KR20170121552A - Trip device for molded case circuit breaker - Google Patents

Abstract

The present invention relates to a trip device of a circuit breaker. An objective of the present invention is to increase pulling power of a trip device even under a low operating current to induce a stable operation of an armature to improve interrupting performance of a trip device of a circuit breaker for wiring. To achieve the objective, the trip device of a circuit breaker for wiring comprises: a magnet installed adjacent to a heater or bimetal and made of a ferromagnetic substance to be magnetized by a fault current flowing through the heater or the bimetal; a supporter fixed to the magnet, the heater, or an outer box of a circuit breaker for wiring; an armature rotatably installed on the supporter to rotate towards the magnet by a magnetic force of the magnet to move an opening/closing apparatus to a trip position; an elastic member installed between the supporter and the armature to elastically support the armature in an opposite direction of the magnet; and at least one auxiliary armature installed on a surface of the armature facing the magnet.

Description

TRIP DEVICE FOR MOLDED CASE CIRCUIT BREAKER

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker for a wiring breaker, and more particularly, to a trip device of a circuit breaker for detecting a fault current such as a short circuit and guiding the opening /

The MCCB (Molded-Case Circuit Breaker) is a unit in which an opening / closing mechanism and a trip device are integrally assembled in an insulating container. Normally, the converter can be opened or closed manually or by an external electric control device, It is an electric device that can automatically trip the inverter.

1, a conventional circuit breaker according to the prior art comprises an enclosure 10, a fixed contact (not shown) provided in the enclosure 10 and electrically connected to a power supply side 20, a movable contact 30 electrically connected to a load side not shown and rotatably installed so as to be electrically connected or disconnected to the fixed contact 20, a movable contact 30 connected to the closing position A trip device 50 that automatically induces a shut-off operation of the opening / closing mechanism 40 in response to an accidental current such as an abnormal current such as an overload or a short circuit, a movable contact 30 And an SOHO device 60 disposed on the moving path of the movable contact 30 so as to extinguish an arc generated between the stationary contactor 20 and the movable contact 30 when the movable contact 30 is disconnected.

The trip device 50 is a so-called thermo-electronic (electromagnetic) trip device that detects an abnormal current such as an overload by using deformation of a bimetal which is deformed when an overcurrent flows on a circuit, A thermal-motion detection mechanism unit 70 that induces a shut-off operation of the opening / closing mechanism 40 after detecting a fault current such as a short circuit by using a magnetic force induced when a large current flows on the circuit; And an electronic detection mechanism unit 80.

FIG. 2A is a schematic view of a trip device of a conventional circuit breaker, FIG. 2B is an exploded perspective view of FIG. 2A, FIG. 3A is a schematic view of another trip device of a conventional circuit breaker, It is a perspective view.

1 and 2B, the thermal-motion detection mechanism unit 70 of the trip device 50 includes a heater 71 having one end electrically connected to the movable contact 30 and the other end connected to a load, And a bimetal 72 fixed to be in contact with the heater 71.

The bimetal 72 is indirectly heated (indirectly heated) by the heating of the heater 71 to which the overcurrent is applied so as to be curved toward the crossbar 41. At the upper end of the bimetal 72, A rod 73 for contacting the cross bar 41 of the opening and closing mechanism 40 and for rotating the cross bar 41 in the counterclockwise direction is provided.

1 to 2B, a high rated current is usually applied to the heater 71, and a low rated current may be applied in some cases.

However, in the case where only a low rated current is applied to the wiring breaker, the heater 71 is omitted as shown in Figs. 3A and 3B, and one end is electrically connected to the movable contact 30 and the other end is connected to the load The bimetal 72 may be directly heated by the overcurrent applied to the bimetal 72 so that the bimetal 72 is curved toward the crossbar 41.

1 to 3B, the electronic detection mechanism unit 80 includes: A magnet 81 formed adjacent to the heater 71 or the bimetal 72 and formed of a ferromagnetic material such as a steel material so as to be magnetized by an accident current such as a short-circuit current flowing through the heater 71 or the bimetal 72, A supporter 82 fixed to the supporter 82 and rotatably mounted on the supporter 82 so as to be pivoted to the magnet 81 side by the magnetic force of the magnet 81 to turn the switching device 40 An elastic member 83 such as a spring 84 installed between the supporter 82 and the armature 83 so as to elastically support the armature 83 in a direction opposite to the magnet 81, .

Here, the spring 84 does not move due to the attracting force of the magnet 81 magnetized by the rated rectification or overcurrent applied to the heater 71 by the armature 83, but the short circuit current applied to the heater 71 The elastic force of the magnet 81 is adjusted so as to move toward the magnet 81 by the attraction force of the magnet 81 magnetized by the magnet 81.

When the armature 83 is attracted toward the magnet 81 by the magnetic force of the magnet 81 magnetized by the short circuit current applied to the heater 71, the upper end of the armature 83 comes in contact with the cross bar 41, 41 in the counterclockwise direction.

Although the supporter 82 is shown as being fixed by the rivets 85 on the magnet 81 in FIGS. 2A and 2B, it may be fixed to various engaging means such as bolts or welding, And may be fixed to the heater 71, the enclosure 10, as is known in the art depending on the example.

In the conventional circuit breaker constructed as described above, the overcurrent exceeding the rated current is supplied to the heater 71 (see Figs. 2A and 2B) or the bimetal 72 (see Fig. 2A) when the handle H is turned on and the circuit breaker is turned on 3a and 3b), the bimetal 72 is bent toward the crossbar 41 by the heat generated by the heater 71 or the bimetal 72 so that the rod 73 of the bimetal 72 is moved to the cross bar 41 so as to rotate the cross bar 41 in the counterclockwise direction.

At this time, when the deformation force of the bimetal 72 exceeds the trip load of the opening / closing mechanism 40, the opening / closing mechanism 40 moves the movable contact 30 to the trip position for separating the movable contact 30 from the fixed contact 20.

4A and 4B, when a short circuit current exceeding tens of times the rated current is applied in the state that the conventional wiring breaker is turned on, the heater 71 or the bimetal 72 (FIGS. 3A and 3B) The magnet 81 disposed adjacent to the heater 71 is heated by the short circuit current applied to the heater 71 before the bimetal 72 is bent toward the cross bar 41 by this heat generation The magnet 81 will instantaneously suck the armature 83 by overcoming the elastic force of the unshown spring (see "84" in Figs. 2B and 3B).

Thereafter, the upper end of the armature 83 strikes the crossbar 41 in the counterclockwise direction. When the amount of impact due to the impact of the armature 83 exceeds the trip load of the opening / closing mechanism 40, The opening / closing mechanism 40 moves the movable contact 30 to the trip position for separating the movable contact 30 from the fixed contact 20.

In the tripping process, the movable contactor 30 is separated from the stationary contactor 20, and the arc generated in the process of separating the movable contactor 30 from the stationary contactor 20 passes through the path of the movable contactor 30 And is extinguished by the SOHO apparatus 60 disposed on the apparatus.

The attracting force between the magnet 81 and the armature 83 due to the magnetic force of the magnet 81 in the trip device 50 of the conventional circuit breaker according to the present invention is determined by the square of the fault current applied to the magnet 81 It depends on size.

On the other hand, the operation current value of the circuit breaker for interrupting the fault current is determined by the manufacturer as a multiple of the rated current (for example, 10 times the rated current) in accordance with the characteristics of the circuit breaker.

Therefore, when a high rated current is applied as in the case of the circuit breaker of Figs. 1 to 2B, the operating current value (for example, ten times as high as the rated current) is large, so that the armature 83 is provided with the armature 83 The armature 83 strikes the cross bar 41 with a force strong enough to overcome the trip load of the opening and closing mechanism 40 so that the opening and closing mechanism 40 can be stably tripped have.

However, when a low rated current is applied to the circuit breaker of Figs. 1 to 3B, when the operating current value is adopted as a multiple of the same high rating (for example, 10 times lower rated current), the magnet 81 is susceptible to the trip load set in the opening / closing mechanism 40. [0064] As shown in FIG.

In other words, when a low rated current is applied to the circuit breaker of Figs. 1 to 3B and a large fault current exceeding the operating current value is generated in the circuit, the magnet 81 is supplied with Sufficient magnetic force is generated.

Accordingly, the armature 83 strikes the cross bar 41 with a force strong enough to overcome the trip load of the opening / closing mechanism 40, so that the opening / closing mechanism 40 can be stably tripped.

However, when a small fault current in the minimum operating current range is generated in the circuit, a magnetic force for attracting the armature 83 is generated in the magnet 81, but the armature 83, which is weak in magnetic force and attracted to the magnet 81, The cross bar 41 may not strike the cross bar 41 to such an extent that it sometimes fails to overcome the trip load of the opening and closing mechanism 40, leading to a trip failure of the opening and closing mechanism 40.

This causes so-called operation current scattering phenomenon in which the tripping of the opening / closing mechanism 40 occurs irregularly according to the magnitude of the fault current.

In order to solve such a problem, in a circuit breaker according to Korean Patent Registration No. 10-1015333, as shown in FIG. 5, a coil 83 'for generating a large magnetic force even in a fault current of low current and improving the breaking ability of the circuit breaker Type trip device.

However, the trip device of the circuit breaker of FIG. 5 has a complicated structure of its components, and therefore, there is a problem that the product space constraint, the productivity and the manufacturing cost are increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a trip device for a circuit breaker, which increases the attracting force of the trip device even under a low operating current to induce stable operation of the armature, .

In order to achieve the above object, according to the present invention, there is provided a plasma processing apparatus comprising: a magnet provided adjacent to a heater or a bimetal and formed of a ferromagnetic material so as to be magnetized by an accident current flowing in the heater or the bimetal; A supporter fixed to an outer case of the magnet, the heater, or the circuit breaker; An armature rotatably installed on the supporter, the armature rotating toward the magnet by the magnetic force of the magnet to move the opening / closing mechanism to the trip position; An elastic member provided between the supporter and the armature so as to elastically support the armature in a direction opposite to the magnet; And at least one auxiliary armature provided on the armature face opposite to the magnet.

Here, the attraction force between the magnet and the armature may be increased by increasing the number, size, or number and size of the auxiliary armature.

The lower portion of the armature may include a first body portion facing the magnet, first and second side portions formed on both sides of the first body portion and protruding toward the magnet side, And a flat second body part fixed to the inner surface of the body part.

The second body part may further include third and fourth side parts formed on both sides of the second body part so as to be fixed to the inner surfaces of the first and second side parts and protruded toward the magnet side.

And when the auxiliary armature is installed in the lower part of the armature, the auxiliary armature is configured not to protrude beyond the outer shape of the armature.

At least one first hole is formed in the first body portion of the lower portion of the armature, a second hole is formed in the second body portion of the auxiliary armature at a position corresponding to the first hole, A rivet connection, a bolt and nut connection, a screw connection, or a tap bolt connection may be made through the two holes to fix the auxiliary armature to the lower portion of the armature.

Further, the auxiliary armature may be constituted by a permanent magnet.

In the fault current trip function, which is a main function of the circuit breaker, the auxiliary armature is additionally fixed to the armature so as to increase the attracting force of the armature attracted to the magnet by the same magnitude of magnetic force, So that the blocking operation can be performed.

The present invention can also realize a function of simply adjusting the operating current value stepwise without changing the spring according to the lamination structure and quantity of the auxiliary armature.

Accordingly, in addition to the effect of improving the quality of the circuit breaker of the present invention, it is possible to simplify the trip device relatively in comparison with the trip device constituted by the coil system, thereby improving the productivity and reducing the cost.

1 is a front sectional view of a wiring breaker according to the prior art.
2A is a schematic view of a trip device of a circuit breaker according to the prior art.
FIG. 2B is an exploded perspective view of FIG. 2A.
Fig. 3A is a schematic view of a trip device of another wiring breaker according to the prior art.
FIG. 3B is an exploded perspective view of FIG. 3A.
FIGS. 4A and 4B are exemplary views illustrating an operation of disconnecting the electronic detection mechanism of the circuit breaker according to the related art.
5 is an exploded perspective view of a portion of a trip device having a coil operating mode of another wiring breaker according to the prior art.
6A is a perspective view of a trip device of a circuit breaker according to the present invention.
6B is a perspective view of the trip device of the circuit breaker with the supporter removed in Fig. 6A.
7A is a perspective view of an amateur assembly incorporating an auxiliary armature in accordance with the present invention.
FIG. 7B is an exploded perspective view of FIG. 7A. FIG.
Figure 7c is a perspective view of the auxiliary armature according to Figure 7a.
FIG. 7D is a longitudinal sectional view of FIG. 7A. FIG.
8 is a perspective view of an amateur assembly incorporating a planar auxiliary armature according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical ideas and the scope of the invention are limited.

The trip device 500 of the circuit breaker according to the present invention is a so-called thermo-electronic trip device 500, and particularly relates to the electronic detection mechanism 800, 700).

Accordingly, the thermal-electronic trip device 500 will be described generally in describing the present invention.

FIG. 6A is a perspective view of a trip device of a circuit breaker according to the present invention, and FIG. 6B is a perspective view of a trip device of a circuit breaker without a supporter in FIG. 6A.

First, referring to FIG. 6A, the thermal-dynamic detection mechanism 700 of the trip device 500 of the wiring breaker according to the present invention is electrically connected to a movable contact (see "30" in FIG. 1) A heater 710 connected to a load whose other end is not shown, and a bimetal 720 fixed to be in contact with the heater 710.

The bimetal 720 is indirectly heated (indirectly heated) by the heat of the heater 710 to which the overcurrent is applied so that the bimetal 720 is arranged so as to be curved toward the crossbar (see 41 in FIGS. 1, 4A and 4B) do.

In the circuit breaker according to the configuration of FIGS. 2A and 2B, a high rated current is generally applied to the heater 710, and a low rated current is applied to the heater 710. In the description of the present invention, Will be described as a case where it is applied.

When only a low rated current is applied to the wiring breaker, although the heater 710 is omitted in Figs. 6A and 6B, one end is electrically connected to the movable contact 30 and the other end is connected to the load The bimetal 720 is directly heated (directly heated) by an overcurrent applied to the bimetal 720 so that the cross bar (not shown) (not shown in FIG. 1, 4A and 4B, (See FIG.

6A and 6B, the electronic detection mechanism 800 of the trip device 500 of the circuit breaker according to the present invention includes: A magnet 810 formed adjacent to the heater 710 or the bimetal 720 and formed of a ferromagnetic material such as a steel material so as to be magnetized by an accident current such as a short circuit current flowing through the heater 710 or the bimetal 720, A supporter 820 fixed to the magnet 810 by a shown rivet (see "85" in FIGS. 2B and 3B), a rotatably installed in the groove 821 formed in the supporter 820, An armature 830 formed of a ferromagnetic material such as a steel material that rotates toward the magnet 810 side by the magnetic force of the armature 810 and moves the opening / closing mechanism (see "40" in FIG. 1) of the wiring breaker to the trip position, (See "84" in Figs. 2B and 3B) provided between the supporter 820 and the armature 830 so as to elastically support the magnet 830 in a direction opposite to the magnet 810 And an elastic member.

2B and 3B) is moved by the attraction force of the magnet 810 magnetized by the rated rectification or overcurrent applied to the heater 710 by the armature 830 The elastic force of the magnet 810 is adjusted so as to move toward the magnet 810 due to the attractive force of the magnet 810 magnetized by the short circuit current applied to the heater 710.

When the armature 831 is attracted toward the magnet 810 by the magnetic force of the magnet 810 magnetized by the short circuit current applied to the heater 710, (See "41 " in Figs. 1, 4A, and 4B) to rotate the cross bar counterclockwise.

Although the supporter 820 is illustrated as being fixed on the magnet 810 in FIG. 6A, it is contemplated that the heater 710, or an unshown enclosure (see FIG. 1 Quot; 10 "of FIG.

The configuration described above is the same as the configuration of the trip device 50 of the circuit breaker according to the prior art, and a description will be given below with respect to the portion related to the auxiliary armature 930 of the electronic detection mechanism 800 related to the feature of the present invention.

7A is a perspective view of an armature assembly in which an armature 830 according to the present invention is coupled to an armature 930. FIG. 7B is an exploded perspective view of FIG. 7A. FIG. 7C is a perspective view of an armature 930 according to FIG. And Fig. 7D is a longitudinal sectional view of Fig. 7A.

7A to 7D, the auxiliary armature 930 is fixed to the surface of the armature 830 facing the magnet 810 (see FIGS. 6A and 6B) And transmits the attraction force applied to the auxiliary armature 930 by the magnetic force of the armature 810 to the armature 830 as it is.

The auxiliary armature 930 is formed of a material such as an armature 830 that can be attracted toward the magnet 810 by the magnetic force of the magnet 810 and is formed of a steel material such as the armature 830.

Since the auxiliary armature 930 is installed on the surface of the armature 830 opposite to the magnet 810, the distance between the auxiliary armature 930 and the magnet 810 is set to be larger than the distance between the magnet 810 and the armature 830 Lt; RTI ID = 0.0 > distance < / RTI >

In addition to this, the area through which the magnetic flux of the magnet 810 passes by the auxiliary armature 930 is increased.

The magnetic flux of the magnet 81 passes through only the armature 83 in the trip device 50 of the circuit breaker according to the prior art. However, in the trip device 500 of the circuit breaker according to the present invention, When the present invention is applied to a circuit breaker for a wiring breaker, the area through which the magnetic flux of the magnet 810 passes increases by a portion corresponding to the auxiliary armature 930, .

On the other hand, it is generally known that the attracting force by magnetic force increases as the distance between the magnetic force generating source and the attracting object attracted by the magnetic force of the magnetic force generating source becomes closer and the magnetic flux passing area of the attracting object becomes larger.

Therefore, when the auxiliary armature 930 according to the present invention is applied to the circuit breaker, the auxiliary armature 930 according to the present invention increases the distance from the magnet 810 and increases the magnetic flux passing area, The attracting force applied to the armature 830 and the auxiliary armature 930 according to the present invention by the magnet 810 is substantially the same as that according to the conventional art, assuming that the same magnitude of magnetic force is generated by the magnet 810 by the current Compared to amateur (83).

Therefore, the armature 830 moved together with the auxiliary armature 930 toward the magnet 810 side due to the fault current has a cross (not shown) enough to overcome the trip load of the opening / closing mechanism (see "40 & (See " 41 "in Fig. 1 and Figs. 4A and 4B) is struck strongly so that the tripping of the unshown opening and closing mechanism (see Fig.

Accordingly, when the auxiliary armature 930 according to the present invention is applied to a circuit breaker for wiring, a so-called operation current scattering phenomenon occurs in which a tripping failure of an opening / closing mechanism (see "40" Is prevented.

On the other hand, the auxiliary armature 930 may increase the attraction force between the magnet 810 and the armature 830 by increasing the number, size, or number and size of the armature 830.

Although the auxiliary armature 930 may be made of a steel material sucked by the magnet 810 as described above, the auxiliary armature 930 itself may be made of a permanent magnet. In this case, a magnet The permanent magnet may be disposed at a polar position so that the permanent magnet is attracted by the magnetic force of the permanent magnet.

When the permanent magnets are installed as described above, the magnetic force of the permanent magnets is added to the magnetic force of the magnets 810, so that the attractive force between the magnets 810 and the armature 830 can be further increased.

Hereinafter, the configurations of the armature 830 and the auxiliary armature 930 will be described in more detail with reference to FIGS. 7A to 7D.

The upper portion of the armature 830 constitutes an arm 831 which contacts a not shown crossbar (see "41 " in Figures 1, 4A and 4B), and the middle portion constitutes an unshown spring (Figures 2B and 3B And a lower portion of the shaft 832 is connected to the first body portion 833 and the second body portion 832. The first body portion 833 and the second body portion 832 are opposed to the magnet 810, And first and second side portions 833 'and 833' 'formed on both sides of the first body portion 833 and protruding toward the magnet 810.

As shown in FIG. 8, the auxiliary armature 930 may be composed only of a flat second body 933 fixed to the inner surface of the first body 833 of the armature 830.

However, as shown in FIGS. 7A to 7D, the auxiliary armature 930 has a larger magnetic flux passage area through which the magnetic flux of the magnet 810 passes, so that the auxiliary armature 930 can be more sucked toward the magnet 810 side. (933) may further include third and fourth side portions (933 ', 933' ') protruding toward the magnet (810).

The third and fourth side portions 933 'and 933' 'are bent at both sides of the second body portion 933 so as to be closely fixed to the inner surfaces of the first and second side portions 833' and 833 '' .

7D, when the auxiliary armature 930 is installed at a lower portion of the armature 830, the auxiliary armature 930 protrudes beyond the outer shape of the armature 830 .

This is because the second body 933 and the third and fourth side parts 933 'and 933' 'of the auxiliary armature 930 are connected to the first body 833 and the first and second side parts 833 and 833 of the armature 830, ', 833' ').

If the auxiliary armature 930 is formed to be smaller than the armature 830, the operation stroke of the armature 830 of the wiring breaker according to the present invention can be kept the same as the conventional art.

6B shows a state in which the tip ends of the first and second side portions 833 'and 833' 'of the armature 830 are connected to the magnet 810 by the attracting force of the magnet 810 due to the fault current, As shown in Fig.

If the third and fourth side portions 933 'and 933' 'of the second body portion 933 of the auxiliary armature 930 are connected to the first and second side portions 833' and 833 'of the first body portion 833, The tip end portions of the third and fourth side surfaces 933 'and 933' 'of the second body portion 933 are first brought into contact with the magnet 810 so that the rotation range of the armature 830 (Stroke) becomes shorter and the time during which the armature 830 can be accelerated by the attracting force of the magnet 810 is also shortened so that the armature 830 and the auxiliary armature 930 can not be moved It is not possible to secure a sufficient amount of momentum to overcome the trip load of the "40"

Not only this but also the coupling between the auxiliary armature 930 and the armature 830 may be inaccurately determined so that one of the tip portions of the third and fourth side portions 933 'and 933' 'contacts the magnet 810 first The shaft 832 of the armature 830 supported by the groove 821 of the supporter 820 is rotated and the rotation of the armature 830 becomes unstable and consequently the operation reliability There arises a problem that it can not be secured.

Accordingly, in the present invention, the size of the auxiliary armature 930 is smaller than that of the armature 830 as described above.

Meanwhile, in coupling the auxiliary armature 930 to the armature 830, the auxiliary armature 930 may be coupled to the armature 830 through various methods such as welding, friction welding, and electric pressure welding.

According to an embodiment of the present invention, at least one first hole 833 '' 'is formed in the first body portion 833 under the armature 830, and the second body portion 833' The first and second holes 833 '' and 933 '' 'are formed in the first hole 933 at positions corresponding to the first holes 833' '' A method of fixing the auxiliary armature 930 to the armature 830 by a combination of a rivet 950, a bolt (not shown) and a nut (not shown), or a screw (not shown), and a tap bolt (not shown) .

When the circuit breaker (not shown) is turned on, an overcurrent exceeding the low rated current is applied to the heater 710 or the bimetal 720 The bimetal 720 is bent toward the crossbar side by the heat generated by the heater 710 or the bimetal 720 so that the bimetal 720 is moved to the cross bar (not shown in Figs. 1 and 2) Quot; 41 "in Figs. 4A and 4B) to rotate the cross bar counterclockwise.

At this time, when the deformation force of the bimetal 720 exceeds the trip load of the opening / closing mechanism (see "40" in FIG. 1) Position.

On the other hand, when a short circuit current exceeding tens of times of a low rated current is applied in the state that the conventional wiring breaker is turned on, the heater 710 or the bimetal 720 (see "72" in FIGS. 3A and 3B) However, the magnet 810 disposed adjacent to the heater 710 or the bimetal 720 before the bimetal 720 is bent toward the crossbar (see Figs. 1, 4A and 4B) The magnet 810 overcomes the elastic force of the unshown spring (see "84" in FIGS. 2B and 3B) and the armature 830 and the auxiliary armature 930 are magnetized by the short- It is instantaneously sucked.

Here, since the auxiliary armature 930 is fixed to the armature 830, the suction force applied to the auxiliary armature 930 is eventually transmitted to the armature 830.

Therefore, the attractive force applied to the armature 830 according to the present invention is greater than the attractive force applied to the armature 83 of the conventional circuit breaker.

In other words, when the auxiliary armature 930 is applied to the trip device 500 of the circuit breaker, particularly, the electronic detection mechanism 800 according to the present invention, even if the magnet 810 is magnetized by the fault current of low current, The armature 830 strongly hits the crossbar (see Fig. 1, Fig. 4A and Fig. 4B, see Fig. 41) not shown so far as to sufficiently overcome the trip load of the opening / closing mechanism, (See "40" in Fig. 1) can be stably performed.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is self-evident to fall within the scope of the claims.

500: Trip device 700: Thermal kinematics detection device
710: Heater 720: Bimetal
800: Electronic detection mechanism part 810: Magnet
820: Supporter 821: Home
830: Amateur 831: Arm
832: Axis 833: First body part
833 ', 833'': first and second side portions 833''': first holes
930: auxiliary amateur 933: second body part
933 ', 933'': third and fourth side portions 933''': second hole
950: Rivet

Claims (7)

A magnet formed adjacent to the heater or the bimetal and formed of a ferromagnetic material so as to be magnetized by the fault current flowing in the heater or the bimetal;
A supporter fixed to an outer case of the magnet, the heater, or the circuit breaker;
An armature rotatably installed on the supporter, the armature rotating toward the magnet by the magnetic force of the magnet to move the opening / closing mechanism to the trip position;
An elastic member provided between the supporter and the armature so as to elastically support the armature in a direction opposite to the magnet;
And at least one auxiliary armature provided on the armature face opposite to the magnet. The method according to claim 1,
Wherein the attraction force between the magnet and the armature is increased by increasing the number, size, or number and size of the auxiliary armature. The method according to claim 1,
The lower portion of the armature includes a first body portion facing the magnet,
And first and second side portions formed on both sides of the first body portion and protruding toward the magnet side,
Wherein the auxiliary armature includes a flat second body portion fixed to the inner surface of the first body portion of the armature. The method of claim 3,
Wherein the second body part further includes third and fourth side parts formed on both sides of the second body part so as to be fixed to the inner surfaces of the first and second side parts and protruded toward the magnet side. . 5. The method of claim 4,
Wherein when the auxiliary armature is installed in a lower portion of the armature, the auxiliary armature does not protrude outside the outer shape of the armature. 6. The method according to any one of claims 3 to 5,
At least one first hole is formed in the first body portion of the lower portion of the armature,
A second hole is formed in the second body portion at a position corresponding to the first hole,
Wherein the auxiliary armature is fixed to the lower portion of the armature by a rivet connection, a bolt and a nut connection, a screw connection, or a tap bolt connection through the first and second holes. The method according to claim 1,
Wherein the auxiliary armature is a permanent magnet.

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