Which AP supports DFS channel when country code is set to USA on AP controller?

Zyxel_Bella

DFS channels support is available on specific models only. 

DFS is supported on:

WAC6502D-E / WAC6502D-S / WAC6503D-S / WAC500 / WAC500H / WAX6303D-S / NWA5123AC-HD / WAX650S / WAX630S / WAX610D / WAX510D / WAX640S-6E / WAX620D-6E / WAX655E