MCCB - Moulded Case Circuit Breaker
It is the replacement of SDF. advantage over SDF is - SDF may bring the situation for single phasing but MCCB won't.
Especially in SDF line, you have put Single Phase Preventer. with MCCB you have avoid it.
MTBF is more for MCCB.
Control from Remote location is possible in MCCB.
OLR Characteristics in accurate like OLR and MPCB is not there in MCCB.
MPCB - Motor Protection Circuit Breaker
It is the combination of OLR and Fuse. i.e., if you are having a feeder with SDF and OLR you can replace it by only one MPCB.