Dehn Dehnguard Modular

Featuring the functional Red/Line family design, the modular DEHNguard M surge arresters set new standards in terms of safety and ease of use. The proven protective circuit with heavy-duty zinc oxide varistors in combination with the dual "Thermo Dynamic Control" monitoring device are characteristic of the DEHNguard technology.

A variety of features show that both reliable surge protection and equipment safety are key elements of the modular DEHNguard surge arresters. The application-based product designation, which makes it considerably easier to choose the correct device for the relevant application and the unique module locking system both reflect the most stringent safety requirements.

The module locking system firmly fixes the protection modules to the base part. Neither vibration during transport nor the enormous forces of discharge can loosen the protection modules.

Nevertheless, they can be easily replaced without tools by simply pressing the easy-to use module release button of the protection modules. Each protective circuit of the multipole surge arresters and each protection module are mechanically coded to guard against installing an incorrect module.

Key Features

• Prewired complete unit consisting of a base part and plug-in protection modules
• Energy coordination with other arresters of the Red/Line product family
• High discharge capacity due to heavy-duty zinc oxide varistors / spark gaps
• High reliability due to "Thermo Dynamic Control" SPD monitoring device
• Easy replacement of protection modules without tools due to module locking system with module release button
• Vibration and shock-tested according to EN 60068-2

The dual "Thermo Dynamic Control" monitoring device was not only developed on the basis of national and international product standards, but also reflects decades of experience in the world market of surge protective devices and considers many practical applications where arresters might be damaged. As with all DEHN surge arresters with "Thermo Dynamic Control", the surface temperature of the heavy-duty varistor and the intensity of the discharge current are used for evaluation. The visual indicator with green and red indicator flags shows the availability of every protective circuit. Apart from this standard visual indication, DEHNguard M ... FM devices feature a three-pole remote signalling terminal.

As the remote signalling contact is designed as a floating changeover contact, the remote signal can, depending on the circuit concept, be used as a make or break contact. The surge arresters of the modular multipole DEHNguard M family feature multifunctional terminals on a standardised spacing of 1 module for the connection of conductors and busbars, allowing easy wiring with other DIN rail mounted devices. The STAK 25 pin-shaped terminal, which is compatible with all DEHNguard modules, allows optimal "V-connection" according to IEC 60364-5-53.

The DEHNguard M H TT … type already meets the requirements of the new VDE 0100-534 standard (Table: Discharge values In in a 3+1 configuration for three-phase systems with increased safety requirements). This standard requires at least 40 kA for the N-PE path. Since it was technically possible to implement a discharge capacity of 80 kA here, even an arithmetically correct design (4 x 20 kA = 80 kA) in combination with standard varistor modules with In = 20 kA was implemented.

Specifications