The three-phase PDUs (both the high-voltage and low-voltage versions) are not supported in the Sun Rack II 1042. If your equipment requires a three-phase PDU, use the Sun Rack II 1242 instead.
Additionally, select the appropriately sized rack for the equipment you plan to install. You might need to select the deeper Sun Rack II 1242 if you plan to install large equipment or equipment that requires a large amount of cabling.