Abstract:
Miniature Circuit Breaker (M.C.B) is a precision electromagnetic device which is fast replacing the
conventional main switch and fuse units used in the control of electric supply. With the use of MCB no
replacement of blown fuse is required and the risk of connecting wrong size of fuse wire eliminated. It
operates automatically and opens the circuit in case of electric overload or short circut. There is no
permanent deformation and it can be safely switched on again manually. Because of its precise
calibration it is much more reliable than the rewireable fuse. It thereby effectively protects the electrical
wiring and equipment. The MCBs are employed in many commercial / industrial establishments, hotels,
theatres, houses etc. Thae use of MCBs saves the sophisticated equipments like T.V. Air, Conditioner,
Refrigerator, Heating appliance etc. from short circut and voltage fluctuation. These are finding vase use
in domestic sector as protective device.
