GB1173639A - Thermally Operated Three-Phase Protective Device. - Google Patents
Thermally Operated Three-Phase Protective Device.Info
- Publication number
- GB1173639A GB1173639A GB44334/67A GB4433467A GB1173639A GB 1173639 A GB1173639 A GB 1173639A GB 44334/67 A GB44334/67 A GB 44334/67A GB 4433467 A GB4433467 A GB 4433467A GB 1173639 A GB1173639 A GB 1173639A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lever
- contacts
- stop
- contact
- bimetallic
- 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
- 230000001681 protective effect Effects 0.000 title abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 2
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)
- Protection Of Generators And Motors (AREA)
- Breakers (AREA)
Abstract
1,173,639. Protective arrangements. SQUARE D CO. 29 Sept., 1967 [18 Oct., 1966], No. 44334/67. Heading H2K. [Also in Division H1] A polyphase protective device comprises a plurality of bimetallic elements 26, 28, 30, each having one end attached to a lever 14 and the other end co-operating with a lever 16 and a stop 48. Resilient means, e.g. an ambient temperature compensating element 32 has one end attached to the lever 14 and its other end co-operating with an adjustable stop 64. When balanced overload occurs, the bimetallic elements are heated by heating elements 34, 36, 38 and after initial movement of the lever 14 to take up the lost motion between the element 32 and the stop 64 and to stress the element 32, the lever 16 is moved to change over a moving contact 74 from a fixed contact 72 to a fixed contact 70. These contacts are those of a spring blade snap-action switch unit having a resetting push-button 157 which may be used to manually reset the contacts by moving the " fixed " contact 70 or may be latched by a slide 178 to hold the contact 70 in the position shown so that the contacts are reset automatically as the bimetallic elements cool. When unbalanced conditions occur, e.g. due to phase failure, one or more of the bimetallic elements 26, 28, 30 abuts the stop 48 and helps to restrain movement of the lever 14 so facilitating the movement of the lever 16 by the heated bimetallic elements. An " accelerating " bimetallic element 66 is heated by all the heating elements 34, 36, 38 and is provided to ensure operation of the device under unbalanced loading occurring due to the failure of a primary phase when a star delta transformer is used to supply a motor. This element 66 is fixed at one end and has its other end acting on the lever 14. The opening of the contacts 72, 74 may interrupt the supply to the operating coil of a contactor and the closing of the contacts 74, 70 may complete an alarm or indicating circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58747166A | 1966-10-18 | 1966-10-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1173639A true GB1173639A (en) | 1969-12-10 |
Family
ID=24349940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB44334/67A Expired GB1173639A (en) | 1966-10-18 | 1967-09-29 | Thermally Operated Three-Phase Protective Device. |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3422317A (en) |
| DE (1) | DE1588792B2 (en) |
| FR (1) | FR1548485A (en) |
| GB (1) | GB1173639A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004019178A1 (en) * | 2004-04-16 | 2005-11-03 | Abb Patent Gmbh | Service switching device |
| DE102012111566A1 (en) | 2012-11-29 | 2014-06-05 | Eaton Electrical Ip Gmbh & Co. Kg | Tripping device for circuit breaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2682005A (en) * | 1952-06-18 | 1954-06-22 | Gen Electric | Dynamoelectric machine overload protection system |
| US2838718A (en) * | 1953-05-28 | 1958-06-10 | Ite Circuit Breaker Ltd | Current limiting protection for contactors |
| US2928997A (en) * | 1955-05-10 | 1960-03-15 | Ite Circuit Breaker Ltd | Coordinated circuit breaker and current limiting device |
| US3031601A (en) * | 1960-09-27 | 1962-04-24 | Gen Electric | Circuit protective apparatus |
-
1966
- 1966-10-18 US US587471A patent/US3422317A/en not_active Expired - Lifetime
-
1967
- 1967-09-29 GB GB44334/67A patent/GB1173639A/en not_active Expired
- 1967-10-16 FR FR1548485D patent/FR1548485A/fr not_active Expired
- 1967-10-18 DE DE19671588792 patent/DE1588792B2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE1588792A1 (en) | 1970-10-29 |
| DE1588792B2 (en) | 1971-09-30 |
| FR1548485A (en) | 1968-12-06 |
| US3422317A (en) | 1969-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |