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US 4,034,360 AGranted
System for disabling the reset circuit of fault indicating means
OwnerEdmund O. Schweitzer, Jr.inventor
Life of this patent
Estimating the term…
Abstract
The reset circuit of a fault indicator is disabled to prevent automatic restoration of the movable target from fault indicating position where it can be observed and manually rest. A manually operable switch is connected across the reset ciruit and its contacts are closed by permanent magnet means or by manually operable switch means.
Claims8
Fault indicating means responsive to flow of fault current in an electrical distribution system comprising:
- indicator means movable from one position to another position on flow of fault current in said system, a trip circuit responsive to flow of fault current in said system to shift said indicator means from said one position to said other position, a reset circuit to shift said indicator means automatically back to said one position on restoration of said system to normal operating condition;
- and manually operable means for disabling said reset circuit to maintain said indicator means in said one position.
Dependencies are inferred from the claim text.