The SONOFF MINI ONE PM (MINI-ZB1GSP) is a Zigbee 3.0 flush-mounted 1-gang smart relay with energy monitoring. The device operates on a single-phase 100–240 V AC electrical system and can switch resistive loads with a rated current of up to 16 A. Both live and neutral conductors are required for operation.
The relay measures mains voltage, current, instantaneous power, and consumed energy. Bidirectional metering records energy drawn from the grid separately from energy transferred in the opposite direction, making it suitable not only for monitoring electrical loads but also, for example, for tracking the production of plug-in balcony solar systems. The two parallel L Out terminals belong to the same relay output and therefore cannot be controlled as separate circuits.
The switch input can be used with both toggle switches and push buttons. Selectable pulse, edge, and follow modes allow operation to be adapted to the existing wall switch. Detached Relay Mode separates the external switch input from the relay output, allowing wall switch events to be used in automations without interrupting the power supply of devices such as smart bulbs.
The MINI-ZB1GSP uses Zigbee 3.0 communication and, as a mains-powered Zigbee router, forwards the data traffic of other devices within the mesh network. In Turbo Mode, it operates with increased radio transmission power. The built-in Bluetooth connection is used for pairing and for the local eWeLink Proximity Mode connection. A phone can connect directly to the device when the Zigbee gateway is unavailable or the network connection is unstable. At present, at least the phone must have some form of internet access or mobile data subscription to use this function.
About SONOFF
SONOFF manufactures smart home devices, flush-mounted relay modules, energy meters, wall switches, Zigbee sensors, gateways, and control panels. Its product range includes devices using Wi-Fi, Zigbee, and Matter communication.
The manufacturer’s devices are primarily designed for the eWeLink platform. Many SONOFF Zigbee products can also be used with Home Assistant, Zigbee2MQTT, ZHA, SmartThings, and other compatible Zigbee systems.
Key Product Features
- Zigbee 3.0 communication: The relay also operates as a Zigbee router, forwarding data traffic from other Zigbee devices and improving mesh network coverage, stability, and communication reliability.
- Retrofit installation: Thanks to its compact size, it can be installed in a wall box behind a switch or socket. It can be used to control lighting, fans, heating, and other single-phase circuits.
- Energy monitoring: Measures voltage, current, and power in real time, while also providing energy history and charts. Recorded data can be exported.
- Bidirectional energy metering: Separately tracks consumed energy and energy transferred in the opposite direction, making it suitable for monitoring the production of smaller solar systems.
- Electricity cost tracking: A custom currency, unit price, and time-based tariff can be configured. eWeLink displays calculated costs and their changes in charts.
- Electrical protection: Overcurrent, overvoltage, undervoltage, overload, and overheating protection switch off the relay output when the configured threshold is reached.
- Home Assistant integration: Can be connected to a local smart home system using ZHA or Zigbee2MQTT.
- Bluetooth Proximity Mode: The eWeLink app can access the device directly over Bluetooth when the Zigbee gateway or network connection is unavailable.
Smart Home Protocols and Platform Compatibility
- Zigbee 3.0: Uses IEEE 802.15.4-based wireless communication. A compatible Zigbee gateway or coordinator is required for normal remote operation.
- Zigbee router: The mains-powered relay forwards data traffic from other Zigbee end devices. The manufacturer specifies a communication range of up to 180 m in open areas in default mode and up to 250 m in Turbo Mode.
- Bluetooth: Used for pairing and direct nearby eWeLink access. It does not operate as a general Bluetooth smart home protocol and does not replace the Zigbee coordinator for full system integration.
- Proximity Mode: A phone can connect directly to the relay over Bluetooth if the Zigbee gateway is offline or the network connection is unstable. Basic control and configuration functions are available in this mode.
- eWeLink: With a compatible SONOFF Zigbee gateway, switching, energy monitoring, energy history, tariff management, scheduling, electrical protection, scenes, and device sharing are available.
- Recommended SONOFF gateways: ZBBridge-P, ZBBridge-U, NSPanel Pro, and iHost.
- SONOFF USB coordinators: Can be used with Home Assistant or eWeLink CUBE systems, including ZBDongle-P, ZBDongle-E, Dongle Plus MG24, Dongle Lite MG21, and Dongle Max.
- Home Assistant: Can be connected through Zigbee2MQTT or ZHA integration. Relay control, measurement data, and several configuration functions can be used in local automations.
- Zigbee2MQTT: Supports relay state, power-on state, external switch type, Detached Relay Mode, inching, Turbo Mode, voltage, current, power, and energy data, as well as multiple protection and diagnostic states.
- MQTT integration: When Zigbee2MQTT is used, relay state and measurement data can be managed through MQTT messages. The MQTT connection is created by Zigbee2MQTT, not by the relay itself.
- ZHA: Can be used in a Home Assistant ZHA network. The SONOFF-provided minizb1gsp.py script may be required for the full manufacturer feature set.
- Zigbee binding: A direct connection can be created with a compatible Zigbee device. According to the manufacturer’s example, an SNZB-01M button can directly control the relay after the initial Home Assistant setup without continuous involvement from the automation hub.
- Samsung SmartThings: Can be used with the Aeotec Smart Home Hub V3. On/off control is supported, while displaying energy data requires importing a separate SmartThings script.
- Amazon Alexa: Can be paired directly with Echo Plus 2nd Gen, Echo 4th Gen, and Echo Show 2nd Gen devices with built-in Zigbee hubs. Alexa supports on/off control, but energy monitoring data is not available.
- Google Home: Can be controlled through cloud account linking when connected to a SONOFF Zigbee gateway and eWeLink account.
- IFTTT: Relay switching and state changes can be used in IFTTT automations by linking the eWeLink account.
- Matter Bridge: Can be exposed to Matter platforms through a ZBBridge-U, iHost, or eWeLink CUBE system using a SONOFF Zigbee coordinator.
- Apple Home: Can be used through a compatible SONOFF Matter Bridge. The MINI-ZB1GSP is not a Matter device by itself.
- Local operation: When used with Home Assistant and a local Zigbee coordinator, relay control and current measurement data can be managed without an internet connection.
Smart Features
- Remote on/off control: The relay output can be controlled from the eWeLink app or the connected smart home system.
- Current state monitoring: The system displays whether the relay is on or off.
- Energy history: eWeLink stores up to one year of energy data in the cloud and displays it in hourly, daily, or monthly views.
- Offline data recording: If the Zigbee connection is unavailable, the relay continues storing energy data locally. The data is synchronized when the connection is restored. No data can be recorded during a complete power outage.
- Data export: Energy data and electricity cost reports can be exported in a format suitable for processing in Excel.
- Fixed tariff: A custom currency and uniform electricity rate can be configured.
- Time-based tariff: Different electricity rates can be assigned to different time periods.
- Cost report: eWeLink creates detailed cost charts based on measured energy and the configured tariff.
- Scheduling: Automatic on/off switching can be configured for specified times.
- Countdown: The relay performs the configured switching action after the selected delay.
- Inching: The relay automatically switches on or off after the configured time.
- Work cycle completion detection: If the load remains below the configured power threshold for a specified time, the system can send a notification or switch off the relay.
- Delayed completion detection: The configured duration filters out brief power drops during operation.
- Maintenance runtime tracking: The system totals the time during which the load’s power consumption remains above the specified value.
- Maintenance reminder: A notification can be sent when the configured accumulated runtime is reached.
- Overcurrent protection: The relay automatically switches off when the configured current limit is exceeded.
- Overload protection: The output switches off when the configured power limit is exceeded.
- Overvoltage and undervoltage protection: Lower and upper voltage limits can be configured, and exceeding either limit triggers automatic shutdown.
- Overheating protection: The relay disconnects the load if the internal temperature rises abnormally.
- Power chart: The system records changes in consumption and power over the selected period.
- Scenes and automations: Relay state, external switch actions, and measured electrical values can be used as automation conditions.
- Group control: Multiple compatible eWeLink devices can be grouped and switched simultaneously.
- Device sharing: Relay control can be shared with other eWeLink accounts.
- Switching log: eWeLink records relay state changes.
- Push notifications: Notifications can be configured for switching state, consumption events, and activation of electrical protection functions.
- Power-on state: The relay can be configured to start in the on, off, or previous state after a power outage.
- Indicator light mode: The status indicator can be set to automatic, off, or scheduled night mode.
- Reset energy data: Accumulated energy data can be deleted. This operation also removes the related history.
- Turbo Mode: The Zigbee module can operate at maximum transmission power.
- OTA firmware update: Supported through compatible SONOFF gateways, ZHA, or Zigbee2MQTT systems.
Electrical Functions
- Power supply: 100–240 V AC, 50/60 Hz.
- Electrical system: Designed for single-phase use.
- Neutral conductor: Both live and neutral conductors must be connected for operation.
- Number of switched circuits: 1-gang relay designed to switch one live conductor.
- Rated load: Up to 16 A for resistive loads.
- Relay output: The device switches the live conductor at the L Out output.
- Two L Out terminals: The two output terminals are internally connected in parallel. Two connected loads switch on and off simultaneously, and the number of terminals does not increase the 16 A rated load.
- Voltage measurement: Measures the instantaneous mains voltage.
- Current measurement: Measures the current drawn by the connected load.
- Power measurement: Reports instantaneous active power in watts to the connected system.
- Energy measurement: Daily, monthly, and total consumed energy can be monitored.
- Bidirectional metering: Incoming and outgoing energy can be counted separately.
- Switch input: Includes one S1 input for connecting an external switch or push button.
- Supported switch types: Toggle switches and momentary push buttons can be used.
- Pulse mode: Each short press of the push button toggles the relay state.
- Edge mode: Every state change of the external switch toggles the relay, regardless of the switch’s physical position.
- Follow mode: The relay state follows the position of the external toggle switch.
- Detached Relay Mode: Changes at the switch input do not directly switch the relay output. The input event can be used in automations while the connected load remains continuously powered.
- Automatic off and on: The inching function automatically changes the relay state after the configured time.
- Power-on delay: In Zigbee2MQTT, the relay can be configured to assume the selected state after a delay when power is restored.
- Protective shutdown: In the event of overcurrent, overload, overvoltage, undervoltage, or overheating, the device physically disconnects the relay output.
- Upstream protection: The manufacturer requires a circuit breaker or RCBO rated at no more than 16 A and compliant with local regulations to be installed upstream of the device.
- Recommended wire: 0.75–2.5 mm² solid or stranded copper conductor.
Technical Specifications
- Product version: MINI ONE PM (Zigbee version)
- Product series: MINI Extreme Series Gen5
- Product name: Zigbee Smart Switch
- Model: MINI-ZB1GSP
- MCU: EFR32MG21
- Ratings: 16 A, 100–240 V AC, 50/60 Hz, up to 16 A resistive load
- Zigbee: IEEE 802.15.4
- Net weight: 27.3 g
- Dimensions: 39.5 × 33 × 16.8 mm
- Colour: White and green
- Housing material: PC
- Recommended wire cross-section: 18–14 AWG, 0.75–2.5 mm², solid or stranded copper conductors only
- Installation location: Indoor, concealed installation
- Operating temperature: -10 °C to +40 °C
- Operating humidity: 10–90% RH, non-condensing
- FCC ID: 2APN5-MINIZB1GSP
- Certifications: CE, RoHS, FCC
