Contact Unit (Qbca1 Type), 24 V Dc, 2Hf/4B Complete With Plug Board (Base Plate), Connect Ors, Retaining Clips Etc And Conforming To Brs-943 And Rdso Spec. No. Irs:S-34, S-23, S-60 Or Latest, As Ap Plicable. The Interlocking Code For This Unit Shall Be Bcejk. [ Warranty Period: 30 Months After The Date Of Delivery ] ]