Over Current Protection of Semiconductor by Fuse

  • The fault current flows through power converter due to short circuit, surge current or over load condition. 
  • The semi conductor device may damage due to increase of temperature due to fault current.  
  • The power diodes and SCRs are protected by using fuse in series with supply system. 
  • The fast acting fuse is used in place of glass fuse generally. 
  • The SCR is protected against fault current by using series fuse connection as shown in the figure B. 

Advantages of Fuse Connection in Series With SCR 
  • There is co – ordination between semi conductor device and fuse is done.
  • Only one SCR is isolated from power converter if there is fault in single SCR.

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