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High-voltage surge arrester / type 1 / polymer - 9 - 36 kV | INZP series
The Polymeric INZP surge arrester tested and certified with the latest industry standard ANSI/IEEE C62.11 - 1993 for metal oxide arresters in addition to the IEC 99 - 4 for class line. These arresters are specifically designed to provide the complete set of benefits equipped by the metal oxide distribution arrester in light-weight, low profile polymeric housing suitable for both indoor and outdoor overhead applications. The issues related with chipped or cracked porcelain, that arise due to rough handling or shipping, are completely eliminated by the polymeric housings. The porcelain housed units result in failure mode that are much severe than that arising with these INZP arresters.
In case of failure conditions with polymer housings, these INZP arresters split open in order to relieve the internal pressure. Unlike these, the case with porcelain housing is disastrous. When a violent failure condition arises with porcelain housings, thermal fracture of the porcelain housing occurs due to the internal arc from excessive fault current, which in turn causes the hot gases created by the arc to explode the porcelain fragments in all directions.