An Introduction to IEEE Standard 1458-2017: Recommended Practice Update for Molded-Case Circuit Breakers for Industrial Applications

IEEE standard 1458-2017 is an updated recommended practice (RP) that provides in one document the information necessary to select, apply, and maintain (determine the remaining life of) molded-case circuit breakers. The document provides information on the basics of circuit breaker design and presents a detailed procedure to determine when molded-case circuit breakers must be replaced. Informative annexes introduce guidelines on the reuse of low-voltage circuit breakers, the use of moldedcase circuit breakers for dc voltage and frequencies greater than 60 Hz, and static converter feeder circuit breaker applications [1].