SPD Consumer Units
SPD consumer units protect electrical installations from damage caused by transient voltage spikes. Built to meet 18th Edition wiring regulations, they combine overcurrent protection with a built-in surge protection device, making them a smart choice for both new installations and consumer unit upgrades.
At CM Electrical, we stock a range of SPD consumer units from BG Electrical and Whitecliffe. These units include Type 2 SPDs with 32A MCBs and are available in main switch or dual RCD formats. Whether you need a populated unit ready to install or an empty board to configure yourself, we have options that make compliance easy.
What Are SPD Consumer Units Used For?
SPD consumer units are fitted in domestic properties to help protect appliances and circuits from sudden voltage spikes caused by:
● Lightning strikes nearby
● Power grid switching
● Large electrical equipment switching on or off
Without protection, these surges can damage electronics, trip circuits and shorten the lifespan of appliances.
Features of Our SPD Consumer Units
We supply SPD boards from BG Electrical and Whitecliffe, offering:
● Built-in Type 2 surge protection with 32A MCB
● 100A main switch or dual RCD configurations
● 6, 10 or 12 usable ways depending on your setup
● Populated and unpopulated versions
● Supplied with busbar, earth and neutral terminals
● Easy cable entry points and clear labelling
● Fully compliant with 18th Edition regulations
All units are made to a high standard, designed for fast installation and reliable long-term use.
Choosing the Right SPD Unit
When selecting an SPD consumer unit, check:
● Number of circuits you need to install
● Whether you prefer a main switch with RCBOs or a dual RCD setup
● If you want a fully populated board or plan to add your own breakers
● Available installation space and cable routing
● Whether your project requires surge protection under the current regulations
Our listings include full technical specs, datasheets and images to help you pick the right unit for your job.
Why Buy from CM Electrical?
● We stock trusted brands: BG Electrical and Whitecliffe
● All units are 18th Edition compliant
● Competitive pricing for trade and residential customers
● Fast dispatch and UK-wide delivery
● Clear product details and support from experienced staff
FAQs
What is an SPD consumer unit?
It is a consumer unit that includes a built-in surge protection device to help protect your circuits and connected equipment from voltage spikes.
Do I need an SPD in a domestic installation?
The 18th Edition recommends surge protection where overvoltages could cause damage or safety risks. Many new installations now include SPD as standard.
What’s the difference between a main switch and a dual RCD unit?
Main switch boards offer flexibility when using RCBOs for each circuit. Dual RCD boards group circuits under two RCDs, helping keep costs down.
Can I add an SPD to a unit later?
Yes, but choosing a board with an integrated SPD saves time and ensures everything is correctly rated and installed in one go.
Which brands of SPD boards do you stock?
We currently offer SPD consumer units from BG Electrical and Whitecliffe, both known for solid build quality and reliable performance.