Tenders for Supply of Relay Dc Non-Ac Immunized, Plug In Type Style Qn1 Neutral Line 24 V Dc 8F 8B Contacts Front & Back Contacts Metal To Carbon Complete With Plug Board Retaining Clip And Connectors Conforming To Brs: 930, Irs: S: 34 & Irs: S: 23 As Applicable The Interlocking Code For This Unit Shall Be Abcdf..