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Thread: inrush current

  1. #1
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    inrush current

    Hello every body.

    We have a case in our project that the supplier of lighting control system want to change the MCB from 16 to 20 amps as result of changing the light fixtures from fluorescent to led due to higher inrush current of the new one, is it correct?

    Thanks in advance for your feedback.

  2. #2
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    This article may be of some use to answer your question:

    http://www.wseas.us/e-library/confer...SYSTEMS-52.pdf
    Electricians do it until it Hertz!

  3. #3
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    Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.
    I will have achieved my life's goal if I die with a smile on my face.

  4. #4
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    Quote Originally Posted by JFletcher View Post
    This article may be of some use to answer your question:

    http://www.wseas.us/e-library/confer...SYSTEMS-52.pdf
    Thanks a lot for providing me proper answer.

  5. #5
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    Quote Originally Posted by Smart $ View Post
    Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.
    Thanks, but as the information we got from the supplier that it happens before with them specially when dealt with LED.

  6. #6
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    Quote Originally Posted by Smart $ View Post
    Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.
    Don't they have a magnetic trip also?
    Si hoc legere scis nimium eruditionis habes.

  7. #7
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    Quote Originally Posted by Besoeker View Post
    Don't they have a magnetic trip also?
    Typical inverse time breaker over here has a thermal magnetic trip mechanism. Still far from instantaneous.

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    Source: http://www.eaton.com/ecm/groups/publ...b01200003e.pdf
    I will have achieved my life's goal if I die with a smile on my face.

  8. #8
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    More examples of time current curves...

    http://www.geindustrial.com/your-bus...current-curves
    I will have achieved my life's goal if I die with a smile on my face.

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