Is 3-phase AC available in the US for the Any-Grid PSW-H?

The Any-Grid PSW-H is a single-phase device and several of them can interconnect to have either single-phase (parallel), 3-phase or split-phase (only 120 Vac models) systems. For 120 Vac per phase and for split-phase systems, be sure to choose the 120 Vac version of the PSW-H. Split-phase/2-phase with 180° phase shift requires at least 2 devices and 3-phase requires 3 devices. Single-phase only requires at least one device.