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, Pl Ace Of Installation - S1A7, Used For Insulation Control Of 415V In Lhb Type Ac Coaches, Confi Rming To Rdso Specification No. Rdso/Pe/Spec/Ac-0184-2015 (Rev-1), Suitable For Switch Board Cabinet Of Lhb Type Ac Coaches. Accepted Make & Cat No.: As Per Sr. No. 68 Of Rdso Letter No. El/7.1.108/Mssbc, Dated 17.09.2021, [ Warranty Period: 30 Months After The Date Of Delivery ] ]