US3839691A - Setting and triggering device for thermal relay - Google Patents

Setting and triggering device for thermal relay Download PDF

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Publication number
US3839691A
US3839691A US00323581A US32358173A US3839691A US 3839691 A US3839691 A US 3839691A US 00323581 A US00323581 A US 00323581A US 32358173 A US32358173 A US 32358173A US 3839691 A US3839691 A US 3839691A
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US
United States
Prior art keywords
slide
contacts
ramp
thermal relay
lock
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
US00323581A
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English (en)
Inventor
J Cohen
C Zwingle
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.)
Telemecanique SA
Original Assignee
Telemecanique Electrique SA
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Filing date
Publication date
Application filed by Telemecanique Electrique SA filed Critical Telemecanique Electrique SA
Application granted granted Critical
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    • 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
    • H01H73/22—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 having electrothermal release and no other automatic release
    • H01H73/30—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 having electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • thermoelements designed to control the power supply circuit of a contactor, said thermal relay comprising movable contacts cooperating with stationary contacts, a triggering slide released by thermoelements for displacing the movable contacts to open the circuit in case of excessive current flow and a hand control, controlling the slide and the movable contacts for opening or closing the circuit.
  • the slide cannot be reset in proper position for closing the circuits unless the thermoelements are cold.
  • the invention relates to a thermal relay designed to cut off the feed to a contactor, comprising a set of mobile contacts which may be made to open either by the intervention of a triggering device released when thermoel ements are traversed by too strong a current or by means of a manual control, which moreover serves to re-set the triggering device.
  • thermal relays are in particular used to protect polyphase instruments fed by a contactor, in case of overloading or unbalanced phases.
  • thermoelements which translate the thermal state of the instrument consuming current, have not returned to a normal value, failing which manual pressure on the re-set button would aggravate the conditions which have led to the cut-off.
  • the invention consequently proposed to provide a triggering and resetting system wherein the mobile contacts can only resume their closed position against absolutely fixed contacts when the triggering device has returned to a stable position corresponding to a satisfactory thermal condition.
  • this result is achieved by the fact that operation of the manual setting component produces, on the one hand, the cooperation of a first part connected thereto to cause the mobile contacts to move away, and on the other hand, the cooperation of a second part connected thereto to move a triggering slide to a position where it can be retained by a lock connected to the thermoelements, while the release of the manual setting component ensures that the contacts are kept in an open position for a travel exceeding that which is necessary for said slide to connect with the lock and also exceeding that which is necessary for said slide, in case of non-locking, to cause a further withdrawal of the contacts.
  • the mobile contacts are positioned on a contact-holder one heel of which can be moved by a bearing surface of the slide towards a first resilient component which tends to apply it to the fixed contacts and one end of which cooperates with a first inclined plane, constituting the first part, and situated at the end of the setting component, while a second inclined plane of the latter, constituting the second part, cooperates with the slide to allow the movement of the bearing surface towards the heel when the manual setting component is released, under the influence of a second resilient part whose strength exceeds that of the first resilient part.
  • FIG. 1 shows the thermal relay in its working position
  • FIG. 2 shows the same instrument in its at rest" position
  • FIGS. 3 and 4 show two successive stages of the setting procedure.
  • the thermal relay is in the working position, i.e., the setting component 1 is at rest, the mobile contacts 24, 27 carried by a bridge 23 are applied to the fixed contacts 26, 28 by a resilient part represented by the spring 22 and the triggering device represented by the slide 10 is hooked by its lip 12 on to the lock 16 whose position corresponds to thermoelements in a cold state.
  • the setting component 1 is normally recalled in the direction of the arrow F 1 by a spring 5 whose end hooks into the housing 8 while the slide is subjected to the action of a spring 15 which tends to move it in the direction of the arrow F
  • the springs 5 and 15 are in fact the ends of the same torsional spring mounted on a cylindrical support 6.
  • the figure shows that the contact bridge 23 is placed in a housing 25 formed in a contact-holder 20 with a rounded end 21 and a heel 29.
  • This contact-holder is subjected to the action of the spring 22 to effect a movement in direction F when the heel 29 or the end 21 are not in contact with an obstacle.
  • the movement in question is guided by a groove 13 made in the triggering slide 10 and can take place freely so long as the heel 29 is not applied against the bearing surface 14 of the slide.
  • the slide also has a surface 11 which is inclined in relation to the direction of movement F and consequently, also inclined in relation to the direction F which is perpendicular to F
  • the setting component 1 is positioned in such a way that a first part belonging thereto, represented by the inclined plane 3 and the bearing surface 4, can cooperate with the end 21 of the contact-holder when the device is actuated in the direction of the arrow F while a second part represented by the inclined plane 2 can cooperate with the inclined surface 11 belonging to the slide 10, in the same movement.
  • the setting component which subsequently, when the electroelements are cold, only acts as a switch, will be used in this way when it is wished to de-excite the contactor whose coil feed circuit is in series with the contacts 26, 24, 27, 28.
  • thermoelements When the strength of the current consumed by an instrument fed by means of the contactor is going to become too high, the thermoelements will change shape to move the lock 16 in the direction F and consequently move the slide in the direction F under the action of the spring 15, bringing about the opening of the contacts due to the thrust of 14 on the heel 29 and the placing of the various components in the at rest position shown in FIG. 2.
  • the thermal relay also has to ensure that the closing of the contacts can only occur when the thermal conditions of the thermoelements, which translate the thermal condition of the consuming instrument, have resumed their normal state. Any operation of the setting component must therefore have no effect on the contacts so long as the slide 10 cannot be retained, held by the lock 16.
  • FIGS. 3 and 4 show successive stages of a procedure for re-setting the contacts.
  • the upward travel of the button which is to allow the contact-holder to move to the closed po sition is greater than that which is necessary for the slide to apply a further recoil to the contact-holder in the direction F this travel also exceeds that which is necessary for the slide to remain hooked on the lock,
  • a thermal relay comprising:
  • a movable contact holder (20) including a stud (29) and a thrust surface (21), and provided with mobile contacts (24,27), which cooperate with fixed contacts (26,28) when the contact holder is subjected to the action of a first resilient element (22);
  • thermosensitive element carrying electric current
  • a slide (10) having a hook (12) and a bearing (14), which is operable in either a first position in which the hook (12) is applied, through the force of a second resilient element (15) against the lock (16) and in which the bearing (14) is located a distance from the stud (29); or in a second position in which the hook is no longer applied against the lock owing to deformation of the thermosensitive elements and in which the bearing (14) forces the stud (29) of the contact holder (20) against said first resilient element (22), said slide also having a ramp (1]) inclined in relation to the direction of movement of the slide; and
  • a manual operating device (1) including a first ramp (2) which when actuated cooperates with the ramp (11) to move the slide into a first position and a second ramp (3) which cooperates with the thrust surface (21) to move the contact holder and separate the fixed and mobile contacts (26, 28 and 24, 27).
  • the first and second ramps of the manual operating device (1) include surfaces (3,4) inclined in opposite directions located between the ramp (11) and the thrust surface (21) to cause oppositely directed movements of the slide (10) in relation to the contact holder (20), the latter being guided in a groove (13) of the slide (10).

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  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
US00323581A 1972-01-14 1973-01-15 Setting and triggering device for thermal relay Expired - Lifetime US3839691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7201368A FR2167437B1 (xx) 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
US3839691A true US3839691A (en) 1974-10-01

Family

ID=9091979

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323581A Expired - Lifetime US3839691A (en) 1972-01-14 1973-01-15 Setting and triggering device for thermal relay

Country Status (14)

Country Link
US (1) US3839691A (xx)
BE (1) BE793833A (xx)
BR (1) BR7300228D0 (xx)
CA (1) CA970005A (xx)
CH (1) CH567799A5 (xx)
DE (1) DE2300739A1 (xx)
DK (1) DK144494C (xx)
ES (1) ES410614A1 (xx)
FR (1) FR2167437B1 (xx)
GB (1) GB1412831A (xx)
IT (1) IT978171B (xx)
NL (1) NL7300429A (xx)
NO (1) NO135114C (xx)
SE (1) SE388071B (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2633774C3 (de) * 1976-07-28 1983-02-10 Brown, Boveri & Cie Ag, 6800 Mannheim Thermisches Überstromrelais

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19325C (de) * E. FiJLLNER in Warmbrunn in Schle- , sien Antriebsvorrichtung an Papierma- J schinen
US1492967A (en) * 1921-03-24 1924-05-06 Connecticut Telephone & Elec Automatic cut-out
US2053934A (en) * 1933-04-25 1936-09-08 Gen Electric Circuit breaker
DE708972C (de) * 1940-01-28 1941-08-01 Stotz Kontakt Gmbh Schaltstueck mit Rechts- und Linksdrehung fuer Kleinselbstschalter
US2952757A (en) * 1958-02-27 1960-09-13 Ellenberger & Poensgen Pushbutton-operated overload switch
US3217125A (en) * 1961-06-07 1965-11-09 Wood Electric Corp Circuit breaker having a cam means for very rapid opening of the contacts
US3413583A (en) * 1966-12-30 1968-11-26 Texas Instruments Inc Circuit breaker
DE1463369A1 (de) * 1964-06-29 1968-12-05 Licentia Gmbh Kleinselbstschalter mit thermischer und gegebenenfalls magnetischer Ausloesung
US3495203A (en) * 1967-10-19 1970-02-10 Diehl Fa Switch
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1373458A (fr) * 1962-10-29 1964-09-25 Thomson Houston Comp Francaise Interrupteur électrique perfectionné, en particulier pour habitations résidentielles

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19325C (de) * E. FiJLLNER in Warmbrunn in Schle- , sien Antriebsvorrichtung an Papierma- J schinen
US1492967A (en) * 1921-03-24 1924-05-06 Connecticut Telephone & Elec Automatic cut-out
US2053934A (en) * 1933-04-25 1936-09-08 Gen Electric Circuit breaker
DE708972C (de) * 1940-01-28 1941-08-01 Stotz Kontakt Gmbh Schaltstueck mit Rechts- und Linksdrehung fuer Kleinselbstschalter
US2952757A (en) * 1958-02-27 1960-09-13 Ellenberger & Poensgen Pushbutton-operated overload switch
US3217125A (en) * 1961-06-07 1965-11-09 Wood Electric Corp Circuit breaker having a cam means for very rapid opening of the contacts
DE1463369A1 (de) * 1964-06-29 1968-12-05 Licentia Gmbh Kleinselbstschalter mit thermischer und gegebenenfalls magnetischer Ausloesung
US3413583A (en) * 1966-12-30 1968-11-26 Texas Instruments Inc Circuit breaker
US3495203A (en) * 1967-10-19 1970-02-10 Diehl Fa Switch
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch

Also Published As

Publication number Publication date
BR7300228D0 (pt) 1973-10-09
NO135114C (xx) 1977-02-09
NO135114B (xx) 1976-11-01
NL7300429A (xx) 1973-07-17
DK144494B (da) 1982-03-15
SE388071B (sv) 1976-09-20
CA970005A (en) 1975-06-24
ES410614A1 (es) 1976-01-01
GB1412831A (en) 1975-11-05
IT978171B (it) 1974-09-20
CH567799A5 (xx) 1975-10-15
DE2300739A1 (de) 1973-07-19
DK144494C (da) 1982-08-30
FR2167437A1 (xx) 1973-08-24
BE793833A (fr) 1973-05-02
FR2167437B1 (xx) 1976-07-23

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