The PSEUDO and POTCAR files generated by rhfsps and fourpot3 contain a default energy cutoff, which might be used for the calculations with VASP. The default cutoff guarantees reliable calculations, with errors in the eigenvalues smaller than mRy (i.e. meV, for elements the error is usually much smaller). This is sufficient as long as the stress tensor is not important, because Pulay contributions are usually not negligible for this cutoff. (increase the cutoff by a factor of 1.5 if Pulay contributions should be avoided).
The default energy cutoff works only for US-PP constructed with the RRKJ scheme. The default cutoff is proportional to the square of the highest expansion coefficient used in the RRKJ scheme[18,43].