how to create design load switch using MOSFET for 400V 10A resistive load.

Hi Smith,

Welcome to E2E.

We don't have controllers to support 400V. You can implement using discrete components (similar to Figure-1 in https://www.ti.com/lit/an/slva862a/slva862a.pdf)

Can you share the application use case, end product.

Best Regards, Rakesh