Better than a Mosfet for switching high voltage currents is the IGBT, insulated gate bipolar transistor, I think BUP304 is a popular type. Justin G -----Original Message----- From: Alan B. Pearce [mailto:A.B.Pearce@RL.AC.UK] Sent: Friday, 19 July 2002 19:24 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE]: MOSFETS >This will use a 1500v 6A >MINIMUM rated switching transistor. To switch a >100v rail! And they are still somewhat unreliable, >even with snubbers and damping all over the place >keeping the max volts down. I certainly would not want to be around when the almost inevitable (at some stage) failure occurs connecting +340V battery terminal to -340V battery terminal through short circuited fets, bearing in mind that (as I understand it) they will be series connected car batteries :)))))) Now where is that nuclear bunker :))) -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body