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, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of and the high voltage community forum
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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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