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How does a blown fuse indicator work?

how does the blown fuse indicator function? 

Product Line:
Terminal Fuse Blocks

Applies to blown fuse indicators by SquareD/Schneider Electric

The blown fuse indicator is connected in parallel with the fuse. When the fuse is good all current travels through the fuse. When fuse is blown current flow through the blown fuse indicator and it is illuminated.

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