The HAI UPB™ Three-Phase Repeater (TPR) is a small electronic device that enables communication between devices using the Universal Powerline Bus (UPB™) method of communication (such as HLC devices) on a three-phase 120/208VAC delta-wye, 60Hz powerline. The main purpose of the TPR is to transfer UPB™ multi-packet messages transmitted on one phase (leg) of the electrical system and strongly repeating them on to the other phases (legs) to ensure proper communication.

UPB™ communication was designed to work on a single phase powerline. In a three-phase environment, the signals will not directly jump across all three phases of a 120/208V electrical system. The TPR is designed to take any UPB™ multi-packet generated signal on a single phase and repeat them onto all three phases of the powerline.