V NH / VA NH
Surge Arrester in NH Design
- Surge arrester for use in NH 00 and 1 fuse holders
- Zinc oxide varistor with monitoring device, disconnector and integrated backup fuse (VA NH... with additional spark gap connected in series)
- Energy coordination with other arresters of the Red/Line product family
- Fault indication by tripping indicator
Version
V(A) NH00 280: Surge arrester for use in NH00 fuse holders
V(A) NH1 280: Surge arrester for use in NH1 fuse holders
V(A) NH00 280 FM: With fault indicator for remote signalling; allows for use of NH fuse holders with microswitch (max. tripping distance of indicator of 7 mm)
V(A) NH1 280: Surge arrester for use in NH1 fuse holders
V(A) NH00 280 FM: With fault indicator for remote signalling; allows for use of NH fuse holders with microswitch (max. tripping distance of indicator of 7 mm)
Details
The single-pole V NH and VA NH surge arresters show that surge protective devices do not necessarily have to be designed for DIN rails or socket outlets. Adapted to the requirements in industrial sub-circuit distribution boards, V NH and VA NH surge arresters are designed in the form of an NH fuse holder. This allows to easily integrate them into busbar systems which are frequently used in the environment of utility operators or in industrial plants. Thus, these surge protective devices offer all the advantages of busbar systems such as easy installation, low installation time and reduced wiring. The idea of such a busbar system is consistently continued with arresters in NH design. V NH and VA NH surge arresters can be installed and removed by means of a fuse switch-disconnector and a fuse handle. This considerably facilitates insulation measurements in the installation as the arrester does not have to be disconnected any more.
Another considerable advantage of the V NH / VA NH family is that a backup fuse is already integrated in the arrester. In case of earth-fault and short-circuit-proof wiring, this considerably saves costs and reduces space requirements in distribution boards. In case of the VA NH version, a spark gap is connected in series with the heavy-duty zinc oxide varistor with thermal monitoring and disconnection device of the V NH surge arresters. VA NH devices are used to reliably protect large-scale systems with permanent insulation monitoring. Apart from the standard visual indication by a tripping indicator, V(A) NH ... FM surge arresters feature a microswitch integrated in the NH fuse holder for remote signalling.
Another considerable advantage of the V NH / VA NH family is that a backup fuse is already integrated in the arrester. In case of earth-fault and short-circuit-proof wiring, this considerably saves costs and reduces space requirements in distribution boards. In case of the VA NH version, a spark gap is connected in series with the heavy-duty zinc oxide varistor with thermal monitoring and disconnection device of the V NH surge arresters. VA NH devices are used to reliably protect large-scale systems with permanent insulation monitoring. Apart from the standard visual indication by a tripping indicator, V(A) NH ... FM surge arresters feature a microswitch integrated in the NH fuse holder for remote signalling.
