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AC Motor Protection

COURSE NO: E03-034
AC Motor Protection
Course Highlights

This online engineering PDH course addresses issues related to protection against external and internal motor faults. It presents AC motor protection terminology and concepts and techniques that are used for overload, single phasing, under-voltages, unbalanced supply and reverse phase sequence faults.


There is a wide range of AC motors since they can be used in numerous applications. AC motors need to be protected but protection selection usually does not depend on the motor and load type. This selection is based on the fundamental AC motor operation processes. There are crucial differences between the protection of induction motors and synchronous motors. Motor operation characteristics have to be particularly considered when applying selected protection. This approach is more important for the motors than for any other power system element.


For example, the starting and stalling currents/times have to be known and taken into account when using overload protection. Also the thermal withstand of the AC motor has to be precisely defined under balanced and unbalanced loading conditions. The conditions for which AC motor protection is needed can be separated into two main groups: imposed external conditions and internal short circuits.


This 3 PDH online course is suitable for electrical engineers with a desire to understand the fundamentals of AC motor protection. 

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Thermal (overload) protection
  • Start/stall protection
  • Short circuit AC motor protection
  • Earth fault protection
  • Negative phase sequence protection
  • Protection against faults in rotor windings
  • Under-voltage protection
  • Under-frequency protection
Course Document

In this professional engineering CEU course, you need to review the course document, tilted “AC Motor Protection”.

To view, print and study the course document, please click on the following link(s):
AC Motor Protection (1.2 MB)
Course Quiz

Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty (20) questions to earn 3 PDH credits. The quiz will be based on the entire document.

The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: