MCBs or Miniature Circuit Breakers are electromechanical protection devices which protect an electrical circuit from an overcurrent of any kind. The overcurrent, in an electrical circuit, may result from short circuit, overload, wrong device selection or faulty design. An MCB is more or less same in function with fuse, but better than Fuse since it does not require replacement once an overload is detected. Unlike fuse, an MCB can be easily reset and thus offers improved operational safety and greater convenience without causing large operational cost.