Procurement Of Relay, Non-ac Immune Plug-in-type, Style Qn1 Dc Neutral Line, 24v, 8f/8b Contacts, Front And Back Contacts Metal To Carbon Complete With Plug Board, Retaining Clip And Connectors Conforming To Brs-930, Irs-s-34 & Irs-s-23 Amdt. Upto Date As Applicable. The Interlocking Code For This Unit Shall Be Abcdf Etc..