NodOn Zigbee Multifunction Relay Switch with Metering Review: An In-Wall Relay That Measures What It Switches
The NodOn Zigbee Multifunction Relay Switch with Metering (SIN-4-1-21) is a concealed 14A relay that switches one 230 V circuit and reports its instantaneous power and cumulative energy. Its potential-free output works as a held dry contact for a boiler or water heater, a pulsed one for gates, garage doors and electric latches, or a wet contact for a socket or lighting line, and an optional wired switch on its input keeps manual control. It carries all four protections, acts as a Zigbee router and runs locally through Home Assistant, but it needs a Zigbee coordinator and has no Matter, Apple Home or Google Home support.
- Metering a water heater or boiler circuit
- Home Assistant and Zigbee2MQTT households
- Gates, garage doors and electric latches
- Retrofitting a socket or lighting line
Pros
- Switches and measures one 230 V circuit up to 14A and 3000W
- Instantaneous power (W) and cumulative energy (Wh) metering
- Potential-free output, held or pulsed, for boilers, gates and latches
- Optional wired switch input with monostable or bistable detection
- Overheating, overvoltage, overcurrent and overpower protection
- Acts as a Zigbee router, with over-the-air updates
- Local control through Home Assistant via ZHA or Zigbee2MQTT
- Compact 44 x 40 x 16.9 mm module, under 1W idle
Cons
- Needs a Zigbee hub, no Wi-Fi radio
- Requires a neutral wire
- No metering when wired as a dry contact
- No Matter, Apple Home or Google Home support
- Alexa control is on/off only
- No on/off button on the module
- DIN-rail mounting needs an optional accessory
Who is the NodOn Zigbee Multifunction Relay Switch with Metering for?
It suits anyone who wants smart control and energy data on a circuit a plain smart switch cannot handle. The potential-free output is the right tool for equipment that is not a simple light: a boiler or water heater call, a gate or garage door operator, an electric latch, or a socket to switch and monitor. It is a flush-mount module that hides behind a wall switch or in a junction box, and the optional NodOn DIN Rail Box moves it into the electrical panel. It joins a Zigbee network, so it fits a home that already has a coordinator.
What the NodOn Zigbee Multifunction Relay Switch with Metering offers
It switches and measures in the same unit: an output rated up to 14A and 3000W at 230 V for resistive loads, with inductive and capacitive loads also supported, plus instantaneous power (W) and cumulative energy (Wh) that Zigbee2MQTT exposes as power and energy. It can be wired as a dry contact, held or pulsed, or as a wet contact that passes the input's potential to the load. A wired switch on the input is optional and the module detects whether it is monostable or bistable, so an existing wall switch keeps working and can drive automations. Overheating, overvoltage, overcurrent and overpower protection are all built in, power-off memory restores its state after an outage, it draws under 1W idle, it takes over-the-air updates, and being mains-powered it acts as a Zigbee router that strengthens the mesh. At 44 x 40 x 16.9 mm and 34 g it fits a standard flush box, with a 2 year warranty.
What to know before you buy
It needs a Zigbee hub and has no Wi-Fi radio. A neutral wire is required. Metering comes with a condition: the measurement is not available when the module is wired as a dry contact. Platform support is narrow outside Home Assistant: Alexa can only switch it on and off with no energy data, SmartThings support may be limited, and there is no Google Home, Apple Home or Matter. There is no on/off button on the module, so manual control relies on a wired switch at the input, and DIN-rail mounting needs the separate DIN Rail Box. It has a single relay channel and no shutter or interlock mode.
Is the NodOn Zigbee Multifunction Relay Switch with Metering worth it?
For one hard-to-automate circuit it packs a potential-free output, a 14A rating, full protections and energy metering into a module small enough to disappear into a flush box. In a home running Home Assistant or Zigbee2MQTT it is a practical pick for water heaters, boilers, gates and switched sockets. Anyone who needs Matter, Apple Home or Google Home, or who will wire it as a dry contact and still wants metering, should look elsewhere.
Frequently asked questions
Does the NodOn Zigbee Multifunction Relay Switch with Metering need a hub?
Yes. It is a Zigbee device with no Wi-Fi, so it needs a Zigbee coordinator such as Home Assistant with ZHA or Zigbee2MQTT.
Does it measure energy use?
Yes. It reports instantaneous power in watts and cumulative energy in watt-hours. The measurement is not available when the module is wired as a dry contact.
Does it need a neutral wire?
Yes. A neutral wire is required at the installation point.
Can it control a gate, garage door or electric latch?
Yes. Its potential-free output works as a pulsed dry contact for gates, garage doors and electric latches, and as a held dry contact for a boiler or water heater.
Does it work with Alexa, Google Home or Apple Home?
Alexa can switch it on and off but does not show energy data, and SmartThings support may be limited. It does not work with Google Home, Apple Home or Matter. Home Assistant exposes both switching and metering.



