Currently unavailable on Amazon USA
Updated October 2026
Data from Amazon and official Shelly site.
2026 verdict
Want to see what a circuit draws? Then the Shelly 1PM Gen4 is the better smart relay here, with energy monitoring and a 16A rating the smaller module lacks.
It also adds overvoltage, overcurrent and overpower protection on top of the overheating cutoff both share, and a Zigbee radio that routes for the mesh, where the Shelly 1 Mini Gen3 is Wi-Fi only with Bluetooth used for pairing. The Shelly 1 Mini Gen3 is the lower priced of the two and much smaller, at 29 x 35 mm against 37 x 42 mm, which is why it disappears into boxes the full-size module will not fit. Both switch AC and low-voltage DC loads, both offer dry and wet contact modes, both need a neutral and both work with Alexa, Google Home, Apple HomeKit, SmartThings, Home Assistant and Matter. Choose the Shelly 1PM Gen4 for metering, heavier loads or Zigbee, and the Shelly 1 Mini Gen3 for a light or a garage door trigger in a cramped box.
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Winner
$28.99
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| Feature | Shelly 1 Mini Gen3 | Shelly 1PM Gen4 | Winner |
|---|---|---|---|
| Rating | 4.5 | 4.6 | Shelly 1PM Gen4 |
| Safety | Overheating protection | Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection | Shelly 1PM Gen4 |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi, Bluetooth, Zigbee | Shelly 1PM Gen4 |
| Energy Monitoring | NO | YES | Shelly 1PM Gen4 |
| Zigbee Router | NO | YES | Shelly 1PM Gen4 |
| Warranty | 3 years | 3 years | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| Relay Channels | 1 | 1 | Tie |
| Dry Contact Mode | YES | YES | Tie |
| Wet Contact Mode | YES | YES | Tie |
What the differences mean
Energy monitoring
The Shelly 1PM Gen4 reports power and consumption, so you can see how often a water heater runs or build automations on real draw. The Shelly 1 Mini Gen3 only switches and reports nothing about the load.
Load rating
16A resistive on the Shelly 1PM Gen4 against 8A and 2000W on the Shelly 1 Mini Gen3. For lights and triggers either is fine; for a heater or a large appliance, the Gen4 has the margin. On DC the Gen4 also goes further, 10A against 5A.
Radios
The Shelly 1PM Gen4 carries Wi-Fi, Bluetooth and Zigbee, and in Zigbee mode it routes for the mesh. The Shelly 1 Mini Gen3 is Wi-Fi only, with Bluetooth used for pairing. Both reach Apple Home through Matter.
Protection
The Shelly 1PM Gen4 cuts out on overheating, overvoltage, overcurrent and overpower. The Shelly 1 Mini Gen3 has overheating protection only.
Size
The Shelly 1 Mini Gen3 measures 29 x 35 x 16 mm and weighs 19g; the Shelly 1PM Gen4 is 37 x 42 x 16 mm and 27g. Behind a light fixture or in a switch box already full of wires, that difference decides whether it fits.
Which one to buy if
- you want to track what an appliance consumes
Only the Shelly 1PM Gen4 has energy monitoring.
- the switch box is already crowded
The Shelly 1 Mini Gen3 is the smaller module by a clear margin, 29 x 35 mm against 37 x 42 mm.
- you run a Zigbee network
The Shelly 1PM Gen4 can join Zigbee through a hub and routes for the mesh; the Shelly 1 Mini Gen3 has no Zigbee radio.
- you just need a garage door or sprinkler trigger on a budget
The Shelly 1 Mini Gen3 has the same dry contact mode and platform support for less money, and metering adds nothing to a trigger.
Currently unavailable on Amazon USA
- - Rating: 4.5 vs 4.6
- - Safety: Overheating protection vs Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
Winner
$28.99
- + Rating: 4.6
- + Safety: Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
What owners say
Owners of both Shelly relays land on the same frustration first: the wiring diagram. Shelly 1 Mini Gen3 owners explain that the I and O terminals are the relay contacts rather than a power output, and Shelly 1PM Gen4 owners call its schematic unconventional, so both groups end up following an online guide before it works as advertised. Both praise instant local control and Home Assistant integration. Shelly 1 Mini Gen3 owners then celebrate the size and the value, listing garage doors, sprinklers, gas fireplaces and generators they automated with its dry contacts, and many run it without the app through its own web interface. Shelly 1PM Gen4 owners talk about watching real consumption on water heaters, furnaces and boilers, and they note that switching its radio into Zigbee mode takes firm button presses.
Frequently Asked Questions
Which is better overall: Shelly 1 Mini Gen3 or Shelly 1PM Gen4?
The Shelly 1PM Gen4. It adds energy monitoring, a 16A rating, full overvoltage, overcurrent and overpower protection and a Zigbee radio. The Shelly 1 Mini Gen3 is the cheaper and smaller choice when a relay only has to switch a light or trigger a door.
What changes between the Shelly 1 Mini Gen3 and the Shelly 1PM Gen4?
Three things: the Shelly 1PM Gen4 meters energy, is rated for 16A instead of 8A, and adds Zigbee alongside Wi-Fi and Bluetooth. It is also a full-size module, while the Shelly 1 Mini Gen3 is the compact one. Both support Matter and Apple HomeKit, dry and wet contacts, and need a neutral.
Is the Shelly 1 Mini Gen3 a power metering relay?
No. The Shelly 1 Mini Gen3 has no energy monitoring; it switches only. The PM in Shelly 1PM Gen4 stands for power metering, and that model reports power and consumption.
Do the Shelly 1 Mini Gen3 and the Shelly 1PM Gen4 work with Apple Home?
Yes, both do, through Matter, and both also work with Alexa, Google Home, SmartThings and Home Assistant.
Who should buy the Shelly 1 Mini Gen3?
DIYers who want the smallest, cheapest way to make a light, garage door, sprinkler or fireplace smart over Wi-Fi, in a box too tight for a full-size relay, and who do not need energy data.
Who should buy the Shelly 1PM Gen4?
Anyone who wants to see and automate on real consumption, switch heavier loads up to 16A, or add the relay to a Zigbee network, with full electrical protection built in.
Full comparison table
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