T4 and T5 motor operating mechanism for plastic case circuit breaker of the latest generation of operating mechanism, has small volume, long service life (up to 20000 times), the advantages of reliable operation; With manual, electric dual functions at the same time, and can lock manually. Electrical operation has a visual indicator and signal remote machinery, remote control and PC, intelligent control and selective protection circuit breaker combination can realize the electrical chain, use of safe and reliable.