In this paper, the authors try to design and implement the logic of a fuzzy MUltipleXer (fMUX) system. A design of fuzzy multiplexer is presented and its generalization to classical logic has been shown with simulations. In fuzzy modelling, a fuzzy MUltipleXer (fMUX) acts as a fuzzy switch to select one of the fuzzy inputs. Selection of the inputs is determined by the value of candidate inputs termed as "Select inputs". These fMUX's could be used as generic building modules in fuzzy systems. All simulations were done using MultiSim 11.0.