- 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.
- 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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