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.

Mads Barnkob

Electrician, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of https://kaizerpowerelectronics.dk and the high voltage community forum https://highvoltageforum.net

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2 thoughts on “Mysterious failure of a Siemens mini circuit breaker C6A (5SY41)

  1. 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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