What’s Changed and What Installers Need to Know
Table of Contents
This Hager single module SPD update marks an important shift in how surge protection is designed, engineered, and supplied for Hager consumer units. Surge protection in domestic electrical installations has evolved rapidly over the last decade, particularly since the introduction of the 18th Edition of BS 7671, which made SPDs an expected part of most new consumer unit installations rather than a site-specific add-on.
What was once treated as an optional or risk-based decision is now a core element of modern board design. As a result, surge protective devices are no longer judged purely on compliance, but also on how efficiently they use space, how they are protected internally, and how easily they can be installed and maintained within increasingly crowded consumer units.
One of the clearest industry trends to emerge from this shift has been the move towards single-module Type 2 SPDs. This update confirms that Hager has now fully joined that trend.
Background to the Hager single module SPD update
For many years, surge protection in a Hager consumer unit meant fitting a dedicated 2-module Type 2 SPD, typically positioned next to the main switch. From a regulatory and engineering perspective, this approach was solid and deliberately conservative.
It offered:
- Full compliance with BS 7671
- Predictable thermal and fault behaviour
- Clear separation of protective functions
- No reliance on upstream devices for overcurrent protection
- A familiar installation method for electricians
At a time when some manufacturers introduced compact SPDs that relied on coordination with upstream MCBs or fuses, Hager chose to prioritise self-contained protection and internal safety margins.
However, as consumer units evolved, the limitations of this approach became more apparent.
Why the industry moved to single-module SPDs
Modern consumer units are under constant pressure to accommodate more devices in less space. Today’s boards commonly include RCBOs as standard, AFDDs where required, metering and monitoring equipment, control modules for EV charging or PV systems, and spare ways for future expansion.
In that context, a 2-module SPD can:
- Reduce usable outgoing ways
- Force compromises in circuit layout
- Push installers towards larger enclosures than necessary
- Increase congestion and installation time
Single-module SPDs address these issues directly. They deliver the same level of Type 2 surge protection while freeing up valuable space inside the board. Importantly, this reduction in size does not imply reduced protection — provided the internal design supports it.
This broader industry movement sets the context for the Hager single module SPD update.
What changed in this Hager single module SPD update
Hager has now introduced a single-module Type 2 SPD designed specifically for use in its consumer units. This is not a cosmetic redesign; it reflects genuine internal development and consolidation of protective components.
Following a direct technical enquiry to Hager, their explanation was clear:
“We have condensed our type 2 single phase and neutral surge into one module to allow for quicker and easier installation.”
Advances in internal component integration have allowed Hager to combine what was previously housed across two DIN modules into a single compact device — without compromising function or compliance.
This is the core engineering change behind the Hager single module SPD update.
Internal protection and safety design clarified
A key concern with compact SPDs is how they handle thermal and overcurrent protection, particularly where other manufacturers have relied on upstream protective devices.
This question was put directly to Hager.
Does the new single-module SPD include internal protection, or does it rely on upstream coordination?
Hager’s response:
“Yes, all of our devices have integral fusing therefore, does not require additional overcurrent protection upstream to protect it.”
This confirms that the new SPD:
- Includes integral internal fusing
- Does not require an upstream MCB or fuse
- Does not rely on external protective coordination
- Is fully compliant when installed in accordance with Hager instructions
This aligns with Hager’s long-standing design philosophy: surge protection should be self-contained, predictable, and independent of installer-selected upstream devices.
Why Hager stayed with a 2-module SPD for so long
When other brands introduced single-module SPDs — often paired with an MCB — Hager continued with a dedicated 2-module solution. This decision was driven by engineering caution rather than reluctance to innovate.
Earlier compact designs often achieved size reduction by outsourcing protection to external devices. Hager’s approach prioritised:
- Integrated thermal management
- Internal fault handling
- Predictable disconnection behaviour
- Independence from upstream protection choices
The new single-module SPD represents the point at which Hager was satisfied that all protective functions could be fully integrated internally. In that sense, this update reflects engineering maturity rather than market pressure.
Product overview – what the new SPD offers
As part of this Hager single module SPD update, the new device offers:
- Type 2 (Class II) surge protection
- Full compliance with BS 7671 (18th Edition)
- Design specifically for Hager consumer units
- Pluggable cartridge for ease of replacement
- Optical status indication (green = healthy, red = replace)
- Integral internal fusing
- No requirement for external back-up protection
You can view the product here:
👉 Hager VMES02SPD single-module consumer unit surge protector
Manufacturer technical details are available here:
👉 Hager VMES02SPD Type 2 SPD product information
January availability – what we know so far
A key part of this Hager single module SPD update is when the new SPD will be supplied as part of consumer unit kits rather than as a separate item.
After speaking directly with Hager, the current position is:
👉 The single-module SPD is expected to be added to Hager consumer unit kits at some point during January.
Important caveats:
- No exact date has been confirmed
- It may not be from the beginning of January
- Stock transition is likely to be phased
Installers should avoid assuming that all consumer units supplied in early January will automatically include the new SPD.
What installers should do in the meantime
Until updated consumer units begin consistently arriving with the new SPD included, the recommended approach is simple.
If you want to use the single-module SPD right now:
- Install a Hager main switch consumer unit
- Add the single-module SPD separately
- Build the board as normal
You can view current options here:
👉 Hager consumer units for domestic installations
FAQs – Hager single module SPD update
The following FAQs address the most common installer questions raised since this Hager single module SPD update was announced.
Is the new SPD compliant with BS 7671?
Yes. It is a fully compliant Type 2 (Class II) SPD.
Does it offer the same protection as the old 2-module SPD?
Yes. Performance is unchanged. The size reduction comes from internal integration, not compromise.
Does it require an upstream MCB or fuse?
No. Hager has confirmed that the SPD includes integral internal fusing.
Why didn’t Hager do this earlier?
Earlier designs prioritised conservative, self-contained protection. The new SPD reflects advances that allow this within a single module.
When will all Hager consumer units include it?
At some point during January. Exact timing is still to be confirmed.
Key takeaways from the Hager single module SPD update
- Hager has transitioned to a single-module Type 2 SPD
- Internal protection is fully integrated
- No external back-up protection is required
- Consumer units are expected to transition during January
- Until then, main switch boards plus a separate SPD remain the solution
Looking beyond Hager
While this Hager single module SPD update focuses on one manufacturer, Hager consumer units are just one of many brands we supply.
To compare specifications, layouts, and pricing across multiple manufacturers, visit:
👉 Consumer units from multiple manufacturers
About Electrical4Less Ltd
Electrical4Less Ltd is a UK-based electrical wholesaler and an authorised distributor of Hager products, supplying electricians and contractors nationwide.
We are based in South West London at:
Electrical4Less Ltd
9 Seagrave Road
Fulham
London
SW6 1RP
Browse our full range at:
👉 Electrical4Less – UK electrical wholesaler
Final thoughts
This Hager single module SPD update reflects a clear shift in Hager’s approach to surge protection, balancing compact design with fully integrated internal protection. It brings Hager consumer units in line with modern installation practices while maintaining the conservative engineering principles the brand is known for.
Cleaner boards. Better use of space. No compromise on safety.
Hager Single Module SPD Update for Consumer Units Explained