Interlock device

An interlock device for a bypass device, the bypass device being configured to switch a load between a first power supply and a second power supply and comprising a two-position Automatic Transfer Switching Equipment (ATSE) having a first switch and a second switch and a three-position Manual Transfer Switching Equipment (MTSE) having a third switch and a fourth switch, each of the first switch and the third switch being configured to connect the load to the first power supply or disconnect the load from the first power supply, and each of the second switch and the fourth switch being configured to connect the load to the second power supply or disconnect the load from the second power supply, the interlock mechanism comprising:

• a Rack In Rack Out (RIRO) mechanism, configured to drive the ATSE from a non-operating position to an operating position and drive the ATSE from the operating position to the non-operating position;
• a first interlock mechanism, configured to prevent the RIRO mechanism from driving the ATSE from the non-operating position to the operating position when the first switch and the fourth switch are both switched on;
• and
• a second interlock mechanism, configured to prevent the RIRO mechanism from driving the ATSE from the non-operating position to the operating position when the second switch and the third switch are both switched on.