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US4051544A Expired / Lapsed US ⏱️ 0.0 years remaining

Fail-safe ground fault receptacle circuit

Assignee: GTE Sylvania Inc
•
Filing: 1976-03-23
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Granted: 1977-09-27
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Expires: 1996-03-23
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Abstract

Abstract A fail-safe ground fault receptacle circuit includes a ground fault circuit interrupter inductively coupled to a load, directly coupled to one potential source terminal, and coupled by way of a series connected solenoid winding and contacts of a circuit breaker shunted by a series connected impedance and indicating lamp to another potential source terminal whereby manually closing the circuit breaker causes current flow through the solenoid winding shunting the indicator lamp and preventing activation thereof and excessive current flow through the solenoid winding opens the circuit breaker to cause current flow through and activation of the indicating lamp.

Inventors

  • 👤 Edward J. Vibert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:58
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/26; H02H3/32; H02H3/33

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 204 words
A fail-safe ground fault receptacle circuit comprising: a pair of parallel connected female contacts formed to receive an electrical load; a GFCI unit; a potential source having first and second input terminals; circuit means including a series connected impedance and indicating lamp coupling said first input terminal of said potential source to said GFCI unit and conductor means directly connecting said second input terminal of said potential source to said GFCI unit; and circuit breaker means including a plurality of ganged contact members and a solenoid winding, one of said contact menbers selectively coupling said first input terminal of said potential source to said solenoid winding coupled to said GFCI unit, another of said contact members selectively coupling said first input terminal of said potential source to said female contacts and another of said contact members selectively coupling said second input terminal of said potential source to said female contacts whereby manually activating said circuit breaker means causes activation of said GFCI unit by current flow through said solenoid winding and de-energization of said indicating lamp and a ground fault causes activation of said GFCI unit which short circuits said solenoid to activate said circuit breaker and cause current flow through said indicating lamp.
Claim 2
Dependent Claim 204 words
A fail-safe ground fault receptacle circuit comprising: a pair of parallel connected female contacts formed to receive an electrical load; a GFCI unit; a potential source having first and second input terminals; circuit means including a series connected impedance and indicating lamp coupling said first input terminal of said potential source to said GFCI unit and conductor means directly connecting said second input terminal of said potential source to said GFCI unit; and circuit breaker means including a plurality of ganged contact members and a solenoid winding, one of said contact menbers selectively coupling said first input terminal of said potential source to said solenoid winding coupled to said GFCI unit, another of said contact members selectively coupling said first input terminal of said potential source to said female contacts and another of said contact members selectively coupling said second input terminal of said potential source to said female contacts whereby manually activating said circuit breaker means causes activation of said GFCI unit by current flow through said solenoid winding and de-energization of said indicating lamp and a ground fault causes activation of said GFCI unit which short circuits said solenoid to activate said circuit breaker and cause current flow through said indicating lamp.
Claim 3
Dependent Claim 30 words
The fail-safe ground fault receptacle circuit of claim 1 wherein said solenoid winding has an impedance value less than the impedance value of said series connected impedance and indicating lamp.

References Cited (Backward Citations)

US3633070A Cited
US3633070B1 Cited
US3813579A Cited
US3852642A Cited
US3806764A Cited
US3879639A Cited
US3931601A Cited
US3973171A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-09-26 1981-03-28 1981-09-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-09-26 1985-03-28 1985-09-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-09-26 1989-03-28 1989-09-27 $7700.00 Window Closed / Lapsed

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