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Surge Protection for Power Supply Systems

Our Red/Line surge protection portfolio includes solutions for protecting systems up to 1,000 V a.c. / 1,500 V d.c. against surges caused by atmospheric discharge and switching operations.

Type 1 Nema 4X SPD

DEHNguard EZ: Type 1 surge protection devices offering superior performance in a NEMA 4X enclosure. These serviceable SPDs come prewired for easy installation, combining robust protection with user-friendly features.

Type 1 + Type 2 Combined Lightning Current and Surge Arresters

Spark-gap-based type 1 + type 2 combined arresters - DEHNventil, DEHNvenCI, DEHNshield, DEHNcombo - combine lightning equipotential bonding and protection of terminal equipment in a single arrester.

Coordinated Type 1 Lightning Current Arresters

Thanks to their high efficiency, coordinated spark-gap-based type 1 lightning current arresters are ideally suited for installation in the main distribution board of low-voltage consumer’s installations.

Type 1 Lightning Current Arresters

Type 1 lightning current arresters ensure lightning equipotential bonding in electrical installations and allow a compact configuration of low-voltage main distribution boards.

Accessory for Type 1 Arresters

Receiver modules for optical transmission for selective operating state indication / centralised fault indication of three coordinated DEHNbloc Maxi S / DEHNgap Maxi S lightning current arresters.

N-PE Lightning Current Arresters

Spark-gap-based type 1 N-PE lightning current arresters of type DEHNgap are installed in “3+1” or “1+1“ circuits of TT or TN systems between neutral conductor N and protective conductor PE.

Type 2 Surge Arresters

The DEHNguard SU/MU product family is applicable for all common North American electrical power systems. The Surge Protective Devices (SPDs) are UL 1449 4rd Ed. Approved with a 200 kA SCCR rating and do not need any additional overcurrent protection.

Type 3 Surge Arresters

Type 3 arresters are typically used for protecting terminal equipment. Different types of enclosures allow easy installation close to terminal equipment.

General accessories

Adequate accessories such as terminals, insulating enclosures or busbars make it easier to install and monitor DEHN surge protective devices in many applications.

Measuring and test equipment

Monitoring devices for potential-free registration of the discharge currents of protective devices and for testing the sparkover voltage of surge arresters.

Isolating spark gaps

Isolating spark gaps for aboveground and underground installation are used to indirectly earth and connect functionally isolated parts of installations under lightning conditions.

DC decoupler

DC decoupler for protection in case of transient, temporary and long-duration overvoltages caused by external voltages from various sources of interference (e.g. high-voltage systems, traction power supply systems, low-voltage systems, lightning interference).

SDS

The function of voltage-limiting devices in railway systems is to permanently connect parts in the overhead contact line and pantograph zone to the return circuit as soon as the sparkover voltage is exceeded.

Medium-voltage arrester

Medium-voltage arrester for protecting transformers, switchgear installations and transmission lines against surges. Directly mounted on the mast, point of transition between the overhead line and the cable or transformer.

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