supply of insulation monitoring relay, 415v ac, 3 phase , insulation monitoring relay, 415v ac, 3 phase, neutral isolated, voltage range 0-500v ac, insulation measuring range 10k ohm to 150k ohm, control supply 24-240v ac/dc, place of installation - s1a7, used for insulation control of 415v in lhb type ac coaches, c onforming to rdso specification no. rdso/pe/spec/ac-0184-2015 (rev-1), suitable for use in s witch board cabinet of lhb type ac coaches. accepted make & cat no.: as per sr. no. 68 of rd so letter no. el/7.1.108/mssbc, dated 17.09.2021, or any other rdso approved make [ warrant y period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]