What the Shelly 1 Gen4 does
The Shelly 1 Gen4 is a 16 A smart relay that fits in the wall box behind an existing switch and adds app, voice and schedule control to one circuit.
Good for:
- Lighting circuits and single appliances
- Heaters, pumps and fans within its rating
- Dry-contact control of low-voltage equipment
Key facts
- Switching: 16 A/240 V~; 10 A/30 V⎓
- Power supply: 110-240 V~; 24-48 V⎓; 12 V⎓
- Neutral wire: Needed
- Size: 37x42x16 mm / 1.46x1.65x0.63 inch
Works with
Runs from the Shelly Smart Control app and works with Amazon Alexa, Google Home and Home Assistant, with no hub needed. Shelly Gen4 devices also support Matter, which works with Apple Home. Connectivity: Wi-Fi, Bluetooth, Zigbee, Matter.
Pairs well with
Also consider
Browse Relays & dimmers, all Shelly and what Shelly is.
Guides: Shelly Mini vs Pro vs BLU vs Wave: which to buy in the UK and Does Shelly work with Home Assistant in the UK?
Questions
Does the Shelly 1 Gen4 need a neutral wire?
Yes. It needs a neutral wire where it is fitted.
Do I need a hub for the Shelly 1 Gen4?
No. It connects to your home Wi-Fi directly.
Should an electrician fit it?
We recommend a qualified electrician for anything connected to mains wiring. The manual is linked on this page.
Will the Shelly 1 Gen4 fit in a UK back box?
The body measures 37 x 42 x 16 mm. Whether it fits depends on the box depth and the cables already in it.
What's the maximum load?
It switches up to 16 A at 240 V.