US3309635A - Circuit breaker with improved thermal and electromagnetic trip means - Google Patents

Circuit breaker with improved thermal and electromagnetic trip means Download PDF

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Publication number
US3309635A
US3309635A US458248A US45824865A US3309635A US 3309635 A US3309635 A US 3309635A US 458248 A US458248 A US 458248A US 45824865 A US45824865 A US 45824865A US 3309635 A US3309635 A US 3309635A
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United States
Prior art keywords
bimetal
heater
heater member
magnet
circuit
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Expired - Lifetime
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US458248A
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English (en)
Inventor
Eugene J Walker
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.)
CBS Corp
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Westinghouse Electric Corp
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Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US458248A priority Critical patent/US3309635A/en
Priority to BE681510D priority patent/BE681510A/xx
Priority to JP1966047868U priority patent/JPS4531729Y1/ja
Priority to FR62782A priority patent/FR1485774A/fr
Application granted granted Critical
Publication of US3309635A publication Critical patent/US3309635A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H71/405—Combined electrothermal and electromagnetic mechanisms in which a bimetal forms the inductor for the electromagnetic mechanism

Definitions

  • This invention relates generally to circuit breakers and more particularly to circuit breakers of the type comprising therinal-and-magnetic trip means.
  • An object of this invention is to provide a circuit breaker embodying an improved thermal-and-magnetic trip device.
  • Another object of this invention is to provide a circuit breaker comprising an improved thermal-and-magnetic trip device of the type comprising an indirectly heated tripping bimetal.
  • the magnetic air gap between the magnet members of the electromagnet diminishes as the bimetal flexes toward a tripping position so that it is possible to have a combination thermal-and-magnetic tripping operation wherein the bimetal starts to flex upon the occurrence of low overload currents during which flexing movement the magnetic air gap is decreased to such a dimension that the magnet force serves to complete the tripping operation.
  • another object of this invention is to provide an improved circuit breaker having a compact thermal-and-magnetic trip device that comprises'an electromagnet trip comprising one member that fiexes upon the occurence of severe overloads to effect a magnetic tripping operation in which one member supports a bimetalmember that flexes independently of the one member upon the occurrence of lesser overloads to effect a thermal tripping operation.
  • Another object of this invention is to provide a circuit breaker embodying an improved ambient-temperature compensating trip device.
  • FIGURE 1 is a vertical sectional view through the center pole of a three-pole circuit breaker embodying the principles of this invention
  • FIGURE 2 is a partial side elevational view of the thermal-and-magnetic trip device seen in FIG. 1;
  • FIGURE 3 is a top View of the parts of the thermaland-magnetic trip device seen in FIG. 2.
  • the circuit breaker is of the three-pole type, only one pole being shown, and it comprises a base 11 and a cover 13 both of molded insulating material.
  • a stationary contact 15 and a cooperating movable contact 17 are provided for each pole of the breaker.
  • An operating mechanism 19 common to all of the poles is diposed in the center pole compartment (FIG. 1) and each pole is provided with a trip device indicated generally at 21.
  • the stationary contact 15 for each pole of the breaker is rigidly mounted on the inner end of a conducting strip 23.
  • the outer end of the strip 23 is secured by means of a line terminal connector 25to a metal insert molded in the base 11.
  • the movable contact 17 'for each of the poles is mounted on a separate contact arm 27 whichis pivotally mounted by means of a pin 29 on a switch arm 31.
  • the switch arm 31 for the several poles are secured to an insulating tie bar 35 which is pivotally supported in brackets (not shown) by means of pins 37 in the ends of the tie bar. Springs 34 bias the contact arms 27 clockwise about the pins 29 to provide contact pressure in the closed position of the switch arms.
  • the operating mechanism 19 is disposed in the center pole.
  • the mechanism 19 comprises a U-shaped operating lever 41 having its inner ends pivoted in V-shaped notches 43 in a pair of spaced metal frame members 45 that are suitably mounted on the base 11.
  • the operating lever 41 has an arcuate shield 47 mounted on the outer end thereof.
  • a handle portion 49 extends out from the shield 47 through an opening 51 in the cover 13.
  • the switch arm 31 for the center pole is operatively connected, by means of a toggle comprising links 53 and 55, to a releasable member or cradle 57 that is pivotally mounted on a pin 59 that is supported in the frames 45.
  • the toggle links 53 and are pivotally connected together by a knee pivot pin 61.
  • the toggle link 53 ispivotally connected to the releasable cradle 57 by a pivot pin 63 and the toggle link 55 is pivotally connected by a pin 65 to the switch arm 31 for the center pole.
  • Overcenter springs 67 are connected under tension be-; tween the knee pivot pin 61 of the toggle 53, '55 and the yoke portion of the operating lever 41.
  • the contacts for all of the poles are manually opened and closed in a well known manner by movement of the operating lever 41 to the of position and then back to the on position. Movement of the lever 41 to the oil position causes collapse of the toggle 53, 55 and opening of the contacts 15, 17.
  • the tie bar 35 is rotated in a counterclockwise (FIG. 1) direction to simultaneously move all of the contacts 17 to the open position. Reverse movement of the handle back to the on position causes straightening of the toggle 53, 55 and closing of the contacts 15, 17.
  • the tie bar 35 is rotated in a clockwise (FIG. 1) direction to simultaneously move all of the contacts 17 to the closed (FIG. 1) position.
  • the contacts are opened automatically in response to a tripping overload in any pole of the breaker, by release of the releasable cradle 57.
  • the cradle is normally releasably restrained in operative position by means of a latch mechanism indicated generally at 71.
  • the latch mechanism is actuated by the trip device 21 to release the cradle 57.
  • the cradle 57 rotates clockwise about its pivot 59 under the influence of the Overcenter springs 67 causing collapse of the toggle 53, 55 and opening movement of the switch arms 31.
  • the latch mechanism comprises a main latch 73 pivoted on a pin 75 in the frame 45 and biased by a spring 77 in unlatching direction.
  • the main latch 73 is provided with a latching portion 79 that engages a latch tip 81 on the free or latching end of the cradle 57 to releasably hold the cradle in operative position.
  • the latch tip 81 is in-turned and faces generally in the direction toward the pivot 59 about which the cradle moves.
  • the latch 73 is of the slip-off type and is releasably held in latching position by a light-load cylindrical latch which comprises a rotary shaft 83 pivotally mounted in the frame 45 and having a cutout portion 85.
  • the shaft 83 engages a shoulder on the main latch 73.
  • the latch 83 has an upwardly extending arm 89 secured thereto which, at its upper end, has an ear 91 formed thereon.
  • An adjusting screw 93 is threaded into the car 91 and is movable into engagement with a projection 97 on a trip bar 99.
  • a spring 95 biases the arm 89 and the rotary shaft 33 to the latching position where the arm 09 is stopped by engagement of the screw 93 with the projection 97 on the trip bar.
  • the trip bar 99 is of molded insulating material and the projection 97 is molded integral therewith.
  • the trip bar 99 is pivotally supported by means of pins 101 molded in the ends thereof which pins are supported in brackets (not shown) in the end poles of the breaker adjacent the sidewalls of the housing.
  • the trip bar 99 is provided with a downwardly extending projection 105 for each pole on which is rigidly mounted an ambient temperature compensating bimetal element 107 that is adapted to be mechanically actuated by the trip device 21 to operate the trip bar 99.
  • the trip device 21 comprises a generally L-shaped heater member 111 and a generally L-shaped magnet member 113.
  • the members 111 and 113 are mounted on the base 11 by means of a screw 115 that passes through suitable openings in the horizontal (FIG. 1) legs of the members 111, 113 and that is threaded into a metallic insert 117.
  • the insert 117 is fixedly mounted on the base 111 and is provided with a tapped opening therein for receiving the screw 115.
  • the member 113 is a magnetically permeable member that serves as one of two magnetically permeable members that cooperate to form an electromagnet.
  • the member 111 is a conductor that is connected in the circuit of the breaker.
  • the member 111 is connected to a conductor 121 by means of the screw 115 which fastens these mmebers together.
  • the conductor 121 is a generally L-shaped member and it is connected to the contact arm 27 of the-associated pole by means of a plurality of flexible conductors 123.
  • the conductors 123 are connected at one end thereof to the contact arm 27 and at the other end thereof to a flag portion 125 of the conductor 121.
  • the upper end of the heater member 111 is connected to a conductor 129 that is connected to a terminal conductor 131.
  • the terminal conductor 131 extends out through an opening in the insulating housing, and a terminal connecting screw structure 135 is provided to enable connection of the terminal conductor 131 to a conducting line.
  • a tripping bimetal 139 is secured at the lower end thereof to a lower portion of the heater member 111 by means of a rivet 141.
  • the tripping bimetal 131 is an elongated generally flat member that extends upward along one side of the elongated generally flat heater member 111.
  • the tripping bimetal 139 passes between the legs of a generally U-shaped magnet member 145 that is secured at the bight portion thereof to the member 111. As can be seen in FIGS. 1-3 the legs of the magnet member 145 extend toward the magnet member 113.
  • Each of the magnet members 145 and 113 comprises a member of magnetically permeable material such as soft iron.
  • An adjusting screw structure 149 is mounted on the upper or free end of the tripping bimetal 139. The adjusting screw structure 149 is rotatable in order to adjust the dimension of the gap between the adjusting screw structure 149 and the compensating bimetal 107.
  • the high expansion sides of the compensating bimetal 107 and tripping bimetal 139 are on the left as seen in FIG. 1 and both of these bimetal elements will deflect to the right (FIG. 1) in response to changes in ambient temperature whereby the compensating bimetal element 107 will compensate for deflection of the tripping bimetal 139 in response to changes in the ambient temperature.
  • the tripping bimetal 139 is disposed between the heater 111 and the compensating bimetal 107.
  • the magnet member 113 is also positioned between the heater 111 and compensating bimetal 107.
  • the tripping bimetal 139 and also the magnet member 113 serve to shield the compensating bimetal 107 from the heat of the heater member 111.
  • the bimetal element 139 When a low persistent thermal tripping overload current such, for example, as of the rated current occurs, the bimetal element 139 is heated by a means of the heat generated in the current-carrying heater member 111, and the bimetal 139 deflects to the right (FIG. 1) to trip the circuit breaker after a time delay.
  • This tripping movement of the tripping metal 139 operates through the engagement of the adjusting screw structure 149 and compensating bimetal 107 to rotate the trip bar 99 in a clockwise (FIG. 1) direction during which movement the projection 97 on the trip bar 99 operates against the screw 93 to rotate the latch member 89 in a clockwise direction to free the main latch 73.
  • the main latch 73 is free when a shoulder portion thereof snaps into the notch of opening 85 in the shaft 83.
  • the latching point of the main latch 73 and the latch portion 81 of the cradle 57 are to the left of the pivot 75 so that the main latch 73 is biased in an unlatching direction by a component of the force exerted by the overcenter springs 67 as well as by means of the torsion spring 77.
  • the main latch 73 is released by the light load trigger latch 83, the main latch is immediately snapped to the unlatching position releasing the cradle or releasable member 57 to effect opening of the contacts 15, 17 in the same manner hereinbefore described.
  • the tripping'bimetal 139 moves independent of the heater member 111 and magnet member so that during the thermal flexing movement of the bimetal 139 the air gap between the magnet members 145, 113 is not diminished.
  • the bimetal 139 is supported on and disposed adjacent the current conducting heater member 111 to be heated by means of the heat generated in the heater member 111.
  • the heat from the heater member 111 is conducted to the tripping bimetal 139 at the lower part of the tripping bimetal 139 because of the lower part of the tripping bimetal 139 is supported on the heater member 111 in heat conducting engagement with the lower part 153 of the heater member 111.
  • the heat from the heater member 111 is also radiated to the upper part 155 of the bimetal 139 through the air gap between the heater member 111 and the upper part 155 of the bimetal 139.
  • the force of the overcenter springs 67 operates to move the operating handle 49 to a tripped position intermediate the on and off positions in a manner well known in the art to provide a visual indication that the circuit breaker has been tripped.
  • the lower rounded portion of the latch end 81 of the cradle 57 engages the outwardly extending arm of the bell-crank shaped latch member 73 to move the latch member 73 to the latching position.
  • the torsion spring 95 restores the arm 89 and shaft 83 to the normal latching position.
  • the latching portion 79 of the latch 73 is then above the latch 81 and upon release of the handle 49 the latch '81 Upon the occurrence of a severe or magnetiotripping overload such, for example, as ten times the normal rated current, the electromagnet 111, 145, 113 is energized by means of the current flowing through the member 111 and, therefore, throughthe legs of the U-shaped magnet mmeber 145, to effect an instantaneous magnetic tripping operation.
  • a severe or magnetiotripping overload such, for example, as ten times the normal rated current
  • the magnet member 113 is stiff relative to the heater member 111 so that when the electromagnet is energized sufficiently to effect a magnetic tripping operation the magnet member 145 is attracted to the stationary stiff magnet member 113 flexing the heater member 111 to move the heater member 111 to the right (FIG. 1) to a tripping position.
  • This tripping movement of the heater member 111 moves the bimetal 113 that is mounted on the right-hand side (FIG. 1) of the heater member 111 whereupon the adjusting screw structure 149 on the bimetal 139 engages the compensating bimetal 107 to rotate the trip bar 99 to effect a tripping operation in the same manner as was hereinbefore set forth with regard to the thermal-tripping operation.
  • the magnetic tripping operations occur instantaneously upon the occurrence of a severe overload'or short circuit such, for example, asa current often or more times the normal ratedcurrent of the circuit breaker.
  • the thermal tripping operations which occur upon the occurrence of certain overloads below the overload that will effect a magnetic tripping operation, occur with a time-delay so that in some situations when the overload current condition is a temporary condition that will not damage the parts of the protected circuit, the circuit breaker will not trip.
  • the thermal-and-magnetic trip device 21 comprises a compact trip device that is readily mounted in position by means of the mounting screw 115 that mounts the members 111, 113 and 121 on the base 11 of the circuit breaker.
  • the tripping bimetal 139 is heated by means of the heat generated in the conducting heater member 111. When heated sufliciently the tripping bimetal flexes, Without diminishing the magnetic air gap of the electromagnet trip structure, to effect a thermal tripping operation.
  • the compact thermal-and-magnetic trip device is used in a combination wherein the tripping bimetal and one magnetic member are disposed between the heater member and a compensating bimetal to shield the compensating bimetal from the heat generated in the heater member.
  • the thermal-and-magnetic trip device is a simplified structure that is easily assembled in that the one magnetic member and bimetal can be fixedly assembled on the heater member outside of the circuit breaker housing, and this assembled structure can be readily mounted in the circuit breaker along with the other magnetic member by means of a screw that also serves to connect the heater member in the circuit of the breaker.
  • a circuit breaker comprising a pair of contacts and means releasable to effect opening of said contacts to thereby eifect opening of a circuit
  • trip means comprising a movable current-carrying heater member connected in said circuit, a bimetal member supported to be heated by the heat generated in said heater member, upon the occurrence of certain overload current conditions below a predetermined value in said circuit said bimetal member flexing independent of movement of said heater member to effect release of said releasable means, means operatively connecting said heater member with said himetal member such that operative movement of said heater member operatively moves said bimetal memben an electromagnet comprisinga stationary magnet member and a movable magnet member, said stationary and movable magnet members being supported to be energized by the current in said circuit, means operatively connecting said movable magnet member with said heater member such that operative movement of said movable magnet member operatively moves said heater member, and upon the occurence of an overload current above said predetermined value said movable
  • a circuit breaker comprising a pair of contacts and. means releasable to effect opening of said contacts to thereby efiect opening of a circuit
  • trip means comprising a movable current-carrying heater member connected in said circuit, an electromagnet comprisinga first magnet member and a second magnet 'member, one of said first and second magnet members being mounted on said heater member, the other of said first and second magnet members being supported in proximity to said one magnet member, upon the occurrence of an overload current above a predetermined value in said circuit said electromagnet being energized to such an extent by the current in said heater member that said one magnet member is moved toward said other magnet member, which movement of said one magnet member operates to move said heater member to thereby effect release of said releasable means, a bimetal member supported to be heated by the heat generated in said heater member, upon the occurrence of certain overload current conditions below said predetermined value said bimetal member being heated sufficiently to flex and move independent of movement of said heater member to effect release of said relea
  • a circuit breaker comprising a pair of contacts and means releasable to effect opening of said contacts to thereby effect opening of a circuit
  • trip means comprising an elongated movable current-carrying heater member connected in said circuit, an elongated bimetal member supported at one end thereof on said elongated heater member and extending alongside said elongated heater member to be heated by the heat generated in said heater member, upon the occurrence of certain current .conditions below a predetermined value said bimetal member being heated sufficiently to flex to move independent of said heater member to effect release of said releasable means, an electromagnet comprising a stationary magnet member and a movable magnet member, said stationary and movable magnet members being supported to be magnetically energized by the current in said circuit, means operatively connecting said movable magnet member with said heater member such that operative movement of .said movable magnet member operatively moves said heater member, and upon the occurrence of an overload current above said predetermined value said movable magnet
  • a circuit breaker comprising'a pair of contacts and means releasable to eflect opening of said contacts to thereby effect opening of a circuit
  • trip means comprising an elongated current-carrying flexible heater member connected in said circuit, an electromagnet comprising a first magnet member and a second magnet member, one of said first and second magnet members comprising a generally U-shaped magnet member supported on said heater member with said heater member being positioned between the legs of said U-shaped magnet member, the other of said magnet members being supported in proximity to the free ends of the legs of said U-shaped magnet member, upon the occurrence of.
  • an overload current above a predetermined value in said circuit said electromagnet being energized suificiently to effect movement of said U-shaped magnet member toward said other magnet member whereupon said movement of said U-shaped magnet member flexes said heater member to move said heater member to a tripping position to eflfect release of said releasable means, an elongated bimetal member supported at one end thereof on said heater member and extending alongside said heater member, upon the occurrence of certain overload current conditions "below said predetermined value said bimetal member being heated and flexing'independent of movement of said heater member to effect release of said releasable means.
  • a circuit breaker comprising 'an insulating housing comprising a base, a circuit-breaker mechanism supported within said housing, said circuit-breaker mechanism comprising a pair of contacts and means releasable to effect opening of said contacts to thereby effect opening of a circuit, a trip member operatively movable to effect release of said releasable means, a thermal'andmagnetic trip device comprising a generally L-shaped conducting heater member connected in said circuit, said heater member comprising a horizontalleg and a flexible vertical leg, an electromagnet comprising a first magnet member and a second magnet member, one of said first and second magnet members being mounted on the vertical leg of said heater member, the other of said magnet members comprising a generally L-shaped magnet member comprising a generally horizontal leg and a generally vertical leg, said other of said magnet members being mounted with the generally vertical leg thereof being adjacent said one magnet member, a mounting screw mounting said other magnet member and said heater member in said circuit breaker bysecuring the generally horizontal legs thereof one over the other to said base,
  • a circuit breaker comprising an insulating housing and a circuit-braker mechanism supported within said housing, said circuit-breaker mechanism comprising a pair of contacts and means releasable to efiect opening of said contacts, a trip structure supported in said housing and comprising a vpivotally supported trip bar and an elongated compensating bimetal member supported at one end thereof on said trip bar, said trip structure being operatively movable to effect release of said releasable means, a thermal-and-magnetic trip device comprising a generally L-shaped heater member comprising a flexible vertical leg and a horizontal leg, said trip device comprising a generally L-shaped magnet member comprising a vertical leg and a horizontal leg, at fastening member fastening the horizontal'leg of said heater member and the horizontal leg of said L-shaped magnet member to said housing, a generally U-shaped magnet member supported on the flexible vertical leg of said heater member with the flexible vertical leg of said heater member extending between the legs of said generally U-shaped magnet member,
  • metal member comprising an adjusting screw.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
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US458248A 1965-05-24 1965-05-24 Circuit breaker with improved thermal and electromagnetic trip means Expired - Lifetime US3309635A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US458248A US3309635A (en) 1965-05-24 1965-05-24 Circuit breaker with improved thermal and electromagnetic trip means
BE681510D BE681510A (nl) 1965-05-24 1966-05-24
JP1966047868U JPS4531729Y1 (nl) 1965-05-24 1966-05-24
FR62782A FR1485774A (fr) 1965-05-24 1966-05-24 Disjoncteur

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US458248A US3309635A (en) 1965-05-24 1965-05-24 Circuit breaker with improved thermal and electromagnetic trip means

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US3309635A true US3309635A (en) 1967-03-14

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JP (1) JPS4531729Y1 (nl)
BE (1) BE681510A (nl)
FR (1) FR1485774A (nl)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114547A1 (de) * 1980-04-15 1982-08-19 Westinghouse Electric Corp., 15222 Pittsburgh, Pa. "trennschalter mit uebertemperatur-ausloeseeinrichtung"
US4716325A (en) * 1986-11-06 1987-12-29 Autotrol Corporation Disengageable one-way mechanism for synchronous motors
DE4300909A1 (de) * 1993-01-15 1994-07-21 Abb Patent Gmbh Thermischer Auslöser, insbesondere für einen Leitungsschutzschalter
US5844188A (en) * 1996-12-19 1998-12-01 Siemens Energy & Automation, Inc. Circuit breaker with improved trip mechanism
US5866996A (en) * 1996-12-19 1999-02-02 Siemens Energy & Automation, Inc. Contact arm with internal in-line spring
US5894260A (en) * 1996-12-19 1999-04-13 Siemens Energy & Automation, Inc. Thermal sensing bi-metal trip actuator for a circuit breaker
US6087914A (en) * 1996-12-19 2000-07-11 Siemens Energy & Automation, Inc. Circuit breaker combination thermal and magnetic trip actuator
US20100164676A1 (en) * 2008-12-31 2010-07-01 Ls Industrial Systems Co, Ltd. Trip device
EP3048632A1 (en) * 2015-01-20 2016-07-27 Siemens Aktiengesellschaft Method for operating a circuit breaker and circuit breaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5381120A (en) * 1993-11-15 1995-01-10 General Electric Company Molded case circuit breaker thermal-magnetic trip unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892054A (en) * 1956-11-30 1959-06-23 Westinghouse Electric Corp Circuit breaker
US3185792A (en) * 1961-05-24 1965-05-25 Gen Electric Circuit breaker trip mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892054A (en) * 1956-11-30 1959-06-23 Westinghouse Electric Corp Circuit breaker
US3185792A (en) * 1961-05-24 1965-05-25 Gen Electric Circuit breaker trip mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114547A1 (de) * 1980-04-15 1982-08-19 Westinghouse Electric Corp., 15222 Pittsburgh, Pa. "trennschalter mit uebertemperatur-ausloeseeinrichtung"
US4716325A (en) * 1986-11-06 1987-12-29 Autotrol Corporation Disengageable one-way mechanism for synchronous motors
DE4300909A1 (de) * 1993-01-15 1994-07-21 Abb Patent Gmbh Thermischer Auslöser, insbesondere für einen Leitungsschutzschalter
US5844188A (en) * 1996-12-19 1998-12-01 Siemens Energy & Automation, Inc. Circuit breaker with improved trip mechanism
US5866996A (en) * 1996-12-19 1999-02-02 Siemens Energy & Automation, Inc. Contact arm with internal in-line spring
US5894260A (en) * 1996-12-19 1999-04-13 Siemens Energy & Automation, Inc. Thermal sensing bi-metal trip actuator for a circuit breaker
US6087914A (en) * 1996-12-19 2000-07-11 Siemens Energy & Automation, Inc. Circuit breaker combination thermal and magnetic trip actuator
US20100164676A1 (en) * 2008-12-31 2010-07-01 Ls Industrial Systems Co, Ltd. Trip device
US8274355B2 (en) * 2008-12-31 2012-09-25 Ls Industrial Systems Co., Ltd. Trip device
EP3048632A1 (en) * 2015-01-20 2016-07-27 Siemens Aktiengesellschaft Method for operating a circuit breaker and circuit breaker

Also Published As

Publication number Publication date
FR1485774A (fr) 1967-06-23
JPS4531729Y1 (nl) 1970-12-04
BE681510A (nl) 1966-10-31

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