(Updated as of 7/12/17)
The current power supply to use with an FCS WM is the PS50X. The key thing to note is that at this time, the customer needs to provide their own NEMA1 enclosure.
The former power supply for the FCS WM (FCS WM PS30) was a repackaged version of the Lambda 30-24/277A pictured below. This has been discontinued as of June 15th, 2017.