The Sonoff Zigbee Dry Contact Smart Switch (MINI-ZBD) is a Zigbee 3.0-based smart relay with dry contact switching, specifically designed for controlling devices such as garage doors, motors, boilers, or other systems with control inputs. The dry contact operation ensures fully isolated control, meaning the controlled circuit is electrically separated from the relay’s power supply, increasing safety and reducing the risk of failure.
The device supports both AC and DC power supply (100–240V AC or 12–48V DC), providing exceptional flexibility during installation. Its compact size allows easy integration into junction boxes or control panels, making it an excellent choice for retrofit smart home projects.
The Sonoff MINI-ZBD not only functions as a controller but also acts as a Zigbee router (signal repeater), improving the stability and range of your smart home network. When connected to a Zigbee hub, it can be controlled remotely, integrated into automations, and operated via voice control.
It is an excellent solution for applications such as garage door automation, where opening and closing can be controlled via a mobile app, or for thermostat systems where heating can be optimized with smart scheduling. When used with a contactor, it can safely control high-power systems with low current, reducing load on the control circuit.
It is also suitable for controlling low-power DC devices (up to 8W), such as solenoid valves or small motors, making it ideal for irrigation systems or other automated mechanical setups.
About the Sonoff brand
Sonoff is one of the most well-known smart home brands, offering affordable and reliable Wi-Fi and Zigbee devices. Its products are popular in DIY and Home Assistant environments thanks to their wide compatibility and advanced features.
What is Zigbee?
Zigbee is a communication protocol designed specifically for smart home and IoT applications, enabling efficient and low-power communication between devices. Unlike Wi-Fi devices, Zigbee devices require a gateway (bridge/coordinator) to connect to the internet and allow remote control.
Zigbee reduces the load on your Wi-Fi network, as only the gateway connects to the router while other devices communicate via Zigbee. It also supports mesh networking, where mains-powered Zigbee devices can act as repeaters, extending network coverage.
Its low power consumption makes it ideal for battery-powered sensors, which can operate for years on a single battery. While it handles smaller data volumes, this is sufficient for control and status communication. Zigbee is an industry-standard protocol, ensuring interoperability between compliant devices.
Key product features
Zigbee control: Remote control and automation via hub
Dry contact output: Ideal for garage doors, boilers, motors
AC/DC power supply: 100–240V AC or 12–48V DC
Zigbee router function: Extends network coverage
Low-power device control: Suitable for up to 8W DC loads
Flexible switching modes: Inching, edge-triggered, and follow modes
Smart home protocols and platform compatibility
Protocol: Zigbee 3.0
Zigbee router: Functions as signal repeater
Native platform: eWeLink (requires Zigbee hub)
Third-party platforms: Alexa, Google Home, SmartThings, IFTTT
Home Assistant: ZHA and Zigbee2MQTT support
Voice control: Alexa, Google Assistant
Smart features
Remote control: ON/OFF switching via mobile app
Scheduling: Daily, weekly, and cyclic timers
Inching mode: Automatic ON/OFF switching with delay
Automations: Works with other devices (e.g., motion-triggered control)
Event log: Up to 3 months history
Power-on state: Restore state after power outage
External switch support: Multiple switch types supported
Electrical features
Power supply: 100–240V AC or 12–48V DC
Output: Dry contact (NO/NC/COM)
DC load: max. 24V DC / 2A or 12/24V DC / 8W
AC input: max. 0.1A
Output type: Potential-free relay
External switch input: S1, S2
Technical specifications
Product name: Sonoff MINI-ZBD
Type: Zigbee dry contact smart relay
Product line: MINI Dry
Model: MINI-ZBD
MCU: EFR32MG21
Wireless protocol: Zigbee 3.0 (IEEE 802.15.4)
Power supply: 100–240V AC, 50/60Hz (max. 0.1A) or 12–48V DC (max. 1A)
Output type: Dry contact relay (NO/NC/COM)
Load capacity: 24V DC max. 2A (resistive) or 12/24V DC max. 8W
Supported loads: Low-power DC motors, solenoid valves, control inputs
External switch input: S1, S2 (multiple modes supported)
Size: 41 × 43 × 21.5 mm
Weight: 35.3 g
Color: White
Housing: PC (polycarbonate)
Wiring: 0.75–1.5 mm² (18–14 AWG)
Installation: Indoor (flush-mounted or in enclosure)
Operating temperature: -10°C – +40°C
Humidity: 5–95% RH (non-condensing)
Max. installation altitude: < 2000 m
Pollution degree: II
Rated impulse voltage: 4 kV
Electrical endurance: 20,000 cycles
Control type: 1.B
Platform: eWeLink
Compatibility: Home Assistant (ZHA, Zigbee2MQTT), Alexa, Google Home, SmartThings, IFTTT
FCC ID: 2APN5-MINIZBD
Certifications: CE, FCC, RoHS
