supply of relay ac immune, plug in type, style qta2 dc neutral track, 9 ohms, 2f/1b front and back contacts,relay ac immune, plug in type, style qta2 dc neutral track, 9 ohms, 2f/1b front and back contacts,,relay ac immune, plug in type, style qta2 dc neutral track, 9 ohms, 2f/1b front and back c ontacts, metal to carbon complete with plug board, retaining clip and connectors, conforming to rdso spec. no. brs:939a, brs:966 & appendix f2, irs:s-34 and irs:s-23 (spec. with amdt. up to date as applicable). th e interlocking code for this unit shall be fghkx. [ warranty period: 30 months after the date of delivery ] ]