GB664963A - Improvements in or relating to electromagnetic relays - Google Patents
Improvements in or relating to electromagnetic relaysInfo
- Publication number
- GB664963A GB664963A GB1607749A GB1607749A GB664963A GB 664963 A GB664963 A GB 664963A GB 1607749 A GB1607749 A GB 1607749A GB 1607749 A GB1607749 A GB 1607749A GB 664963 A GB664963 A GB 664963A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- resistance
- june
- bridge
- operate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
- H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
- H01H43/308—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action based on the change of electrical properties, e.g. thermistors
Landscapes
- Control Of Resistance Heating (AREA)
- Keying Circuit Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
664,963. Electro-magnetic relays. PLESSEY. CO., Ltd. June 16, 1950. [June 16, 1949] No. 16077/49. Class 38 (v). The time of operation or release of a relay is controlled by associating the relay with a non-linear resistance L3 which forms one arm of a Wheatstone bridge arrangement the other three arms of which are constituted by ordinary resistances R3, R4; R5. In the form shown, wherein momentary closure of a switch' S causes the relay RL to operate for a predetermined time, closure of the switch S causes the relay RL to operate and close a maintaining contact H which places the battery BA across the points 3, 4 of the bridge. The resistance L3 heats up till the bridge becomes balanced or nearly so whereupon the current' through the relay RL is so reduced 'that it releases. The resistance L3 may be a metal filament or carbon filament lamp or a barretter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1607749A GB664963A (en) | 1949-06-16 | 1949-06-16 | Improvements in or relating to electromagnetic relays |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1607749A GB664963A (en) | 1949-06-16 | 1949-06-16 | Improvements in or relating to electromagnetic relays |
Publications (1)
Publication Number | Publication Date |
---|---|
GB664963A true GB664963A (en) | 1952-01-16 |
Family
ID=10070735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1607749A Expired GB664963A (en) | 1949-06-16 | 1949-06-16 | Improvements in or relating to electromagnetic relays |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB664963A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3105175A (en) * | 1959-05-26 | 1963-09-24 | Siliani Pier Luigi | Self-adjusting condition responsive relay circuit |
-
1949
- 1949-06-16 GB GB1607749A patent/GB664963A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3105175A (en) * | 1959-05-26 | 1963-09-24 | Siliani Pier Luigi | Self-adjusting condition responsive relay circuit |
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