Supply Of 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, As Per Item No. A-2, Of Rdso Spec No. Rdso/pe/spec/ac-0184-2015 Rev.1 & Place Of Installation S1a7, Used For Insulation Control 415v Of Lhb Type Ac Coaches, Confirming To Rdso Spec. No. Rdso/pe/spec/ac-0184-2015 Rev.1 Suitable For Switch Board Cabinet Of Lhb Type Ac Coaches. Accepted Make As Per Sr. No. 68 O Rdso Letter No. El/7.1.108/mssbc Dated 17.09.2021..