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Zigbee devices Switches and relays

Schneider Electric U202SRY2KWZB

Ulti 240V 9.1 A 2 gangs relay switch impress switch module, amber LED. Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Schneider Electric
Model
U202SRY2KWZB
Type
Switches and relays
Power
mains: usually a router that extends the mesh
Firmware updates (OTA)
no

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
On / off (l1)state_l1—settable
On / off (l2)state_l2—settable
After power loss (l1)power_on_behavior_l1off, on, toggle, previoussettable
After power loss (l2)power_on_behavior_l2off, on, toggle, previoussettable

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_l1": "ON",
  "state_l2": "ON",
  "power_on_behavior_l1": "off",
  "power_on_behavior_l2": "off",
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_l1":"TOGGLE"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_l2":"TOGGLE"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"power_on_behavior_l1":"on"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"power_on_behavior_l2":"on"}'

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: "Off at night"
  mode: single
  triggers:
    - trigger: time
      at: "23:30:00"
  actions:
    - action: switch.turn_off
      target:
        entity_id: switch.my_device_l1

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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