GB587807A - Improvements in or relating to heat sensitive devices - Google Patents
Improvements in or relating to heat sensitive devicesInfo
- Publication number
- GB587807A GB587807A GB108145A GB108145A GB587807A GB 587807 A GB587807 A GB 587807A GB 108145 A GB108145 A GB 108145A GB 108145 A GB108145 A GB 108145A GB 587807 A GB587807 A GB 587807A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- bar
- bimetal
- strip
- switch
- 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
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 229910052573 porcelain Inorganic materials 0.000 abstract 1
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
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
- H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
587,807. Temperature-responsive actuating- elements. BROOKHIRST SWITCHGEAR, Ltd., and HUMPHREYS, M. N. Jan. 13, 1945, No. 1081. [Class 64 (ii)] [Also in Group XXXVII] A heat sensitive device comprises a plurality of bimetal strips 10, 11, 12, supported for pivotal movement about the V elements 16 and 17, the strips being connected together at one end by the bar 20 which pivots about the point 21, at the other end the strips normally contacting a stop 23, Fig. 3, and below this end of each strip is a common trip bar 24. Near each strip is its individual heater 13 located in a trough 14 of porcelain or other insulating material. In the case of a thermal overload, the strips raise the bar 20 to operate a trip switch 25 through an operating member 26, or if one of the heating circuits should fail, the movement of the other strips carries the coupled end of the unheated one up,'and so depresses its farther end to move the trip bar 24 and so actuate the switch through the member 27. An unheated bimetal strip 23 may be used to compensate for ambient temperature variation, by varying the position of one of the switch contacts. In a modification, bimetal helices may replace the strips, or strips with linear thermal response characteristics may be used. The device may be employed in a polyphase alternating current electric circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB108145A GB587807A (en) | 1945-01-13 | 1945-01-13 | Improvements in or relating to heat sensitive devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB108145A GB587807A (en) | 1945-01-13 | 1945-01-13 | Improvements in or relating to heat sensitive devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB587807A true GB587807A (en) | 1947-05-06 |
Family
ID=9715837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB108145A Expired GB587807A (en) | 1945-01-13 | 1945-01-13 | Improvements in or relating to heat sensitive devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB587807A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205998A (en) * | 1987-05-19 | 1988-12-21 | Crabtree Electrical Ind Ltd | Temperature responsive device |
-
1945
- 1945-01-13 GB GB108145A patent/GB587807A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205998A (en) * | 1987-05-19 | 1988-12-21 | Crabtree Electrical Ind Ltd | Temperature responsive device |
GB2205998B (en) * | 1987-05-19 | 1991-03-13 | Crabtree Electrical Ind Ltd | Temperature responsive devices |
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