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Electrical switching device or trip unit acquiring predetermined settings from another electrical switching device or trip unit

  • US 6,005,757 A
  • Filed: 05/11/1998
  • Issued: 12/21/1999
  • Est. Priority Date: 05/11/1998
  • Status: Expired due to Term
First Claim
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1. A pair of substantially similar electrical switching devices comprising:

  • a first electrical switching device having at least one predetermined setting;

    a second electrical switching device; and

    a communication channel interconnecting said first and second electrical switching devices,with each of said first and second electrical switching devices comprising;

    separable contacts,operating means emnloving a trip signal to open said separable contacts,means for sensing at least one electrical condition operatively associated with said separable contacts, anda trip unit comprising;

    memory means for storing at least one predetermined value,means for providinp the trip signal to said operating means as a function of said at least one sensed electrical condition and said stored at least one predetermined value, andmeans for communicating with another electrical switching device by employing said communication channel, andwith the trip unit of said second electrical switching device further comprising;

    means cooperating with said means for communicating with another electrical switching device for transferring said at least one predetermined setting from said first electrical switching device,means for receiving said transferred at least one predetermined setting from said means for communicating with another electrical switching device, andmeans for storing said received transferred at least one predetermined setting in said memory means as said at least one predetermined value,wherein said at least one predetermined setting is a plurality of predetermined settings;

    wherein said at least one predetermined value is a plurality of predetermined values;

    wherein the memory means of the trip unit of said first electrical switching device stores a plurality of first operating values as the predetermined values of the last said memory means;

    wherein the memory means of the trip unit of said second electrical switching device stores a plurality of second operating values as the predetermined values of the last said memory means;

    wherein said means for communicating with another electrical switching device of the trip unit of said second electrical switching device includes means for requesting said first operating values from said first electrical switching device; and

    wherein said means for communicating with another electrical switching device of the trip unit of said first electrical switching device includes means for responding to said second electrical switching device with said first operating values.

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