Device overview

Shelly EM Mini Gen4 is a compact single-phase energy meter designed to fit behind wall switches, sockets, and other tight spaces where a full panel meter would be excessive. It is aimed at load-level monitoring rather than whole-home metering, so it works best when you want to understand the consumption of one appliance, one outlet group, or one small branch circuit.

Core features

  • Inline metering up to 16 A at 240 VAC
  • Wi-Fi, Zigbee, Bluetooth, and Matter connectivity
  • Local web interface plus MQTT, HTTP, WebSocket, RPC, and scripting support
  • Compact form factor for retrofit use behind existing wall devices
  • Meter-only design with no relay inside

Installation and measurement fit

This is an inline single-phase meter, not a CT-clamp system. It measures the connected load directly through its own wiring terminals, which makes it useful for smaller circuits and appliance-level tracking where there is enough enclosure space and the circuit stays within the 16 A measurement limit.

Shelly positions it for retrofit installation behind switches and sockets or in other space-constrained locations. Because it has no relay, it is better understood as a monitoring device than as a load-control module.

Connectivity and local access

Shelly EM Mini Gen4 supports local setup and local communication. The official source set documents an embedded web interface, MQTT, HTTP, WebSocket, RPC-style API access, scripting support, and multi-protocol wireless connectivity. For buyers who care about local dashboards or automation workflows, that makes it more flexible than app-only mini meters.

Home Assistant and automation fit

Shelly's official Home Assistant integration guidance says Shelly devices are auto-discovered, communicate locally, and do not require cloud access for normal Home Assistant use. That makes EM Mini Gen4 a strong fit for households that want energy-triggered automations, usage alerts, or appliance-level monitoring inside a broader Home Assistant setup.

Best-fit scenarios

  • Tracking one appliance or one small branch circuit
  • Retrofitting monitoring into tight wall-box or socket-adjacent spaces
  • Building local automation flows around device-level consumption
  • Adding compact sub-metering without moving to a DIN-rail panel meter

Watch-outs

  • It is single-phase only
  • It is not a whole-home or three-phase meter
  • It does not include a relay for switching loads
  • The official product lane describes appliance and connected-device monitoring, so it is not the right choice when you need formal solar import/export metering at the service or inverter interface