Shelly Plus Uni
Low-voltage control only · Not for mains loads
In stock · Ships in 1 to 2 business days
Choose options
Need a temperature reading from a tank, roof space or fridge?
A DS18B20 probe on the Shelly Plus Uni gives temperature in the app with alerts, and the 2 dry contacts can switch a fan or heater on the reading. Diagram: Shelly.
Low-voltage irrigation controller with app scheduling?
The Shelly Plus Uni dry contacts switch 24 V solenoids from a plug-pack, with schedules in the app and a rain-skip rule. Diagram: Shelly.
Humidity and temperature in a cellar or grow room?
A DHT22 sensor on the Shelly Plus Uni reports both, and the outputs can run an exhaust fan or dehumidifier from a rule. Diagram: Shelly.
Skip watering when it has rained?
A rain sensor on the Shelly Plus Uni input holds off the irrigation outputs automatically. Diagram: Shelly.
Count pulses from a water or gas meter?
The Shelly Plus Uni counts reed-switch pulses from a meter and shows consumption in the app. Diagram: Shelly.
Flow rate on a pump or tank fill?
A pulse flow meter on the Shelly Plus Uni input gives litres per minute and totals, and an output can stop the pump at a target. Diagram: Shelly.
Tank level on the phone?
A TL136 level sensor on the Shelly Plus Uni analogue input shows tank level as a percentage, with a low-level alert and a pump output. Diagram: Shelly.
Switch on at dusk without a timer that drifts?
An LDR on the Shelly Plus Uni analogue input reads ambient light, and a rule switches lights or a sign at a set level. Diagram: Shelly.
Key features
Analog and digital inputs: 1 analog, 2 digital, plus 1-Wire for temperature probes.
Pulse counting: reads utility or flow meters.
2 dry-contact outputs: potential-free, for driving external relays, contactors or low-voltage circuits.
Low-voltage only: 8 to 24 V AC / 9 to 28 V DC supply; not a mains switching device.
No hub needed: Wi-Fi direct with app control; wiring differs from the original Uni, so check the diagram before you buy.
Works with
Google Home
Amazon Alexa
Samsung SmartThings
Home Assistant
Shelly Smart Control app
MQTT
About this product
The Shelly Plus Uni is the flexible option for jobs that don't fit a standard relay or sensor: it's a low-voltage module (8-24 VAC / 9-28 VDC / 5 VDC) with 2 solid-state relay outputs on potential-free contacts, 2 digital inputs, 1 analog input, a pulse counter, and 1-Wire support for up to 5 DS18B20 temperature probes or a single DHT22. It's built to bolt smart control and monitoring onto older or unusual equipment rather than switch a mains circuit directly.
The new pulse-counting feature is the standout addition over the original Shelly Uni, useful for reading utility meters or flow meters that output pulses, giving genuine usage monitoring rather than just on/off state. If you are replacing an original Shelly Uni, note that the Plus Uni's inputs are wired differently, so it is not a drop-in swap.
Being a low-voltage device, the switching ratings are modest, 30 V / 300 mA per output. This is a control and sensing module, not a load-switching relay for mains appliances.
Model: SNSN-0043X
Low-voltage wiring only: confirm supply and load compatibility before install; not a mains relay, and not wired the same as the original Shelly Uni.
Tech specs
Physical
| Model | SNSN-0043X |
| Dimensions | 40 × 21 × 7 mm (PCB) |
| Weight | 8.5 g |
Electrical
| Max load | 300 mA per output at 30 V max (W not stated) |
| Power monitoring | No: has voltmeter and pulse counting, not power metering of its own load |
| Operating temperature | −20 to 40 °C |
Connectivity
| Wi-Fi | 802.11 b/g/n |
| Bluetooth | 4.2 |
Compatibility
| Compatibility notes | Low-voltage control/sensing module only: not a mains load switch; wiring differs from the original Shelly Uni, so it is not a drop-in replacement. |
In the box
| What's in the box | 1 × Shelly Plus Uni, quick start guide |
Warranty
| Manufacturer warranty | 3 Years |
| Free Ohmly extension | +1 Year Free Ohmly Warranty |
