supply of insulation monitoring relay 415 volts a.c, 3 phase neutral isolated, volta ge range: 0 to 500 volts a.c,insulation measuring range: 10 kilo ohm to 150 kilo ohm, co ntrol supply 24- 240 volts ac/dc +/-10%, 50hz, make:- contrel make- ir 470ly- 21a, ri-r138, abb make- cm-iws.2s, schneider make- vigilohm/imd-im10, siemens make-3ug4581-1aw31 or dold make-il5880.12 or woka make or bender make only confirming to rdso letter no: el/7.1.108/mssbc dt:17-09-2021 for common bill of material items. [ warranty period: 30 m onths after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]