Combined current and overvoltage arrester

November 2004 Electrical Power & Protection Products & Solutions Smart Home Automation

The DEHNventil TT is a combined Class I lightning current arrester and Class II overvoltage arrester providing the same level of protection where previously up to 20 devices had to be installed and connected. The compact unit requires only 30% of the space of similar devices and no de-coupling inductance coils are necessary between the Class I and Class II arresters.

Easily installed in different types of power supply systems, DEHNventil TT makes calculations unnecessary. Its discharge capability meets protection level 1 in accordance with SABS, IEC, EN and VDE standards, the highest requirements of lightning protection at present. It is capable of protecting equipment, even in the case of a lightning strike with an intensity of 200 kA (10/350).

By using the encapsulated spark gap technology, safety distances to adjacent components within the distribution cabinet are unnecessary. Even at fault currents up to 25 kARMS a 35 A fuse will not trip when DEHNventil TT extinguishes the follow on current.

The combined current and overvoltage arrester has no leakage current. This allows direct use of the device upstream of the meter, and when testing the insulation, no disconnection is required. DEHNventil TT is compatible with other surge arresters in the DEHN RED/LINE family.

By using the twin terminals, connection is easy and inductive volt drop across long connection cables is avoided. An additional bus bar terminal at the output increases the combination possibilities with other DIN rail mounted components. LED indication is provided, or if required, the optional DEHNsignal DV remote monitoring module informs the user on the state of the protection, even when he is not on site.

All DEHNventil devices have an additional earth terminal. This allows a safe connection to the main earth bar as well as short connection to the protective earth conductor of the power supply system.

For more information contact Paul Van As, Surge Technology, 011 792 1303, info@surgetek.co.za, www.surgetek.co.za

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