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, 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.