Patent US3745369A successfully refreshed from Google Patents.
US3745369A
Expired / Lapsed
US
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Circuit breaker
Assignee: Mitsubishi Electric Corp
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Filing: 1972-06-05
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Granted: 1973-07-10
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Expires: 1992-06-05
Abstract
Abstract A circuit breaker includes the series combination of a breaker element and a self-restoring type current limiter in a feeder circuit. The self-restoring type current limiter responds to the current of the feeder circuit. A relay is provided and responds to the voltage between both of the terminals of the selfrestoring type current limiter so as to cause a breaking operation of the breaker under abnormal operating conditions.
Inventors
- 👤 Kiyoshi Yamagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:04
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/1045; G; G01; G01N; G01N27/00; G01N27/62; G01N27/68; G01N27/70; H02; H02H; H02H3/00; H02H3/02; H02H3/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A circuit breaker which comprises: a breaker in a feeder circuit which is located between a power source and a load; a self-restoring type current limiter located in said feeder circuit and which responds to the current thereof; and, a relay for responding to the voltage across said self-restoring type current limiter to break said breaker under abnormal operating conditions; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an overcurrent condition, and condenses after said overcurrent condition is removed.
Claim 2
Dependent Claim
88 words
A circuit breaker which comprises: a breaker in a feeder circuit which is located between a power source and a load; a self-restoring type current limiter located in said feeder circuit and which responds to the current thereof; and, a relay for responding to the voltage across said self-restoring type current limiter to break said breaker under abnormal operating conditions; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an overcurrent condition, and condenses after said overcurrent condition is removed.
Claim 3
Dependent Claim
112 words
A circuit breaker which comprises: a breaker having a mechanism for operating an outgoing means by excitation or extinction of an excitation coil; a self-restoring type current limiter connected in series to said breaker; and, a relay connected in parallel to said self-restoring type current limiter, said relay being connnected to said coil of said outgoing means in order to electrically detect a current limiting operation of said self-restoring type current limiter and in accordance therewith to operate to cause said breaker to break; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an overcurrent condition, and condenses after said overcurrent condition is removed.
Claim 4
Dependent Claim
112 words
A circuit breaker which comprises: a breaker having a mechanism for operating an outgoing means by excitation or extinction of an excitation coil; a self-restoring type current limiter connected in series to said breaker; and, a relay connected in parallel to said self-restoring type current limiter, said relay being connnected to said coil of said outgoing means in order to electrically detect a current limiting operation of said self-restoring type current limiter and in accordance therewith to operate to cause said breaker to break; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an overcurrent condition, and condenses after said overcurrent condition is removed.
Claim 5
Dependent Claim
48 words
The circuit breaker of claim 2, wherein said self-restoring current limiter is made of an alkali metal, wherein said relay includes a detecotr coil which is connected across said self-restoring type current limiter and wherein said outgoing means is operated by a voltage generated in said detector coil.
Claim 6
Dependent Claim
108 words
A circuit breaker which comprises: a first circuit for connecting a breaker and a self-restoring type current limiter in series between a power source terminal and a load terminal; and, a second circuit for connecting a detecor coil of a relay which is connected in parallel to said self-restoring type current limiter of the first circuit and an operation switch which is operated by a voltage of the detector coil fo said relay and a voltage-outgoing means of said breaker; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an over-current condition, and condenses after said overcurrent condition is removed.
Claim 7
Dependent Claim
108 words
A circuit breaker which comprises: a first circuit for connecting a breaker and a self-restoring type current limiter in series between a power source terminal and a load terminal; and, a second circuit for connecting a detecor coil of a relay which is connected in parallel to said self-restoring type current limiter of the first circuit and an operation switch which is operated by a voltage of the detector coil fo said relay and a voltage-outgoing means of said breaker; wherein said self-restoring type current limiter comprises an electrically conducting material which, due to Joule-heat, vaporizes during an over-current condition, and condenses after said overcurrent condition is removed.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |