Introduction of Circuit breakers sides. CB are automated electrical switches designed to offer protection to electrical circuits from potential overload or short circuiting of the circuits. Circuit breaker devices have the ability of being reset either manually or automatically for normal operation to resume. The devices are designed in various sizes and shapes depending on the type of electrical circuit they are used in. Small circuit breakers are used to protect small equipment like household appliances and big devices are used to offer protection for high voltage circuits. Types of circuit breakers Miniature circuit breakers MCB is the standard acronym for miniature circuit breakers. These are electric switches used in low voltage electric currents to protect electrical cables and lines against thermal overload and short circuiting brought about by electromagnetic. The trip characteristics in such devices cannot be adjusted and they normally function through thermal or thermal- magnetic based operations. Miniature circuit breakers protect the equipment they are used in from excessive temperature and destruction brought about by potential short- circuiting. Molded case circuit breakers (MCCB) Molded case circuit breakers are types of protective electric switches having an electric current rating of up-to 2500A. The devices just like miniature circuit breakers use thermal or thermal- magnetic operation. The trip current found in these electric protective switches is highly adjustable to meet the needs of the appropriate electric circuit. These devices are common in combination starters, panelboards, switchboards and control panels. Motor protective circuit breakers These are special types of protective electric switches used specifically for motor based applications. They provide both overload and short circuit protection for individual motor loads they are used in. Motor protective circuit breakers can be used together with contactors to provide complete motor protection that is highly reliable. By doing so it is possible to curb and eliminate any form of malfunction likely to arise. Motor protective circuit breakers acre made of a combination protection unit consisting of switches, overload relays or short circuit protective device functions. Vacuum circuit breakers Vacuum circuit breakers are electrical devices that offer protection to electrical circuits and equipment or machinery by use of two electrical contacts that are enclosed in a vacuum. Vacuum circuit breaker devices are specially characterized by having minimal arching properties. The devices are used mainly in medium voltage applications. One of the electrical contacts is permanently fixed in a specific position while the other is left to roam freely. When the circuit breaker detects potential danger, the freely moving contact is made to pull away from the fixed one hence breaking the electric circuit preventing short circuiting or machinery damage.