@sinnadurai sripadman said:
ABB has made MCB with high breaking capacity like 25 or 50kA unlike 10kA,I remember reading in a website,you can get more information from manufacturer’s publications from ABB,Hager etc
Dear ;
All serious manufactures like ” Schneider Electric, hager, ABB, … ” have MCBs with ” up to ” 50kA ” as Breaking Capacity, but especially for the ” Breaking Capacity ” we should know the following :
1- The MCB should be tested according to ” IEC 60898 or IEC 60898-1 “, and also can be tested according to ” IEC 60947-2 “.
2- The Breaking Capacity’s value should be written as follow :
– According to ” IEC 60898 or IEC 60898-1 ” : in ” Amp ” like ” 3000A or 6000A ” and absolutely in a
rectangular.
– According to ” IEC 60947-2 ” : in ” kA ” like ” 6kA or 10kA “
3- According to ” IEC 60898 or IEC 60898-1 “, the Breaking Capacity’s value of any MCB should be written on the front face, and the value according to ” IEC 60947-2 “, if tested, can be written on the side.
4- Normally, the values according to ” IEC 60947-2 ” are bigger than those according to ” IEC 60898 or IEC 60898-1 “, because the sequences of testes are different.