Shelly Pro 3 3-Channel DIN Rail Relay - Professional Automation

In this review the Shelly Pro 3 is presented as a pro-grade DIN rail relay for installers and building managers who need reliable multi-channel control. Its single biggest reason to buy is flexibility: three potential-free channels with both Wi-Fi and LAN connectivity let it handle lighting, motorized valves, and other appliances in residential or commercial electrical panels while fitting neatly on a DIN rail.

Key Features

• Three dry contact channels: Each channel is a potential-free relay, allowing the unit to switch external voltages and control motorized valves or separate lighting circuits without being tied to the relay's supply voltage.
• LAN and Wi-Fi connectivity: Direct Ethernet plus wireless access gives installers options for stable networked control and remote access through the app.
• Up to 48A support: The three-phase, three-channel design supports heavy loads suitable for professional lighting and appliance automation in commercial spaces.
• DIN rail form factor: Built for installation inside breaker boxes, the compact DIN enclosure keeps the device protected and out of sight while integrating into existing electrical distribution.
• Protection features: The Shelly Pro Series adds temperature, overpower, and overvoltage load protection to reduce risk when installed in demanding environments.
• Bluetooth gateway role: Acts as a gateway for Bluetooth devices, improving smart home integration and simplifying device discovery during setup.

Who It's For

The Shelly Pro 3 is ideal for electricians, facility managers, and advanced DIYers who need to automate multiple circuits from inside the distribution board. It suits small commercial sites, apartment common areas, or houses where centralized control of halls, garages, or water distribution valves is required.

Those who should look elsewhere include buyers seeking integrated high-voltage outputs without dry contacts or users needing a consumer plug-and-play single outlet; this device assumes professional installation inside the breaker box and wiring experience.

Pros & Cons

Pros

• Flexible potential-free outputs allow control of different voltages and motorized valves without rewiring the relay supply.
• Ethernet plus Wi-Fi provides stable network options and customers praise the Ethernet port for direct wiring.
• Good build quality and app functionality make setup and ongoing control straightforward.
• Built-in protections help safeguard connected loads in demanding installations.

Cons

• Requires DIN rail installation inside a breaker box, so it is not a plug-and-play consumer device for casual users.
• Advanced features assume familiarity with electrical wiring and network configuration, which may be a barrier for some homeowners.

Specifications

Our Verdict

The Shelly Pro 3 is a solid choice for professionals and advanced users who need reliable, flexible control of multiple circuits from inside the distribution panel. With potential-free channels, Ethernet and Wi-Fi, and built-in protections, it delivers strong value for lighting, motorized valve control, and facility automation when installed by someone comfortable with panel wiring.

Frequently Asked Questions

Can the Shelly Pro 3 control motorized valves?
Yes. The potential-free outputs are suited to control motorized valves in water distribution boxes and HVAC actuator circuits when wired correctly.

Does it support wired network connections?
Yes. The device includes an Ethernet port for LAN connectivity in addition to Wi-Fi.

Is the unit safe to install inside a breaker box?
Yes. The Shelly Pro Series is designed for DIN rail installation and includes temperature, overpower, and overvoltage protections for panel use.