The 63200 DC Load is a LOAD. The Load gets its current from the source that is hooked to the LOAD Connections. The 120/240 Vac input to the load is only used to power the Fans, and Bias Power Supply to control the Load and does not require power greater than 150Watts. The Power is from what ever source your customer is attaching to the Load Terminals.
No, it doesn't need a 3-phase connection. It's a simple NEMA plug.