Protection and Switchgear is designed as a textbook for undergraduate students of electrical and electronics engineering. The book aims at introducing students to the various abnormal operating conditions in power systems, system protection schemes, and the phenomenon of current interruption. With the help of detailed relay and circuit diagrams, the book describes the protection principles of each element of the power system network, including relay design and settings. It also covers digital/ numerical relaying schemes, theories of the circuit breaking phenomenon, and the construction and working of switchgears.