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The $Ta-Cu$ and $NbS{e}_{2}-Cu$ heterocontacts have been studied. For $Ta-Cu$contacts the theoretical estimation of the value of $\delta$-functional barrierat the boundary arising due to the mismatch of Fermi parameters of thecontacting metals was carried out and a good agreement between the calculationand experiment was obtained. An expression for the estimation of the diameterof the heterocontact on either side of the boundary is obtained. The magnitudeof the jump-like decrease in the excess current (and the superconducting gap)due to the phase transition of the superconductor region near the point contactinto a spatially inhomogeneous state when the critical concentration ofnonequilibrium quasiparticles is reached has been determined. Obtaineddependence of the additive differential resistance on the offsets at thecontact arising after the phase transition, due to the excess charge ofquasiparticles and the associated reverse current (or additive voltage). In$2H-NbS{{e}_{2}}$ there is a two-zone superconductivity character with $\sim$8times different energy gap values. Under the influence of current injection ofnonequilibrium quasiparticles there is a sequential phase transition of thelayers adjacent to the point contact into a spatially inhomogeneous state witha suppressed gap, which is accompanied by a step change in the slope of the$I-V$ curve with a discrete increase in the differential resistance.

Nonequilibrium effects in ballistic point contacts $Ta-Cu$ and $2H-NbS{{e}_{2}}-Cu$. Two-gap superconductivity in $2H-NbS{{e}_{2}}$