H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/08 (2006.01) H02H 3/00 (2006.01)
Patent
CA 1152627
66 49,050 ABSTRACT OF THE DISCLOSURE A circuit interrupter includes a microprocessor- based trip unit, a numeric display, and a plurality of potentiometers each associated with one parameter of the time-current trip characteristic of the circuit inter- rupter. The trip unit provides a sequential display of the present setting values of the time-current trip char- acteristic parameters. Adjustment of any of the potentio- meters is operable to interrupt the sequential display and to cause the present setting of the parameter associated with the adjusted potentiometer to be displayed. Adjust- ment of the potentiometer to either limit of its travel causes the most conservative setting value for that par- ameter to be selected. A hysteresis feature is provided to require a significant adjustment of the potentiometer before a different parameter setting will be selected. Although the potentiometers are continuously variable, operator adjustment thereof results in the selection of one of eight predetermined discrete values stored in the trip unit.
374748
Elms Robert T.
Engel Joseph C.
Matsko Joseph J.
Mercier Bernard J.
Oldham And Company
Westinghouse Electric Corporation
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