  The present paper studies the Dirac Hamiltonian of a test electron with a
domain of bi-spinor wave functions supported on the static region inside the
Cauchy horizon of the subextremal RWN black hole spacetime, respectively inside
the event horizon of the extremal RWN black hole spacetime.
  It is found that this Dirac Hamiltonian is not essentially self-adjoint, yet
has infinitely many self-adjoint extensions.
  Including a sufficiently large anomalous magnetic moment interaction in the
Dirac Hamiltonian restores essential self-adjointness; the empirical value of
the electron's anomalous magnetic moment is large enough.
  The spectrum of the subextremal self-adjoint Dirac operator with anomalous
magnetic moment is purely absolutely continuous and consists of the whole real
line; in particular, there are no eigenvalues.
  The same is true for the spectrum of any self-adjoint extension of the Dirac
operator without anomalous magnetic moment interaction, in the subextremal
black hole context.
  In the extremal black hole sector the point spectrum, if non-empty, consists
of a single eigenvalue, which is identified.
