83-851-501 - obsolete, alternative from another brand BremasErsce E100.00BI13;LIMIT SWITCH FOR MAIN TRANSFORMER RELIEF VALVE; SM-0AC5 SM-1AC5 83 106 87610050 - obsolete, successor 87 622 070;M/E Revolution Counter; 84211 Lts-464-0 84873021 83 850 303, obsolete Order code: 88866175 Type: RQR1 20-30VDC&20-264VAC 82 869 014 PN: 88881506 replaced by 88 827 155 83 990 129 + Hebel 79 215 138 (SP3969-10) 88 827 155 (Nachfolgetyp) 88827155 88 857 301 85 100 037, KNA3 XS - obsolete