GB446672A - Improvements in and relating to electrically heated thermal control elements, specially applicable to expansion type thermal elements forming overload and/or no-volt devices for electric circuit-breakers, contactors and the like - Google Patents
Improvements in and relating to electrically heated thermal control elements, specially applicable to expansion type thermal elements forming overload and/or no-volt devices for electric circuit-breakers, contactors and the likeInfo
- Publication number
- GB446672A GB446672A GB3117134A GB3117134A GB446672A GB 446672 A GB446672 A GB 446672A GB 3117134 A GB3117134 A GB 3117134A GB 3117134 A GB3117134 A GB 3117134A GB 446672 A GB446672 A GB 446672A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- strip
- breakers
- lever
- contactors
- 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
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
Abstract
446,672. Thermal switches ; automatic circuit-breakers. COX, F. B., 65, Fleet Street, Liverpool. Oct. 31, 1934, No. 31171. [Class 38 (v)] A thermal switch for controlling an automatic circuit-breaker comprises a bimetallic strip S, Fig. 1, fixed at one end to a terminal T<1> and at the other end to a heating strip H also connected to terminal T<1>. The free ends of strips S, H are connected by a lead F to a terminal T<2>. When an excess current passes through the strips S and H they bend to the right and tilt a bell-crank lever D to separate contacts 4, 5 in the hold-on circuit of a circuitbreaker. The heating element H may be wound on a tube surrounding the strip S. In the arrangement shown in Fig. 2, on failure of voltage across the terminals T<1>, T<2>, strip S bends to the left and rotates lever E to lift a detent 11 and release a circuit-breaker 12. The point 1 passes the end 7 of lever E, and the circuit-breaker may be reset before strip S is heated, as the return movement thereby causes an idle movement of lever E. In another arrangement the point 1 is arranged between two levers E which are operated respectively due to overload and no-volt conditions, to open the circuit of a hold-on coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3117134A GB446672A (en) | 1934-10-31 | 1934-10-31 | Improvements in and relating to electrically heated thermal control elements, specially applicable to expansion type thermal elements forming overload and/or no-volt devices for electric circuit-breakers, contactors and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3117134A GB446672A (en) | 1934-10-31 | 1934-10-31 | Improvements in and relating to electrically heated thermal control elements, specially applicable to expansion type thermal elements forming overload and/or no-volt devices for electric circuit-breakers, contactors and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB446672A true GB446672A (en) | 1936-04-30 |
Family
ID=10319087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3117134A Expired GB446672A (en) | 1934-10-31 | 1934-10-31 | Improvements in and relating to electrically heated thermal control elements, specially applicable to expansion type thermal elements forming overload and/or no-volt devices for electric circuit-breakers, contactors and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB446672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3270167A (en) * | 1963-01-09 | 1966-08-30 | G V Controls Inc | Thermal relay with improved heater arrangement |
-
1934
- 1934-10-31 GB GB3117134A patent/GB446672A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3270167A (en) * | 1963-01-09 | 1966-08-30 | G V Controls Inc | Thermal relay with improved heater arrangement |
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