New Products

Type 2 Surge Arresters
• Surge arrester for use in size 00 and 1 NH 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
V NH / VA NH
Surge arrester in NH design
For protecting low voltage consumer’s installations against surges. For
installation in conformity with the lightning protection zones concept at
the boundaries from 0 B – 1 and higher. German patented design.
V(A) NH00 280:
V(A) NH1 280:
V(A) NH00 280 FM:
Surge arrester for use in size 00 NH fuse holders
Surge arrester for use in size 1 NH fuse holders
With fault indicator for remote signalling; allows for use of NH fuse holders with microswitch
(max. tripping distance of indicator of 7 mm)
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.
Surge Arresters Type 2
Another considerable ad -
vantage 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
was 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.
www.dehn.de
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