---
product_id: 604996448
title: "Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines"
brand: "shelly"
price: "HK$334"
currency: HKD
in_stock: false
reviews_count: 13
url: https://www.desertcart.hk/products/604996448-shelly-pro-3em-switch-add-on-add-on-pro-3em
store_origin: HK
region: Hong Kong
---

# 3-phase energy monitoring WiFi & Ethernet connectivity Dry contact relay control Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines

**Brand:** shelly
**Price:** HK$334
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Power your smart home like a pro—control, optimize, and save effortlessly!

## Quick Answers

- **What is this?** Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines by shelly
- **How much does it cost?** HK$334 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/604996448-shelly-pro-3em-switch-add-on-add-on-pro-3em)

## Best For

- shelly enthusiasts

## Why This Product

- Trusted shelly brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Real-Time Insights:** Track generation & consumption live with Shelly’s polished smart control app.
- • **Smart Load Shedding:** Automatically optimize energy use from solar & wind to slash your bills.
- • **Plug & Play Automation:** No hub needed—easy DIN rail mounting and instant app setup on iOS & Android.
- • **Seamless Energy Mastery:** Extend your Shelly Pro 3EM with isolated dry contacts for ultimate device control.
- • **Future-Proof Connectivity:** Supports WiFi, Ethernet, Modbus TCP, JSON & Matter for versatile integration.

## Overview

The Shelly Pro 3EM Switch Add-On is a DIN rail-mounted, electrically isolated dry contact switch that enhances the Shelly Pro 3EM’s capabilities. It enables advanced load shedding and PV system balancing by controlling contactors and high-energy devices based on real-time energy data from solar panels and wind turbines. With WiFi and Ethernet connectivity, no hub required, and a user-friendly iOS/Android app, it offers professional-grade home automation with seamless integration and a 5-year warranty.

## Description

desertcart.com: Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines : Industrial & Scientific

Review: Works perfectly and easy to install / setup - Excellent product and easy installation. Allows me to monitor a remote condo and keep tabs on the HVAC and power consumption. The app is well polished and provides all the information and control you would expect with this device
Review: Cool power monitor/relay great interfaces - Outstanding piece of kit. WiFi and wired Ethernet, web, JSON, Matter, Modbus and more all built in. Mine worked right out of the box. Got ic controlled via the web and MODBUS TCP. Handy device priced right.

## Features

- The Shelly Pro 3EM Switch Add-On is an add-on for Shelly Pro 3EM. An electrically isolated switch that extends the functions of your Shelly Pro 3EM device. With this add-on, you can easily control contactors and other electrical devices, giving you more flexibility and control over your consumption.
- Load shedding - Keep track of how much energy your solar panels and wind turbines are generating and save effortlessly by controlling your consumption with the Shelly Pro 3EM add-on. Connect the Shelly Pro add-on to your devices and use Shelly Pro 3EM's real-time information on how much energy has been generated and consumed. When you need to save energy.
- PV system balancing - If your PV system is producing more energy than your home is consuming, the Shelly Pro 3EM add-on can automatically activate devices to use it. For example, you can set it to turn on your water heater, electric vehicle charging station or other energy-intensive appliances.
- Shelly Customer Service - Shelly is one of the fastest-growing IoT brands in the world with devices, providing solutions for the automation of private homes, buildings and businesses. We provide our customers with professional support and a 5 years device warranty.
- Shelly Smart Control App will help you control your Shelly devices remotely and will send notifications for all automated events in your home. You can easily configure devices and manage their settings individually, or you can create personalized scenes by combining Shelly devices to trigger certain actions in your home automation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C718B37C |
| Best Sellers Rank | #29,124 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Industrial Power Meters |
| Date First Available | June 27, 2023 |
| Item Weight | 0.705 ounces |
| Item model number | Shelly_Pro_Add |
| Language | English |
| Manufacturer | Shelly |
| Product Dimensions | 4.72 x 2.36 x 7.48 inches |

## Images

![Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines - Image 1](https://m.media-amazon.com/images/I/714nLkRns4L.jpg)
![Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines - Image 2](https://m.media-amazon.com/images/I/81iq0IO6iOL.jpg)
![Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines - Image 3](https://m.media-amazon.com/images/I/71BO1pq3ehL.jpg)
![Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines - Image 4](https://m.media-amazon.com/images/I/8190vflWwTL.jpg)
![Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines - Image 5](https://m.media-amazon.com/images/I/91KqnU4FLEL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works perfectly and easy to install / setup
*by T***M on January 18, 2026*

Excellent product and easy installation. Allows me to monitor a remote condo and keep tabs on the HVAC and power consumption. The app is well polished and provides all the information and control you would expect with this device

### ⭐⭐⭐⭐⭐ Cool power monitor/relay great interfaces
*by D***A on February 6, 2026*

Outstanding piece of kit. WiFi and wired Ethernet, web, JSON, Matter, Modbus and more all built in. Mine worked right out of the box. Got ic controlled via the web and MODBUS TCP. Handy device priced right.

### ⭐⭐⭐⭐⭐ Pro level current meter at a bargain price!
*by C***E on July 12, 2025*

Fantastic current meter! The bonus is built in Ethernet! Small size will fit in tight spaces and easy install. Great function, except for some reason data download is not working right. There is also connection point for 1 more CT, but last I checked it is not sold separately. AND I wish there was short piece of DIN rail in box.

## Frequently Bought Together

- Shelly Pro 3EM Switch Add-On | Add-On Pro 3EM Dry Contacts DIN Rail Mounting | Home Automation | iOS Android app | No Hub Required | Solar Panels | Wind Turbines
- Shelly Pro EM 50A | Wi-Fi & LAN Energy Meter with Contactor Control | DIN-Rail | Home Automation | Bluetooth Gateway | Compatible with Alexa & Google Home | No Hub Required | Power Monitoring
- Shelly H&T Gen3 White | Wi-Fi & Bluetooth Smart Temperature & Humidity Sensor with Remote App Control | Smart Scenes | LCD Display

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hk/products/604996448-shelly-pro-3em-switch-add-on-add-on-pro-3em](https://www.desertcart.hk/products/604996448-shelly-pro-3em-switch-add-on-add-on-pro-3em)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-25*