GB385937A - Thermally acting three-phase releasing device for excess current switches - Google Patents
Thermally acting three-phase releasing device for excess current switchesInfo
- Publication number
- GB385937A GB385937A GB963531A GB963531A GB385937A GB 385937 A GB385937 A GB 385937A GB 963531 A GB963531 A GB 963531A GB 963531 A GB963531 A GB 963531A GB 385937 A GB385937 A GB 385937A
- Authority
- GB
- United Kingdom
- Prior art keywords
- members
- contact
- another modification
- strip
- equal
- 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
- 230000004048 modification Effects 0.000 abstract 4
- 238000012986 modification Methods 0.000 abstract 4
- 239000011800 void material Substances 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
-
- 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
- H01H71/162—Electrothermal mechanisms with bimetal element with compensation for ambient temperature
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
385,937. Thermal switches; automatic circuit-breakers. S C H I L E & BRUCHSALER-INDUSTRIE WERKE AKT.-GES., Baden-Baden, Germany. March 30, 1931, No. 9635. Convention date, March 31, 1930. Void [Published under Sect. 91 of the Acts]. [Class 38 (v).] A three-phase overload thermal switch which operates for moderate overloads only when there is unequal loading, but for bigger overloads in any case, comprises two members I, II biased in opposite directions and acted upon by three thermal elements in the three phases in such a manner that relative movement of the members to operate the switch occurs when the thermal elements move to different extents. In the form shown in Fig. 1, the members I, II are biased by springs 1, 2, and have slots into which the bimetallic strips IIIa, IIIb, IIIc project as shown. When the strips bend to the right the member II moves a distance equal to the greatest distance moved by any strip, but the member I is pulled by its spring 1 a distance which is only equal to the smallest distance moved by any strip. With unequal loading therefore the member II moves farther than the member I and a contact 3 on it is separated from a contact 4 on the member I thereby opening a circuit of a no-volt coil. With a high overload the member I strikes a stop 6 and its contact 4 is therefore left behind the contact 3 even if the loading is equal. In modifications, Figs. 3 and 4 (not shown), a bimetallic strip is mounted on the stop 6 or on the member I to compensate for variations of atmospheric temperature. In another modification, Fig. 5, relative movement between the members I, II frees a spring blade 8 which moves downward and actuates a pawl 9 to cause the switch to open. In another modification, Fig. 2 (not shown), the members I, II are discs rotatable about a common axis and having slots in their peripheries in which the bimetallic strips pass. In another modification, Fig. 6 (not shown), the member I rests on three current carrying wires and the member II is pulled upwards so as to bear on the lower sides of the three wires.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE519464T | 1930-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB385937A true GB385937A (en) | 1933-01-05 |
Family
ID=34085409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB963531A Expired GB385937A (en) | 1930-04-01 | 1931-03-30 | Thermally acting three-phase releasing device for excess current switches |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE519464C (en) |
| FR (1) | FR714047A (en) |
| GB (1) | GB385937A (en) |
| NL (1) | NL32695C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1709661B1 (en) * | 2004-01-30 | 2010-05-19 | Siemens Aktiengesellschaft | Protective switch device comprising a differential current triggering device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE744477C (en) * | 1933-05-26 | 1944-01-17 | Schiele Industriewerke Inhaber | Multi-pole overcurrent release device |
| DE755789C (en) * | 1937-08-20 | 1954-04-05 | Schiele Industriewerke Inhaber | Thermal trip device for switches in multi-phase alternating current circuits |
| DE877792C (en) * | 1944-08-10 | 1953-05-26 | Walther Dr Thoma | Circuit breaker for multi-phase power consumers with extended protective properties |
| GB818561A (en) * | 1955-01-18 | 1959-08-19 | Dewhurst & Partner Ltd | Improvements in or relating to devices for affording protection to electric circuits |
-
0
- NL NL32695D patent/NL32695C/xx active
-
1930
- 1930-04-01 DE DE1930519464D patent/DE519464C/en not_active Expired
-
1931
- 1931-03-30 FR FR714047D patent/FR714047A/en not_active Expired
- 1931-03-30 GB GB963531A patent/GB385937A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1709661B1 (en) * | 2004-01-30 | 2010-05-19 | Siemens Aktiengesellschaft | Protective switch device comprising a differential current triggering device |
Also Published As
| Publication number | Publication date |
|---|---|
| FR714047A (en) | 1931-11-06 |
| NL32695C (en) | |
| DE519464C (en) | 1931-02-28 |
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