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fillet_76
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Join Date: Jan 2012
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Merlin Gerin (MG) Main Circuit Breaker Faulty

03/12/2013 5:09 AM

Dear All,

We have a diesel genset of Caterpillar -725 kVA model 2412. The main circiut breaker got faulty.

MG - C1251N 1250 Amp

Please advise the possible causes of faulty breaker.

Thanks
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PWSlack
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#1

Re: Merlin Gerin (MG) main circiut breaker faulty

03/12/2013 5:24 AM
  1. The first possibility is overload.
  2. The next is water ingress.
  3. A third would be mechanical damage.
  4. Overheating from outside.
  5. Etc., etc.
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PWSlack
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#2

Re: Merlin Gerin (MG) main circiut breaker faulty

03/12/2013 5:55 AM

6. Ingress of foreign objects...

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PeterT
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#3

Re: Merlin Gerin (MG) Main Circuit Breaker Faulty

03/12/2013 7:27 AM

7. Lack of maintenance: cleaning, lubrication, etc...

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Yahlasit
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#4

Re: Merlin Gerin (MG) Main Circuit Breaker Faulty

03/12/2013 8:58 AM

8.- Loose conections causing overheating and metal erosion.

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PWSlack
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#5

Re: Merlin Gerin (MG) Main Circuit Breaker Faulty

03/12/2013 10:21 AM

What's the prize for getting it right? Only, Del the cat wants to know...

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obouill
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#6

Re: Merlin Gerin (MG) Main Circuit Breaker Faulty

03/12/2013 10:44 AM

Main infos needed :

  • ref of the breaker
  • type of network, installation
  • type of failure : "faulty" is a bit vague.

Then I would advise to call the Schneider service center ...if Caterpillar does not answer.
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SHOCKHISCAN
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#7

Re: Merlin Gerin (MG) Main Circuit Breaker Faulty

03/13/2013 12:00 PM

You did not state what type of breaker is in question.

If it is a molded-case type breaker:

Most molded-case circuit breakers are not designed to operate/trip/open more than once under fault conditions.

If this breaker has operated more than once in/under fault condition(s) it must be removed from the application and tested using a certified tester and following the breaker tester IOM instructions.

Not knowing if or how many times the breaker has been "tripped" in/under a fault condition nor the operating environment nor whether it has been properly maintained it is not reasonable nor logical to determine or assume the "Root-Cause" of failure.

All of the posts are excellent information and should be considered.

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obouill (1); PeterT (1); PWSlack (3); SHOCKHISCAN (1); Yahlasit (1)

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