GB721435A - Improvements in or relating to electrical relays - Google Patents
Improvements in or relating to electrical relaysInfo
- Publication number
- GB721435A GB721435A GB406251A GB406251A GB721435A GB 721435 A GB721435 A GB 721435A GB 406251 A GB406251 A GB 406251A GB 406251 A GB406251 A GB 406251A GB 721435 A GB721435 A GB 721435A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strip
- contacts
- spring
- carries
- contact
- 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
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
721,435. Switching systems for consumption apparatus. WILCOX & CO., Ltd., E., and WILCOX, E. R. May 20, 1952. [Feb. 20, 1951], No. 4062/51. Class 38 (4). [Also in Group XXXVII] The current of a system is limited during periods when the system voltage falls below a certain value by a relay comprising an undervoltage release switch whose contacts, when closed, short circuit the actuating element of a re-settable overload release switch. The undervoltage switch comprises a bimetal strip i which has a heater j permanently connected to supply terminals b, f and insulatingly carries a contact bar k, having contacts m, n cooperating with contacts o, d. The latter is carried by a rigid, fixed bar a connected at one end to the terminal b and supporting a spindle r which is urged to rotate by a spring s and carries a cradle t supporting a bimetal strip x. Strip x carries a contact y which co-operates with the contact o which is mounted on a spring p. When the voltage is normal, the contacts are closed as shown, so that strip x is shorted out, but if the voltage falls, strip i bends down and removes the short from strip x which, if an excessive current occurs, arches upwards until it clears a pin e, whereupon it is rotated counter-clockwise about pin r by spring 8 to separate contacts o, y. The operating current is determined by the pressure of a spring v and the size of strip x. The latter is restored, after cooling, by a push-button indicated at z. It is stated that the relay may alternatively be operated electromagnetically, or by a combination of the two methods.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB406251A GB721435A (en) | 1951-02-20 | 1951-02-20 | Improvements in or relating to electrical relays |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB406251A GB721435A (en) | 1951-02-20 | 1951-02-20 | Improvements in or relating to electrical relays |
Publications (1)
Publication Number | Publication Date |
---|---|
GB721435A true GB721435A (en) | 1955-01-05 |
Family
ID=9770004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB406251A Expired GB721435A (en) | 1951-02-20 | 1951-02-20 | Improvements in or relating to electrical relays |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB721435A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2860211A (en) * | 1956-08-10 | 1958-11-11 | Controls Co Of America | Electric switches |
US3169181A (en) * | 1961-12-08 | 1965-02-09 | Bendix Corp | Temperature and humidity responsive device having high switching load capacity |
US3243548A (en) * | 1961-06-07 | 1966-03-29 | Bendix Corp | Constant actuating force control switch with contact weld breaking means |
US3272943A (en) * | 1964-02-06 | 1966-09-13 | Calor App Electro Domestiques | Electric shaver control assembly |
-
1951
- 1951-02-20 GB GB406251A patent/GB721435A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2860211A (en) * | 1956-08-10 | 1958-11-11 | Controls Co Of America | Electric switches |
US3243548A (en) * | 1961-06-07 | 1966-03-29 | Bendix Corp | Constant actuating force control switch with contact weld breaking means |
US3169181A (en) * | 1961-12-08 | 1965-02-09 | Bendix Corp | Temperature and humidity responsive device having high switching load capacity |
US3272943A (en) * | 1964-02-06 | 1966-09-13 | Calor App Electro Domestiques | Electric shaver control assembly |
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