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A multicomponent, phase-field model is applied to a ternary Fe-C-Mn alloy in directional dendritic growth. The system is studied with respect to the influence of kinetics, thermodynamics and their interaction. In order to separate both effects ternary simulations with realistic diffusion and phase diagram data are compared to simulations with idealized pseudobinary data. The investigation contributes to the question, under which conditions pseudobinary or binary equivalent models are able to recover the multicomponent growth behaviour. Special interest is given to tip selection, microsegregation and primary spacing. The results of the direct dendritic simulation will give some answers to the question, wether there is a fundamental difference between binary and ternary alloys.