Diode, Silicon - Free Wheeling - 840 Rev. Volts Rms - 250 Amp Forward To Emd Part No. 8452952 And To Dlw Part No. 18380128 For Wdp4/Wdg4 Locos, Dlw Drg.No.8452952 Alt.Ba. [ Warranty Period: 30 Months After The Date Of Delivery ] ]