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Iiuc, the 6612C (and 6632B) service manual refers to it as"A6 5063-3434 1 Relay Board (Optional)". Sadly, no further hints.Is a schematic available?
Links to the open source version of this board made by Bateau020 for 6632B power supplies (and some others):https://www.eevblog.com/forum/testgear/agilent-6632b-binding-posts/msg4466458/#msg4466458https://github.com/hb020/HP6632B_relay_boardAlso front binding posts with additional sense and ground.https://github.com/hb020/HP6632B_binding_post: