supply of relay qta2 ac immune, plugin type style dc neutral track, 9 ohm, 2f/1b contacts fron t and back contacts metal to carbon, complete with plug board, retaining clip & connectors conformin g to brs:939a, brs:966, (appendix f2), irs:s-34 and irs:s-23 (as applicable). the interlocking code f or this unit shall be fghkx. [ warranty period: 30 months after the date of delivery ] ] - relay qta2 ac immune