GB430253A - Improvements in and relating to mercury thread cut-outs - Google Patents
Improvements in and relating to mercury thread cut-outsInfo
- Publication number
- GB430253A GB430253A GB3537533A GB3537533A GB430253A GB 430253 A GB430253 A GB 430253A GB 3537533 A GB3537533 A GB 3537533A GB 3537533 A GB3537533 A GB 3537533A GB 430253 A GB430253 A GB 430253A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mercury
- thread
- limb
- tube
- circuit
- 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
- H01H87/00—Protective devices in which a current flowing through a liquid or solid is interrupted by the evaporation of the liquid or by the melting and evaporation of the solid when the current becomes excessive, the circuit continuity being reestablished on cooling
Landscapes
- Contacts (AREA)
Abstract
430,253. Mercury switches. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London, LUCAS, G. S. C., 75, Eastlands Road, and MAYO, C. G., 17, Alexandra Road, both in Rugby. Dec. 15, 1933, No. 35375. [Class 38 (v)] A mercury thread cut-out comprises an hermetically sealed U- tube 1 formed with a capillary portion 2 in each limb and containing mercury 3 above which is a vacuum or an inert gas. Electrodes 4 are sealed into the ends of the limbs of the tube and an electrode 5 is sealed into the bend of the tube. In use, the electrode 5 and one of the electrodes 4 are connected in circuit so that on overload the mercury thread in the capillary 2 volatilizes to break the thread and break the circuit. To re-establish the circuit the other electrode 4 is connected in circuit and when the corresponding mercury thread is ruptured on overload, the movement of mercury serves to reset the previously ruptured thread in the other limb. In a modification, only one limb of the U-tube has a capillary portion. The other limb is merely a mercury reservoir and contains a plunger of magnetic material which may be operated by an outside coil to reset the thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3537533A GB430253A (en) | 1933-12-15 | 1933-12-15 | Improvements in and relating to mercury thread cut-outs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3537533A GB430253A (en) | 1933-12-15 | 1933-12-15 | Improvements in and relating to mercury thread cut-outs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB430253A true GB430253A (en) | 1935-06-17 |
Family
ID=10377031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3537533A Expired GB430253A (en) | 1933-12-15 | 1933-12-15 | Improvements in and relating to mercury thread cut-outs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB430253A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3131273A (en) * | 1961-06-01 | 1964-04-28 | Richard E Blodgett | Reusable mercury circuit breaker device |
| GB2145285A (en) * | 1983-06-22 | 1985-03-20 | Huang Chi Huang | Electrical contact thermometer and sound producing warning means |
-
1933
- 1933-12-15 GB GB3537533A patent/GB430253A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3131273A (en) * | 1961-06-01 | 1964-04-28 | Richard E Blodgett | Reusable mercury circuit breaker device |
| GB2145285A (en) * | 1983-06-22 | 1985-03-20 | Huang Chi Huang | Electrical contact thermometer and sound producing warning means |
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