Transzorbs in IGBT circuits

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Original poster: Mr Gregory Peters <s371034-at-student.uq.edu.au> 

Hello all,

Currently constructing and collecting parts for a DRSSTC using "warp" speed 
900v IGBTS, and will have ca. 600v input from rectified 415v two phase 
(240v per phase).

Looking for some guidelines on what kind of transzorbs I should use. I 
assume I want the bidirectional devices right? And maybe about 750-800v 
rating? Do these things come in different speeds? What speed should I use? 
Any advice on wattage ratings would also be most useful.

Cheers,

Greg Peters
Department of Earth Sciences,
University of Queensland, Australia
Phone: 0402 841 677
http://www.geocities-dot-com/gregjpeters