Back To Basics

Welcome to Module 6, which is about Medium Voltage Power Circuit Breakers.

By medium voltage, we mean a voltage range of 1000 volts to 38 kV. (Some consider 72.5 kV as the upper end of medium voltage, but we will work with 38 kV for the purpose of this training module.)

Figure 1. Family of Medium Voltage Vacuum Circuit Breakers 

Like the other modules in this series, this one presents small, manageable sections of new material followed by a series of questions about that material. Study the material carefully, then answer the questions without referring back to what you’ve just read.

You are the best judge of how well you grasp the material. Review the material as often as you think necessary. The most important thing is establishing a solid foundation to build on as you move from topic to topic and module to module.

A Note on Font Styles

Key points are in bold.

Glossary items are italicized and underlined the first time they appear.