T he miniaturization and the maintenance free of permanent magnetic operating mech anism can be achieved by electronic-controlled driving device.An intelligent con trolling and electronic driving device developed for this type of mechanism in this paper adopts CPLD to perform the intelligent control and electronic swit ch being composed of SCR and IGBT to control the opening/closing coil current.Th e device can not only control opening/closing operation of circuit breaker

but a lso has the functions of over-current/under-voltage trip

closing/opening inter lock for mal-operation and monitoring and diagnosis and warning for the failure of the operation system.After successfully operating experiment in a vacuum circ uit breaker with this device

a reasonable time period to break the opening/closi ng coil current by the electronic switch is presented.