Dehn Africa, has launched DEHNguard SE DC, a modular type 2 surge arrester that is designed so that the protective device is safely disconnected in case of overload, thus preventing DC switching arcs and fire damage. Depending on the voltage level, DEHNguard SE DC can even be used without an additional backup fuse for direct currents up to 300 A. It is ideally suited for use in safety lighting systems, emergency power supply systems, DC systems for direct supply of DC drives, control circuits, and any kind of battery-operated supply systems.
The arrester provides a high degree of safety and comfort, thanks to its modular design, and incorporates the unique vibration-proof module locking system of the latest Red/Line design.
The mechanical operating state/fault indication immediately indicates the state of the device. It is combined with the proven thermal disconnector for varistors which is connected to the additional DC switching device. As is also the case with the DEHNguard product series for AC systems, the protected installation is not disconnected from the supply voltage as soon as the disconnector trips, thus ensuring a reliable power supply to the installation. These new DC arresters were tested based on the requirements for type 2 arresters according to EN 61643-11 and IEC 61643-1/11.
Thanks to voltage ratings of 60 VDC, 242 VDC, 550 VDC and 900 VDC, DEHNguard SE DC is ideally adapted to the different technical fields of application of DC systems such as:
• Safety lighting systems, emergency supply systems: DG SE DC 242 (FM) has been developed for protecting safety lighting and emergency supply systems. The device can be used up to a maximum DC voltage of 242 V and up to a maximum AC voltage of 253 V (in case of a maximum backup fuse of 10 A gG), which are typically used in this environment. It safely protects the control systems and illuminants from the effects of surges.
• Data centres: DG SE DC 550 (FM) covers a voltage range used to operate data centres, which are generally directly supplied with 380 VDC. It ensures that sensitive systems are protected in case of surges and effectively ensures the reliable supply and availability of a data centre.
• Charging stations for electric vehicles: Fast charging stations for electric vehicles are directly operated with DC voltages from 400 VDC to a maximum 850 VDC to provide energy for the short charging cycles. DG SE DC 900 (FM) is designed in such a way that it can be ideally used for such applications.
• DC drives of railway systems: Typically, city and underground railways are supplied with a traction voltage of 750 VDC, making the DG SE DC 900 (FM) an ideally adapted surge protective device for rectifier units and drives. It safely protects traction power supply systems, which are an integral part of the infrastructure of public transport, against surges caused by indirect lightning strikes or switching operations.
• Cell sites (remote radio heads): Active antennas (remote radio heads) are supplied with a nominal voltage of 48 VDC. The DG SE DC 60 (FM) is optimally adapted to this field of application and protects voltage supply systems and antennas against surges.
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