supply of relay, qn1, 8f / 8b.relay, qn1, 8f / 8b., supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf. , supply of relay, non ac immune, plug in type, style qn1, dc neutral line, 24 v dc, 8f / 8b contacts, front and back contacts, metal to carbon with plug board, retaining clip and connectors conforming to brs : 930, irs : s34 and irs : s-23 or latest ( as applicable ) . the interlocking code for this unit shall be abcdf with atc clips.