Service-life evaluations of low-voltage power circuit breakers and molded-case circuit breakers

This paper summarizes the methods that are typically used in industry to evaluate the service life of low-voltage power circuit breakers and molded-case circuit breakers. It reviews the electrical ratings and endurance requirements set forth in manufacturing standards, the ways that these endurance requirements can be used to develop expectations of circuit breaker life, the methods of maintenance inspections, and the interpretations of these inspections