Updated September 2026
Data from Amazon and official Shelly site.
2026 verdict
The Shelly 2PM Gen3 gets the nod for shutters and dual circuits, as the better rated relay with two channels and full overload protection.
It meters each channel, drives motors in interlock mode for roller shutters, blinds and garage doors, and cuts power on overheating, overvoltage, overcurrent and overpower. The Shelly 1 Gen4 counters with radios: Zigbee through a hub with Zigbee routing on top of Wi-Fi, Bluetooth and Matter, plus documented dry and wet contact modes and a 3-year warranty. Both are rated 16A, need a neutral, share the 37 x 42 x 16 mm body and work with Alexa, Google Home, Apple Home, SmartThings and Home Assistant. Choose the Shelly 2PM Gen3 for covers or two circuits with metering, and the Shelly 1 Gen4 for a single circuit in a Zigbee home or a dry contact job.
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| Feature | Shelly 1 Gen4 | Shelly 2PM Gen3 | Winner |
|---|---|---|---|
| Rating | 4.4 | 4.7 | Shelly 2PM Gen3 |
| Safety | Overheating protection | Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection | Shelly 2PM Gen3 |
| Connectivity | Bluetooth, Zigbee | Bluetooth | Shelly 1 Gen4 |
| Relay Channels | 1 | 2 | Shelly 2PM Gen3 |
| Zibgee Router | YES | NO | Shelly 1 Gen4 |
| Price | $24.99 | $24.99 | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
What the differences mean
Channels and covers
The Shelly 2PM Gen3 has two channels and an interlock mode for motors that run both ways, so one module handles a shutter or garage door. The Shelly 1 Gen4 switches one circuit.
Energy monitoring
The Shelly 2PM Gen3 measures consumption on each channel. The Shelly 1 Gen4 spec sheet does not document metering, so the 2PM is the one that confirms it.
Zigbee
The Shelly 1 Gen4 can join Zigbee through a hub and routes for battery sensors. The Shelly 2PM Gen3 has no Zigbee radio.
Protections
The Shelly 2PM Gen3 lists overheating, overvoltage, overcurrent and overpower protection. The Shelly 1 Gen4 lists overheating protection only.
Which one to buy if
- you are motorizing shutters, blinds or a garage door
The Shelly 2PM Gen3's interlock mode drives both motor directions from one module.
- you want consumption readings
The Shelly 2PM Gen3 meters each channel; the Shelly 1 Gen4 does not document metering.
- you run a Zigbee network
The Shelly 1 Gen4 joins through a Zigbee hub and routes for the mesh.
- you need a dry contact for a garage door opener
The Shelly 1 Gen4 documents dry contact mode, which owners use for momentary triggers.
- + Connectivity: Bluetooth, Zigbee
- + Zibgee Router: YES
- - Rating: 4.4 vs 4.7
- - Safety: Overheating protection vs Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
Winner
- + Rating: 4.7
- + Safety: Overheating protection, Overvoltage protection, Overcurrent protection, Overpower protection
- + Relay Channels: 2
- - Connectivity: Bluetooth vs Bluetooth, Zigbee
- - Zibgee Router: NO vs YES
What owners say
Owners of both Shelly relays praise local control and dependable Home Assistant integration. Shelly 2PM Gen3 owners run roller shutters, blinds and garage doors, praise a Wi-Fi link that holds deep in the wall box and per-channel metering, and a minority report a frustrating first pairing, trouble adding it to Alexa and a slightly thicker body than before. Shelly 1 Gen4 owners use it for single-circuit jobs like momentary garage door triggers, pool heater relays and detached mode for scene control, with schedules that survive outages; they warn that Zigbee pairing on hubs like Hubitat is fiddly and underdocumented and that it is a tight fit in a crowded box.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Shelly 1 Gen4
- Shelly 2PM Gen3
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Frequently Asked Questions
Which is better: Shelly 1 Gen4 or Shelly 2PM Gen3?
The Shelly 2PM Gen3 for most buyers, with two metered channels, cover control and full protection. The Shelly 1 Gen4 is the better pick for a single circuit on Zigbee or a dry contact trigger.
Is the Shelly 1 Gen4 a Gen4 version of the Shelly 2PM Gen3?
No. The Shelly 1 Gen4 is a single-channel relay from the Gen4 line, adding Zigbee, while the Shelly 2PM Gen3 is a two-channel metered relay. They do different jobs rather than being two generations of one product.
Can the Shelly 1 Gen4 control a roller shutter like the Shelly 2PM Gen3?
Not on its own: a shutter motor needs separate up and down circuits with interlock, which the two-channel Shelly 2PM Gen3 provides and the single-channel Shelly 1 Gen4 does not.
Do the Shelly 1 Gen4 and the Shelly 2PM Gen3 work with Home Assistant and Apple Home?
Yes, both work with Home Assistant, Apple Home through Matter, Alexa, Google Home and SmartThings.
Who should buy the Shelly 1 Gen4?
DIYers switching a single circuit who want Zigbee or dry contacts, for jobs like garage door triggers, pumps and scene control.
Who should buy the Shelly 2PM Gen3?
Anyone automating shutters, blinds, garage doors or two lights who wants per-channel metering and full overload protection.
Full comparison table
Compare all 47 Relays side by side
You are looking at two of them. The full table lines up all Relays in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
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