As noted in NFPA 70B, insulated-case and molded-case circuit breakers should be kept clean of external contamination (Comstock/Stockbyte/Thinkstock). Low-voltage ...

All questions and answers are based on the 2011 NEC. Q. What is the Code requirement for the use of slash versus straight voltage rated breakers? A. A circuit breaker with a straight voltage rating, ...

Testing your 240V circuit breaker panels is also important to ensure all of the wiring going into the individual breakers has not become loose or broken. “It’s also good to look at it and just make ...

ABB has released a new 145-kV high-voltage circuit breaker. The 145PM63-B high-voltage circuit breaker uses a new high-performance interrupter to serve 121-145 kV applications at 40-, 50-, and 63-kA ...

Solid−state circuit breakers using SiC devices are particularly well-suited for protecting next-generation power systems.