Voltage-current characteristics (VCC) of multifilamentarY Nb3Sn wire a
t magnetic fields up to 8 T and temperatures up to 17K are presented.
The VCC are exponential in the studied interval of magnetic fields and
temperatures . The dependences of J(c)(B,T) and J(o)(B,T) were derive
d. The results obtained are explained by the presence of Nb3Sn compone
nts that differ in critical parameters.