows energy data to be recorded for longer-term analysis.
• Overload protection: helps protect connected equipment from overload conditions.
• Stackable modular design: forms part of a system that can be expanded with compatible SPM modules.
• No built-in display: readings must be accessed through the connected system rather than a local screen.