  We show that in 3-3-1 models there exist a natural relation among the
$SU(3)_L$ coupling constant $g$, the electroweak mixing angle $\theta_W$, the
mass of the $W$, and one of the vacuum expectation values, which implies that
those models can be realized at low energy scales and, in particular, even at
the electroweak scale. So that, being that symmetries realized in Nature, new
physics may be really just around the corner.
