Electricity plays a vital role in our daily lives. However, electrical faults such as overloads and short circuits can cause serious damage. To prevent this, a Miniature Circuit Breaker (MCB) is used. It is a safety device designed to protect electrical circuits from damage due to excess current. What is an MCB? An MCB is an automatic switch that trips and disconnects the circuit when excessive current flows through it. Unlike traditional fuses, an MCB does not need replacement after tripping. It can simply be reset, making it more convenient and reliable. Current Ratings of MCB MCBs are available in different current ratings. The common ratings include: 1, 2, 4, 6, 10, 16, 20, 25, 32, 63, and up to 125 Amperes. How Does an MCB Work? An MCB operates using two main principles: Thermal Operation (Overload Protection) A bimetallic strip inside the MCB bends when heated due to continuous overcurrent. This bending causes the contacts to separate, disconnecting the circuit and preventing ove...
Welcome to FM Techie! A blog for Facility Managers, Engineers, and teams, offering insights on maintaining Diesel Generators, Transformers, UPS, STPs and more. We cover facility management, property management, soft services, safety, and provide SOPs, checklists, and logs helping you manage facilities efficiently and safely.