To protect the electrical distribution system and electrical devices against short-circuit(if the defect has been caused by failure or incorrect connection) and to protect the electrical distribution system against overload(if the circuit has not been damaged but an extreme thermal overload occurred which could damage the wiring).

It's especially suitable for common installation with switchboards and switching points of low-voltage end circuits. It is designed mainly for alternating current but they can also be used for direct current for which the reduction of short-circuit resistance by approx. about 20% has to be taken into account (because of a higher stress of contacts).

The product is manufactured in accordance with a particular European standard EN60898, they are able to comply with any design requirements for arrangement of MCBs with regard to the selectivity and requirements for individual characteristics B, C and D.