Fuses and Circuit Breakers (A8008)

Learn how fuses work and understand the maintenance and application fuse operation.

Prerequisites

This lesson is designed for participants familiar with AC and DC theory, electrical safety, electrical schematics, and the proper use of hand tools and test instruments.

Description

This lesson describes fuses and circuit breakers, and how they work. This lesson shows and explains maintenance, testing, removing, and installing fuses and circuit breakers. This lesson discusses molded case, multiple, and ground fault circuit breakers.

Objectives

Describe the basic mode of operation of a fuse. Identify the specification information. Verify that a circuit is de-energized. Select the proper replacement fuse and install it. Describe the operation of a small, molded case circuit breaker. Reset a tripped circuit breaker. Explain circuit?breaker sensing mechanisms and perform preventative maintenance on a circuit breaker panel. Install a circuit breaker and identify one that is a multiple. Use a characteristic trip curve to?interpret test results. Identify and test the operation of a ground fault circuit breaker and install it.