insulation monitoring relay, 415 v ac, 3 phase, neutral isolated, voltage range 0-500 v ac, insulation measuring range: 10 k ohm to 150 k ohm, control volt.: 24-240 v ac/dc, as per page no. 39, s.no. 63, item code: a 2 and place of installation s 1 a 7, of bill o
