Sonoff MINI Smart Dry Contact Switch (Zigbee) | MINI-ZBD

What does dry contact mean?

Think of it as a switch controlling another device’s signal: the output terminals do not provide a ready-made power supply. A qualified installer selects COM with NO or NC according to the device’s wiring diagram; NO is normally open and NC is normally closed. It therefore suits inputs designed for dry-contact control, rather than automatically making any electrical device compatible.

Practical uses after checking compatibility

• Garage door or electric gate: Send a command to the switch input on a compatible motor controller instead of passing the motor’s main power through MINI-ZBD. A short pulse can be configured when the input requires a momentary press; the original anti-entrapment and safety protections must remain active.
• Heating and climate control: Request operation through a compatible dry-contact input on a boiler or heating system, rather than powering the heater or compressor directly. The system technician determines NO/NC logic and each input’s requirements, especially where a system needs more than one signal.
• Irrigation and small valves: Schedule a low-power DC valve or motor within the 8 W limit and at the correct voltage, or control the input of an external irrigation controller. It does not directly operate a large water pump.
• Low-voltage home projects: Combine a small DC control or a compatible electric projection-screen input in one scene. Higher-power loads need an intermediate circuit designed by a qualified specialist, such as a contactor with a compatible DC coil and suitable protection; this does not increase the module’s output rating.

Configure how it responds, not just on and off

• Automatic pulse — Inching: The output returns automatically after the period you set, which is useful for simulating a switch press. Availability depends on the gateway and integration; do not assume every platform exposes this option.
• External switch: S1 and S2 support a suitable switch, with pulse, edge-change or following-state response options. The installer should check the switch mode before relying on it.
• Separating the switch from the relay: On a supporting system, Detach Relay lets a switch event trigger a scene instead of linking it directly to the output state.
• When power returns: Set the output state after power is restored and test it for the connected door or valve; the safe state is not the same for every application.
• Shared schedules and scenes: Activate the output at set times or link it to a compatible sensor through your platform. Timer, log, Turbo and switch-setting features depend on gateway support and its software version.

Compatibility to check before buying

For eWeLink, choose a supporting SONOFF Zigbee gateway. Home Assistant integration is possible through a Zigbee coordinator and ZHA or Zigbee2MQTT, but settings are not identical. ZHA may require the manufacturer’s setup script depending on the integration version. Apple Home connectivity uses a compatible Matter bridge; MINI-ZBD is not a native Matter device. The manufacturer’s table excludes Philips gateways, and SmartThings may require a dedicated driver.

Questions to help you choose

What you need for installation

• A compatible Zigbee gateway; the manual recommends ZBBridge-P and ZBBridge-U. It does not work directly with the router.
• One of the two power-supply options according to the specifications: 100–240 V AC or 12–48 V DC.
• Indoor use, with an electrician checking device-input compatibility and output limits: a resistive load up to 24 V DC / 2 A, or a low-power 12/24 V DC motor up to 8 W.

Key specifications