The maximum normal current ratings for an MCB or Miniature Circuit Breaker and an MCCB or Moulded Case Circuit Breaker are different as they each serve to protect different kinds of circuits. The maximum normal current rating of an MCB can typically range up to just 125A, whereas the maximum normal current rating of an MCCB is usually much higher, ranging from 16A to as high as a whopping 1600A.