DEHN + SOHNE DEHNshield surge arresters

The DEHNshield surge arresters, the latest addition to DEHN’s portfolio, have a discharge capacity up to 50 kA (10/350 μs).

The arresters can be easily integrated into existing distribution boards. They are, therefore, suitable for use in existing buildings without external lightning protection system, where roof superstructures such as antennas and overhead line supplies are installed or in buildings with an external lightning protection system. The arresters offer various benefits provided by spark-gap-based Class I type surge arresters such as the wave breaker function. This function describes the voltage-switching characteristic of a spark gap and reduces the surge energy to an acceptable level for downstream protection or terminal devices.

If coordinated with downstream type 2 or 3 arresters or terminal devices, the spark gap technology of DEHNshield provides considerable advantages for its field of application. It is directly energy-coordinated with other arresters in the DEHN Red/Line product family.

If installed at a distance of within 5 m from a terminal device, the arrester provides protection for the terminal device. DEHNshield combines lightning equipotential bonding and surge protection in a single arrester. This is said to distinguish the DEHNshield from other varistor-based Class I type arresters where coordination with downstream varistor-based secondary or terminal device arresters is difficult if not impossible.

Spark gap technology ensures selectivity even in case of low-current rated fuses. This means that upstream fuses will not trip due to 50 Hz mains follow currents. Each pole is equipped with a status/fault indication which provides real-time information on the availability of the arrester even if no operating current is present.