KR101346707B1 - Apparatus for leakage current circuit breaker - Google Patents

Abstract

To improve the economics of production and the reliability of product by simplifying a power cut-off structure, the present invention includes: a body having an input connection unit connected to a power supply side and an output connection unit connected to a load side; a switch handle rotatably combined with a support frame which is prepared in the center of the body, a link member is engaged in a lower end thereof and selectively moving the link member up and down by being rotated; a cross bar which is selectively downwardly pressurized by the link member; an elastic switch bar arranged in between the input connection unit and output connection unit and providing the elastic resilience by being gradiently formed to selectively conduct the input connection unit and output connection unit; a bimetal support of which one end is connected to the gradient part of the elastic switch bar and prepared to be backwardly bent due to thermal resistance in case of inflow of excess current; a trip unit arranged to move forward and backward by being come in contact with an upper end rear side of the bimetal support and having an inclined surface in the lower part; and a latch unit prepared to be surface-contacted and bound to the inclined surface since one side of the latch unit is hinge-connected to the link member and is downwardly pressurized.

Description

Earth leakage breaker {apparatus for leakage current circuit breaker}

The present invention relates to a ground fault interruption device for automatically shutting off the power supply by sensing an overcurrent caused by a ground fault. will be.

In general, an earth leakage circuit breaker is a device connected to the load side due to the overload and short circuit occurring in the line by quickly switching the switching operation of the electric line by manual or automatic operation in order to prevent damage due to overload or short circuit in the electrical circuit and It is a safety device to prevent the damage of the track.

Here, the bimetal type earth leakage circuit breaker commonly used as an earth leakage circuit breaker uses a bimetal having a property of bending the thermal expansion rate in a small direction when heat is applied by attaching two metals having different thermal expansion coefficients. When the resistance is generated and the bimetal is heated, and excessive current flows over a certain standard, the bimetal is bent to drive the adjacent tripping trip part, so that the contact terminal coupled to the lower part of the bimetal is separated from the input terminal to block the flow of current. Is made of.

1 is a side view showing a conventional ground fault interrupting device.

As shown in FIG. 1, the conventional earth leakage breaker 100 includes an input connection part 112, an output connection part 114, a body 110, a trip part 147, a bimetal support 113, and a switch handle 121. , A support frame 123, a crossbar 134, an elastic switch bar 111, and a latch unit 135.

Here, in the conventional ground fault interrupting device 100, when an excessive current flows due to a ground fault, the bimetal support 113 is bent to drive the trip unit 147 according to a current resistance string, and the trip unit 147 is driven. As a result, the restraint of the latch unit 135 is released to drive the switch handle 121 to be turned off and the power is cut off.

However, the elastic switch bar 111 used in the conventional ground fault interrupting device 100 is connected to the input connection part 112 in a pressurized state by the crossbar 134 to maintain an energized state. In this case, the central portion of the elastic switch bar 111 is easily deformed, and there is a problem in that power efficiency is reduced due to poor contact with the input connection unit 112.

In addition, when increasing the plate thickness of the elastic switch bar 111 to press the bent portion of the bimetal support 113 at the junction with the bimetal support 113, by accelerating the driving of the trip unit 147 Due to the current flows below the safe value, the power is easily cut off, there is a problem in reducing the ease of use.

On the other hand, in order to prevent the deformation without increasing the plate thickness of the elastic switch bar 111, when the elastic switch bar 111 is formed by overlapping a plurality of plates having a thin thickness, the elastic switch bar ( 111) due to the complexity of the production process there was a problem that the production cost increases and productivity is reduced.

In addition, by generating a missing portion in the coupling portion of the plate formed of the plurality of layers to act as an element to hinder the movement of electrons, by increasing the current resistance between each layer of the elastic switch bar 111 to the electrical leakage There was a problem in reducing the power efficiency of the breaker 100.

On the other hand, since the end surface of the latch portion 135 disposed in contact with the trip portion 147 to maintain the pressure fixed state in the energized state easily damages the trip portion 147, the switch handle 121 The fixing force of the power supply is reduced, and there is a problem in that the reliability of the product is reduced because the power supply of the load side is cut off even though the current leakage state is not an excessive current flow.

Korean Registration Room No. 20-0341427

In order to solve the above problems, the present invention is to provide a ground fault interrupting device to simplify the power interruption structure to improve the economics of production and reliability of the product.

In order to solve the above problems, the present invention includes a body having an input connection portion connected to the power supply side and an output connection portion connected to the load side; A switch handle coupled to the support frame provided at the center of the body, the link member being coupled to a lower end thereof, and selectively moving the link member up and down as the link member is rotated; A crossbar selectively pressed downward by the link member; An elastic switch bar disposed between the input connection part and the output connection part, the central part being formed to be gradient to selectively energize the input connection part and the output connection part by being pressed by the crossbar to provide resilience; A bimetal support having one end connected to the gradient part of the elastic switch bar and provided to be bent in a direction in which the current is retracted by the current resistance heat when an excessive current is introduced; A trip part disposed in contact with a rear side of the upper end of the bimetal support and moving forward and backward, the inclined surface being formed at a lower portion of the trip part; And one side is hinged to the link member is provided with a leakage circuit breaker including a latch which is provided to be constrained by the bottom surface of the one end is in contact with the inclined surface as it is pressed downward.

Here, it is preferable that the latch portion is bent so that the one end is inclined, so that the bottom surface of the one end is parallel to the inclined surface.

In addition, the latch unit is preferably provided with a seesaw movement relative to the hinge connection point when the rear side of the trip unit moves so that the other end is rotated upward to release the pressure of the crossbar.

In addition, the elastic switch bar is a single plate made of a metallic material having elasticity, one end is fixedly connected to any one of the input connection portion and the output connection portion, the other end is preferably provided to be selectively connected to the other side spaced apart.

On the other hand, the other end of the elastic switch bar is preferably formed with a plunger contact is provided with a coupling portion formed of a ferromagnetic material to selectively contact with the input connecting portion.

Through the above solution, the earth leakage breaker of the present invention provides the following effects.

First, when the latch portion is pressed downward, the bottom surface of one end bent obliquely to the latch portion is in surface contact with the inclined surface of the trip portion, thereby increasing the contact area between each other, and the trip portion is supported by the downward pressing force of the latch portion on the inclined surface. Does not retreat sensitively Thus, even though the bimetal support is slightly heated, the trip part may be prevented from being sensitively separated from the latch by the force caused by the bending of the bimetal support, thereby improving reliability and ease of use of the product.

Second, in the related art, a plurality of layers of the elastic switch bar connected to the bimetal support and the bimetallic support are coupled in line contact with each other to minimize the elastic restoring force, but the downward pressing force of the latch portion is applied to the inclined surface. Since the trip part is distributed and not retracted sensitively, even if the elastic switch bar is formed as a single member having an increased thickness, malfunction of the bimetal support can be prevented, thereby reducing the number of parts of the elastic switch bar and manufacturing process. By simplifying this, productivity and economics can be significantly improved.

Third, because one end portion and the other end portion of the elastic switch bar are bent in opposite directions to each other, the elastic restoring force is improved, thereby preventing deformation due to pressurization of the cross bar, thereby improving durability and mutually blocking current and energized state. Accurate drive of the conversion can improve product reliability.

Fourth, since the productivity of the product and the reliability of the operation can be remarkably improved by simply changing the structure of the latch unit and the elastic switch bar in the conventional ground fault interrupting device, the design deformation is minimized and compatible with the conventional production line and the assembly line. Can be efficiently applied to existing industries.

1 is a side view showing a conventional ground fault interrupting device.
2 is a perspective view of a ground fault interrupting device according to an embodiment of the present invention;
Figure 3 is a side view of a ground fault interrupting device according to an embodiment of the present invention.
Figure 4 is a side cross-sectional view of a ground fault interrupting device according to an embodiment of the present invention.
5a, 5b and 5c is an enlarged operation of the earth leakage breaker according to an embodiment of the present invention.

Hereinafter, a circuit breaker according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

Here, the earth leakage breaker is a demonstration trip operation to cut off the power by driving the trip unit by the bending of the bimetal support due to the resistance heat when the excessive current of less than a certain intensity continuously in a predetermined time or more according to the characteristics of the excess current When a large amount of excess current of a certain intensity or more is instantaneously introduced in a predetermined time or less, the trip bar is attracted by magnetization of a coil to drive the trip unit to provide an instantaneous trip operation to cut off power.

Figure 2 is a perspective view of a ground fault interrupting device according to an embodiment of the present invention, Figure 3 is a side view of the ground fault interrupting device according to an embodiment of the present invention.

2 to 3, the earth leakage breaker 200 according to the present invention includes a body 210, a cover part (not shown), an input terminal part 220, an output terminal part 270, and an input connection part ( 230, output connection 260, support frame 310, link member 340, switch handle 290, crossbar 330, elastic switch bar 240, bimetal support 250, tripping part 300 , A latch unit 320, and a trip circuit unit 280.

Here, the ground fault interrupting device 200 is connected to both sides of the power supply side and the load side to be selectively energized, and the input terminal portion 220 is formed on the power supply side to receive current from the outside, and to the load side. The output terminal portion 270 is formed to supply a current.

In this case, the input terminal unit 220 is coupled to the input connection unit 230, the input connection unit 230 is provided with the elastic switch bar 240 to selectively energize according to the rotation of the switch handle 290. do. One end of the elastic switch bar 240 is fixed to the output connection part 260. In addition, the trip unit 300 and the trip circuit unit 280 are configured to block the current when an excessive current is supplied.

On the other hand, the body 210 is provided with an input connecting portion 230 connected to the power side and an output connecting portion 260 connected to the load side. Here, the wire groove 213 is formed in the front and rear of the body 210. At this time, a wire connected to the power supply side is inserted into the wire groove 213 formed at the front, and is bound to the work terminal unit 220, a wire connected to the load side is inserted into the wire groove 213 formed at the rear, It is bound to the output terminal unit 270. In addition, the work terminal unit 220 and the output terminal unit 270 is provided with a fixing screw 221, it can be fixed by rotationally pressing the inserted wire.

In addition, the body 210 is formed of a synthetic resin material having insulation and non-combustibility. At this time, it is preferable to be formed in a square plate having an area and thickness of a predetermined standard so as to be arranged and fixed in the switchboard or distribution box. In addition, screw grooves 211 are formed at both sides of the body 210 so as to communicate with the cover part and to be fixedly fastened by screws to the switchboard or distribution box.

In addition, the body 210 is provided with an internal accessory of the ground fault interrupting device 200 to cut off or energize the cover, and cover the upper side of the body 210 to protect the internal accessory. Not shown). Of course, the body 210, the cover coupling portion 212 is formed, it is preferable that the coupling means capable of coupling with the cover portion (not shown) is provided.

In this case, the cover portion (not shown) is formed with a plurality of through grooves. In addition, the switch handle 290 or a screw used for fixing may be exposed through the through groove to be manipulated or rotated from the outside. Of course, the cover portion is formed of a synthetic resin having an insulating and non-flammable, it is formed to have a space in which the internal accessories can be placed.

On the other hand, the input connection unit 230 is formed to be connected to the power terminal unit 220 and energized. In this case, the input connection unit 230 is preferably formed of a material with high electrical conductivity to improve power efficiency.

In addition, the input connection unit 230 is provided so that one side is fixed to the inside of the work terminal unit 220 is directly connected to a wire for supplying current from the outside. Here, the other side of the input connecting portion 230 is in contact with the elastic switch bar 240 selectively. On the other side of the input connector 230, a circular protrusion 231 is formed to stabilize contact with the elastic switch bar 240 and increase a contact area to improve electrical conductivity.

On the other hand, the output connecting portion 260 is provided to connect one end of the elastic switch bar 240 and one end of the bimetal support 250 to be fixed to the body 210. In this case, since the elastic switch bar 240 and the bimetallic support member 250 are difficult to be integrally molded, the elastic switch bar 240 and the bimetallic support member 250 may be molded and connected to the output connection part 260. In addition, since the one end of the bimetal support 250 is fixed by the output connecting portion 260, the upper end of the bimetal support 250 is bent in a metal direction having a low coefficient of thermal expansion when the temperature rises due to the current resistance heat. .

On the other hand, the switch handle 290 is coupled to be rotated to the support frame 310 provided in the center of the body 210, the link member 340 is coupled to the lower end, as the link member (rotated) 340 is selectively moved up and down.

Here, the switch handle 290 is formed of an insulating material. In addition, the handle portion 291 is exposed to the outside of the cover portion (not shown) is provided to be manipulated by the user. Accordingly, the user can safely control the operation of energizing and blocking the current by manipulating the switch handle 290.

In addition, since the support frame 310 is buried in the center of the body 210 and fixed, the switch handle 290 may be coupled and rotated. At this time, the hinge connecting portion formed on the lower side of the switch handle 290 and the handle support shaft 311a formed on the upper side of the support frame are coupled by the shaft member 311. In addition, an elastic member 312 is provided between the handle hinge shaft and the handle support shaft 311a to elastically support the support frame 310 and the switch handle 290. As a result, the switch handle 290 transmits a force to the link member 340 when driven in the energized state by the rotation, but can be quickly returned to its original position in the current blocking state.

In addition, the link member 340 is coupled to the hinge groove 314 of the protrusion formed on one side of the switch handle 290, is moved up and down in the rotation of the switch handle 290, the latch unit ( 320 is provided to pressurize.

Meanwhile, the crossbar 330 is selectively pressed downward by the link member 340. Here, the crossbar 330 is disposed in front of the support frame 310 is moved downward when pressed, and moved upward when the pressure is released.

In detail, the left and right protrusions of the crossbar 330 are elastically supported by the elastic switch bar 240, and the lower end is elastically supported by the spring and moved by the link member 340. It moves downward when pressurized through, and is provided to return to the upper side when depressurizing.

On the other hand, the elastic switch bar 240 is disposed between the input connecting portion 230 and the output connecting portion 260, the input connecting portion 230 and the output connecting portion 260 as it is pressed by the cross bar 330 The central portion is formed to be gradient to selectively energize the) to provide resilience.

In addition, the elastic switch bar 240 is a single plate made of a metallic material having elasticity, one end of which is fixedly connected to any one of the input connecting portion 230 and the output connecting portion 260, and the other end of the elastic switch bar 240 is spaced apart from the other side. It is provided to be connected with.

2, one end of the elastic switch bar 240 is fixed to the output connection part 260, and the other end thereof is spaced apart from the input connection part 230 to be selectively connected. Of course, when the direction of the energized state and the disconnected state by the switch handle 290 is switched, one end of the elastic switch bar 240 is fixed to the input connecting portion 230, the other end to the output connecting portion 260 It may be provided to be selectively spaced apart.

In addition, the elastic switch bar 240 is formed of a single plate of a metallic material having elasticity. In this case, the electrical conductivity may be improved by forming a single plate. And, it has a predetermined thickness so as not to be easily deformed by the pressure by the crossbar 330, one end and the other end is formed to be bent in the opposite direction to each other.

In detail, the elastic switch bar 240 is one end and the other end is bent in the opposite direction to each other and the central portion is to be gradient can be improved resilience. One end portion is connected to the output connecting portion 260 together with the bimetal support 250, and the other end portion thereof is spaced apart from the input connecting portion 230, and the input connecting portion 230 is pressed when the crossbar 330 is pressed. ), And when the pressure is released is provided to block the current spaced apart by the rebound force.

That is, the elastic switch bar 240 is pressed to be bent in the opposite direction to one end and the other end in the energized state connected to the input connecting portion 230. Accordingly, when the one end is connected to the output connecting portion 260 together with the bimetallic support 250, one end of the gradient of the bimetallic support 250 is disposed in parallel and coupled. Therefore, the elastic switch bar 240 balances the force with the bimetal support 250 and does not affect the bending of the bimetal support 250.

And, the other end of the elastic switch bar 240 may be formed with a plunger contact 241 is provided with a coupling portion 241a formed of a ferromagnetic material to selectively contact the input connecting portion.

In detail, the other end portion which is bent and spaced apart from the input connecting portion 230 is connected to the input connecting portion 230 by the pressure of the crossbar 330, and the protrusion 321 and the protrusion of the input connecting portion 230 are separated. The contact 241 may be provided to contact. In this case, the coupling part 241a formed to surround the circumferential contact 241 is formed of a ferromagnetic material, and a magnetic material 231a having magnetic force is provided around the protrusion 231 of the input connection part 230. Adhesion can be improved upon contact. As a result, the connection force between the elastic switch bar 240 and the input connection unit 230 may be increased, thereby improving power efficiency.

As such, the elastic switch bar 240 is formed of a single plate of increased thickness compared to the prior art, one end and the other end is bent in the opposite direction to each other, when the energized state of the crossbar 330 is easily maintained Since the contact with the input connector 230 is stabilized without deformation, reliability and durability of the product may be improved.

In addition, in the related art, the latch unit 320 and the trip unit 300 are provided with a plurality of thin layers of the elastic switch bar 240 which is connected in line contact with the bimetal support 250 to form a balance of force. Elastic resilience should be minimized.

However, since the downward pressing force of the latch part 320 is distributedly supported on the inclined surface 302 so that the trip part 300 is not sensitively retracted, the elastic switch bar 240 is formed as a single member having an increased thickness. Even if it is formed, it is possible to prevent the malfunction of the bimetal support 250, to reduce the number of parts of the elastic switch bar 240 and simplify the manufacturing process can be significantly improved productivity and economic efficiency.

In addition, since a plurality of plates are not stacked as in the conventional elastic switch bar 111, but are formed as a single plate, current resistance is reduced, thereby improving power efficiency of the product. Furthermore, instead of combining the plurality of plates in different deformed states to impart elasticity, the ends of the plates may be bent in different directions to simplify the production process, thereby improving productivity.

On the other hand, one end of the bimetal support 250 is provided to be connected to the gradient portion of the elastic switch bar 240, it is provided to be bent in the direction to retreat to the current resistance heat when inflow of excess current.

Here, the bimetal support 250 is formed by combining two kinds of metals having different thermal expansion rates. In addition, one end of the gradient of the bimetal support 250 is connected to be energized with one end of the elastic switch bar 240 is coupled to the output connection 260.

That is, when an excessive current is applied to the bimetallic support 250, the bimetallic support 250 is bent toward a lower thermal expansion rate due to the current resistance heat. At this time, since one end of the bimetal support 250 is fixed to the output connecting portion 260, the rear side of the upper end of the bimetal support 250 is in contact with the bolt portion 301 of the trip 300, the trip part ( 300) is retreated.

In addition, since one end of the elastic switch bar 240 is bent and coupled to one end of the gradient of the bimetal support 250, it does not affect the bending of the bimetal support 250.

Therefore, the distance between the bolt part 301 of the trip part 300 and the rear side of the upper end of the bimetal support 250 can be calculated simply by the rate of heat change of the bimetal support 250, thereby assembling the product. Product productivity may be improved due to this ease, and the demonstration trip operation of blocking current by rotating the trip unit 300 to the bimetallic support 250 may be constantly driven, thereby improving reliability of the product.

On the other hand, the trip part 300 is disposed to be moved back and forth in contact with the rear end of the upper end of the bimetal support 250, the inclined surface 302 is formed at the bottom. Here, the trip part 300 is arranged so that the lower end is hinged to the body 210 to move forward and backward, and the hinge connection portion is provided with a spring to give an elastic force.

Accordingly, the trip unit 300 is switched to a state in which the current is cut off from one end of the latch unit 320 while the current is maintained while supporting the one end of the latch unit 320 to maintain current. It can be switched from the blocking state to the state that maintains the energization.

On the other hand, the latch portion 320 is provided so that one side is hinged to the link member 340 is pressed to the lower side, the bottom surface of one end is in surface contact with the inclined surface 302 to be constrained. At this time, the latch portion 320 is bent inclined such that the one end is parallel to the inclined surface (302).

In detail, one side of the latch unit 320 is hingedly connected to the link member 340 that moves up and down according to the rotation of the switch handle 290, the latch unit in accordance with the lower movement of the link member 340 320 is pressed downward.

In this case, the bottom surface of one end of the latch unit 320 is in surface contact with the inclined surface 302 of the trip unit 300, and the bottom surface of the other end of the latch unit 320 is disposed to press the crossbar 330. . In addition, the crossbar 300 is driven to press the elastic switch bar 240 according to the pressure to be connected to the input connection 230.

In addition, since the lower surface of one end of the latch unit 320 is supported in surface contact with the inclined surface 302 of the trip unit 300, the fixed pressure can be maintained by offsetting the pressure received upward by the crossbar 300. have.

As such, the bottom surface of one end of the latch unit 320 that maintains the pressure fixed state in the energized state is in surface contact with the inclined surface 302 of the trip unit 300 in parallel. As a result, the contact area between the lower surface of the one end bent obliquely of the latch unit 320 and the inclined surface 302 of the trip unit 300 increases when the latch unit 320 is pressed downward, thereby increasing the latch unit 320. As the downward pressing force of) is distributed and supported on the inclined surface 302, the trip part 300 is not sensitively retracted.

Therefore, even though the bimetallic support 250 is slightly heated, the trip part 300 is sensitively prevented from being separated from the latch portion 320 by the force caused by the bending of the bimetallic support 250. Reliability and ease of use can be improved. In addition, the force applied to the inclined surface 302 of the trip unit 300 can be distributed to the surface to prevent damage to improve the durability of the product.

When the excessive current flows in, the trip unit 300 moves to the rear side, and the latch unit 320 is seesawed based on the hinge connection point, and the other end is rotated upward to press the crossbar 300. It is provided to release.

In detail, when an excessive current flows in, the trip part 300 is moved to the rear side by the bimetal support 250, and the bottom end of the latch part 320 is not supported. Due to the elastic restoring force of 300, the seesaw is rotated based on the hinge connection point and rotates upward. Accordingly, the elastic switch bar 240 pressurized by the crossbar 300 is spaced apart from the input connection unit 230 to cut off the current.

The trip circuit unit 280 includes a trip bar 284, a coil 282, a test circuit unit 281, and an image current transformer 283. Here, the image current transformer 283 detects a leakage current at the load side and induces a magnetic force of the coil 282. At this time, the trip bar 284 is disposed in the center of the coil 282 to be sucked in accordance with the magnetization of the coil 282 is provided to retreat when a magnetic force occurs.

Thus, the trip unit 300 is separated from the latch unit 320 to cut off the current, thereby providing an instantaneous trip operation to cut off power when a large amount of excessive current flows in an instant.

In addition, the test circuit unit 281 is mounted on the trip circuit unit 280 together. In this case, when the test button exposed to the outside of the cover part is pressed, a connection with the virtual leakage unit 281a is generated to provide an excessive current inflow situation to provide an instantaneous trip operation of the trip circuit unit 280.

Hereinafter, the above-described ground fault interrupting device 200 will be described in more detail with respect to the driving of the state changed from the energized state to the blocked state through the trip unit 300.

Figure 4 is a side cross-sectional view of the earth leakage breaker according to an embodiment of the present invention, Figures 5a, 5b and 5c is an enlarged operation of the earth leakage breaker according to an embodiment of the present invention. Here, the enlarged operation degree is enlarged by the latch unit, the crossbar and the trip unit in order to show the structure and operation of the elastic switch bar in the earth leakage breaker in order to lock the state, the energized state, the latch unit deviation state It is shown.

As shown in FIG. 4, the ground fault interrupting device 200 selectively selects the crossbar 330 and the crossbar 330 for controlling the connection and the short circuit of the input connection unit 230 and the elastic switch bar 240. The latch unit 320 is provided to pressurize.

In addition, the ground fault interrupting device 200 supports the switch handle 290 and the latch unit 320 connected to the link member 340 for rotating the latch unit 320 to maintain a lower pressure fixed state. The trip part 300 includes the bimetal support 250 and the trip circuit part 280 which rotate the trip part 300 to release the press-fixed state of the latch part 320.

Here, referring to FIGS. 5A and 5B, the switch handle 290 exposed to the outside of the cover part (not shown) is manipulated to switch the ground fault interrupting device 200 to the energized state. At this time, the rotation of the switch handle 290 by the operation is to move the connected link member 340 downward to press the latch unit 320.

In detail, the link member 340 is hinged to one side of the latch unit 320, is guided to the guide groove 313 formed on the side of the support frame 310 to press the latch unit 320 downward Done. Here, one end of the latch unit 320 slides forward of the trip unit 300, and the other end of the latch unit 320 is in contact with the crossbar 330.

At this time, one end of the latch part 320 is hinged to the link member 340 but is pressed downward, so that one end of the latch part 320 is supported on the inclined surface 302 of the trip part 300. Until the other end does not fall to the elastic support of the crossbar 330.

When the bottom surface of one end of the latch unit 320 is brought into surface contact with the inclined surface 302, the other end pressurizes the crossbar 330 by the force of a lever, and the crossbar 330 according to the pressurization. Is lowered to press the elastic switch bar 240. Accordingly, the elastic switch bar 240 is driven to be electrically connected to the input connecting portion 230.

Meanwhile, referring to FIG. 5C, when an excessive current flows into the ground fault interrupting device 200, the excess current introduced into the input connection unit 230 passes through the elastic switch bar 240 to the bimetal support 250. It is transmitted, and generates heat of resistance in the bimetallic support (250).

In this case, since the bimetallic support 250 is formed of two metals having different thermal expansion rates, the bimetal support 250 is moved in the direction of the metal having low thermal expansion rate, that is, the rear side of the body 210 according to the resistance heat. Here, one end of the gradient of the bimetallic support 250 is fixed to the output connecting portion 260 so that the upper end of the bimetallic support 250 moves to the rear side.

In addition, the bimetal support 250 contacts the bolt part 301 of the trip part 300 and moves the trip part 300 backward. Accordingly, one end of the latch unit 320 is separated from the inclined surface 302 of the trip unit 300 to lose the supporting force.

Therefore, the balance between the lower surface of the other end pressing the crossbar 330 based on the hinge connection point of the latch unit 320 and the lower surface of one end supported by the inclined surface 302 is broken. Then, the seesaw movement of the one end is lowered and the other end is rotated upward based on the hinge connection point of the latch unit 320 to release the pressure state of the crossbar 330. Accordingly, the elastic switch bar 240 pressurized by the crossbar 300 is spaced apart from the input connection unit 230 to cut off the current.

Of course, the blocking driving of the ground fault interrupting device 200 may be driven by the trip circuit unit 280. Here, the image current transformer 283 provided in the trip circuit unit 280 detects a leakage current at the load side and induces a magnetic force of the coil 282. At this time, the trip bar 281 is sucked and retracted according to the magnetization of the coil 282. As the retraction is performed, the retraction is pulled back by pulling the trip part 300 connected to the trip bar 281 so as to be separated from the latch part 320 to cut off the current. As a result, an instantaneous trip operation may be provided in which power is cut off when a large amount of excessive current flows in an instant.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100,200: earth leakage breaker 110,210: body
211: screw groove 212: cover coupling portion
213: wire groove 220: input terminal portion
221: fixing screw 112,230: input connection
231: projection 231a: magnetic material
111,240: elastic switch bar 241: protrusion contact portion
241a: coupling portion 113,250: bimetal support
114,260: output connection 270: output terminal
271: wire 280: trip circuit part
281: test circuit unit 281a: virtual leakage unit
282: coil 284: current transformer
121,290: switch handle 291: handle
147,300: trip part 301: bolt part
302: slope 123,310: support frame
311: shaft member 311a: handle support shaft
312: elastic member 314: hinge groove
135,320: latch portion 134,330: crossbar
340: link member

Claims (5)

A body having an input connection part connected to a power supply side and an output connection part connected to a load side;
A switch handle coupled to the support frame provided at the center of the body, the link member being coupled to a lower end thereof, and selectively moving the link member up and down as the link member is rotated;
A crossbar selectively pressed downward by the link member;
An elastic switch bar disposed between the input connection part and the output connection part, the central part being formed to be gradient to selectively energize the input connection part and the output connection part by being pressed by the crossbar to provide resilience;
A bimetal support having one end connected to the gradient part of the elastic switch bar and provided to be bent in a direction in which the current is retracted by the current resistance heat when an excessive current is introduced;
A trip part disposed in contact with a rear side of the upper end of the bimetal support and moving forward and backward, the inclined surface being formed at a lower portion of the trip part; And
And a latch portion having one side hinged to the link member and being pressed downward, the latch portion being provided to be constrained by surface contact with the inclined surface. The method of claim 1,
And the latch portion is bent at one end to be inclined, and the ground leakage blocking device is formed so that the bottom surface of the one end is parallel to the inclined surface. The method of claim 1,
And the latch portion is moved by the seesaw movement relative to the hinge connection point when the rear portion of the trip portion moves so that the other end is rotated upward to release the pressurized state of the crossbar. The method of claim 1,
The elastic switch bar is a single plate made of a metallic material having elasticity, wherein one end is fixedly connected to one side of the input connection part and the output connection part, and the other end is provided to be selectively connected to be spaced apart from the other side. . 5. The method of claim 4,
The other end of the elastic switch bar earth leakage circuit breaker, characterized in that the protrusion is provided with a coupling portion formed of a ferromagnetic material to selectively contact with the input connection.

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