Difference Between MCCB and MCP (MPCB)

As Lyn said elsewhere, you seem to have started trying to learn electrical engineering on CR4. Doable, will take a long time. _{^{(Btw lyn, how much for that crystal ball from LynDoor™ ?)}}

Specific to MPCB (Motor-protection Circuit Breaker)....you can study more HERE

1. It is phase-loss sensitive

2. It may be ambient compensated.

3. In lower sizes, the heater resistance restricts the fault current. >6 A or 10A, you need fuses to back up. _{These are not sophisticated current-limiting MCCBs.}

The term "MCP" is not universally applied around the world, so it will depend on the context of where you are and/or who is reviewing your submittal.

Here in the US, an MCP is an MCCB with no thermal trips, for specific use in factory assembled, tested and listed combination motor starters where there is a separate thermal protective element, such as an overload relay. There is no other legal use for them, including field assembly or use in custom control panels. But the term MCP is actually a trademarked brand identifier of the old Westinghouse breakers, now owned by Eaton. So you will never see that term officially described in specifications. the "official" descriptor is an IT MCCB, for Instantaneous Trip Molded Case Circuit Breaker.

In IEC world, MCP has been unfortunately used to describe a different device, a motor protective device that has mag trips and adjustable thermal trips, essentially taking the place of the MCCB + TOL. This is the MPCB that KV mentioned above. In larger sizes these are Molded Case, but smaller ones are not.

MCCB: Moulded Case Circuit Breaker - having a thermal release & an instantaneous release and having very high short circuit breaking capacity. The thermal curve is not a very fine curve as to offer perfect protection to motor winding against overloads. They are deisgned to protect feeder cables.

MPCB: Motor Protection Circuit Breaker- having a thermal release & an instantaneopus release and having a limited short circuit breaking capacity. The thermal curve is the same as that of a bimetal overload relay, offering close protection to the motor winding against overloads.

Type-2 co-ordination charts are available both for MPCB + Contactor and MCCB + Contactor + External Thermal Overload Relay