SwitchBot
SwitchBot Curtain 3 (U-Rail)
- Works with HA
- Local control
- Bluetooth
Prices verified September 2026
See more blinds & curtains picks on our Amazon storefront →Our verdict
Identical certified hardware and firmware to the Rod version we already list — this is just the rail-clip adapter for U-shaped curtain track, more common in UK new-builds and rented flats than a plain pole. It handles curtains up to 15kg and runs on a 3350mAh battery rated for roughly 8 months per charge (SwitchBot's own test: one cycle a day on an 8kg curtain), with an optional Solar Panel 3 accessory that tops it up indefinitely off a few hours of daylight. Only worth listing separately because the wrong rail adapter won't clip on; if you already own the Rod version's clip kit, this isn't a different product.
What can Home Assistant control on the SwitchBot Curtain 3 (U-Rail)?
| Control | Type | What it does |
|---|---|---|
| Position | Cover (0-100%) | Open/close/stop and set-position; values above 95% and below 5% are clamped to fully open/closed. |
| Battery | Sensor (%) | Bluetooth-only — updates when the device is in direct range of the HA host or a Bluetooth proxy. |
| Light level | Sensor | Coarse ambient light reading from the onboard sensor, also Bluetooth-only. |
| Movement speed | Config (app-only) | Set in the SwitchBot app, not exposed as an HA entity; trades travel speed against motor noise and mechanical wear, identical on both rail and rod adapters. |
Runs through HA's native switchbot integration exactly like the Rod version — same cover entity, same firmware, same Bluetooth link. Calibration (setting the physical open/closed end-stops) has to be done once in the SwitchBot app before HA control works, and it's the same rotation-counting process regardless of rail or rod — the U-rail clip only changes how the bot grips the track, not the motor's calibration logic, so there's no meaningful HA-side difference between the two variants. Battery and light-level sensors only update over direct Bluetooth, not through a Hub, so expect gaps if the device drifts out of range or the companion app hogs the connection.
Specs
| max load | 15kg |
|---|---|
| dimensions | 66 x 51 x 173mm, 280g |
| mount type | U-Rail track clip |
| battery life | Up to 8 months per charge (SwitchBot test: one open/close cycle daily on an 8kg curtain) |
| battery type | 3350mAh rechargeable lithium-ion, USB-C charging |
| solar panel accessory | SwitchBot Solar Panel 3 (sold separately) — trickle-charges via USB-C, ~3 hours of daylight for continuous runtime |
How does the SwitchBot Curtain 3 (U-Rail) compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| SwitchBot Curtain 3 (U-Rail) (this product) | £66.99 | Bluetooth | Yes | Works with HA |
| Aqara Curtain Driver E1 (Rod) | £89.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Curtain Driver E1 (Track Version) | £80.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Roller Shade Driver E1 | £49.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the SwitchBot Curtain 3 (U-Rail) work with Home Assistant locally?
- Yes. The SwitchBot Curtain 3 (U-Rail) is controlled locally in Home Assistant through a certified "Works with Home Assistant" integration (switchbot), so it keeps working if your internet connection or the SwitchBot cloud goes down. Control and state updates stay on your own network.
- Which protocol does the SwitchBot Curtain 3 (U-Rail) use, and do I need a hub?
- The SwitchBot Curtain 3 (U-Rail) uses Bluetooth. To pair it with Home Assistant you need a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy. SwitchBot's own hub is not required when you integrate through a certified "Works with Home Assistant" integration (switchbot).
- How much does the SwitchBot Curtain 3 (U-Rail) cost in the UK?
- The lowest price we have listed for the SwitchBot Curtain 3 (U-Rail) is £66.99 at Amazon UK. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.