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Higher current in relay resistive load compared to inductive load

Discussion in 'General Electronics Discussion' started by kevit, May 30, 2014.

  1. kevit

    kevit

    2
    0
    May 30, 2014
    Hi, I have a question that I have been trying to figure out.

    I just come across 2 relay life cycling graphs, 1) for resistive load, 2) inductive load.
    Assuming the relay, voltage (DC) is the same, just wondering why the current for the inductive load graph is always lower than the resistive load. e.g. 120Vdc / 0.35A, L/R=30ms for inductive load, 120Vdc / 0.7A.

    Hope somebody could share their knowledge, many thanks!
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Because when you try to break the circuit with the inductive load the voltage rises far higher than it does when the load is resistive.

    There's lots more arcing and reducing the current makes it easier (in general terms) to extinguish the arc.
     
  3. kevit

    kevit

    2
    0
    May 30, 2014
    Thanks for the information! :)
     
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