Kind attention: purchase manager dear sir, we are pleased to introduce ourselves in your esteemed organization as one of the leading manufacturers of hdb (horizontal double brake), vdb (vertical double brake) isolators in range of 11kv, 33 kv, 66 kv, 145 kv, 245 kv and hcb in various current ratings. tritech corporation a iso 9001-2008 certified company is involved in manufacturing of isolators which are type tested as per is/iec standards at cpri, erda. we assure best quality in