Reduction in current capacity by half of any 2 pole MCB

No.

No! Paralleling MCBs to share current is NOT an acceptable way of providing protection even if you can mechanically join the two mechanisms together to get them to both trip simultaneously.

Please, PLEASE read your local electrical standards and regulations as they are quite clear on this point!

Buy the correct sized MCBs for your application, they are not expensive.

Are you meaning to connect the MCB Poles in series? From what you have described, I understand that you are connecting the poles in series. (Incoming-Pole No. 1 Top Terminal-Pole No.1 Bottom Terminal-Pole No.2 Bottom Terminal-Pole No2 Top Terminal-Outgoing). In series connection how would the current rating come down?

But, one advantage definitely will be there. That of arc quenching. Inseries each pole contact would only see half the voltage and thus half the arc strength. So, damages to contacts due to arc will be reduced comparatively. IN DC applications, we do connect the MCB poles in series.

No. All it does is provide two chances of tripping on the same overcurrent instead of one.

If the breaker rating is too high, substitute a breaker with the correct rating.

From yr question,i can understand that u are connecting the 2 pole breaker in series.Thesame current flows thru the two breakers thus providing u with what i call double protection.In this case,it is not double protection,but single protection bcos d two breakers are nt seperate,but are linked together at d switch handle as a unit protection device,so thesame fault current trips the 2pole or 4pole breaker,whichever is applicable.

NO CURRENT IS REDUCED,but for advantage of arc quenching,tests could be carried out with extreme care to determine the issue of half voltage and half arc strength as stated by electricalexpert.

If u want to reduce yr current capacity,pls calculate and buy d appropriate single,double,tripple or four pole MCB.Be careful in making electrical connections.

Patrick Whowha

Thanx all of you for your precious info. & making me confident about my doubt/guess about the same i.e. the answer is NO.

Actually this information was given to us VERY CONFIDENTLY (& tried technically by him as he says) by our the most superior/highest authority in our company that you might guess we couldn't challenge him for the same.