KR20090097033A - Trip mechanism for circuit breaker - Google Patents

Abstract

A trip device for a circuit breaker is provided to rapidly perform a trip operation by moving a trip bar to trip position when a short circuit current occurs. A trip bar(7) is moved to a trip position in order to trip a circuit breaker. A bimetal(5) is curved in order to provide a driving force to the trip bar when an abnormal current occurs. A control screw(9) delivers the driving force of the bimetal to the trip bar. An electromagnet(6) generates a magnetic absorption force when the abnormal current occurs. A trip bar driving device(8) moves the trip bar to a trip position when a short circuit current occurs. One end of an armature(10) is connected to the trip bar driving device. The other end of the armature is absorbed by the magnetic absorption force of the electromagnet.

Description

Trip mechanism of circuit breaker for wiring {TRIP MECHANISM FOR CIRCUIT BREAKER}

The present invention relates to a circuit breaker for home wiring, and more particularly, to a tripping mechanism of a circuit breaker that can prevent the melt and damage of the bimetal due to a short circuit current in the circuit breaker for home wiring.

The circuit breaker for home use has two terminals for connecting the power supply side (commercial power inlet connection side) and two terminals for connecting the load side (indoor wiring connection side) so as to be suitable for single-phase two-wire circuits of alternating current in the home. The breaker for home wiring has a switchgear and a tripping mechanism similar to the breaker for a general industrial wiring, but differs from the breaker for a general industrial wiring in detail. In particular, the trip mechanism has a configuration in which a bimetal (BIMETAL) and a rod-shaped electromagnet are fixed together at a portion where the terminal side connection end of the movable contactor is fixed. In the circuit breaker for home wiring according to the prior art, an approximately Y-shaped trip bar (TRIP BAR) is installed on a path in which the bimetal is bent by an abnormal current so as to generate a trip (automatic breaking operation) for an abnormal current on a circuit. The trip bar is provided with an adjustment screw to adjust the separation distance from the bimetal for adjusting the trip operation sensitivity by the curved bimetal.

In the circuit breaker for home wiring according to the related art, when a short circuit accident occurs in the circuit, the bimetal is bent by the short circuit current and the adjustment screw is pushed to rotate the trip bar, and the restraint on the opening and closing mechanism is released by the rotation of the trip bar. The movable contact is separated from the fixed contact and trips. However, since the circuit breaker for home wiring according to the related art is configured to release the opening and closing mechanism by bending the bimetal by a short circuit current, thermal stress (STRESS) is applied to the bimetal until the opening and closing mechanism of the bimetal is released to cause a trip. If the thermal stress caused by the short circuit current continues to exceed the heat resistance capacity, there is a problem in that the circuit breaker returns to the initial state until the bimetal is replaced after the short circuit accident is melted or damaged so that the breaker performance cannot be exerted.

Accordingly, an object of the present invention is to provide a tripping mechanism of a circuit breaker having a device capable of generating an instantaneous tripping operation before a bimetal when a short circuit current occurs.

An object of the present invention is to provide a tripping mechanism for a circuit breaker.

A trip bar (TRIP BAR) movable to a trip position to trip the circuit breaker;

A bimetal (BIMETAL) which provides a driving force to be bent when an abnormal current is energized to a circuit to drive the trip bar to a trip position;

An adjustment screw installed to be connected to the trip bar to receive the driving force of the bimetal and to transfer the trip bar to the trip bar, and an adjustment screw capable of adjusting a distance from the bimetal;

An electromagnet installed around the bimetal to provide magnetic attraction force when an abnormal current is supplied;

A trip bar driving element connected to the trip bar to move the trip bar in an interlocked manner, and pushing the trip bar to move the trip bar to the trip position more quickly than the bimetal when a short circuit current occurs;

 An armature having an end portion connected to the trip bar driving element to drive the trip bar driving element and the other end sucked by the magnetic attraction force from the electromagnet to receive power for the interlock driving; It can be achieved by providing a trip mechanism of the circuit breaker according to the present invention, characterized in that the configuration.

The trip mechanism of the circuit breaker for wiring according to the present invention is connected to a trip bar so that the trip bar can be interlocked with the trip bar, and a trip bar driving element for pushing and moving the trip bar to move the trip bar to the trip position more quickly than the bimetal when a short circuit current occurs in the circuit. And an armature having one end connected to the trip bar driving element to drive the trip bar driving element and the other end drawn by magnetic attraction force from an electromagnet and receiving power for the interlock driving. In case of short circuit current, the trip bar can be tripped to the trip position faster than the bimetal to cause a trip (circuit break), and the bimetal can be protected from blown or damaged due to thermal stress caused by the short circuit current and the circuit breaker's performance is shorted. Wiring to Maintain Even After Current Shutoff There is an effect that can be obtained breaker.

In the tripping mechanism of the circuit breaker according to the present invention, the trip bar driving element is made of an electrical insulating material, and the armature is made of a metal material which can be sucked by magnetic attraction force, so that the magnetic attraction driving of the armature can be performed quickly when a short circuit current is generated. And the trip bar driving element can be insulated from the short circuit current.

In the tripping mechanism of the circuit breaker for wiring according to the present invention, since the trip bar driving element and the trip bar are connected to each other by adjusting screws, the trip bar driving element is directly connected without time difference due to the movement of the trip bar, so that a trip operation occurs when a short circuit current occurs. This can be achieved quickly.

In the tripping mechanism of a circuit breaker according to the present invention, the trip bar driving element has a connecting groove portion through which one end of the armature can be press-fitted, and the armature is connected to the connecting end portion pressed into the connecting groove portion of the trip bar driving element. Since the structure has an intermediate bent portion to provide an elastic force to maintain the connection with the trip bar drive element, the trip bar drive element and the armature are easy to connect and assemble and the connection structure maintains the elastic structure of the armature itself without additional configuration. It can be achieved by the simplified structure and the manufacturing cost can be obtained.

In the tripping mechanism of the circuit breaker according to the present invention, the electromagnet is composed of an electrical conductor member disposed to surround the bimetal, and the electromagnet is magnetized by a magnetic field induced by the bimetal when current is applied to the bimetal to generate a magnetic attraction force. The magnetic field caused by the energizing current on the circuit flowing through the electromagnet itself and the bimetal induced magnetic field are synthesized around the electromagnet to maximize the generation of magnetic attraction force, so that the amateur is rapidly attracted and the trip operation can be accelerated. Can be.

The object of the present invention and the constitution and effect of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

First, in order to show the overall appearance of the tripping mechanism of the home circuit breaker according to the present invention, see FIG. 1, which is a main perspective view of the main circuit breaker according to the present invention, with the upper cover of the home circuit breaker removed according to the present invention removed. When explaining the main configuration of the tripping mechanism of the circuit breaker for home wiring and the circuit breaker for home wiring according to the present invention.

As shown in Figure 1, the tripping mechanism of the circuit breaker for home wiring according to the present invention is a trip bar (TRIP BAR) (7), bimetal (BIMETAL) (5), adjustment screw (9), electromagnet (6), trip bar drive And an element 8 and an ARMATURE 10.

The trip bar 7 is a device that is movable to a trip position for tripping the circuit breaker, and the opening and closing mechanism of the circuit breaker to be described later for a trip operation to allow the movable contact to be separated from the fixed contact by the elastic force of a trip spring (not shown). The device is rotatable to the trip position to release the restraint of (1). The trip bar 7 has a roughly "Y" shape.

The bimetal 5 is bent in the circuit, i.e., indoor wiring, in which the home circuit breaker is installed, to bend when an abnormal current is energized, and pushes the trip bar 7 to open the trip bar 7 as described above (opening / closing mechanism 1 as described above). It provides a driving force to drive to move to the position} release.

The adjusting screw 9 is installed to be connected to the trip bar 7 so as to receive the driving force of the bimetal 5 and transmit it to the trip bar 7, and the adjusting screw 9 can adjust the distance from the bimetal 5. All. That is, when the adjusting screw 9 is moved forward and the end portion of the adjusting screw 9 facing the bimetal 5 approaches the bimetal 5, the small metal displacement of the bimetal 5 is brought into contact with the bimetal 5 to correspond to the displacement. Therefore, the operation sensitivity is sensitively adjusted to drive the trip bar 7, and the rear end of the adjusting screw 9 is separated from the bimetal 5 by the end of the adjusting screw 9 facing the bimetal 5 from the bimetal 5. The operating sensitivity is insensitively adjusted so as to contact the bimetal 5 only with a large displacement of) and drive the trip bar 7 according to the displacement.

The electromagnet 6 is installed around the bimetal 5 to provide a magnetic attraction force when the abnormal current is energized. The electromagnet 6 is composed of an electrical conductor member installed to surround the bimetal 5 and magnetized by a magnetic field induced by the bimetal 5 when current is applied to the bimetal 5 to generate a magnetic attraction force. In other words, the electromagnet 6 is installed in the external terminal connecting portion 4 by screws together with the movable contactor 3 and the bimetal 5, as shown in Fig. 1, so that the electromagnet ( A magnetic field is formed around 6), and according to the present invention, since the electromagnet 6 is installed to surround the bimetal 5, the magnetic field and the bimetal 5 are caused by the conduction current on the circuit flowing through the electromagnet 6 itself. The induced magnetic field is formed synthetically around the electromagnet to maximize the generation of magnetic attraction force.

The trip bar drive element 8 is connected to the trip bar 7 so that the trip bar 7 can be interlocked with each other, and when the short circuit current occurs in the circuit, the trip bar 7 moves to the trip position more quickly than the bimetal 5. Push the trip bar (7) to move it. Since the trip bar drive element 8 and the trip bar 7 are connected to each other by the adjustment screw 9, the trip of the trip bar drive element 8 is directly linked without time difference by the movement of the trip bar, so that a trip operation occurs when a short circuit current occurs. This can be achieved quickly.

 The armature 10 is attracted by a magnetic suction force from one end connected to the trip bar drive element 8 and the electromagnet 6 to drive the trip bar drive element 8 to receive the power for the interlock drive. It has the other end. The trip bar drive element 8 is made of an electrical insulating material, and the armature 10 is made of a metal material which can be sucked by magnetic attraction force, so that the magnetic bar can be quickly driven by the magnetic force when a short circuit current is generated, and the trip bar is driven. The effect that the element 8 can be insulated from a short circuit current can be obtained.

In FIG. 1, reference numeral 1 denotes an opening / closing mechanism of a circuit breaker, and may not include only an operation handle, but may be included in the opening / closing mechanism, such as a trip spring, a latch, and the like. It may be included in the opening and closing mechanism indicated by 1. In FIG. 1, reference numeral 2 denotes a lower enclosure that accommodates the opening and closing mechanism and the tripping mechanism of the circuit breaker, and reference numeral 3 denotes a movable contactor.

On the other hand, in the trip mechanism of the circuit breaker for home use according to the present invention, Figure 3 is a perspective view of the parts for showing the detailed configuration and assembly of the trip bar drive element and the amateur of the trip mechanism of the circuit breaker for home wiring according to the present invention, Referring to Figure 4 is an assembly state showing the process of assembling the assembly of the bar drive element and the armature will be described in detail the configuration of the trip bar drive element and the armature of the tripping mechanism of the circuit breaker for home according to the present invention.

As shown in Fig. 3, the trip bar drive element 8 has a connection groove portion 8d into which one end of the armature 10 can be pressed. The trip bar drive element 8 is a substantially U-shaped member, which is roughly divided into a trip bar (see reference numeral 7 in FIG. 4) by the adjustment screw (see reference numeral 9 in FIG. 1). In FIG. 3 which is connected to the trip bar connection portion of the upper side and the amateur 10 may be divided into the lower amateur connection portion of the lower side. In the trip bar drive element 8, the trip bar connection portion may have a trip bar connection upper wall portion 8g and a trip bar connection lower wall portion 8h and a trip bar connection left and right as can be seen in FIGS. 3 and 4. Side wall portions 8i and 8j. The trip bar connection left and right side wall portions 8i and 8j are provided with screw insertion holes 8f through which the adjustment screw (see reference numeral 9 in FIG. 1) can be inserted therethrough, as shown in FIG. The inner circumferential surface of the screw inserting portion 8f is provided with a spiral that can be screwed into the adjusting screw (see numeral 9 in FIG. 1). As shown in Fig. 4, the Y-shaped trip bar 7 is formed therein by these trip bar connection upper wall portions 8g, trip bar connection lower wall portions 8h, and trip bar connection left and right side wall portions 8i and 8j. In two of the branches, an accommodating space portion is formed in which the adjusting screw insertion holes (not designated) extending from both sides to the upper side can be accommodated. Accordingly, in the accommodation space portion of the two trip bar drive elements 8, the adjustment screw insertion holes (unsigned) extending from the top to both sides in two branches of the Y-shaped trip bar 7 are pushed in. After positioning the adjusting screw insertion hole (not designated) of the trip bar 7 and the screw insertion hole 8f of the trip bar drive element 8, inserting the adjusting screw (see 9 in FIG. 1). The trip bar 7 and the trip bar drive element 8 may be connected.

 In the trip bar drive element 8, the lower armature connecting portion in Fig. 3 is a wall portion which roughly forms the grooveless connecting groove portion 8d of the letter " T " shape, and the rear wall portion 8a and the left and right side walls. Sections 8b and 8b 'and front left and right wall sections 8c and 8c'. The rear wall portion 8a is horizontally elongated so as to form a corresponding shape in order to accommodate the upper portion of the later described Amateur 10 in the horizontally long shape, and from both side ends of the rear wall portion 8a. In Fig. 3, the horizontal portion of the groove portion of the letter “T” is formed together with the left and right side wall portions 8b and 8b 'extending shortly to the front side. The front left and right wall portions 8c and 8c 'extend from each of the left and right side wall portions 8b and 8b' to the center side and the center portion is opened to form a vertical portion of the groove portion of the letter "T". In each of the front left and right wall portions 8c and 8c ', the inner wall facing the rear wall portion 8a is formed with a contact protrusion 8e protruding toward the rear wall portion 8a. The contact protrusion 8e is a portion which is in elastic contact with the upper connection end of the armature 10 described later.

Meanwhile, referring to FIG. 3, a detailed configuration of the armature 10 is as follows.

As can be seen from Fig. 3, the armature 10 is formed in a shape in which two members of the letter “T” are connected to each other at their vertical lower ends. The armature 10 includes a magnetic force receiving portion 10a, upper and lower inclined extension portions 10c and 10d, an intermediate bending portion 10e and a connecting end portion 10b. The connecting end portion 10b and the upper inclined extension portion 10c of the armature 10 form an upper portion of the two alphabetic “T” shaped members, and the lower inclined extension portion 10d of the armature 10 is formed. And the magnetic force receiving portion 10a form the lower one of the two alphabetic " T " shapes.

The connection end portion 10b is a portion that is press-fitted into the connection groove portion 8d of the trip bar drive element 8 to connect the armature 10 and the trip bar drive element 8.

The upper and lower inclined extension portions 10c and 10d and the intermediate bending portion 10e provide elastic force to maintain the connection with the trip bar drive element 8. That is, the lower inclined extension part 10d and the upper inclined extension part 10c of the armature 10 are inclined in opposite directions with respect to the middle bent part 10e, that is, the upper inclined extension part 10c. ) Is inclined to protrude forward and the lower inclined extension portion 10d is inclined to protrude backward. Accordingly, when the connecting end portion 10b and the upper inclined extension portion 10c are press-fitted into the connecting groove portion 8d of the trip bar drive element 8, the lower inclined extension portion 10d is formed from the rear surface in FIG. Since the lower inclined extension part 10d and the upper inclined extension part 10c are inserted at an angle greater than the original angle formed by the rear surface of the upper inclined extension part 10c, the lower inclined extension part to recover the original angle When the connecting end portion 10b and the upper inclined extension portion 10c are press-fitted into the connecting groove portion 8d of the trip bar drive element 8 by the elastic restoring force of the 10d and the upper inclined extension portion 10c. The armature 10 is not detached from the trip bar drive element 8, and the connection between the armature 10 and the trip bar drive element 8 is firmly maintained.

In order to receive the magnetic attraction force from the electromagnet (see reference numeral 6 in FIG. 4), the magnetic force receiving portion 10a is a large plate-like portion that is more surfaced than the connecting end portion 10b and the vertically inclined extension portions 10c and 10d. 10) is formed on the lower side.

Meanwhile, referring to FIGS. 2 to 6, a process of assembling a tripping mechanism of a circuit breaker for home wiring according to the present invention will be described.

Figure 2 is an assembled state diagram showing the disassembly of the trip mechanism of the circuit breaker for home wiring according to the present invention, Figure 3 is a detailed configuration and assembly of the trip bar drive element and the amateur of the trip mechanism of the circuit breaker for home wiring according to the present invention Figure 4 is a perspective view showing a part, Figure 4 is an assembly state diagram showing a process of assembling the assembly of the trip bar drive element and the armature in the tripping mechanism of the circuit breaker for home according to the present invention, Figure 5 In the trip mechanism of the home circuit breaker according to the present invention, the assembly state diagram showing a process of connecting the assembly of the trip bar drive element and the armature to the trip bar, Figure 6 is a trip mechanism of the home circuit breaker according to the present invention, A guide showing the process of inserting an adjusting screw to connect the bar drive element and the armature assembly to the trip bar. State diagram.

As shown in FIG. 2, in the state where the trip mechanism of the circuit breaker for home wiring according to the present invention is disassembled, as shown in FIG. 3, the connection end part 10b and the upper inclined extension part 10c may be connected to the trip bar driving element ( When press-fitting into the connection groove part 8d of 8), the lower inclination extension part is made into the angle larger than the original angle formed by the back surface of the lower inclination extension part 10d, and the back of the upper inclination extension part 10c in FIG. 10d and the upper inclined extension part 10c are inserted while they are opened, and once connected by the elastic restoring force of the lower inclined extension part 10d and the upper inclined extension part 10c to restore the original angle. And when the upper inclined extension portion 10c is press-fitted into the connection groove portion 8d of the trip bar drive element 8, the armature 10 is not separated from the trip bar drive element 8 and is firmly armature. The connection between the 10 and the trip bar drive element 8 is maintained. Thus, an assembly of trip bar drive element 8 and amateur 10 as shown in FIG. 4 is obtained.

Next, as shown in FIG. 5, the trip bar drive element is positioned in the state where the upper end of the bimetal 6 is positioned between the upper trip bar connection part of the outline U-shaped trip bar drive element 8 and the lower amateur connection part. In the accommodation space portion of (8), the adjustment screw insertion holes (unsigned) extending from the upper side to the two Y-shaped branches of the trip bar 7 are pushed in to adjust the adjustment bar of the trip bar 7. The insertion hole (unsigned) and the screw insertion hole 8f of the trip bar drive element 8 are positioned in communication with each other.

Next, as shown in FIG. 6, the adjusting screw (see numeral 9 of FIG. 1) is used to adjust the screw insertion hole (unsigned) of the trip bar 7 and the screw insertion hole 8f of the trip bar drive element 8. By inserting through), the assembly of the trip bar drive element 8 and the armature 10 and the trip bar 7 are made, thereby completing the assembly of the trip mechanism of the circuit breaker for household wiring according to the present invention.

7 and 8 are main part operation state diagrams for explaining the operation of the tripping mechanism of the home circuit breaker according to the present invention, and the operation of the tripping mechanism of the home circuit breaker according to the present invention will be described with reference to FIGS. 7 and 8. The explanation is as follows.

In the case where a steady current flows through a circuit in which a circuit breaker for home wiring according to the present invention is installed, for example, an energizing circuit formed by indoor wiring and a load device, as shown in FIG. Since the magnetic attraction force by the synthesized magnetic field applied to the magnetic force receiving portion 10a of (10) is much smaller than when a short circuit current is generated, the magnetic force receiving portion 10a hardly moves toward the electromagnet 6. Therefore, the trip bar drive element 8 connected via the upper connection end 10b of the armature 10 hardly moves to the side for driving the trip bar 7 to the trip position. Thus, normal energization is achieved.

In addition, when an overcurrent of about 120% of the rated current is energized in the circuit, the bimetal 5 is bent to pressurize the trip bar drive element 8, so that the trip bar 7 passes through the trip bar drive element 8. Is rotated to the trip position and thus the circuit breaker for home wiring according to the present invention can be tripped. However, even in such an overcurrent state, the magnetic attraction force due to the synthetic magnetic field applied to the magnetic force receiving portion 10a of the armature 10 by the bimetal 5 and the electromagnet 6 is much smaller than the occurrence of the short circuit current. Hardly moves toward the electromagnet 6.

On the other hand, when the short-circuit current, for example, several times to several tens of the rated current is energized in the circuit, before the bimetal 5 is curved to pressurize the trip bar drive element 8, the bimetal 5 and the electromagnet 6 Since the magnetic attraction force by the synthetic magnetic field applied to the magnetic force receiving portion 10a of the armature 10 is much stronger than the normal current or overcurrent energization, the magnetic force receiving portion 10a is shown in FIG. It moves momentarily toward the electromagnet 6. Therefore, the trip bar drive element 8 connected via the upper connection end 10b of the armature 10 also moves to drive the trip bar 7 to the trip position. Therefore, the circuit breaker for home wiring according to the present invention is tripped and the conduction path between the power supply side (inlet power supply side) and the indoor wiring and the load equipment side is cut off.

As described above, since the trip by the trip mechanism according to the present invention is instantaneously before the bending of the bimetal 5 when the short circuit current is energized, the damage or fusing of the bimetal 5 due to the long time energization of the short circuit current can be prevented.

1 is a perspective view of a main part of a circuit breaker for home wiring according to the present invention, in which the upper cover of the circuit breaker for household wiring according to the present invention is removed in order to show the overall appearance of the tripping mechanism of the circuit breaker for household wiring according to the present invention;

2 to 6 is an assembly process diagram showing a process of assembling the tripping mechanism of the circuit breaker for home wiring according to the present invention,

2 is an assembled state diagram showing a disassembled tripping mechanism of the circuit breaker for home wiring according to the present invention;

Figure 3 is a perspective view of parts for showing the detailed configuration and assembly of the trip bar drive element and the armature of the trip mechanism of the circuit breaker for home wiring according to the present invention,

4 is an assembly state diagram illustrating a process of assembling an assembly of a trip bar driving device and an armature in a trip mechanism of a circuit breaker for household wiring according to the present invention;

5 is an assembly state diagram illustrating a process of connecting an assembly of a trip bar driving device and an amateur to a trip bar in a trip mechanism of a circuit breaker for home wiring according to the present invention;

6 is an assembly state diagram illustrating a process of inserting an adjustment screw to connect an assembly of a trip bar driving device and an amateur to a trip bar in a trip mechanism of a circuit breaker for home wiring according to the present invention;

7 and 8 are main part operation state diagrams for explaining the operation of the tripping mechanism of the circuit breaker for home wiring according to the present invention;

7 is a main operation state diagram showing a state before the trip mechanism of the circuit breaker for household wiring according to the present invention to generate a trip driving force,

8 is a main operation state diagram showing a state in which the trip bar driving element drives the trip bar by the movement of the armature by the electromagnet in the trip mechanism of the circuit breaker for home wiring according to the present invention.

* Explanation of symbols on the main parts of the drawings

1: switchgear 2: lower enclosure

3: movable contact 4: external terminal connection

5: bimetal 6: electromagnet

7: Trip bar 8: Trip bar drive element

8a: rear wall part 8b, 8b ': left and right side wall parts

8c, 8c ': front left and right wall portions 8d: connection groove portion

8e: contact stone part 8f: screw insertion bend

8g: trip bar connection upper wall part 8h: trip bar connection lower wall part

8i, 8j: Trip bar connection left and right side wall parts

9: Adjustment screw 10: Amateur

10a: magnetic force receiving part 10b: connection end

10c, 10d: vertically extending section

10e: middle break

Claims (6)

In the tripping mechanism of the circuit breaker, A trip bar (TRIP BAR) movable to a trip position to trip the circuit breaker; A bimetal (BIMETAL) which provides a driving force to be bent when an abnormal current is energized to a circuit to drive the trip bar to a trip position; An adjustment screw installed to be connected to the trip bar to receive the driving force of the bimetal and to transfer the trip bar to the trip bar, and an adjustment screw capable of adjusting a distance from the bimetal; An electromagnet installed around the bimetal to provide magnetic attraction force when an abnormal current is supplied; A trip bar driving element connected to the trip bar to move the trip bar in an interlocked manner, and pushing the trip bar to move the trip bar to the trip position faster than the bimetal when a short circuit current occurs in a circuit;  Including an armature having an end portion connected to the trip bar driving element to drive the trip bar driving element and the other end is sucked by the magnetic attraction force from the electromagnet to receive power for the interlock drive; The tripping mechanism of the circuit breaker characterized by the above-mentioned. The method of claim 1, And the trip bar drive element and the trip bar are connected to each other by the adjustment screw. The method of claim 1, The trip bar driving device is composed of an electrical insulating material, and the armature is a tripping mechanism of a circuit breaker, characterized in that composed of a metal material that can be sucked by the magnetic attraction force. The method of claim 1, And the electromagnet is configured to surround the bimetal and is constituted by an electrical conductor member which is magnetized by a magnetic field induced by the bimetal to display a current through the bimetal to generate a magnetic attraction force. The method of claim 1, The trip bar driving device has a connection groove portion through which one end of the armature can be press-fitted, The amateur is A connection end portion press-fitted into the connection groove portion of the trip bar driving element; And a vertical bending portion and an intermediate bending portion so as to provide an elastic force to maintain a connection with the trip bar driving element. The method of claim 5, The amateur is And a magnetic force receiving portion on a wider plate on the lower side in order to receive the magnetic attraction force from the electromagnet.

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