Can I Add a UK 3-Pin Plug to a Somfy RTS Motor?

When installing Somfy motorised blinds, one of the most common questions we receive at Newblinds.co.uk is whether you can add a standard UK 3-pin plug to the motor. The answer depends on which type of Somfy RTS (Radio Technology Somfy) motor you have.

Understanding the Two Types of Somfy RTS Motors

Somfy RTS motors come in two main power configurations, each with different plug requirements:

12V DC Battery-Powered Motors

Battery-powered Somfy RTS motors typically operate on 12V DC power and are designed with convenience in mind. These motors can easily accommodate plug-in power supplies, where one end connects directly to the motor and the other features a standard UK 3-pin plug that slots into your wall socket. This makes installation straightforward and eliminates the need for any hardwiring or professional electrical work.

230V AC Mains-Powered Motors (Sonesse 40 RTS)

Mains-powered options, most commonly the Somfy Sonesse 40 RTS, operate on 230V AC and come with a two-core cable. This is where the question of adding a UK 3-pin plug becomes more relevant and requires careful consideration.

Why Does the Sonesse 40 RTS Have Only Two Cores?

The Somfy Sonesse 40 RTS tubular motor is classified as Class II electrical equipment, meaning it features double insulation and does not require an earth wire for safe operation. The two-core cable contains:

• Brown wire – Active (Live) connection
• Blue wire – Neutral connection

This two-core configuration simplifies installation compared to motors that require earthing. The Class II double insulation design provides the necessary protection without needing a third earth wire, which is why you'll only find two insulated conductor cores in the cable.

For context, other Somfy motors like the Sonesse 40 WT (Wired Technology) version typically have three or more cores, including separate wires for up and down directional control, but the RTS version's simpler two-core design is perfectly safe and compliant with UK electrical standards.

Can You Add a UK 3-Pin Plug to a Sonesse 40 RTS Motor?

Yes, you can safely wire a standard UK 3-pin plug to a Sonesse 40 RTS motor's two-core cable. Here's what you need to know:

Why a 3-Pin Plug is Required

While the motor only has two cores and doesn't need earthing, UK wall sockets are designed with safety shutters that only open when the earth pin of a 3-pin plug is inserted. This means a 2-pin European-style plug cannot be used directly in UK sockets, making the 3-pin plug necessary for physical compatibility with UK electrical outlets.

How to Wire the Plug Correctly

When connecting a UK 3-pin plug to your Sonesse 40 RTS motor cable:

1. Live connection (L) – Connect the brown wire to the Live terminal, typically positioned on the right side of the plug and marked with 'L' or coloured brown
2. Neutral connection (N) – Connect the blue wire to the Neutral terminal, usually on the left side and marked with 'N' or coloured blue
3. Earth terminal (E) – Leave the earth terminal (the top pin, marked 'E' or with green/yellow colour) empty, but ensure the terminal screw is tightened for safety
4. Fuse rating – Use an appropriate fuse, typically 3A for low-power appliances like blind motors
5. Cable grip – Ensure the cable clamp securely holds the outer sheath of the cable to prevent strain on the internal connections

Important Safety Considerations

While wiring a plug to a Class II double-insulated motor is straightforward, we strongly recommend that all electrical connections be made by a qualified electrician to ensure compliance with UK wiring regulations (BS 7671) and for your safety. Incorrect wiring can pose fire and electrical shock hazards.

Professional Installation Recommended

At Newblinds.co.uk, we always prioritise customer safety. Even though the Sonesse 40 RTS motor is designed to be safe without earthing, proper installation is essential. If you're not confident working with mains electricity, please consult a qualified professional electrician who can ensure your installation meets all UK electrical safety standards.

Summary

Adding a UK 3-pin plug to your Somfy RTS motor is possible and safe when done correctly:

• 12V DC battery-powered motors – These typically come with plug-in power supplies already fitted with UK 3-pin plugs
• 230V AC Sonesse 40 RTS motors – Can have a UK 3-pin plug wired to their two-core cable, with the brown wire connected to Live, blue to Neutral, and the earth terminal left empty but secured

For advice on motorising your blinds or to discuss which Somfy RTS motor is right for your project, contact the team at Newblinds.co.uk. We're here to help you create the perfect automated window covering solution for your home.

This article provides general guidance only. Always consult a qualified electrician for electrical installation work. Newblinds.co.uk accepts no liability for installations carried out based on this information.