Mysterious failure of a Siemens mini circuit breaker C6A (5SY41)

From one day to another this mini circuit breaker stopped working, I had been using it wrongly as a on/off switch and was wondering if there was a mechanism inside to disable it after too many on/off switches, as MCBs are only rated for a finite number of operations.

About Mads Barnkob

Electrician, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics.
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2 Responses to Mysterious failure of a Siemens mini circuit breaker C6A (5SY41)

  1. Paulo Brites says:

    Its really a mistery I suggest to compare with a new one to see whats different.

  2. Mads Barnkob says:

    Suggested by commenters on youtube, it could be a missing wear-resistant contact point that was spot-welded to the arm, that has failed and fallen off.

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