Shelly
Shelly PM Mini Gen3
- Native integration
- Local control
- Wi-Fi
- Bluetooth
Prices verified September 2026
See more smart plugs & energy picks on our Amazon storefront →Our verdict
A tiny 16A power meter that hides behind a socket, in a ceiling rose, or spliced into a consumer unit to monitor a whole circuit, not just one device. Unlike a plug-in energy monitor, which only sees whatever is plugged into it, this wires inline on the live conductor, so it can sit on a cooker circuit, an immersion heater, or a lighting ring and total everything downstream. It is not a CT-clamp meter — no clip-on sensor, just two screw terminals — so the circuit needs isolating to fit it. No relay, just measurement, fully local on the core Shelly integration and cheap enough to scatter around the house.
What can Home Assistant control on the Shelly PM Mini Gen3?
| Control | Type | What it does |
|---|---|---|
| Power / Voltage / Current / Frequency | Sensor | Live circuit readings — measurement only, no switching |
| Total energy | Sensor (kWh) | Cumulative reading — refreshes roughly once daily, not live |
It's measurement-only — power, voltage, current and frequency update live, but the total-energy sensor only refreshes once daily around 3am regardless of what power is doing in real time, a confirmed open HA Core bug rather than a setup issue. Since it can't switch anything itself, the practical pattern is "measure here, act elsewhere": feed its live power sensor into an automation that trips a separate smart relay on a different circuit once draw crosses a threshold, rather than expecting the module to self-protect.
Specs
| accuracy | Accuracy Class B per IEC 62053-21 (approx. ±1%) |
|---|---|
| max load | 16A single channel, 3840W max at 240V |
| plug type | n/a (in-wall wired module) |
| dimensions | 29 x 34 x 16mm, 13g |
| installation | Inline wired module (L/N screw terminals, no CT clamp) — behind a socket, switch, or in a ceiling rose/consumer unit; no relay switching |
| standby power | <1.2W |
| energy monitoring | true |
| operating temperature | -20°C to 40°C |
How does the Shelly PM Mini Gen3 compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Shelly PM Mini Gen3 (this product) | £14.99 | Wi-Fi, Bluetooth | Yes | Native |
| Aqara Power Plug H2 UK (RGB) | £32.99 | Zigbee, Thread, Matter, Bluetooth | Yes | Works with HA |
| Aqara Wall Outlet H2 UK | £67.99 | Matter, Thread, Zigbee | Yes | Native |
| Eve Energy (Matter) UK Smart Plug | £39.95 | Thread, Matter, Bluetooth | Yes | Works with HA |
Frequently asked questions
- Does the Shelly PM Mini Gen3 work with Home Assistant locally?
- Yes. The Shelly PM Mini Gen3 is controlled locally in Home Assistant through a built-in Home Assistant core integration (shelly), so it keeps working if your internet connection or the Shelly cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Shelly PM Mini Gen3 use, and do I need a hub?
- The Shelly PM Mini Gen3 uses Wi-Fi and Bluetooth. To pair it with Home Assistant you need no hub — it joins your Wi-Fi network directly; or a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy. Shelly's own hub is not required when you integrate through a built-in Home Assistant core integration (shelly).
- How much does the Shelly PM Mini Gen3 cost in the UK?
- The lowest price we have listed for the Shelly PM Mini Gen3 is £14.99 at Shelly Store UK. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.