3 phase systems are tricky for the un-electrical people. There are 4 wires needed to deliver the power in a 4800/216system. A wire for each of the 3 phases (120 degrees apart from each other, phase wise) and a neutral wire. There is 416VAC available measured from phase to phase and a neutral wire. This would be called a 240V Wye 3 phase and also a 416V Delta 3 phase circuit. With a balanced load such as a 3 phase load (welder?), the neutral wire carries no load current. From any phase to any other phase, there is 416volts. From any phase to neutral there is 240VAC. Being that the generator is rated 6800Watts, each phase can support, 2267 Watts. either phase (216VAC) to phase, or phase to neutral (240VAC). If you wire the transformer's input wires from phase to neutral, then you would have 240V. A transformer, as mentioned by ngpmike, could half the 240 VAC to 120VAC and at the same time keep the same approximate watt rating. The source mentioned doesn't offer a 416V input and the 240 input with a 120V output. 120V would then be capable of providing 18.8 amps. there is no load protection (fuse/breakers) or electrical outlets. Make sure you plan on adding those.
You might be able to run more than one 120V single phase outputs. But they would have to be separated circuits. There are transformer systems that will convert the 3 phase to single phase (actually 2-phase but that is moot) at a higher output current rating if you are looking for a higher amp circuit. Look up Scott-T transformers. But it would be more $$
Have you got the internal wiring diagram for the generator? You might be able to rewire the generator half of the system to some other configuration, Probably not to single phase.
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