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Overcurrent Protection Fundamentals

COURSE NO: E06-011
Overcurrent Protection Fundamentals
Course Highlights

This online engineering PDH course provides rules for time/current relay grading, IDMT protection characteristics, protection relay connections, as well as directional and ground protection.


Relay protection against high current was the earliest relay protection mechanism to develop. From this basic method, the graded overcurrent relay protection system, a discriminative short circuit protection, has been formulated. This should not be mixed with ‘overload’ relay protection, which typically utilizes relays that function in a time related in some degree to the thermal capacity of the equipment to be protected.


This 5 PDH online course is suitable for engineers with a desire to understand overcurrent protection fundamentals.

Learning Objectives

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

  • Understanding the rules for time/current grading
  • Learning about IDMT overcurrent protection curves
  • Learning about grading relay-relay, fuse-fuse and fuse-relay
  • Learning about protection relay connection
  • Learning about directional and ground fault protection
Course Document

In this professional engineering CEU course, you need to review the course document which is based on relevant ANSI, IEEE and IEC standards and widely adopted industry practice of setting overcurrent protection relays.

To view, print and study the course document, please click on the following link(s):
Overcurrent Protection Fundamentals (2.5 MB)
Course Quiz

Once you complete your course review, you need to take a multiple-choice quiz consisting of thirty five (35) questions to earn 6 PDH credits. 

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: