E-009 Circuit Protection Devices

E-009 Circuit Protection Devices

Circuit Protection Devices

The Circuit Protection Devices online PDH course is a part of the Electrical Engineering category of courses. This course will introduce you to circuit protection devices used to limit the current or open the circuit in fault condition. The conditions that requires circuit protection are direct shorts (or short circuit), excessive current, and excessive heat.

The two types of circuit protection devices discussed in this course are Fuses and Circuit Breakers.

A Fuse is the simplest circuit protection device based on copper wire connection sized to carry nominal current rating. Excessive current will melt “fuse link” and protect circuit. Fuse will need to be replaced after opening the circuit. Once the problem that caused the increased current is solved, a new fuse must be installed in the circuit.

Circuit Breaker is the mechanical device that will open circuit when current exceeds nominal listed value. Circuit breaker is safe, reliable and tamper proof device that is resettable and can operate multiple times without replacing any parts.

After completion of this course you will have a basic understanding of the Circuit Protection Devices: Fuses and Circuit Breakers.

This course is intended for electrical engineers and other professional engineers interesting in general knowledge of electrical circuitry.

Learning Objectives:

At the end of the course, you will be able to:

  • Identify the reasons for circuit protection.
  • Identify types of circuit protection.
  • List the categories of fuse time delay rating and state a use for each type.
  • List the methods of checking for an open fuse.
  • Select appropriate type of fuse replacement.
  • List the five main components of the circuit breaker.
  • Describe circuit breaker tripping mechanism.
  • List time delay rating of the circuit breaker.
  • List the steps to follow before circuit breaker maintenance.

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