GB494395A - Improvements in and relating to current limiting devices - Google Patents
Improvements in and relating to current limiting devicesInfo
- Publication number
- GB494395A GB494395A GB7497/38A GB749738A GB494395A GB 494395 A GB494395 A GB 494395A GB 7497/38 A GB7497/38 A GB 7497/38A GB 749738 A GB749738 A GB 749738A GB 494395 A GB494395 A GB 494395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- load
- resistance
- relating
- march
- 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
- H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
- H01H81/04—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electromagnetically operated
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuses (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
494,395. Protective cut-out arrangements. BRITISH THOMSON -HOUSTON CO., Ltd. March 10, 1938, No. 7497. Convention date, March 11, 1937. [Class 38 (v)] When the current through the load a exceeds a certain value, an overload switch c is opened by current winding b, thereby inserting an additional resistance d in series with the load, this resistance including the heating element g of a thermally operated switch e with contact f by which the load circuit is opened after a predetermined heating of the element. The switches close when the current fails or the heating element cools. Resistance d may be combined with winding b to assist in holding contacts c open.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE494395X | 1937-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB494395A true GB494395A (en) | 1938-10-25 |
Family
ID=6544706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7497/38A Expired GB494395A (en) | 1937-03-11 | 1938-03-10 | Improvements in and relating to current limiting devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB494395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2557424A (en) * | 1947-03-07 | 1951-06-19 | North American Aviation Inc | Directional circuit protector |
| DE1060974B (en) * | 1958-06-11 | 1959-07-09 | Bbc Brown Boveri & Cie | Switching device for short-circuit current limitation in power converter systems |
-
1938
- 1938-03-10 GB GB7497/38A patent/GB494395A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2557424A (en) * | 1947-03-07 | 1951-06-19 | North American Aviation Inc | Directional circuit protector |
| DE1060974B (en) * | 1958-06-11 | 1959-07-09 | Bbc Brown Boveri & Cie | Switching device for short-circuit current limitation in power converter systems |
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