Why do Surge Protection Devices no longer require an MCB?

Over the last five years, surge protection has become a standard requirement in most electrical installations - but there’s still plenty of confusion around why some devices take up multiple module spaces and need an MCB in-line.

In this video, we take a closer look at Lewden’s latest innovation: a compact, single-module SPD that connects directly to the busbar without needing an MCB. That means more space in your consumer unit for essential circuits - yes, even that Jacuzzi bath you’ve always dreamed of!

We explain how SPDs work, why traditional devices often require an MCB, and how Lewden’s clever design includes built-in fault protection using a simple but effective solder release mechanism. You’ll also get a sneak peek at new additions to Lewden’s consumer unit range for 2025, including:

⚡ Surface-mounted patress
⚡ Upgraded accessory pack
⚡ Optional locking lid
⚡ Black finish variants
⚡ Bi-directional RCBOs for Solar PV installs

Whether you're working on residential upgrades or solar-ready installs, Lewden’s range has you covered.

Check out Lewden’s new consumer unit range here 👉 https://hub.efixx.co.uk/LewdenPro

FREE training module on upgrading consumer units 👉 https://training.efixx.co.uk/course/c...

Got questions about surge protection or anything else in the Lewden range? Drop them in the comments - we’d love to hear your thoughts.

Electrical Safety First - Wiring Regulations Advice on MCBs & Surge Protection Devices
https://www.electricalsafetyfirst.org...

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Time Stamps ⏱
00:00 How SPDs Function
02:15 Why SPDs Traditionally Need an MCB
02:53 Why do SPDs no longer require an MCB?
04:11 Key Points To Remember
05:19 The Market Is Shifting
05:45 Exciting 2025 Products from Lewden
06:40 What Are Your Thoughts?
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#SurgeProtection #ConsumerUnits #ElectricianTips #WiringRegulations