CB are classified on the medium that they use mainly there are ACB(uses air as a medium) VCB SF6 OCB Suitable for high voltage and high breaking capacities. Other than these there are MCB,MCCB,RCCB,ELCB,MPCB etc suitable for low voltage and low breaking capacities.
So many are there but about whom I know MCB, MCCB, RCCB depending upon medium in circuit breakers these are of Vacuum ckt brkr, oil ckt brkr, gas ckt brkr. ddeddepddeddepeddedddeddddeddepddeddepeddeddde