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Samotech SM309-S in Home Assistant

Wall switches · Zigbee · Zigbee dimmer 400W with power and energy metering

Zigbee2MQTT Quirk proposed, not merged yet

Zigbee device – see the note above on what ZHA needs for it.

We have a detailed page on this device with compatibility ratings and prices. Details and compatibility

Brand: Samotech
Model: SM309-S
Device type: Wall switches
Radio: Zigbee
Power: Mains powered
Reports itself as: SM309-S
Zigbee2MQTT: Device page on zigbee2mqtt.io

Where to buy

How the device gets into Home Assistant

official ZHA – with a Zigbee coordinator and the ZHA integration; for all its functions it needs a custom quirk, see above. Integration
add-on Zigbee2MQTT – Zigbee2MQTT runs as an add-on and passes the device on to Home Assistant over MQTT. Integration · Source

Known problems and fixes

Changes proposed for ZHA

pull request A change to ZHA for this device has been proposed and is waiting for review. since May 27, 2026 · zha-device-handlers #5039

ZHA quirks for this device

Quirk proposed, not merged yet Recommended quirk

Proposed to ZHA and waiting for review – the maintainers check it before it becomes part of Home Assistant.

Adds: External switch type

Source: zha-device-handlers · pull request #5039 · by @fidusachates · May 27, 2026
Signature: Samotech / SM309-S

The quirk is not part of ZHA yet. You can use it as a custom quirk until it is:

Tell ZHA where custom quirks are kept – in configuration.yaml:
```
zha:
  custom_quirks_path: /config/custom_zha_quirks/
```
Create that folder and save the quirk as a .py file in it.
Restart Home Assistant. If the device was paired before, reconfigure it or remove and pair it again so the quirk is applied.
Check it worked: the device page shows the quirk under Zigbee info.

A custom quirk has not been reviewed by the ZHA maintainers. Delete the file once the quirk is part of a Home Assistant release – otherwise the old copy takes precedence.

All quirks in the ZHA quirk database →