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9 comments
Participant

Join Date: Aug 2008
Posts: 4

Difference Between MPCB and MCB

08/17/2008 6:45 AM

what is the difference between motor protection circuit breaker and miniature circuit breaker. In some cases i saw MCB is used for the protection of motor. what are the constructional and technical feature difference.

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Anonymous Poster
#1

Re: Difference Between MPCB and MCB

08/18/2008 2:52 AM

Is this Shine Raj from GPT Cherthala? msg me on shineraj(at)gmail(dot)com

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Guru
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#2

Re: Difference Between MPCB and MCB

08/18/2008 9:36 AM

Hi shineraj,

MPCB (Motor Protection Circuit Breaker) is a combination protection unit comprising the functions of a switch, a short circuit protective device and an over load relay. They are designed for various current rating to suit different capacity motors. Their quality is defined as per IS 13947 / IEC 947

MCB is only a simple circuit breaker which has only limited capability of overcurrent and short circuit current protection.

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Participant

Join Date: Aug 2008
Posts: 4
#3
In reply to #2

Re: Difference Between MPCB and MCB

08/18/2008 10:09 PM

Thank you sir

sir you mean there is no inbuilt overload relay in MCB and have in MPCB

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Guru
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#4
In reply to #3

Re: Difference Between MPCB and MCB

08/19/2008 3:25 AM

Hi shineraj,

To have better information about MCB please read the following link. this wikipedia chapter give a very good information about all types of circuit breakers like MCB,MCCB,OCB,MOCB ,ACB, and VCB.

ttp://en.wikipedia.org/wiki/Circuit_breaker

A Motor Protection Circuit Breaker (MPCB) may normally provide the following protective and control functions.


1. Short-Circuit Protection (Magnetic Protection)

2.Overload Protection (Thermal Protection)

3. Switching (Manual)

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Participant

Join Date: Aug 2008
Posts: 4
#5
In reply to #4

Re: Difference Between MPCB and MCB

08/19/2008 3:42 AM

Thank you sir i will read it.

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Anonymous Poster
#6

Re: Difference Between MPCB and MCB

08/19/2008 10:46 AM

Important difference between MCB / MCCB and MPCB is the flexibility of MPCB for closest trip curve selection with regard motor withstands characteristics in starting and normal operation modes. Also an MPCB is now able to take care of fault currents and switching transient currents and isolate the circuit much more quickly on an actual fault.

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Anonymous Poster
#7

Re: Difference Between MPCB and MCB

05/18/2009 7:26 AM

MCB USED FOR OVERLOAD PROTECTION FOR FIXED RANGE SAY 16 AMP 20 AMP ETC...

BUT MPCB HAVING RELAY RANGE FOR THERMAL PROTECTION FOR EXAMPLE 6 TO 10 AMP WE CAN SET AS PER OUR REQUIRMENT.

MPCB ALSO USED FOR SHORT CIRCUIT PROTECTION AS PER INBUILT MEGNETIC RELESE AND OPERTING TIME IS FOR 5 MS. BUT I SUGGET THAT FUSE IS BEST FOR SHORT CIRCUIT PROTECTION RATHER THAN MPCB.

SAME WAY I EXPLAIN FOR ELCB - ELCB IS ONLY FOR EARTH FAULT PROTECTION AND NEVER OPERATES IN OVERLOAD PROTECTION.IF WE ARE USING 40 AMP ELCB WITH 30 MA CURRENT ,IT IS ALWAYS OPERATES IN EARTH FAULT BUT WE HAVE GIVE BACK UP PROTECTION FOR 40 AMP RESTRICT TO PASS THEM.

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Guru
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#8

Re: Difference Between MPCB and MCB

05/18/2009 11:50 AM

Already asked and answered just last week. You should learn to use the search function.

http://cr4.globalspec.com/thread/37722/MPCBs-vs-MCBs

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** All I every really wanted to be, was... A LUMBERJACK!.**
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Anonymous Poster
#9
In reply to #8

Re: Difference Between MPCB and MCB

12/31/2009 12:25 AM

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.

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Anonymous Poster (4); JRaef (1); shineraj (2); V.I.Abraham (2)

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