  We study charge transport in a single-electron transistor implemented as an
interferometer such that the Coulomb blockaded middle island contains a
circular chiral Majorana or Dirac edge mode. We concentrate on the regime of
small conductance and provide an asymptotic solution in the limit of high
transport voltage exceeding the charging energy. The solution is achieved using
an instanton-like technique. The distinctions between Majorana and Dirac cases
appears when the tunnel junctions are unequal. The main difference is in the
offset current at high voltages which can be higher up to $50\%$ in Majorana
case. It is caused by an additional particle-hole symmetry of the distribution
function in the Majorana case. There is also an eye-catching distinction
between the oscillations patterns of the current as a function of the gate
charge. We conjecture this distinction survives at lower transport voltages as
well.
