After finishing this lesson, you will be able to explain the design and function of commonly used fuses and circuit breakers, and how to test and protect them. • Identify some applications that employ fuses • Compare the operation of plug fuses to cartridge fuses • Discuss factors to consider before replacing a fuse • Explain the general function of a circuit breaker • Identify three methods of extinguishing an arc in an air circuit breaker • List commonly used types of circuit breakers and compare their operation
