Circuit Breakers and Fuses

This course provides an in-depth examination of overcurrent protective devices, which are essential for electrical system safety and reliability. Participants will explore the causes and effects of electrical faults and overloads, learning to distinguish between different overcurrent conditions.

The course covers circuit breaker and fuse construction, operating principles, and proper selection criteria, including voltage, current, and interrupting ratings. Students will master selective coordination concepts, short-circuit calculations using the point-to-point method, and systematic troubleshooting techniques. Special attention is given to GFCI and AFCI technologies, National Electrical Code® requirements, safety protocols, and the critical role these devices play in protecting electrical systems from damage while ensuring personnel safety.

By the end of this course, you will be able to:

• Explain the purpose and function of overcurrent protective devices.
• Describe the effects of overcurrents, including faults and overloads, on electrical systems.
• Explain the operation and identify common types of circuit breakers.
• Describe the function, ratings, and types of fuses.
• Compare circuit breakers and fuses in terms of operation and application.