20A Switch Guide: What It Is, When to Use One & Why It Matters

A 20A Double Pole Switch is designed to safely control fixed appliances that draw more power than a standard lighting circuit but don't require the higher capacity of a cooker switch.

Whether you're upgrading your home's wiring accessories or installing a new appliance, choosing the correct switch ensures safe operation, reliable isolation and compliance with electrical regulations.

What Is a 20A Switch?

A 20A switch is a heavy-duty electrical switch rated to carry up to 20 amps. Unlike a standard light switch, it is intended for controlling larger fixed electrical appliances.

Retrotouch's 20A Switch is a double-pole switch, meaning it isolates both the live and neutral conductors when switched off. This provides complete electrical isolation, making servicing and maintenance safer. Retrotouch models also include a red neon indicator to show when the circuit is energised.

When Should You Use a 20A Switch?

A 20A switch is commonly used where an appliance requires a dedicated isolator but does not need a built-in fuse.

Typical applications include:

• Electric water heaters
• Extractor fans with higher power requirements
• Electric heaters
• Underfloor heating systems
• Air conditioning units
• Other permanently connected fixed appliances

Always follow the appliance manufacturer's installation instructions to confirm the correct type of isolator.

Why Choose a Double Pole Switch?

A double-pole switch disconnects both the live and neutral connections simultaneously.

This provides several benefits:

• Safer isolation during maintenance
• Reduced risk of accidental energisation
• Suitable for permanently connected appliances
• Complies with common installation practices for many fixed electrical loads

For many appliances, a double-pole isolator is recommended instead of a single-pole switch.

20A Switch vs Fused Spur

Although they may look similar, a 20A switch and a fused spur (FCU) serve different purposes.

If an appliance requires a 3A, 5A or 13A fuse, a fused spur is generally the appropriate choice. If circuit protection is already provided by the consumer unit and the appliance simply needs local isolation, a 20A switch is often the better option.

Retrotouch 20A Switch Features

Retrotouch 20A Double Pole Switches are designed to combine functionality with modern aesthetics.

Key features include:

• 20A double-pole switching
• Red neon power indicator
• 230V AC, 50Hz rating
• IP20 protection
• Earth terminal included
• Terminal capacity up to 2 × 6mm² conductors
• Fits a standard 35mm back box
• Manufactured with a premium milled aluminium frame
• Available in contemporary finishes including Matt Black, Brushed Brass, Brushed Bronze and Brushed Nickel and Crystal Glass Black/White.
• Backed by a 10-year warranty

Installation Considerations

Before installing a 20A switch:

• Isolate the electrical supply at the consumer unit.
• Confirm the appliance load does not exceed the switch's rating.
• Use the recommended back box depth.
• Ensure wiring complies with the latest edition of BS 7671 (IET Wiring Regulations).
• Installation should be carried out by a qualified electrician where required.

Frequently Asked Questions

Can a 20A switch be used for a cooker?

Generally, no. Most electric cookers and hobs require a 45A cooker switch due to their higher electrical load.

Does a 20A switch contain a fuse?

No. A 20A double-pole switch provides isolation only. If fused protection is required, install a fused connection unit (FCU) where specified.

What appliances use a 20A switch?

Common examples include electric water heaters, underfloor heating, air conditioning units, electric heaters and other medium-power fixed appliances.

Why does the switch have a neon indicator?

The integrated red neon provides a visual indication that the circuit is switched on and energised, making it easier to identify when power is supplied to the connected appliance.

Why Choose a Retrotouch 20A Switch?

Retrotouch combines robust electrical performance with premium decorative finishes, making its 20A Double Pole Switches ideal for both modern homes and commercial interiors.

With complete double pole isolation, straightforward installation, and stylish aluminium faceplates, Retrotouch 20A switches offer a practical solution for safely controlling medium-power fixed appliances while complementing contemporary décor.

Need Help?