supply of three phase voltage monitoring relaythree phase voltage monitoring relay, three phase voltage monitoring relay ( ht mmr ) 750 v ac aux voltage 24-60v ac / dc , 50 hz, as per annexure-a item no. 22 & 23 of edts 355, rev-01 or latest. conf . to rdso spec. no . rdso / pe / spec / ac / 0184-2015 ( rev-0 ) or latest.suitable for switch board cabinet of lhb type eog ac coaches. make - dold / carlo gavazzi / abb only. note:- supplier should be submit oem / dealership certificate or purchase challan of authorized dealer along with supply of material. [ warranty period: 30 months after the date of delivery ] => limited