Oil circuit breaker construction course, in this course we will learn about the Oil Circuit Breaker construction, focusing on the key components and their assembly. Students will explore the principles and techniques involved in building efficient and reliable oil circuit breakers. Key topics include understanding the structure and function of the main tank filled with insulating oil, which acts both as a coolant and an insulator to prevent electrical arcing. The course will delve into the construction and operation of the contacts, which open and close the circuit, and the arc extinguishing chamber, where the arc is safely quenched. We will also cover the bushings that insulate the conductors passing through the tank, and the mechanisms that drive the opening and closing of the contacts. Emphasis will be placed on the importance of each component in ensuring the breaker's effectiveness in protecting electrical systems from faults. Practical sessions will provide hands-on experience in assembling and maintaining oil circuit breakers, ensuring that students gain the necessary skills to work with these critical devices. By the end of the course, participants will be well-versed in the construction, operation, and maintenance of oil circuit breakers, enhancing their ability to ensure electrical system safety and reliability.