Best Consumer Unit Blanking Modules: 2025 Expert Review
Oli at OR Electrics
Fully Qualified 18th Edition Electrician
If you look at your consumer unit (fuse box) and see an open gap where a breaker should be, you are looking at a potential C2 failure on an EICR. In plain English: it is potentially dangerous. Those gaps allow dust ingress and, more worryingly, give fingers or tools direct access to live busbars.
For landlords in Leeds, especially those managing student properties or HMOs, these small plastic or metal blanks are non-negotiable. I have carried out countless inspections where a missing 50p blanking plate caused a fail on the certificate. It is a simple fix, but it must be done correctly to maintain the IP (Ingress Protection) rating of the enclosure.
In this review, I will walk you through the solutions I use on the job. We will look at a budget friendly universal strip for quick fixes, proper metal blanks for modern fire-rated boards, and a problem-solving enclosure for when you simply need more space.
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Specs vs. The Real World
The Spec: "'Universal' Fit Claims"
"Many plastic blanking strips claim to fit any consumer unit manufacturers' standard DIN rail cutout."
Whilst the width is standard (17.5mm per module), the clip depth varies. Cheap universal strips often rattle or fall out. It is usually best to buy the brand matching your board, though universal strips can work in a pinch.
The Spec: "Fire Rating Compliance"
"Any blanking module will make the board safe."
Under the 18th Edition wiring regulations, consumer units in domestic dwellings should be non-combustible (metal). Using flimsy plastic blanks on a metal board can technically compromise its fire containment capability. Metal blanks are superior for modern Wylex or Hager metal boards.
My Top 3 Recommendations
Three options to cover different needs and budgets
2 X Consumer Unit - Distribution Board Blanking Strip MCB Blanks (2 Pack)
LKS
These are the bread-and-butter fix for older consumer units. If you have an older plastic MK, Starbreaker, or generic board with a missing breaker, these strips are designed to fill the void cheaply and effectively.
The Good
- Extremely cost-effective
- Can be cut to length (e.g., if you have a 3-module gap)
- Easy to install without opening the cover (usually)
The Bad
- Flimsy compared to manufacturer originals
- Plastic construction not ideal for metal fire-rated boards
- Can be pushed in by inquisitive fingers if not seated perfectly
Installer Tip:
These strips usually snap into the front cover aperture rather than onto the DIN rail itself. Cut the strip one 'notch' longer than the gap requires—the tension will hold it in place much more securely than a loose fit.
Priced at £2.75 at the time of writing
Check Price on AmazonWylex EMB1W Clip In Metal Consumer Unit Blank Insert Pieces (1 Module) - Pack of 10
Wylex
If you have a modern metal Wylex consumer unit (very common in Leeds new builds and rewired terraces), these are essential. Unlike plastic strips, these metal blanks maintain the non-combustible integrity of the enclosure, which is a key requirement of current regulations.
The Good
- Maintains the non-combustible rating of the consumer unit
- Extremely secure fit - will not push in
- Professional finish matches the board perfectly
The Bad
- More expensive than plastic alternatives
- Specific to Wylex boards (may not fit other brands)
Installer Tip:
These clip securely onto the DIN rail or the busbar shield. Ensure the power is OFF before fitting these, as you are working dangerously close to the live busbar when inserting metal components.
Priced at £14.20 at the time of writing
Check Price on AmazonSurface Mounted Consumer Unit 1 Row for 4 Modules
Horoz electric
Sometimes the problem isn't just filling a hole; it is that you have run out of adequate space in your main board to do things safely. This mini enclosure allows you to create a small sub-distribution point—perfect for a garage supply or a specific circuit that doesn't fit the main board.
The Good
- Excellent value for an IP40 enclosure
- Includes DIN rail and spirit level
- Ideal for isolating specific circuits (e.g., shower or garage)
The Bad
- Not a direct blanking module (it is an enclosure)
- Requires wiring knowledge to install correctly
Installer Tip:
Use this when your main consumer unit is full (no spare ways). Instead of cramming wires, feed a supply to this unit mounted adjacent to the main board. It keeps your installation neat, organised, and compliant.
Priced at £6.99 at the time of writing
Check Price on AmazonFrequently Asked Questions
Why are blanking modules necessary for an EICR?
Can I just use electrical tape to cover the gap?
Do I need a specific brand of blanking module?
What is the difference between a blank and a spare way?
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