supply of insulation monitoring relay , insulation monitoring relay, 415v ac, 3phase, neutral isolated, rated voltage range 0-500v ac, insulatio n measuring range : 10 k ohm to 150 k ohm, control voltage :24-240v ac/dc, and place of installation s1a7, as per r dso spec.no. rdso/pe/spec/ac/0184-2015 (rev.1) & bom lr.no. - el/7.1.108/mssbc dt. -17/09/2021 suitable for lhb type ac coaches switch board cabinet (s1a7). acceptable makes as per bom: abb cat.no.cm.iws.2s, schneider cat no. vigil ohm/imd-im10, siemens cat no.3ug4581-1aw31, dold cat no. il 5880.12, contrel cat no. ir 470ly-21a, ri-r138, woka or bender only acceptable as per above rdso spec. as per drg.no. --- specn: rdso/pe/spec/ac/0184-2015 (rev. 1) & bom lr.no. - el/7.1.108/mssbc dt. -17/09/2021 [ warranty period: 30 months after the date of delivery ] ]