Supply Of Relay, Ac Immune, Plug-in Type, Style* Qna1k, Dc Neutral Line, 24v, 1000 Ohms 6f.6b Contacts, Front Contacts Metal To Carbon And Back Contacts Metal To Metal/carbon, Complete With Plug Board, Retaining Clip & Connectors Conforming To Brs:931a, Irs:s 60-78, Irs : S 34, Irs : S 23 Rdso Spec.sts/e/relays/ueapi Dt. 30.5.97 Annexure-ii As Applicable. The Interlocking Code For This Unit Shall Be Cdeky..