# Shelly Pro 3EM Galvanically Isolated Smart Switch Add-On

- Canonical URL: https://www.netxl.com/energy-management/shelly-pro-3em-switch-add-on/
- Brand: Shelly
- SKU / part number: SHELLY-PRO-3EM-SWITCH-ADD-ON
- EAN (GTIN-13): 3800235268131
- Category: Energy Management (https://www.netxl.com/energy-management/)

## Pricing (GBP, guest pricing — trade customers see account pricing via the API)
| Quantity | ex VAT | inc VAT |
| --- | --- | --- |
| 1+ | £23.61 | £28.33 |
| 5+ | £23.61 | £28.33 |
| 10+ | £23.61 | £28.33 |

## Availability and shipping
- Availability: 20 in stock
- Shipping: Royal Mail Tracked - Next Working Day — £7.19, 1 working day(s)

## Description

The Shelly Pro 3EM Switch Add-On is designed to expand the capabilities of your Shelly Pro 3EM devices, allowing you to control contactors and other electrical devices for greater flexibility and monitoring. The Shelly Pro Add-On can monitor the power generation of solar panels and wind turbines, as well as automatically switching off non-essential appliances to save energy.

Designed to be mounted on the DIN rail in the breaker box, the Shelly Pro 3EM Switch Add-on offers even greater functionality than the Shelly Pro 3EM devices by offering features like weather-driven energy optimisation like disabling the heating on sunny days, anticipating higher temperatures.
The Pro 3EM Switch Add-On can also help balance your PV systems load, such as redirecting excess produced energy into other appliances like water heaters, charging stations for electric vehicles and other energy-intensive appliances to reduce your dependence on the grid.
The Pro 3EM Switch Add-on features dry contacts and is DIN-rail mountable.
***Please note: The Pro 3EM Switch Add-On is only compatible with the Shelly Pro 3EM.

## What's in the box

- 1 x SHELLY-PRO-3EM-SWITCH-ADD-ON
- 1 x Installation Guide

## Specifications

| Specification | Value |
| --- | --- |
| Power Supply | 240V |
| Connectivity | WiFi |
| Purpose | Energy Monitoring |
| Product Series | Pro |

## Documents

- [Shelly Pro 3EM Add-On User Manual](https://www.netxl.com/shelly/docs/shelly-pro-3em-add-on-user-manual.pdf)

## Programmatic access

- This page in HTML: append a trailing slash instead of `.md`
- NetXL Customer API (real-time customer pricing, stock, ordering): https://api.netxl.com — OpenAPI at https://api.netxl.com/openapi.yaml
- MCP server for AI agents: https://mcp.netxl.com
- Machine-readable site index: https://www.netxl.com/llms.txt
- API documentation: https://www.netxl.com/api-docs.md