Relay Contact Wetting

Discussion in 'General Electronics Chat' started by kruger1, Jan 24, 2006.

  1. kruger1

    Thread Starter New Member

    Jan 24, 2006
    I know roughly what contact wetting is but, how is it physically acheived in the context of a circuit. I have an applicaton where I need to "wet" a relay contact with minimum load current of 10mA. How is it done?
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    Wetting current is a consequence of the physical contact design. If 10mA is below the wetting current of your relay contacts, then you need a different relay.

    Gold plated contacts have very low wetting currents.
  3. aac

    Active Member

    Jun 13, 2005

    If your relay specification says it needs 10 mA wetting current, you may not have to do anyting. I'll make some assumptions to illistrate. If you have a 12V system and the relay load is 1K, then your current is 12 mA and you don't have to do anything. If your load was 2K, then your current is 6 mA and you must select a different relay or change the circuit to get more current. You could just add some resistance in parallel with the load to get more current through the relay contacts.