Automatic transfer switch utilizing back-to-back mounted molded case circuit breakers or molded case switches to connect a load to a normal power source and a standby power source
An automatic transfer switch (ATS) utilizing molded case circuit breakers (MCCB) or molded case switches (MCS) to connect and disconnect an electrical load to a Normal power source and a Standby power source. The ATS comprising two MCCB or MCS mounted back-to-back one connected to a Normal power source and the other to a Standby power source. Bus bars electrically connect the poles on the load side of the MCCB or MCS connecting the ATS to a load. A rotating cam drive mechanism drives Toggle Levers with attached stored energy opening springs toggles to open and close the MCCB or MCS through the leverage of fulcrum points. A ratchet mounted on the output shaft of a unidirectional gear motor rotates the cam drive mechanism. An interlock bar prevents both MCCB from closing at the same time.
1. An automatic transfer switch (ATS) utilizing molded case circuit breakers (MCCB) or molded case switches (MCS) to connect and disconnect an electrical load to a Normal power source and a Standby power source, said ATS comprising:
two molded case circuit breakers (MCCB) or molded case switches (MCS) mounted back-to-back to connect a load to a Normal power source and a Standby power source;
bus bars electrically connecting the poles on the load side of the MCCB or MCS connecting the ATS to a load;
a rotating cam drive mechanism driving toggle levers with attached stored energy opening springs to toggle open and closed the MCCB or MCS through the leverage of fulcrum points;
a ratchet mounted on the output shaft of a unidirectional gear motor to rotate the cam drive mechanism and declutch from the motor shaft when the cam drive mechanism is manually operated;
a fixed length non-conducting interlock bar located between movable elements of each MCS or MCCB to prohibit the opposite switch from closing at the same time; and
a safety lock that blocks operation of the cam drive by manual transfer handle and also signals an ATS controller to disconnect electric power to a gear motor.