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High current connectors...

Discussion in 'Electronic Basics' started by M. G. Devour, Dec 24, 2003.

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  1. M. G. Devour

    M. G. Devour Guest


    Does anyone know what sort of peak or sustained current Superior Electric
    Supercon(tm) connectors can carry if they are *not* asked to interrupt a
    live circuit?


    I need them to carry 12VDC, 75A pulses at a duty cycle less than 25% and
    will *not* disconnect while hot. The 100 amp connectors look to me to be
    gross overkill, and I'm wondering if the 50 or 25 amp units can handle this

    I've had no luck finding a data sheet for these on-line. Given the holidays,
    it'd be a while before I could order one up from Superior, so thought I'd
    ask here.


    Mike D.
  2. Well if volt drop is not a problem (details of use not given) at that duty
    cycle I'd go the 50's, mebbe try a few 25's and see !!
  3. CFoley1064

    CFoley1064 Guest

    Hi, Mike. Supercons are not made to interrupt a live circuit -- their rating
    isn't like switches, which have a switching current rating and a holding
    current rating. It's basically just I^2*t here. The peak heating power being
    dissipated by the resistance of the connector contact is a function of the
    square of the current, so if you're going to have 3 times current or nine times
    power, it should be a duty cycle of around 11%. That would technically put
    your 25A Supercons out of the running, but would open up room for the 50s --
    1.5^2 * .25 duty cycle = .55 rated power. The good, conservative choice would
    be the 50A Supercons.

    Having said that, I don't see much of a practical problem with what you're
    doing, unless this is for a medical or life support application.You're getting
    them new, you're going to keep them in a relatively cool non-humid environment,
    you're going to keep the pin and receptacle clean and burnished, right? Also,
    you're not going to be going crazy with a lot of insertion/extraction cycles,
    right? That degrades the contact resistance of the receptacles as much as
    anything else.

    Give yourself points for these things. Seriously, I've seen Supercons fail
    (charring/discoloration of receptacle plastic is usually a good sign), and
    usually the culprit is at least one of the above along with high current. New
    and with only a reasonable number of insertion cycles, they're way underrated
    at 25A.

    Go for it, and Merry Christmas.
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