---
title: Shelly Pro 3 - Three-Channel Relay With Potential-Free Outputs Supporting A Total Of 48A
date: 2025-11-03T10:12:35Z
modified: 2026-05-19T10:05:26Z
permalink: "https://tech.co.za/product/shelly-pro-3-three-channel-relay-with-potential-free-outputs-supporting-a-total-of-48a/"
type: product
status: publish
excerpt: "3 outputs, 16A each. Total device maximum of 48A\\nDry contacts\\nOverpower and overvoltage protection of the load.\\nEasy control through the Shelly app, various protocols, and platforms, as well as voice assistants"
wpid: 557185
product_brand:
  - Shelly
product_type:
  - simple
product_visibility:
  - featured
product_cat:
  - Smart Home
featured_image: "https://tech.co.za/wp-content/uploads/2025/11/SHELLY-PRO-3a.png"
---

### 3-channel relay with potential-free outputs, supporting a total of 48A for professional automation of residentials or commercial use. Control temperature or lights automation in large spaces.





- LAN, Wi-Fi, and Bluetooth connection
- 3 outputs, 16A each. Total device maximum of 48A
- Dry contacts
- Overpower and overvoltage protection of the load.
- Easy control through the Shelly app, various protocols, and platforms, as well as voice assistants
- Supports control of 3 differnt phases
- Supports KNXnet / IP communication





![](https://shellysa.co.za/wp-content/uploads/2025/08/shelly-pro-3_wiring_01.png)

Resistive load![](https://shellysa.co.za/wp-content/uploads/2025/08/shelly-pro-3_wiring_02.png)

Inductive load and RC snubber

| **Terminals** | Wires |  |  |
| --- | --- | --- | --- |
| **I1**, **I2, I3** | Load circuit input terminals | **L1(A)** | Load circuit 1 live (110-240 V) wire |
| **O1**, **O2, O3** | Load circuit output terminals | **L2(B)** | Load circuit 2 live (110-240 V) wire |
| **S1**, **S2, S3** | Switch/button input terminals | **L3(C)** | Load circuit 3 live (110-240 V) wire |
| **L** | Live (110-240 V) terminal | **N** | Neutral wire |
| **N** | Neutral terminal |  |  |
| **LAN** | Local Area Network RJ 45 connector |  |  |

### Specifications



| **Physical** |  |
| --- | --- |
| Size (HxWxD): | 96x53x59 ±0.5 mm / 3.78×2.01×2.32 ±0.02 in |
| Weight: |  |
| Mounting: | DIN rail |
| Screw terminals max torque: | 0.4 Nm / 4.43 lbin |
| Conductor cross section: | 0.5 to 2.5 mm² / 20 to 14 AWG |
| Conductor stripped length: | 6 to 7 mm / 0.24 to 0.28 in |
| Shell material: | Plastic |
| Color: | Black |
| **Environmental** |  |
| Ambient temperature: | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity | 30 % to 70 % RH |
| Max. altitude | 2000 m / 6562 ft |
| **Electrical** |  |
| Power supply voltage AC: | 110 – 240 V |
| Power supply voltage DC: | N/A |
| Power consumption: | < 3 W |
| Neutral not needed: | No |
| **Output circuits ratings** |  |
| Max switching voltage AC: | 240 V |
| Max switching voltage DC: | 30 V |
| Max switching current AC: | 16 A per channel, 48 A total |
| Max switching current DC: | 16 A per channel, 48 A total |
| **Sensors, meters** |  |
| Internal-temperature sensor: | Yes |
| **Radio** |  |
| RF band: | 24010- 2495 MHz |
| Max. RF power: | <20 dBm |
| Wi-Fi protocol: | 802.11 b/g/n |
| Wi-Fi Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions) |
| Bluetooth Protocol: | 4.2 |
| Bluetooth Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions) |
| **MCU** |  |
| CPU: | ESP32-D0WDQ6 |
| Flash: | 8 MB |
| **Firmware capabilities** |  |
| Schedules: | 20 |
| Webhooks (URL actions): | 20 with 5 URLs per hook |
| Scripting: | Yes |
| MQTT: | Yes |
| CoAP: | No |