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DPDT relay lifespan.

Discussion in 'Sensors and Actuators' started by HellasTechn, Dec 13, 2019.

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  1. HellasTechn

    HellasTechn

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    Apr 14, 2013
    Good day everyone.
    I have a question concerning some relays i use for a project.
    I have been searching the datasheet to find the average lifespan in hours of the relays coil under DC voltage.
    The relay i use is the SCHRACK RT424012 and the voltage applied on its coil is 12V.
    Here is a link to the datasheet from mauser:
    https://gr.mouser.com/datasheet/2/418/NG_DS_RT2_1014-728950.pdf
    On page 1 i found the following but im not sure this is what im looking for or even if it is im still not sure how to read it.

    Frequency of operation, with/without load
    DC coil 360/72000h-1
    AC coil 360/36000h-1

    THANK YOU.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    The lifetime of relationship is typically specified by the number of cycles under certain conditions (typically voltage switched).

    This is because physical operation is limited by wear, and the ability to form (and break) a good connection is determined by the contacts (and they are incrementally degraded when you're switching higher voltages or inductive loads)
     
  3. HellasTechn

    HellasTechn

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    Apr 14, 2013
    I think i understand what you say. In my case though i am not concerned about the relay contacts.
    I am looking for the relay's coil lifespan. In other words what im looking for is how many hours can it continusly be energized under 12V (with or without load on the relay's contacts) before it fails.

    Does the load on the relay contacts affect the lifespan of the relay's coil ?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,374
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    Jan 21, 2010
    The coil should have an indefinite lifetime, assuming it is rated to be powered continuously (and if it wasn't it would be in the datasheet).

    In high vibration environments, it is conceivable that the coil could fail, but that would be independent of it being powered. Similarly, in a high temperature environment the power dissipated in the coil could cause problems, but that would likely mean you're operating it at a temperature outside the specs.

    The coil just isn't going to wear out with use.
     
  5. HellasTechn

    HellasTechn

    1,524
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    Apr 14, 2013
    I understand. Thank you.
     
  6. duke37

    duke37

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    Jan 9, 2011
    Keeping the coil warm in a damp environment should extend its life.
     
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