To convert an SR12 from 3-phase to Single Phase Power, remove the three small bus bars and replace them with the two larger ones as shown in the attached drawing. Also, the red wire previously attached to the B phase is no longer used, and must be taped or heat shrieked to prevent accidental contact.
|1||7051A3098 Single Phase Connector Top SR12|
|1||7051A3099 Single Phase Connector Bottom SR12|
Note: This list assumes you have a complete 3-phase SR12 to begin with, and only includes the parts you will need in addition to those already installed.
SR12 3 phase to single phase drawing for more information.