Report of circuit breaker reliability survey of industrial and commercial installations

The Reliability Subcommittee of the IEEE Industry Applications Society carried out a survey of the reliability of circuit breakers in industrial and commercial installations to update information of previous surveys. They survey was restricted to circuit breakers that are less than 15 years old, and excluded molded case breakers. The data obtained include information on estimated numbers of operations per year for both fault and nonfault situations. Information has also been collected on low-voltage circuit breakers, comparing static and electromechanical integral trip devices