I'm having a PC SMPS with its bridge blown off leaving diodes conducting both ways.. The 4 diodes used were RL205 having a rating of 2A 600V reverse blocking. Can I replace them with 1N5402 Diodes, as they have 3A but only 200V reverse.. I guess when 2 of them come in series during a rectification phase would make it work at 250VAC or would it short ?

 

Hello,

I think it is not a good idea to use the 1N5402.(they will probably break).
Better use a higher voltage rating.
You can better use the 1N5406 (600 Volts) or 1N5408 (1000 volts).
Also take a look why the diodes got broke.
Is there a short behind the diodes?

Greetings,
Bertus

 

You can use diodes with a peak reverse voltage of 600V or more than 600V.