Pub 50770 REV B 10250T/91000T Series D Contact Blocks with Early Closing and/or Late Opening Contacts Contact block circuits are identified by the symbols and nomenclature shown below and are laser engraved on all contact blocks. 10250T/91000T catalog numbers followed by suffix "E" have logic level contacts. These contact blocks have reduced operating strokes. Do not use with pushbutton type padlock attachments, 3 - position push-pull operators, 4 - position selector switches roto-push operators, or selector switch cam codes 6, 7, and 8. 1 N.C. - 1 N.O. 10250T55 & T56 91000T55 & T56 10250T57 & T58 91000T57 & T58 2 N.O. The N.O. (Early Closing) contact closes before the N.C. (Late Opening) contact opens. LATE EARLY OPENING CLOSING The N.O. (Early Closing) contact closes before the (Standard) N.O. contact closes. EARLY STANDARD CLOSING N.O. 2 N.C. 10250T45 91000T45 1 N.C. LATE LATE OPENING OPENING Effective 4/06 ECR PB#10595 10250T71 91000T71 The N.C. Contact is a Late Opening contact. LATE OPENING Pub 50770 10250T47 91000T47 The N.O. (Early Closing) contact closes before the (Standard) N.C. contact opens. STANDARD EARLY N.C. CLOSING The N.C. Contacts are Late Opening contacts. Pub 50770 1 N.C. - 1 N.O.