Supply Of Relay, Ac Immune, Plug In Type, Style Qbca1, Dc Biased Point Contactor, 24 V Dc, 2Hf-4B Contacts, Front Contacts Heavy Duty And Back Contacts Metal To Carbon, Complete With Plug Board, Retaining Clips & Connectors Conforming To Brs 943, And Rdso Specn. Irs S-34 & Irs S-23 Code Bcejk To Brs- 943 And Rdso Specn.No.Irs:S-34 & S-23 With Amdt. Up To Date As Applicable Or Latest, The Interlocking Code For This Unit Shall Be Bcejk . Make/Brand-Wsf Or Cg Power Or Similar.