In today’s increasingly complex electrical infrastructure, engineers and installers face a dual challenge: ensuring high-performance surge protection while maintaining flexibility to accommodate changing system requirements. The DEHNguard MD series answers this challenge with an innovative blend of robust protection technology and installation-friendly design. Bringing together Type 2 + 3 surge protection, innovative connection technology, and broad application versatility, DEHNguard MD sets a new benchmark for modern electrical safety solutions.
Innovation at the core: the double-screw connection
At the heart of the DEHNguard MD series lies its most distinctive feature, the innovative double-screw connection. This design enables both stub and feed-through wiring, offering unparalleled flexibility during installation. Conductors of varying sizes can be connected easily, whether using one conductor up to 35 mm² or two conductors up to 16 mm² each. For installers, this means fewer constraints, fewer components, and simpler planning.
Perhaps even more valuable is the feed-through wiring option. By eliminating the need for upstream terminal blocks, the DEHNguard MD series not only saves valuable space inside panels and enclosures but also reduces material and labour costs. This becomes especially advantageous in retrofit scenarios, where available space is limited and system downtimes must be minimised.
Designed for retrofitting and expansion
Modern systems evolve constantly, regardless of the facility type. DEHNguard MD is engineered with these realities in mind. By removing the need for extra wiring accessories, the system frees up space inside switchgear and sub-distribution boards, leaving room for future expansion. This is a critical advantage in settings where additional equipment or extensions to automation networks are expected.
Moreover, the double-screw connection simplifies the retrofitting process, allowing surge protection to be integrated seamlessly into existing installations without extensive redesign. This efficient integration helps reduce overall system costs and installation time – key considerations for operators and system planners alike.
Compliance made simple
Meeting conductor length requirements can be challenging when installing surge protective devices. The DEHNguard MD series addresses this through its feed-through wiring capability, which makes it easy to comply with the standards set out in DIN VDE 0100-534/ IEC 60364-5-53. Installers gain confidence knowing that their installations meet the latest safety and performance regulations while maintaining clean, organised cable routing.
Maintenance made easy
Equipment uptime is essential, and the MD series is designed to support uninterrupted operation. Its pluggable protection modules can be replaced quickly and easily in the event of a fault, minimising downtime and simplifying routine maintenance. The integrated floating remote signalling contact (FM) ensures continuous monitoring of device status, providing critical information to building and system management teams.
A versatile solution for wide-ranging applications
The DEHNguard MD series is built to perform across an impressive spectrum of environments. Whether used in sub-distribution boards, machine control cabinets, industrial process systems, or railway applications, it delivers consistent, reliable protection. The devices are also ideally suited for modern automation systems, supporting stable power distribution in functional and commercial buildings.
Its Type 2 + 3 certification by DEKRA confirms the DEHNguard MD’s ability to protect terminal equipment even with cable lengths up to 10 m, a valuable assurance for installations where sensitive electronics are located downstream.
Product variants for every requirement
To support a wide range of system configurations, the DEHNguard MD portfolio includes multiple variants, such as:
- DEHNguard MD TNS 275: Type 2 + 3 for TN-S systems
- DEHNguard MD TNS 275 FM: with remote signalling contact
- DEHNguard MD TNS ACI 275 FM: Type 2 with ACI technology
- DEHNguard MD TNS 150 FM: Type 2 + 3, lower voltage
- DEHNguard MD TNS 385 FM: Type 2 + 3, higher voltage
- DEHNguard MD TT 275: Type 2 + 3 for TT and TN-S configurations
This variety ensures that designers and installers can select exactly the right device for their electrical system, without compromise.
With the DEHNguard MD series, DEHN delivers a future-ready surge protection solution built around flexibility, efficiency, and safety. Its clever double-screw connection design, simplified installation, and wide range of applications make it a standout choice for both new builds and retrofits. Whether planning for today’s requirements or anticipating tomorrow’s expansions, DEHNguard MD provides the reliable, adaptable protection modern electrical systems demand.
