Overwaltage Protection with Varistor Technology
01 October 2008
High, 12.5 kA (10/350µs) discharge current, space-saving design, non-expulsion arrester and other efficient functions- Weidmüller release the Pluggable Class I Surge Arrestor.
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. Due to a low residual voltage of <1.3 kV PU I devices are also suitable to provide Class II overvoltage protection.
Weidmüller's new PU I is a Class I arrester with varistor technology. In comparison with spark-gap based Class I arresters available on the market, the PU I offers a compelling range of extensive functions as well as cost-saving benefits. It is presently the slimmest varistor-based Class I arrester for TN systems. For instance, the design width of the 1-pole version is just 17.5 mm. With limp: 12.5 kA the PU I fulfils IEC 62305-3 (VDE 0185-305-3) requirements and can be utilised in buildings classified in lightning protection zones III/IV. Featuring a high discharge current of 12.5 kA (10/350 µs), a non expulsion arrester and a high-quality design, this overvoltage protection device also boasts a small footprint, which ensures it fits comfortably in all sub-distribution boards and switchgear assemblies. Its key component, the varistor, is pluggable by design. It is simple to replace following a tripping operation - with no need to disconnect the wiring. The tripping operation itself is indicated by a red/green functional display on the front of the device. The colour 'green' indicates one-hundred percent, unrestricted protection. 'Red indicates that the arrester is defect and must be replaced immediately. The optional remote signalling contact is integrated in the compact installation housing without increasing the size of the device.
The bases can be rotated through 180° so that pluggable devices ensure a clear overview of the electrical cabinet interior: wire termination can be performed from above or below. Consequently, the arrester is always used correctly. That also simplifies the connection with cross-connectors behind an RCD device (Residual Current protective Device). All protection elements are mechanically coded to prevent inadvertent replacement of arresters with different voltage ratings. Furthermore, clearly legible marking guarantees correct voltage coding.
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. PU I products are predestined for applications with different earthing systems (TN, TT) and common mains voltages (230/400 V) where they provide effective protection against overvoltages and transient power disturbances. Developed with the characteristic Weidmüller design, the PU I devices feature a black base and orange-red arrester. They are rated for use in operating temperatures between -40 °C to 70 °C. All PU I overvoltage protection devices are tested in accordance with IEC 61643-1 and EN 61643-11.
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