MOTOR OPERATED CIRCUIT BREAKER CONTROL

摘要

A motor operating device for reciprocating a circuit breaker handle structure between operating positions comprises a reversible motor, an opening relay, a closing relay and limit switch means operable to interrupt the motor circuit and to deenergize the energized relay. The limit switch means comprises a pair of mechanicaly interlocked molded-case circuit breakers with each of the circuit breakers being in series with a separate one of the reversible motor windings and in series with a separate one of the relay coils. Each of the relays is a four pole relay with one pole controlling the associated seal-in circuit; one pole controlling the associated motor energizing circuit; one pole providing an electrical interlock with a pole of the other relay; and one pole cooperating with a pole of the other relay to provide a dynamic braking circuit. The motor operated circuit breaker is also manually operable, and the control circuit is automatically prepared for an electrical operation to either the reset position or the closed position following a manual operation to the open position.