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Contact resistance critera/passing range (low voltage air circuit breakers)

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    Contact resistance critera/passing range (low voltage air circuit breakers)

    Good Day!

    What is the criteria/passing range and standards for the Contact Resistance Test of Low Voltage Air-Circuit Breaker?

    Specs:
    ABB Manufactured with Iu=1600A, Ue=690V , 3 phase.....

    Among the 4 units I tested for its contact resistance, 3 of it has a higher values. Injected current is 100A AC.
    ACB #1 : 1435 micro ohms ; 1331 ; 847.7
    ACB #2 : 269.6 ; 790 ; 670.8
    ACB #3 : 22.8 ; 22.4 ; 22.3
    ACB #4 : 40.0 ; 39.6 ; 36.5

    Note that all ACB were at the same specs....


    Thank you.

    Godbless.

    Regards,
    Rizza

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    Greetings Rizza! All three pases should be within 50% of the lowest value.

    Example: 22.3 being lowest value, contacts should not be higher than 33.45 (22.3 x 1.5).

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    at 100 amps...i would give those first two a good cleaning..should drop significantly

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    @Sanjayo

    Thanks a lot. . .

    Is that from NETA standard?

    Regards,
    Rizza

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    Yes, the +/- 50% rule comes from NETA. Are these new breakers?

    Quote Originally Posted by rizza_gay View Post
    Thanks a lot. . .

    Is that from NETA standard?

    Regards,
    Rizza

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    Hello . . . .

    Quote Originally Posted by rizza_gay View Post
    Thanks a lot. . .

    Is that from NETA standard?

    Regards,
    Rizza

    Yes...those were new ACB. . .

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    Good Day!

    Quote Originally Posted by Sanjayo View Post
    Yes, the +/- 50% rule comes from NETA. Are these new breakers?
    Yup...All breakers were new. One thing I've noticed is that the breakers were in Open Position before I conducted the test. Maybe, the presence of dusts in its contact matters.

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    What kind of instrument are you using to measure?

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    Quote Originally Posted by Sanjayo View Post
    What kind of instrument are you using to measure?
    Its the DV Power CAT66 : Circuit Breaker Analyzer

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    Quote Originally Posted by rizza_gay View Post
    Its the DV Power CAT66 : Circuit Breaker Analyzer
    Did you say this was 100A ac? Using Dc current would give more stable reading.

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