We present a search for excited electrons, neutrinos and quarks using
the H1 detector at the ep collider HERA, based on data taken in 1994 w
ith an integrated luminosity of 2.75 pb(-1). Radiative decays of excit
ed quarks and neutrinos have been investigated as well as decays of ex
cited electrons into all possible electroweak gauge bosons. No evidenc
e for new particle production is found and exclusion limits are derive
d.