# Shelly Plus Add-On For Shelly Gen3 And Gen4 Devices

## Shelly Plus Add-On For Shelly Gen3 And Gen4 Devices

The Shelly Plus Add-On is a small galvanically isolated expansion board that plugs into compatible Shelly Plus, Gen3, and Gen4 devices to add extra sensor and I/O capability beyond the host device's built-in inputs. It supports up to five DS18B20 temperature probes (via 1-Wire), or a single DHT22, plus NTC thermistors, photoresistors, PIR motion sensors, soil moisture sensors, and ultrasonic proximity sensors, making it useful for temperature-based automations like boiler control, freeze protection, or greenhouse monitoring.

### Specifications

**SKU**

SHELLY PLUS ADD-ON

**Brand**

Shelly

**Category**

Smart Home

**Key Specs**

Compatible with: Shelly Plus, Gen3, and Gen4 devices (device-dependent); Sensor support: up to 5x DS18B20 (1-Wire), 1x DHT22, NTC 10kΩ β=4000K, photoresistor, PIR, soil moisture, ultrasonic proximity; I/O: 1 analog input (0-10V), 1 digital input, reference voltage output; Power: 3.3V DC from host device, <0.5W consumption without sensors

## Details

- **Price:** 479.0 ZAR
- **Vendor:** Shelly
- **Type:** Smart Home
- **Tags:** Nology, Shelly, Smart Home

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 479.00 ZAR | In stock |

## Images

- Shelly Plus Add-On For Shelly Gen3 And Gen4 Devices

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> Source: [Guards On Duty Shop & Security Guards ](https://guardsondutyshop.co.za/products/shelly-shelly-plus-add-on)
> Updated: 2026-07-07