Weidmüller's PU I series of Class I overvoltage protectors with varistor technology, offers a discharge capacity of 12.5 kA (10/350 µs). The pluggable, self-monitoring surge voltage arresters are optionally available as 1-, 3-, or 4-pole versions and with optional remote signalling contacts. PU I devices can be rotated through 180° to simplify installation to the RCD device with cross-connecting combs.
This facilitates short-length PE connections. The PU I Series is distinguished by an extensive palette of product characteristics. For instance, a colour-coding system indicates 'degradation' of the surge arrester. The surge voltage arresters are suitable for different earthing systems (TN/TT) and are tested to IEC 61643-1 and EN 61643-11. Designed for use in buildings classified in lightning protection zones III/IV, all PU I devices are simple to install in sub-distribution boards and electrical cabinets. Another very positive feature: the new PU I does not require decoupling to the following Class II and Class III arresters, a cost-saving benefit from which the customer profits. With its low residual voltage of <1.3 kV the PU I can also be utilised for Class II overvoltage protection. All PU I devices are suitable for use in buildings classified in lightning protection zones III/IV - for example in hotels, libraries or public swimming baths.
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