US2665347A - Electric circuit breaker - Google Patents

Electric circuit breaker Download PDF

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Publication number
US2665347A
US2665347A US289742A US28974252A US2665347A US 2665347 A US2665347 A US 2665347A US 289742 A US289742 A US 289742A US 28974252 A US28974252 A US 28974252A US 2665347 A US2665347 A US 2665347A
Authority
US
United States
Prior art keywords
casing
portions
contacts
circuit breaker
plunger
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 - Lifetime
Application number
US289742A
Other languages
English (en)
Inventor
Ingwersen Richard Castle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mechanical Products Inc
Original Assignee
Mechanical Products Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US23971D priority Critical patent/USRE23971E/en
Priority to NL79693D priority patent/NL79693C/xx
Application filed by Mechanical Products Inc filed Critical Mechanical Products Inc
Priority to US289742A priority patent/US2665347A/en
Priority to GB17019/52A priority patent/GB715423A/en
Priority to FR1062637D priority patent/FR1062637A/fr
Priority to DEM14882A priority patent/DE962091C/de
Priority to ES0204934A priority patent/ES204934A1/es
Priority to CH306771D priority patent/CH306771A/fr
Application granted granted Critical
Publication of US2665347A publication Critical patent/US2665347A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts

Definitions

  • This invention relates to electric circuit breakers of the kind which comprise a hollow casing in which a thermal element adapted to be responsive to the heat of the conducted current is mounted for movement with respect to a relatively fixed abutment contained Within the casing along with fixed and movable contacts corresponding to a circuit, the opening of which is effected automatically upon the occurrence of current of a predetermined value, due to the thermal element freeing itself from engagement with its abutment and releasing the movable contacts to move to open position.
  • Fig. 2 is a longitudinal section of a circuit breaker and casing assembly according to Fig. l but with the parts completely assembled and taken in a plane corresponding to the line a-a Fig. 1 is an elevational view looking upon the inside of one half of the casing of the circuit breaker according to the invention, with the separate metal parts, instead with the abutment in Fig. l, the contacts, thermal latch and plunger parts being shown in elevation,
  • Fig. 3 is a transverse section on the line b--b of Fig. 1, and
  • Figs. 4 and 5 are transverse sections on the lines cc and dd of Fig. 1, with the thermal latch and associated parts removed.
  • the casing construction is shown composed of two similar semi-cylindrical casing sections i and 2 of insulating material, which sections define a longitudinally extending split 3 in the casing and are held in assembled relationship by a pair of end caps, indicated generally at 4 and 5.
  • the casing sections combine to form an enclosed interior chamber 6, in which there are mounted a pair of diametrically spaced fixed contacts I, and in which chamber there is also mounted a thermal latch and movable contact unit, indicated generally at 8, and an actuator plunger 9..
  • the unit 8 comprises a thermal latch assembly presenting oppositely disposed substantially U-shape bimetallic parts it! united by integral bridge portions 1 l upon which portions the movable contacts l2 are mounted for engagement with their companion fixed contacts I.
  • the unit 8 is slidable relatively to the plunger 9, with the parts i 3 located upon opposite sides of the plunger and adapted to have releasable latching engagement with abutment ledges 13 (Fig. 1) secured upon the plunger.
  • abutment ledges 13 Fig. 1
  • These ledges are preferably provided by separate metal L-shape parts secured upon the plunger 9, as by a rivet it.
  • V i L amperes; V i L
  • the plunger is provided'with a band'porti on 213, which extends outside the casing when the plunger end i9'is projected, v as stated, and, by being distinctively colored, for example, serves to give avisible indication that the circuit has been broken.
  • a washer 2'I which seals again'stthe insideof'the central opening 22 in the'ca'sing' end wall 23 when the circuit is broken andservesto seal that opening against the escape therethrough of the'attendant electrical arc' and the evolved flame and gases.
  • An-additional seal is provided by a washer 2'4 retained between the casing end wall 23 and the end'cap'l;
  • the sealing washer 2 4" by'ext'ending across and covering'ltheu'ppe' ends of the split 3, serves to seal thecasing interior against the'escape of the aforesaid evolveda rc gases and name;
  • Theend" cap tisdeforined at its inner end, as by spinning, to permanently embracethecasin'g' shoulder 25; as'indicated at26.
  • Thecasing sections I and 2 alongtheir longitudihally'opposed edge surfaces, are formed with complementary, elongated recesses 30', which define" longitudinally extending channels 3I" in which electrical conductor strips 32 and 33 are accommodated, the conductor 33 being in elec;
  • the fixed contacts I are carried upon end portions 34 of the conductor strips which are bent inwardly in opposite directions into substantially arcuate form, as shown in Fig. 3, to dispose their fixed contacts i in diametrically spaced relationship and as remotely as possible from the casing split 3. It is also to be noted'withrespect to Figs; 3 and-4j-in particular, that the casing inteiior-is formed with inwardly projected wall portions 35 which present wall surfaces 36 in proximity to the curvedly bent portions ⁇ ? of the conductor strip portions 34. Thesecasingwall portions 35 and their wall surfaces 36 are of particular importance and serve the purpose ,of protecting the portions 31 of the cated.
  • the wall surfaces-36 are-also located in said path, immediately ahead'o'f their respective conductor strip portions 31- and, accordingly, said wall surfaces serveas baflles to' prevent the arc name and gases from striking against the otherwise exposed conductor strip portions and causing erosion thereof. That'this is so has been proven in practice, by observing the occurrence of scorching? upon these Wall surfaces upon arcing" occurring. On the other hand, erosion occurred when the baffis were not present. i
  • casing structure defining a cylindrical interior space, a pair of fixed contacts disposed in said space in diametrically spaced relationship, conductor strips carrying said fixed contacts, said conductor strips including end portions enclosed in said casing and opposite end portions extending transversely into said space from diametrically opposite locations on said casing and exposed in said space, said opposite and exposed conductor end portions extending in oppositely directed bent relationship to their said casing locations and terminating in spaced relationship within said space on a diameter substantially perpendicular to said casing locations with said bent conductor portions substantially following the cylindrical contour of said space, said fixed contacts being carried at said terminating conductor ends, movable contact means mounted within said casing space,
  • said movable contact means including spaced contacts positioned to engage with said fixed contacts and incorporating electrically conductive thermal latch means operable to hold said movable contact means closed with respect to said fixed contacts but automatically operable to free said movable contacts to move to open position upon the occurrence of current overload, said movable contact means bridging the space between said fixed contacts, and said fixed and movable contacts being so disposed, when closed, as to give rise to a substantially circular magnetic arcing path when the circuit is interrupted at said contacts, and are baender means within said casing space, said are bafiie means being located between the said transversely bent exposed conductor portions adjacent the said casing locations and the terminating ends of the conductors carrying said fixed contacts so that said baflie means lie within the said arcing path.
  • battle means being constituted by Wall portions on said casing projecting into and extending longitudinally of said space, said wall portions presenting wall surfaces located between the fixed contact on one said conductor and the portion of th other conductor where this conductor portion enters into the said space from a said location, said Wall surfaces having a longitudinal extent greater than the longitudinal extent of the space occupied by said exposed conductor portions and the closed fixed and movable contacts.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
US289742A 1952-05-24 1952-05-24 Electric circuit breaker Expired - Lifetime US2665347A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US23971D USRE23971E (en) 1952-05-24 ingwersen
NL79693D NL79693C (enrdf_load_stackoverflow) 1952-05-24
US289742A US2665347A (en) 1952-05-24 1952-05-24 Electric circuit breaker
GB17019/52A GB715423A (en) 1952-05-24 1952-07-07 Improvements in and relating to electrical circuit breakers
FR1062637D FR1062637A (fr) 1952-05-24 1952-07-12 Disjoncteur électrique
DEM14882A DE962091C (de) 1952-05-24 1952-07-24 Elektrischer Selbstschalter
ES0204934A ES204934A1 (es) 1952-05-24 1952-08-09 Un interruptor de circuito eléctrico
CH306771D CH306771A (fr) 1952-05-24 1952-11-17 Disjoncteur électrique.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US289742A US2665347A (en) 1952-05-24 1952-05-24 Electric circuit breaker

Publications (1)

Publication Number Publication Date
US2665347A true US2665347A (en) 1954-01-05

Family

ID=23112882

Family Applications (1)

Application Number Title Priority Date Filing Date
US289742A Expired - Lifetime US2665347A (en) 1952-05-24 1952-05-24 Electric circuit breaker

Country Status (7)

Country Link
US (1) US2665347A (enrdf_load_stackoverflow)
CH (1) CH306771A (enrdf_load_stackoverflow)
DE (1) DE962091C (enrdf_load_stackoverflow)
ES (1) ES204934A1 (enrdf_load_stackoverflow)
FR (1) FR1062637A (enrdf_load_stackoverflow)
GB (1) GB715423A (enrdf_load_stackoverflow)
NL (1) NL79693C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824931A (en) * 1955-03-07 1958-02-25 Mechanical Products Inc Electric overload circuit breaker
US2875296A (en) * 1954-06-08 1959-02-24 Weber Ag Fab Elektro Automatic circuit breaker
DE974206C (de) * 1954-06-10 1960-11-03 Busch Jaeger Duerener Metall UEberstromselbstschalter mit Hand- und magnetischer bzw. auch thermischer Ausloesung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL90626C (enrdf_load_stackoverflow) * 1953-01-19
DE1138146B (de) * 1961-04-21 1962-10-18 Licentia Gmbh Installations-Selbstschalter in Schraubsockelform

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2378648A (en) * 1943-10-29 1945-06-19 Square D Co Electric switch
US2459629A (en) * 1945-08-10 1949-01-18 Westinghouse Electric Corp Circuit breaker
US2506796A (en) * 1944-05-10 1950-05-09 Cutler Hammer Inc Nonfree-tripping overload circuit breaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE695021C (de) * 1937-12-14 1940-08-16 Siemens Schuckertwerke Akt Ges Installationsselbstschalter
DE705619C (de) * 1939-08-03 1941-05-05 Siemens Schuckertwerke Akt Ges Installationsselbstschalter
DE729566C (de) * 1941-03-07 1942-12-18 Sursum Elek Zitaets Ges Leyhau Funkenkammeranordnung fuer Selbstschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2378648A (en) * 1943-10-29 1945-06-19 Square D Co Electric switch
US2506796A (en) * 1944-05-10 1950-05-09 Cutler Hammer Inc Nonfree-tripping overload circuit breaker
US2459629A (en) * 1945-08-10 1949-01-18 Westinghouse Electric Corp Circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875296A (en) * 1954-06-08 1959-02-24 Weber Ag Fab Elektro Automatic circuit breaker
DE974206C (de) * 1954-06-10 1960-11-03 Busch Jaeger Duerener Metall UEberstromselbstschalter mit Hand- und magnetischer bzw. auch thermischer Ausloesung
US2824931A (en) * 1955-03-07 1958-02-25 Mechanical Products Inc Electric overload circuit breaker

Also Published As

Publication number Publication date
CH306771A (fr) 1955-04-30
DE962091C (de) 1957-04-18
FR1062637A (fr) 1954-04-26
NL79693C (enrdf_load_stackoverflow)
ES204934A1 (es) 1952-10-16
GB715423A (en) 1954-09-15

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