1. time delay auxiliary contact blocks 2.IS09000,CE certification 3.reasonable price,punctual ... delivery,high quality Application:F4-D-A1 series auxiliary contact blocks are installed on the top of F5-D- ... or AC contactor for more auxiliary contacts. Adopting the contact functions of sliding frictions,the item can be self-cleaned ... 2NC4NO4NC1NO+3NC3NC+1NC F4-D-A1, A2 series auxiliary contact blocks