Tenders for Supply of Relay Ac Immune Plug-In Type Qta2, Dc Neutral Track Relay, 9 Ohms, 2F/1B Front & Back Contacts. Metal To Carbon, Complete With Base Plug Board, Retaining Clip And Connectors Confirming To Brs 939A & Brs 966 Appendix-F2 Irs : S-34 & Irs : S-23 As Applicable. Interlocking Code Fghkx.