Abstract: The low-voltage breaker is a kind of switch electrical appliance.It can get on and cut the distribution circuit and protect all kinds of faults.It can be widely used in the low-voltage distribution system.This dissertation is designed is 63A molded case low-voltage circuit breaker,This paper makes DZ20 molded case low-voltage circuit as an example,in detail introducing the molded case low voltage break design process,including the designs of conduct electric system,kill arc system,overcurrent time-relay releaser,short-circuit instantaneous-action organization.use the software “Pro/E” to proceed 3D reallike.
Keywords:molded case;low-voltage circuit breaker; releaser ;electromagnetic organization.