BY An N-shaped negative differential resistance (NDR) in semiconducting ferromagnetic spinel CdCr2Se4 has been found in /I/. Earlier investigations have demonstrated that the NDR in n-type CdCr2Se4 depends on the donor doping concentration, ambient temperature, and applied magnetic field /2, 3/. A switching effect being conditioned by the S-shaped NDR in CdCr2Se4 has been observed in 14, 5/, therefore we have predicted a similar phenomenon based on N-shaped MDR.Our note contains some experimental results in this direction. The CdCr Se single crystals doped with 3, 7, and 1 0 mol% In were grown by the chemical vapour transport technique. Ohmic contacts have been obtained by Ag paste on the samples with thickness about 0.05 cm and subelectrode area about 0.15x0.15 c m . 2 4 2 The experiments have been performed at a temperature of 77.4 K in an electric circuit comprising a linear resistor R1 and our sample Rs.conductive one (LCS) has been found (Fig. 1). The resistance change at switching of 7 mol% In doped CdCr2Se4 sample was equal to 1 .lxlO at the loading resistor R = 6 . 2~1 0 Q and 3 . 0~1 0 at R = 3 . 3~1 0 a . The same parameter was 1 equal to 1 . 2~1 0 at 9 = 3 . 6~1 0 D for a sample with 3 mol% In and 1 . 3~1 0 at R1 = 6 . 0~1 0 Sl for a sample with 1 0 mol% In. The threshold electric field Es depended on the indium content and was minimum for CdCr2Se4 doped with 7 mol% In: Es = 1 . 1 2~1 0 V/cm. The reverse switching on this sample took place at another value of Es which depended on the magnitude of 9 (Es changed 3 3 3 from 1.6 7x1 0 to 1.24xlO V/cm when R1 has been decreased from 6 . 2~1 0 to 3 . 3~1 0 a ) .