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Zigbee devices Smart plugs with energy metering

Aqara WS-USC03

Smart wall switch (with neutral, single rocker), US. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Aqara
Model
WS-USC03
Type
Smart plugs with energy metering
Power
mains: usually a router that extends the mesh
Firmware updates (OTA)
yes, through Zigbee2MQTT

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
On / offstate—settable
Flip indicator lightflip_indicator_light—settable
Power outage countpower_outage_count—read only
Device temperaturedevice_temperature°Cread only
PowerpowerWread only
EnergyenergykWhread only
VoltagevoltageVread only
Remember state after power losspower_outage_memory—settable
Operation modeoperation_modecontrol_relay, decoupledsettable
Action (button press)actionsingle, doubleread only

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "state": "ON",
  "flip_indicator_light": false,
  "power_outage_count": 0,
  "device_temperature": 31,
  "power": 12.4,
  "energy": 3.21,
  "voltage": 230,
  "power_outage_memory": false,
  "operation_mode": "control_relay",
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state":"TOGGLE"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"flip_indicator_light":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"power_outage_memory":true}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"operation_mode":"decoupled"}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Turn off when idle"
  mode: single
  triggers:
    - trigger: numeric_state
      entity_id: sensor.my_device_power
      below: 2
      for: "00:15:00"
  actions:
    - action: switch.turn_off
      target:
        entity_id: switch.my_device

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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