US3566189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker with loosely coupled deenergizing means for high overload currents
Assignee: Airpax Electronics Inc
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Filing: 1969-03-18
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Granted: 1971-02-23
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Expires: 1989-03-18
Abstract
Abstract Disclosed is a circuit breaker in which the current-carrying contacts are mechanically opened in response to a delay induced solid state switch. The line current passes through the primary of a transformer which is mounted on a common core with the transformer secondary and a third winding. The third winding is energized by the switch to open the breaker contacts. High overload currents are coupled directly from the transformer to the breaker mechanism bypassing the delay. Also provided is a ground fault circuit for closing the switch when the line becomes unbalanced.
Inventors
- 👤 Davad H Wilson
- 👤 Lyal N Merriken
- 👤 John R Shand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:34
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/24; H01H71/2472; H02; H02H; H02H3/00; H02H3/08; H02H3/093; H02H3/10; H02H3/105; H02H3/26; H02H3/32; H02H3/33; H01H71/2481
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A circuit breaker comprising a pair of contacts, a transformer having its primary coupled in series with said contacts, means including a collapsible toggle for opening and closing said contacts, a solid state switch coupled to the secondary of said transformer, the windings of said transformer being loosely coupled to said toggle whereby said toggle is collapsed only in response to excessive overload currents passing through said transformer primary, a third winding more tightly coupled to said toggle, and means coupling said switch to said third winding whereby said third winding acts to collapse said toggle when said switch is closed.
Claim 2
Dependent Claim
101 words
A circuit breaker comprising a pair of contacts, a transformer having its primary coupled in series with said contacts, means including a collapsible toggle for opening and closing said contacts, a solid state switch coupled to the secondary of said transformer, the windings of said transformer being loosely coupled to said toggle whereby said toggle is collapsed only in response to excessive overload currents passing through said transformer primary, a third winding more tightly coupled to said toggle, and means coupling said switch to said third winding whereby said third winding acts to collapse said toggle when said switch is closed.
Claim 3
Dependent Claim
22 words
A circuit breaker according to claim 1 including an adjustable RC delay circuit coupling the secondary of said transformer to said switch.
Claim 4
Dependent Claim
35 words
A circuit breaker according to claim 2 wherein said transformer primary and secondary and said third winding are wound about a common core, said core having a hollow portion at its end adjacent said toggle.
Claim 5
Dependent Claim
28 words
A circuit breaker according to claim 2 including a second solid state switch coupled to said delay circuit for discharging said delay circuit when said contacts are opened.
Claim 6
Dependent Claim
48 words
A circuit breaker according to claim 2 including a ground fault circuit having its output coupled to said switch, said ground fault circuit comprising a toroidal transformer having a pair of single turn primary windings, and a differential amplifier and rectifier coupling said toroidal transformer to said switch.
Claim 7
Dependent Claim
27 words
A circuit breaker according to claim 1 including two pairs of coNtacts forming a pair of circuit breaker switches, said switches being mechanically ganged for simultaneous operation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |