The Wylex NMDRS20SSLHIA 20 Way High Integrity Duplex Consumer Unit is engineered for demanding domestic and light commercial electrical systems. With 20 usable ways, a 100A main switch, and dual 80A 30mA Type A RCDs, this consumer unit is designed to safely manage complex circuit layouts while maintaining compliance and performance. Its duplex layout provides clear separation of essential and non-essential circuits—ideal for powering everything from lighting and kitchen appliances to EV chargers and office equipment.
This 20 way high integrity fuse board allows you to assign critical circuits to RCBOs for uninterrupted power, while non-essential loads are split across the two RCD banks. This level of flexibility is essential for modern installations requiring selective disconnection during faults. Whether you're future-proofing a home or meeting the requirements of the latest wiring regulations, the NMDRS20SSLHIA offers the ideal layout for safe, smart power distribution.
Featuring a durable metal-clad enclosure that complies with Amendment 3 and BS EN 61439-3, this board ensures full regulatory compliance. The NMDRS20SSLHIA also offers plenty of space for tidy cable routing, with labelled terminals and pre-formed knockouts for faster, neater installations. Trusted by electrical professionals across the UK, Wylex continues to lead in innovation, safety, and ease of installation.
Almost all orders placed before 1.00pm (Monday-Friday) will be despatched the same day, (providing we have the items in stock).
We offer the following delivery options:
For orders under £50, please see the following delivery tariffs. Please note that some delivery locations / times (see below) will incur additional charges.
We are also able to offer the following timed deliveries.
Delivery Locations Incurring Extra Charges for signed for deliveries.
The following locations will incur additional charges if you select a signed for delivery (or for large items which require delivery by courier):
If you have any specific delivery requirements, call our sales team on 01793 863409.
Our aim is to provide you with the highest levels of service possible and this extends to our flexible and customer-friendly policies.
Please do not return any items to Heathfield LED without first contacting us by phone or email.
phone: 01793 863409 (9am to 5pm Monday to Friday)
email : returns@heathfieldled.co.uk
If you wish to return goods for any reason please supply the following information:-
We will do everything possible to comply with reasonable requests for returns and will issue any refund due to you as promptly as possible.
If you have any concerns or questions please call or e-mail us!
What doesn’t our warranty cover?
In any instance where your bulb has developed a fault, we will do our utmost to replace it or offer a full refund (provided the item is still within its stated warranty period). However, if it becomes apparent that the product has been misused, tampered with or modified in any way, we will view this as having voided its warranty.
‘Misuse” includes, but is not limited to, incorrect operation by the user, use of non-dimmable bulbs on a dimmable circuit or connection to or operation with an unsuitable power supply. ‘Tampering’ or ‘modification’ can be interpreted as any activity designed to alter the product in such a way that it can be used in a manner that wasn’t intended by its original design. This can include rewiring, removing plugs, home repairs or changing components. Unfortunately, we won’t be able to replace any item that has undergone any such process.
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