A free app for Android, by Engineering Wale Baba.

Switchgear And Protection is a free handbook app for engineering science and professionals who want to learn and revise all the important concepts quickly and efficiently. It is designed to help the users to understand and learn all the important topics, concepts, formulas, diagrams, and equations in simple language. 

The app consists of 9 chapters covering all the important topics in engineering.

The first chapter contains a brief introduction to the concept of switchgear, the second chapter contains a detailed description of the various types of switches, and the third chapter contains a discussion of their operation and their advantages and disadvantages. The fourth chapter contains a detailed explanation of the various concepts of electrical protection, such as ground, neutral, and live. The sixth chapter contains a discussion of the various ways of protecting a circuit from overcurrent, such as fuses, limit switches, and thermal cut-off switches. The seventh chapter contains a detailed explanation of the different types of power semiconductor devices, such as the diode, the light-triggered thyristor, the power MOSFET, and the power semiconductor switching element. The eighth chapter contains a detailed explanation of the operation of the circuit protection system. The ninth chapter contains a short summary of the topics covered in this app.

The app also contains many tables, graphs, and equations to help the users to understand the concepts better.