Description
The Shelly 1 Gen4 is the 2026 flagship model of Shelly’s standard-sized smart relay. While it keeps the same physical dimensions as the previous generations (37 x 42 x 16 mm), it features a massive internal overhaul that makes it a “universal” device for almost any smart home ecosystem.
The biggest shift in Gen4 is Multiprotocol Connectivity: it is no longer just a Wi-Fi device; it now natively supports Zigbee and Matter out of the box.
Key Features & Upgrades
- Multiprotocol Support: You can choose to use it via Wi-Fi 6, Zigbee 3.0, or Matter (over Wi-Fi). It can also act as a Zigbee Range Extender and a Bluetooth Gateway for Shelly BLU sensors.
- Dry Contacts (Potential-free): Like the classic Shelly 1, the Gen4 version features an isolated relay. This allows you to switch a different voltage than the one powering the device (e.g., power it with 230V AC but use it to trigger a 12V garage door).
- High Load Capacity: It is rated for up to 16A (240V AC) or 10A (30V DC).
- New Processor: Powered by the ESP-Shelly-C68F chip with 8MB of flash memory, providing significantly faster execution of scripts and local actions compared to Gen3.
- Flexible Powering: It can be powered by 110-240V AC, 24-48V DC, or stabilized 12V DC.
Technical Specifications
| Feature | Shelly 1 Gen4 |
| Connectivity | Wi-Fi 6, Zigbee 3.0, Matter, Bluetooth 5.0 |
| Max Switching | 16A (AC) / 10A (DC) |
| Power Measurement | No (You need the 1PM Gen4 for this) |
| Scripting | Yes (mjS – JavaScript) |
| Safety | Internal temperature sensor (Overheat protection) |
| Terminals | Improved screw terminals (Grey color) |
Shelly 1 Gen4 vs. Shelly 1PM Gen4
It is common to mix these up, but they serve different purposes:
- Shelly 1 Gen4 (Blue): Has Dry Contacts. Use this for garage doors, gates, or switching different phases. It cannot measure power.
- Shelly 1PM Gen4 (Red): Has Power Monitoring. It does not have dry contacts (the output voltage is always the same as the input). Use this for appliances where you want to see energy usage.
Why choose Gen4 over Gen3?
If you are starting a smart home in 2026, Gen4 is the “future-proof” choice.
- Matter Certification: It connects directly to Apple Home or Google Home without needing a specific Shelly hub.
- Zigbee Integration: If you use Home Assistant with a Zigbee dongle, the Shelly 1 Gen4 can join that mesh network directly, improving your network’s range.
- Speed: The Gen4 is noticeably snappier when triggering scenes or responding to sensor inputs.
Note: Whilst the Shelly configuration is mostly DIY, any electrical work must be done by a registered electrical contractor and we recommend Straton Electrical.
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