Shelly Plug PM Gen3 Review: A Metering-Only Plug for Appliances You Must Not Switch Off
The Shelly Plug PM Gen3 is not a switch. It is a plug-in power meter with a 16 A, 3680 W pass-through that reports voltage, current, power and energy, and never interrupts the appliance behind it. That makes it the wrong pick for anyone who wants remote on/off control, and the right one for always-on equipment such as a fridge, a freezer, a server rack or a PV setup where a meter is useful and a relay is a liability. It brings Wi-Fi, Bluetooth, a local web interface, MQTT and scripting, and it reaches Alexa, Google Home, SmartThings and Home Assistant, but it has no Matter, no Zigbee and no HomeKit path.
- Always-on appliances
- High-load monitoring
- Home Assistant and local-API users
- Energy-usage tracking
Pros
- 16 A and 3680 W pass-through rating covers high-draw appliances
- Real voltage, current, power and energy metering with a stated 95% accuracy
- Never interrupts the load, which suits fridges, servers and PV gear
- Wi-Fi and Bluetooth with a BLE gateway and Wi-Fi range extender mode
- Local web interface, MQTT, open API and scripting with 20 webhooks
- Works with Alexa, Google Home, SmartThings and Home Assistant
- LED ring shows consumption at a glance and supports night mode
- Three-year warranty on Shelly Gen3 hardware
Cons
- No relay, so it cannot turn the appliance on or off at all
- Not a substitute for a switching smart plug despite the plug form factor
- Type F Schuko only, so it does not fit UK or North American outlets
- 2.4 GHz Wi-Fi only, with no 5 GHz band
- No Zigbee, Z-Wave, Thread, Matter or HomeKit support
- Indoor use only, with no ingress protection rating
- No USB charging output
Who is the Shelly Plug PM Gen3 for?
This plug is for the outlet where you want to measure, not control. Because there is no relay inside, it suits appliances that must never lose power: a refrigerator, a freezer, a network cabinet, a home server or a PV inverter. It also fits anyone who wants to know what a heavy always-on load actually draws, with an AC voltmeter, an AC ammeter and power and energy meters built into the device and an internal temperature sensor alongside them. Buyers who prefer local control get a web interface, MQTT, an open API and scripting instead of a cloud-only meter.
What the Shelly Plug PM Gen3 offers
The headline is measurement capacity paired with a genuine 16 A, 3680 W pass-through rating, which puts space heaters, kettles and other high-draw appliances inside its envelope even though it will not switch them. The meter reports voltage, current, power and cumulative energy, with a stated metering accuracy of 95%, and the LED ring turns green, yellow or red with consumption so the reading is visible without opening an app. On the network side it is Wi-Fi 802.11 b/g/n and Bluetooth 4.2, and the Bluetooth radio doubles as a BLE gateway while the Wi-Fi side can act as a range extender. Firmware capabilities include 20 webhooks with five URLs each, MQTT, scripting and virtual components, all reachable over the local network, and the device is backed by a three-year warranty.
What to know before you buy
The single most important thing is the absence of a relay: this plug cannot turn the appliance on or off, from the app, a schedule, a voice assistant or the physical button, so it is not a smart switch and cannot save energy by shutting anything down. The button only reports status and reboots or factory-resets the device. The socket standard is the second filter: the input is a CEE 7/7 plug and the output is a CEE 7/3 Type F Schuko socket, so it belongs in continental Europe and will not fit UK or North American wiring. The radio is 2.4 GHz Wi-Fi and Bluetooth only, with no Zigbee, Z-Wave or Thread, and there is no Matter or HomeKit path. It is an indoor device with no ingress protection rating, rated for -20 to 40 degrees Celsius and 30 to 70 percent relative humidity, and the 3680 W figure is a resistive rating, not a continuous-load recommendation.
Is the Shelly Plug PM Gen3 worth it?
As a meter, it is one of the cheapest ways to put real voltage, current, power and energy measurement behind a heavy appliance, and it does it locally, without a hub and without interrupting the load. As a smart plug it is not a substitute for a switching model: if your goal is to turn something off remotely, you need a relay-equipped plug instead, and the same brand sells those. The value call depends entirely on which of the two jobs you have. For always-on equipment where the number matters more than the switch, it earns its place; for routine control, it is the wrong device.
Frequently asked questions
Can the Shelly Plug PM Gen3 turn an appliance on or off?
No. It has no relay, so it cannot switch the connected appliance. It measures consumption and sends overload and consumption alerts, but any on/off control has to come from a switching plug instead.
Does the Shelly Plug PM Gen3 need a hub?
No. It joins a 2.4 GHz Wi-Fi network directly and is set up over Bluetooth, and it can run on the local network through its embedded web interface with the Shelly cloud app optional.
How much power can it measure?
It is rated for a 16 A, 3680 W resistive load, and it measures voltage, current, power and energy on that outlet. That rating is for resistive loads, so motors, transformers and other inductive or capacitive loads sit lower.
Does it work with Home Assistant, Alexa and Google Home?
Yes. It works with Amazon Alexa, Google Home, Samsung SmartThings and Home Assistant, the last through the official Shelly integration, and it also exposes a local web interface, MQTT and an open API.
Does the Shelly Plug PM Gen3 support Matter or HomeKit?
No. This model has no Matter support and therefore no Matter-based path into Apple Home, and it has no native HomeKit support either.
What kind of socket does the Shelly Plug PM Gen3 fit?
It has a CEE 7/7 plug and a CEE 7/3 Type F Schuko output socket, so it fits Schuko and Type E outlets used across continental Europe. It measures 44 x 44 x 70 mm and weighs 48 g.
