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Understanding Contacts on Schneider CT le 16A Contactor with PCU-511 Relay

Fidelis 1161 9
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  • #1 18236446
    Fidelis
    Level 16  
    Understanding Contacts on Schneider CT le 16A Contactor with PCU-511 Relay .

    I do the protection on a PCU-511 time relay and a contactor as shown in the photo (switching off after a set time).

    Can anyone help interpret the purpose of the contacts in the contactor as pictured ? Because I don't think I understand something.
    I am applying voltage to contacts A1 and A2 and the coil is working. However, I try to ring the transitions between contacts R1, R2, 1 and 2 (in various combinations) and .... silence. The contactor straight from the shop.

    What am I doing wrong ?
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  • #2 18236468
    jozgo
    Level 42  
    R1, R2 normally closed NC contact. - Connected when no voltage is applied to the coil.
    Contact 1, 2 - NO - Normally open. Connects when voltage is applied to the coil.
    Diagram on the housing!
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  • #3 18236475
    Fidelis
    Level 16  
    jozgo wrote:
    Schedule on the housing!


    I wanted to make sure. Relax.... I am not so a fool :-) .
    Something is therefore wrong with this contactor.
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  • #4 18236491
    jozgo
    Level 42  
    If, with no voltage on the coil, R1 and R2 are not shorted then it sucks.
  • #5 18236538
    Fidelis
    Level 16  
    R1-R2 is OK. There is no 'expected' transition between 1 and 2 when voltage is applied.
  • #6 18236553
    karel47
    Level 19  
    Fidelis wrote:
    R1-R2 is OK
    .
    This means that when voltage is applied to the coil, R1-R2 opens?
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  • #7 18236797
    Fidelis
    Level 16  
    Exactly right.
  • #8 18236810
    jozgo
    Level 42  
    Well, that's a faulty NO contact.
  • #9 18236819
    karel47
    Level 19  
    If it is as you describe, there is nothing left to do but to complain about it.
    I have used Schneider modular contactors more than once (the iCT series to be precise), and I have not yet had a problem with them.
    Maybe someone has already used it and returned the faulty one to the shop.
  • #10 18236844
    Fidelis
    Level 16  
    karel47 wrote:
    Maybe someone has already used it and returned it damaged to the shop.

    Maybe. The contactor looks new, but one edge (just above the Schneider lettering) was "oddly" scuffed and dirty. Maybe it was actually returned and got misplaced as damaged, as I don't suspect the shop of bad intentions.
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Topic summary

The discussion revolves around the interpretation of contacts on a Schneider CT le 16A contactor used with a PCU-511 time relay. The user is experiencing issues with the contactor, specifically with the transitions between contacts R1, R2, and 1, 2 when voltage is applied. Responses clarify that R1 and R2 are normally closed (NC) contacts, while contacts 1 and 2 are normally open (NO). It is suggested that if the expected transitions do not occur when voltage is applied, the contactor may be faulty. The user suspects the contactor might have been previously returned due to visible scuffing, indicating potential prior use or damage.
Summary generated by the language model.
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