  We discuss the main features of the scalar sector of a class of BSM models
with enlarged gauge symmetry, the so called 331 Models. The theoretical
constraints on the scalar potential such as unitarity, perturbativity and
boundedness-from-below, are presented, together with the analytical exact
digitalization of the scalar sector. The phenomenology of exotic scenarios
predicted by the 331 Models can be tested in light of these theoretical
constraints.
