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modules set by the manufacturer characterise the maximum safety of the devices. Damage due to incorrect supply by the installer or user is unlikely. The Thermo Dynamic Control disconnector is integrated into every DEHNguard surge arrester and ensures that the SPD changes to an isolated state not only in case of a “standard” overload. It also remains safe in case of significant exceeding of the parameters of the SPD. Therefore, the Thermo Dynamic Cont

Whether single-pole or multipole, compact or pluggable, with or without remote signalling - the DEHNguard family provides the appropriate surge protection for every type of installation. Apart from devices for universal application, many application- specific protective circuits, e.g. for photovoltaic installations, can be provided. The product ranges from 75 V units to rated voltages of 1200 V for a.c. and d.c. applications. The DEHNguard ® M YPV S

Already for many years DEHN + SÖHNE has been using powerful ZnO varistors with a nominal discharge capacity of 20 kA (8/20 μs). The protective element must endure this load at least 20 times without destruction and change in If this discharge capacity is exceeded due to unfavourable conditions, e.g. due to a lacking upstream spark-gap-based lightning current arrester, and the varistor is therefore overloaded, it must automatically be disconnected fro

Surge Arresters installed into Distribution Boards

arresters are used here.

performance.

Lightning Protection Zone 1/2
275 10 3 10 2 10 1 10 0
10 -1 100 10 -2 10 -3 10 -4 10 -5 U/I characteristic of a varistor
Surge arresters installed into distribution boards have a central function especially in expansive electrical installations, such as office buildings. Being the second protective stage in the protection concept, they also connect the lightning current arrester in the main distribution board of the building to protection of the terminal device. The resulting relations to the different arrester technologies have especially to be taken into consideratio
275
600
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U (V)
2000
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