How relay contact materials influence performance?

Discussion in 'General Technical Questions and Answers' started by LUKE_BARBER70, Jan 15, 2020.

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    LUKE_BARBER70 QRZ Member

    I want to allow 230V, 40A through an element, which relay contact material will withstand. Please suggest.
  2. VU2NAN

    VU2NAN Ham Member QRZ Page

    Your question is not very clear.

    However if your requirement is to switch 230V, 40A DC or AC, then you would require either a DC or an AC power contactor, rated to perform that task.


  3. KF5LJW

    KF5LJW Ham Member QRZ Page

  4. KA9JLM

    KA9JLM Ham Member QRZ Page

    You need a Contactor Relay.

    Chromium plated contacts.
  5. K8ERV

    K8ERV Ham Member QRZ Page

    As I recall silver-cadmium-oxide contacts prevent welding together.

    TOM K8ERV Montrose Colo
  6. AA7QQ

    AA7QQ Ham Member QRZ Page


  7. K8ERV

    K8ERV Ham Member QRZ Page

    You expected less?

    TOM K8ERV Montrose Colo
  8. AA7QQ

    AA7QQ Ham Member QRZ Page

    Of course not, you conceited old fart.... ;-)

    WR2E likes this.
  9. NE4EB

    NE4EB XML Subscriber QRZ Page

    You don't care. At all. You are just purchasing a commercial contactor with those exact ratings. The manufacturer will take care of the composition of the contacting elements because, warranty.

    Do not homebrew this item. Rip one out of a scrapped motor control center if you can't afford new. Fires, arc flash and such just aren't worth saving a few bucks around things like this.
    AG6QR likes this.
  10. K8ERV

    K8ERV Ham Member QRZ Page

    I llike complements--

    TOM K8ERV Montrose Colo
    AA7QQ likes this.

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