The Web Mountain Phase Couplers work with the WMT line of UPB devices to provide coupling between the two phases of a home’s electrical system. The IPC-03 mounts in one slot in a standard electrical wiring box and uses a blank faceplate.  The CPR-01 and IPC-02 mount in a standard J-box located near the electrical service panel.

On rare occasions, the UPB signal strength is not enough to allow for solid transmission throughout the home. In those rare occasions, the installation of one of these devices couples a strong signal from the phase where the UPB transceiver is located onto the weaker phase, thereby improving transmission performance. These devices are typically only needed in larger homes. However, due to the low price, installing one of these phase couplers is a low cost factor of safety for increasing the already high reliability of UPB devices.

The key to the couplers' function is the Universal Powerline Bus technology for communication applications. Use of standard electrical wiring for communication transmission is possible due to lower noise levels, stronger signal strength and improved reliability - surpassing technologies such as X-10, CeBus and others.

UPB technology also allows sufficient individually addressable devices to control the largest residential environment, usually without the need for phase coupling and without affecting or being affected by adjacent home environments.