Square D EIK032 Electrical Interlock Switch Kit Brand: Square D. Part Number: EIK032. Square D Electrical Interlock Switch Kit, Auxiliary, Series: F Series, 60 A, For Use With: Series F General Duty Safety Switch. Additional Description: SQD -EIK032 ELECTRIC INTERLOCK KIT FOR SWITCHES. Catalog Description: Interlock, safety switch, 2 x NO, 2 x NC contact, general duty fusible series F 60A or heavy duty series F5/F6..