from the Automation List department...
Engineering and workplace issues. topic
Posted by Sumit on 16 May, 2006 - 9:47 pm
What is the difference between MPCB & MCB and at the incomer of a control panel what is preferred?


Posted by David Baird on 19 May, 2006 - 12:37 am
MCB=Miniature Circuit Breaker
MPCB=Motor Protection Circuit Breaker

Posted by Wildwillywallace on 19 May, 2006 - 8:43 pm
Miniature circuit breakers (MCBs) are fitted as protection units in place of fuses. They have the advantage that they can be manually reset without having to replace wire as in the case of the traditional fuse. The MCBs have either a button or lever that can be flicked to reset it. The MCB tripping is an indication either that the circuit has been overloaded or that a short circuit has occurred somewhere in the system. Depending on their type they can rated for different applications -
B type - General Domestic Consumer Unit use
C type - Motor Rated
And others - Inductive, Capacitance, Reactive loads, etc.

The Motor Protection Circuit Breakers (MPCBs) provide short circuit protection, overload protection, and motor disconnect functions. The MPCBs may be combined with a magnetic contactor to provide 2 component combination starters and with the addition of an overload relay. They generally provide contacts to indicate position (Trip, Not Tripped) and also axillaries contacts normally open closed - Operational range usually from 0.11 A to 100 A and this is usually adjustable from the front of the unit as opposed to MCB which are generally set. They are also more expensive - Hope this helps.


Posted by Thimmareddy on 16 March, 2011 - 3:39 am
Thanks Brian, got clear understanding..


Posted by Elavazhagan.S on 30 May, 2006 - 10:56 pm

MCBs or Miniature Circuit Breakers are intended to give protection against overloads and short circuits, which can cause damage to cables and equipment.

MPCBs or Motor Protection Circuit Breakers are intended to give protection against overloads and short circuits & Motor protection function.

Both MPCB & MCB advanced version has auxiliary contacts & adjustable settings features.


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