Shelly
Shelly 1L Gen3 (with Bypass)
- Native integration
- Local control
- Wi-Fi
- Matter
- Bluetooth
Prices verified October 2026
See more relays & dimmer modules picks on our Amazon storefront →Our verdict
Shelly's dedicated answer to the classic UK no-neutral lighting circuit: a live-only single relay, with the bypass capacitor built in so LED loads under 5W stay happy. Same fully-local Shelly integration as the rest of the range — no compromise on control quality just because your back box lacks a neutral. At £26.24 it's roughly double SONOFF's ZBMINIL2 (£13.99) — pay the premium if you want Wi-Fi's simpler pairing and Shelly's polished app/HA integration over Zigbee's better mesh scaling and lower per-device draw. At 37x42x16mm it's tight enough for most UK back boxes, but measure depth first if yours is already crowded with cabling.
What can Home Assistant control on the Shelly 1L Gen3 (with Bypass)?
| Control | Type | What it does |
|---|---|---|
| Switch | Switch | Single relay on/off for the load; no dimming. |
| Input 1 / Input 2 | Binary sensor / event | Two physical switch inputs, each independently configurable as push, toggle, or detached/edge mode; in detached mode they emit press events instead of directly driving the relay. |
| Signal strength | Sensor | Wi-Fi connection strength diagnostic. |
| Firmware update | Update | Surfaces available Shelly firmware releases, including the build needed to enable Matter. |
| Restart | Button | Reboots the device from HA without power-cycling the circuit. |
HA's shelly integration talks to the 1L Gen3 over Gen3 RPC/WebSocket, exposing one switch entity plus two independent input entities that can each be set to push, toggle, or detached/edge mode in the Shelly app — detached mode is what lets a two-gang stair switch fire HA automations without ever routing mains through the relay itself. There's no power or energy entity: because the 1L switches live-only with no neutral reference, the firmware doesn't compute wattage, so it won't populate the HA energy dashboard the way Shelly's PM-suffixed relays do. Matter ships as ready rather than active — the radio only turns on after a firmware update — and a good automation pairs one input in detached mode as a dedicated scene trigger, since the relay can't use power draw to distinguish a light physically on from a failed bulb the way a PM model could.
Specs
| channels | 1 |
|---|---|
| max load | 200W, bypass built in for loads over 5W |
| weight g | 24 |
| flush mount | true |
| dimensions mm | 37x42x16 |
| rated voltage | 220-240V~ 50Hz |
| standby power w | 1.2 |
| neutral required | false |
| operating temp c | -20 to 40 |
How does the Shelly 1L Gen3 (with Bypass) compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Shelly 1L Gen3 (with Bypass) (this product) | £26.24 | Wi-Fi, Bluetooth, Matter | Yes | Native |
| Aqara Dual Relay Module T2 | £29.74 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Single Switch Module T1 (No Neutral) | £26.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Candeo Zigbee Dimmer Module (C-ZB-DM204) | £39.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the Shelly 1L Gen3 (with Bypass) work with Home Assistant locally?
- Yes. The Shelly 1L Gen3 (with Bypass) is controlled locally in Home Assistant through a built-in Home Assistant core integration (shelly), so it keeps working if your internet connection or the Shelly cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Shelly 1L Gen3 (with Bypass) use, and do I need a hub?
- The Shelly 1L Gen3 (with Bypass) uses Wi-Fi and Bluetooth and Matter. To pair it with Home Assistant you need no hub — it joins your Wi-Fi network directly; or a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy; or a Thread border router if it is Matter-over-Thread, or just your Wi-Fi network if it is Matter-over-Wi-Fi. Shelly's own hub is not required when you integrate through a built-in Home Assistant core integration (shelly).
- How much does the Shelly 1L Gen3 (with Bypass) cost in the UK?
- The lowest price we have listed for the Shelly 1L Gen3 (with Bypass) is £26.24 at Amazon UK, with other UK retailers at up to £31.20. Prices were last checked in October 2026 and change often, so confirm on the retailer's page before buying.