IEEE C62.43-1999

This guide provides assistance in selecting the most appropriate type of surge protector for a particular data, communication, and/or signaling circuit application. This guide is divided into four clauses. Clause provides an overview and the scope of this guide. Clause lists references to other standards. Clause explains the electrical environment in which surge protectors intended for data, communications, and signaling circuits shall operate. Clause gives a description and the theory of the operation of surge protectors used in data, communications, and signaling circuit applications, and also gives guidance in applying and interpreting the respective test specifications for the protector characteristics. This guide also contains informative Annex , which supplies examples of applications of surge protectors used in low-voltage data, communications, and signaling circuits. The annex provides additional information for understanding and using this guide, but it is not part of the guide. Annex contains a bibliography of the references used in developing this guide. This guide applies to surge protectors used in balanced or unbalanced data, communications and signaling circuits with voltages equal to or less than 1000 Vrms or 1200 Vdc. The surge protectors covered are multiple-component series or parallel combinations of linear or nonlinear elements, packaged for the purpose of limiting voltage, current, or both. This guide is intended to complement IEEE Std C62.36-1994 . The definitions used in this application guide and the test methods standard are the same. For terms not defined in the guide or the standard, see The IEEE Standard Dictionary for Electrical and Electronics Terms. This guide is not intended to apply to packaged single component gas tube or air gap arresters/protectors, which are covered by IEEE Std C62.42-1992 . The purpose of this guide is to enable an understanding and an evaluation of the functions of the various types of multiple-component data, communications, and signaling circuit protectors in terms of particular applications. Consideration is given to the characteristics of multiple-component protectors and the concepts necessary to choose the appropriate product and to interpret its specifications.