What are the means of arc extinction in ACB?

There is a spring charging motor in the ACB. When the motor is supplied from a single phase 230 V, the motor is started and the contact of the ACB are closed keeping the spring fully charged and latched. When there is any over current in all the phases or in any of the phases, the built in over current relay closes its trip circuit and the trip coil unlatch the fully charged spring, then the contacts are opened by the mechanical energy charged in the spring. The arc is extinguished in the medium of normal atmospheric air.