GB498325A - Improvements in, or relating to, automatic circuit breakers and similar electrical switchgear - Google Patents
Improvements in, or relating to, automatic circuit breakers and similar electrical switchgearInfo
- Publication number
- GB498325A GB498325A GB20009/37A GB2000937A GB498325A GB 498325 A GB498325 A GB 498325A GB 20009/37 A GB20009/37 A GB 20009/37A GB 2000937 A GB2000937 A GB 2000937A GB 498325 A GB498325 A GB 498325A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- bar
- trip
- stop
- strip
- 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
- 230000002459 sustained effect Effects 0.000 abstract 2
- 238000005192 partition Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000000284 resting effect Effects 0.000 abstract 1
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
- H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H53/00—Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
- H01H53/10—Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor
-
- 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)
- Breakers (AREA)
Abstract
498,325. Protective cut-out arrangements ; thermal switches. CRABTREE & CO., Ltd., J. A. (Schiele Industriewerke) July 20, 1937, Nos. 20009 and 30943. [Class 38 (v)] Polyphase electric switchgear having a thermally-operated tripping device adapted to open the circuit after a time - delay on the occurrence of sustained balanced overloads and without such delay in the event of unbalanced overloads, has the heatsensitive elements anchored on a sliding bar or rotary spindle and operative on a trip bar or the like trip device, which is adapted for disengaging switch contacts or trip mechanism mounted in the release box or casing. In Figs. 2, 3, bimetal strips 2 with heating-coils 4, one for each phase, are mounted on a bar 3 slidable in a groove 1b in the housing, and the free end of each strip is normally engaged between a projection 5 on the housing and a stop 6a on a further bar 6 slidable in a groove 1a. Due to the engagement between 5, 6a, flexure of the strips when heated causes bar 3 to be slid to the left towards an adjustable stop 9 and when it abuts the stop, further flexure causes the free ends to move the bar 6 to the right, so that a lip 7a operates a freehandle trip or opens a switch 8a in the tractivecoil circuit whereby the circuit-breaker opens. On unbalance, one of the strips undistorts, so moving the bar 3 from the Fig. 2 to the Fig. 3 position, the distorted strips thus moving the bar 6 to the tripping position. In Fig. 5, the strips 2 are fixed to a slidable bar 3b and engage fixed stops 5b at one end and at the other end, projections 6b on a bar 6<1> which is urged to the right by spring 8b. When sustained balanced overload occurs, the bar 3b engages stop 9 and further flexure moves 6<1> to the left to release a catch 12. In unbalance conditions, one strip straightens and moves 3b to the left so that the other strips move 6<1> to the left. In Fig. 7, the strips are fixed on a shaft 3c resting on stops 5c and levers 6c on a further shaft 6<2> are held on the strips by spring 8a anchored to a lever 12a. When heated, the strips flex downwards until an ambienttemperature compensating strip 2c engages stop 9, whereupon further fiexure raises levers 6c to free the trip member 12b. On unbalance, one strip remains straight and restrains movement of spindle 3c so that flexure of the others turns spindle 6<2>. In Fig. 8, U-shaped strips 2d straddling heater coils 4d are secured at one end to arms 3<1> on a rotatable shaft 3d which carries a compensating-strip 2<1> co-operating with the stop 9. The rotatable trip-shaft 6<3> carries arms 6d, between which and the stops 5d the other ends of the strips engage. The action is similar to that of the other forms. In Fig. 9 (not shown), the strips 2 are arranged radially about and fixed to a rotatable sleeve, the free ends co-operating, as in Fig. 8, with fixed stops and projections on a rotatable annular member which is concentric with the sleeve and carries a projection operating contacts as in Fig. 2. The Provisional Speciiications refer to Specification 439,242. The first Provisional Specification describes a switch forming the subject of Specification 498,376 and also refers to the provision of internal air spaces and cavities in the walls and partitions of the release-housing to improve its heatinsulating properties.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2199477X | 1937-08-20 | ||
DE221442X | 1940-09-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB498325A true GB498325A (en) | 1939-01-06 |
Family
ID=32070570
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20009/37A Expired GB498325A (en) | 1937-08-20 | 1937-07-20 | Improvements in, or relating to, automatic circuit breakers and similar electrical switchgear |
GB18530/38A Expired GB501885A (en) | 1937-08-20 | 1937-11-11 | Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18530/38A Expired GB501885A (en) | 1937-08-20 | 1937-11-11 | Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear |
Country Status (5)
Country | Link |
---|---|
US (1) | US2199477A (en) |
BE (1) | BE443183A (en) |
CH (1) | CH221442A (en) |
FR (1) | FR876543A (en) |
GB (2) | GB498325A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2866035A (en) * | 1955-02-17 | 1958-12-23 | C T Electrical Controls Ltd | Thermally operated electric switching mechanisms |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975370C (en) * | 1942-08-17 | 1961-11-16 | Siemens Ag | Bimetal relay for monitoring multi-phase consumers |
GB624581A (en) * | 1947-02-19 | 1949-06-13 | Crabtree & Co Ltd J A | Improvements in automatic circuit breakers having thermal overload release units |
GB624957A (en) * | 1947-07-17 | 1949-06-20 | British Thomson Houston Co Ltd | Improvements in and relating to current sensitive devices for the protection of polyphase circuits |
GB641269A (en) * | 1947-08-02 | 1950-08-09 | Ega Electric Ltd | Improvements in or relating to electric switch gear |
US2581882A (en) * | 1948-07-27 | 1952-01-08 | Cutler Hammer Inc | Device for protecting polyphase circuits |
US2749407A (en) * | 1953-10-15 | 1956-06-05 | Electrical Apparatus Co Ltd | Single phasing preventor |
DE1034252B (en) * | 1954-12-29 | 1958-07-17 | Siemens Ag | Thermal overcurrent relay, in particular protection relay against single-phase operation of motors |
DE1025497B (en) * | 1954-12-29 | 1958-03-06 | Siemens Ag | Thermal overcurrent relay, in particular protection relay against single-phase operation of motors |
GB846937A (en) * | 1957-09-16 | 1960-09-07 | Crabtree & Co Ltd J A | Improvements in thermal overload protection devices for motor starting switches |
US3161733A (en) * | 1961-11-01 | 1964-12-15 | Sylvania Electric Prod | Capacitance shorting switch for electrical translating devices |
US3315054A (en) * | 1965-06-28 | 1967-04-18 | Fed Pacific Electric Co | Overload relay with snap-acting condition responsive switch |
DE1614743B1 (en) * | 1967-11-27 | 1970-09-24 | Starkstrom Schaltgeraetefabrik | Thermal relay |
US3792401A (en) * | 1972-06-29 | 1974-02-12 | Westinghouse Electric Corp | Thermally responsive electrical device |
-
0
- BE BE443183D patent/BE443183A/xx unknown
-
1937
- 1937-07-20 GB GB20009/37A patent/GB498325A/en not_active Expired
- 1937-11-11 GB GB18530/38A patent/GB501885A/en not_active Expired
-
1938
- 1938-01-24 US US186673A patent/US2199477A/en not_active Expired - Lifetime
-
1941
- 1941-09-04 CH CH221442D patent/CH221442A/en unknown
- 1941-10-31 FR FR876543D patent/FR876543A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2866035A (en) * | 1955-02-17 | 1958-12-23 | C T Electrical Controls Ltd | Thermally operated electric switching mechanisms |
Also Published As
Publication number | Publication date |
---|---|
GB501885A (en) | 1939-03-07 |
BE443183A (en) | |
FR876543A (en) | 1942-11-09 |
US2199477A (en) | 1940-05-07 |
CH221442A (en) | 1942-05-31 |
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