RDSO Sub Item ID No. 3100385019:- Relay AC Immune plug- in type, Style QNA1 DC Neutral line, 24V, 12F/ 4B contacts front and back contacts metal to carbon with plug board, retaining clip and connectors Code ABDFH confirming to BRS- 931A, IRS: S- 60- 78, IRS: S34 and IRS: S- 23 [ as applicable ].