Devices for local smart homes

Sonoff SPM-4Relay stackable power meter module with 4 relays 20 A

Renting rooms or running a workshop means knowing where the kilowatt-hours go: SPM-4Relay meters four 20 A lines separately and works only paired with the SPM-Main head unit.

Sonoff POWR3 25 A / 5500 W Wi-Fi smart switch with energy monitoring

Built for the heaviest loads in a home — instant water heaters, electric boilers, saunas — the POWR3 switches up to 25 A / 5500 W and meters every kilowatt-hour they burn.

A 2024-built flat has a two-gang switch but no blue wire in the box — the MINI-ZB2GS-L makes both lighting lines smart without a neutral, over Zigbee.

Thirty Wi-Fi clients on the family router are plenty — this Duo keeps both lighting lines off the 2.4 GHz band, runs them over Zigbee and relays the mesh as a router.

Sixteen-amp relays run out of margin next to a storage water heater; the POWR320D carries up to 20 A with room to spare and logs every kilowatt-hour of heating, hour by hour.

One Duo module behind a double rocker runs both lighting lines at once — chandelier and sconce keep their own wall keys yet switch independently via app or voice, 10 A per channel.

A glance at the relay tells you watts, volts, amps and total kWh on its built-in LCD — no phone required, with six months of hourly history kept in eWeLink.

POW Origin turns electricity-bill guesswork into hourly kilowatt-hour records — a week of eWeLink charts shows which appliance leads, with six months of history kept.

Matchbox-sized and 40% smaller than the ZBMINIL, the ZBMINIL2 tucks into the cramped box behind an existing switch and makes the light smart with no neutral.

A boiler or a gate motor does not want 220 V from a relay — it waits for two signal wires to close, and the MINI-D dry contact does exactly that on app, schedule or voice command.

A regular relay will not fit behind the switch in a shallow flush box — the 39.5×33×16.8 mm MINIR4M will, 40% smaller than MINIR2 and with a Detach Relay mode on top.

Hidden in the box behind a two-gang switch with no neutral, the Moes Zigbee module runs two light lines from the app while keeping the wall key.

Tucked behind an existing 2-gang switch, this Matter-over-Wi-Fi relay joins Apple Home, Google Home and Alexa directly, with no extra gateway to buy.

When a renovation already runs a neutral to every switch box, the ZBMINIR2 uses it to keep a light on local Zigbee — controlled by your hub, not a cloud.

Lighting a whole flat takes a relay per light point, so unit price decides: the Wi-Fi MINIR4 Extreme keeps 10 A and Detach Relay while costing less than its Matter sibling.

Countless DIY smart homes began with a cheap Sonoff Basic relay. The fifth generation keeps that recipe — one 10 A line, nothing extra — and now speaks Matter.

A watering valve on a schedule, a heater on a timer, garage lighting from your phone — the BASICR4 covers these first automation jobs with one 10 A channel at minimal cost.

Z-Wave Long Range DIN-rail relay with 3 potential- channels rated 16 A each (48 A total), Z-Wave 800 series, 110-240 V; a Z-Wave controller is required.

Z-Wave DIN-rail relay with 2 channels, 16 A per channel and 25 A total, plus built-in power metering on each circuit. A compatible Z-Wave gateway is required.

Two-channel Z-Wave 800 DIN-rail relay, 16 A per channel, potential- contacts and S2 security. A Z-Wave hub is required to operate it.

Single-channel Z-Wave DIN-rail relay rated to 16 A with built-in power metering. Needs a Z-Wave hub and electrician install inside the panel.

Professional Z-Wave DIN-rail relay, single channel with dry contact up to 16 A for breaker-box mounting. A compatible Z-Wave gateway is required.

Miniature Z-Wave module that meters electrical consumption up to 16 A, with no switching. Needs a Z-Wave hub and fits inside a wall box.

Miniature Z-Wave Long Range relay with one 8 A channel and power metering, adding existing appliances to a Z-Wave network through a compatible hub.