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Would like help on Mosfet DC switching ,

 Hi I would like to switch 250 - 350 v DC at 40 amps with a 5 v gate voltage ( opto isolated ), ( micro processor controlled  100 - 1024 kHz switching maybe )

I need advice on the Mosfet ( or another device)  I should use and a sample circuit , or a discussion on why it should or cant be done ,