GB530967A - Improvements in and relating to thermal relays - Google Patents
Improvements in and relating to thermal relaysInfo
- Publication number
- GB530967A GB530967A GB19871/39A GB1987139A GB530967A GB 530967 A GB530967 A GB 530967A GB 19871/39 A GB19871/39 A GB 19871/39A GB 1987139 A GB1987139 A GB 1987139A GB 530967 A GB530967 A GB 530967A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- members
- movement
- july
- vibration
- 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
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/64—Contacts
- H01H37/66—Magnetic reinforcement of contact pressure; Magnet causing snap action
Landscapes
- Electromagnets (AREA)
- Thermally Actuated Switches (AREA)
- Relay Circuits (AREA)
Abstract
530,967. Thermal switches. BRITISH THOMSON-HOUSTON CO., Ltd. July 7, 1939, No. 19871. Convention date, July 9, 1938. [Class 38(v)] (Also in Group XIII] A bi-metallic thermal relay rendered highly insensitive to mechanical shock and vibration, comprises a pair of oppositely-acting strips 10 each secured to a yieldable member 11 on a bracket provided with an adjusting screw 14. Each strip carries a magnetizable member 19, a hollow iron sleeve 21, a silver contact 22 within the sleeve 21 and a copper sheet 23. Members 19 co-operate with poles 18 of an adjustable permanent magnet 16 of high retentivity and coercivity and consisting, for example, of an alloy of aluminium, nickel, cobalt and iron. The two strips, together with the parts carried by them, are substantially similar, so that the system is inherently insensitive to any vibration to which the relay is subjected, but any movement of the strips relative to the magnet 16 produces eddy currents in the sheets 23 and members 19 which tend to damp the movement producing them. This damping is aided by hysteresis losses in members 19 and, in the closed position, by the friction produced between the contacts due to collective movement of the strips. The magnetic force also tends to accelerate the closing and opening movements of the contacts, in the latter case, because the magnetic force diminishes more rapidly than the bending-force of the strips, increases due to the temperature-change.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US218477A US2195304A (en) | 1938-07-09 | 1938-07-09 | Dynamically balanced thermal relay |
Publications (1)
Publication Number | Publication Date |
---|---|
GB530967A true GB530967A (en) | 1940-12-24 |
Family
ID=22815275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19871/39A Expired GB530967A (en) | 1938-07-09 | 1939-07-07 | Improvements in and relating to thermal relays |
Country Status (3)
Country | Link |
---|---|
US (1) | US2195304A (en) |
DE (1) | DE696418C (en) |
GB (1) | GB530967A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE741860C (en) * | 1940-11-03 | 1943-11-18 | Voigt & Haeffner Ag | Two-metal release insensitive to shocks |
DE1075205B (en) * | 1956-05-14 | 1960-02-11 | CKD Modfany, närodni podnik und Karel Peträsek, Modfany, Prag (Tschechoslowakei) | Adjustment device for thermal releases, especially for overcurrent releases |
DE1136134B (en) * | 1959-07-30 | 1962-09-06 | Gerdts Gustav F Kg | Bimetal column |
DE1131785B (en) * | 1960-08-09 | 1962-06-20 | Licentia Gmbh | Thermal release for electrical switchgear |
US4224593A (en) * | 1978-12-21 | 1980-09-23 | Eaton Corporation | Double-motion thermostat |
CN103578873B (en) * | 2012-07-27 | 2016-03-30 | 施耐德电器工业公司 | The temperature compensation of thermal relay |
-
1938
- 1938-07-09 US US218477A patent/US2195304A/en not_active Expired - Lifetime
- 1938-11-04 DE DE1938L0096090 patent/DE696418C/en not_active Expired
-
1939
- 1939-07-07 GB GB19871/39A patent/GB530967A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE696418C (en) | 1940-09-20 |
US2195304A (en) | 1940-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB749316A (en) | Improvements in or relating to electromagnetic relays | |
GB838988A (en) | Improvements in or relating to polarised electromagnetic relays | |
GB530967A (en) | Improvements in and relating to thermal relays | |
GB572686A (en) | Improvements in and relating to shock resisting relays and switches | |
GB1182044A (en) | Electro Magnetic Holding Relay | |
GB473589A (en) | Improvements in or relating to electric contact making relays | |
GB829332A (en) | Improvements in and relating to electromagnetic relays | |
GB1057780A (en) | Electromagnetic relays | |
GB1304887A (en) | ||
GB196305A (en) | Improvements in and relating to electric relays and the like | |
GB594254A (en) | Balanced electric relays or switches | |
GB584050A (en) | Improvements in or relating to electromagnetic switches and relays | |
GB906554A (en) | Electrical relay with armature contacts arranged in a sealed protective tube | |
ES472136A2 (en) | Electro-magnetic relay with first and second spring biasing means | |
GB906099A (en) | Improvements in or relating to electro-magnetic relays | |
GB478110A (en) | Improvements in or relating to electrical relays | |
GB541983A (en) | Improvements in electromagnets | |
GB757415A (en) | Electromagnetic switches | |
GB446135A (en) | Improvements in and relating to electromagnetic time element devices | |
GB740262A (en) | Electric contact devices having magnetic means for increasing the contact pressure | |
GB647843A (en) | Electromagnetic relays | |
GB887714A (en) | Improvements in or relating to electro-mechanical transducers | |
GB903901A (en) | Improvements in and relating to d.c. electrical relays having spring contacts | |
GB605422A (en) | Improvements in polarised relays | |
GB387792A (en) | Improvements in or relating to switches for controlling alternating current circuits |