Failed elevator switch fuse / fusible disconnect

This is a common industrial grade switch-fuse unit used for isolation and protection. The unit in this video had failed, so I thought it would be interesting to see what had gone wrong.

Note that the failed module also had a loose bit of plastic in it, and that may have contributed to the unusual failure.

The contacts are notable for having a ball joint effect at one end, which ensures they always sit flat on the other contact. The spring loaded mechanism is basically two very powerful springs acting as an over centre toggle which will snap open and closed with force, rotating the common switch operation bar.

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