A Miniature Circuit Breaker (MCB) is a protective device designed to prevent damage to electrical appliances by breaking the circuit when overload or faults occur. MCBs are more efficient and safer compared to traditional fuses, as they can be reset without replacement and operate quickly during electrical anomalies. Various types of MCBs are available, and they are widely used in homes, commercial spaces, and industries, with purchasing options available at discounted prices online.