"Equipment:MAIN SWITCH BOARD, 

Maker:SCHNEIDER ELECTRIC                           

Assembly: SPARE PARTS / DWG 003008EB-1    " "Switch S-39 spring return to center

1-start ,2- off ,3-stop. Located in synhro panel engine control. CLAUS & NAIMER TYPE:CA-10 B" SCHNEIDER.CA-10B.NA