Eaton, Mechanical Interlock Kit, For Use With Size"00", A, B, and C Freeedom Series Contactors and Starters, For Use 45MM, Cat# C321KM60K14B 
C321KM60K14B Interlock Kit by Eaton, Cutler-Hammer or Westinghouse
Eaton, Mechanical Interlock Kit, For Use With Size"00", A, B, and C Freeedom Series Contactors and Starters, For Use 45MM, Cat# C321KM60K14B
C321KM60K14B Interlock Kit by Eaton, Cutler-Hammer or Westinghouse
