KR101498253B1 - Compact type home circuit breacket elcb and mccb - Google Patents

Abstract

The present invention discloses a small leakage and circuit breaker having an instantaneous trip device with a large breaking capacity. The circuit breaker comprises a pair of stators each connected to the input terminals, a pair of mobiles that can be selectively electrically connected to each stator, a first shunt twisted wire connected to each mover, A pair of bimetals capable of being bent, a base having a pair of load terminals electrically connected to each bimetal by a second shunt twisted wire; A handle rotatably provided on the base so as to connect a mover of a pair of mover to the pair of stator, and a handle capable of contacting each of the bimetals so as to be able to trip by separating a pair of mover from the pair of stator An opening and closing mechanism having a trip bar spaced apart from the bimetal of the pair; A pair of fixed cores disposed on the base so as to surround the periphery of each bimetal and capable of forming a magnetic body by a magnetic field formed on each bimetal when a short circuit current larger than an overcurrent is energized; And a bimetal to contact the trip bar by the resultant of the magnetic field of the fixed core derived from the bimetal and the bimetal before the bimetal contacts the trip bar so that the trip bar can be moved in the trip direction, And a pair of instantaneous trip plates rotatably positioned between the trip bars.
Further, the present invention provides an earth leakage breaker having a circuit for shutting off the overvoltage when an overvoltage exceeding the rated voltage is input.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small leakage and wiring breaker, and more particularly, to a small leakage and wiring breaker which is capable of protecting a circuit from an overvoltage applied from an input terminal.

Generally, the small breaker operates the handle opening / closing mechanism of the breaker by the bimetal curvature characteristic by the current directly applied to the bimetal to cut off the overcurrent.

If the overcurrent is more than 120% or more than 200% of the rated current in a typical small circuit breaker, the temperature of the bimetal gradually increases due to the overcurrent, and the bimetal is bent to the characteristic limit, . Then, the trip lever of the handle opening / closing mechanism is separated from the trip bar, the trip lever is moved by the spring, and the mover that has been in contact with the stator is released from the stator and is driven to the trip position (off position) to securely protect the load side from the overcurrent .

However, when a short-circuit current of several tens of times greater than the rated current flows in the bimetal, the bimetallic curvature characteristic is out of the allowable range of currents and the bimetallic loses its properties because the heat due to the current is directly concentrated in the bimetal As the bimetal is broken or disabled, the trip bar of the handle opening and closing mechanism can not be operated as desired. In this case, the miniature circuit breakers add an instantaneous trip device to the bimetal so that the overcurrent can be cut off within a few milliseconds from when the overcurrent occurs. That is, the instant trip device safely trips the handle opening / closing mechanism from the situation on the load side deviating from the bending characteristic of the bimetal.

Such small breakers according to the prior art are disclosed in Registration Practical Utility Modules 20-0268190, 10-2002-0010733, and 10-1071920.

1 is a view schematically showing the construction of a small earth leakage breaker according to the prior art.

1, the miniature earth leakage breaker 10 according to the prior art includes a pair of fixed terminals 6 connected to a pair of power terminals 2 and a pair of load terminals 4, A pair of bimetals 16 connected to the respective movable terminals 8 and curved when an overcurrent or a short circuit is generated on the load side, And a trip bar 18 movable in conjunction with the opening and closing mechanism 14 in accordance with the curvature of each bimetal 16.

When the short-circuit current or the overcurrent flows from the load side, the instantaneous trip device of the miniature earth leakage breaker 10 bends the bimetal 16 by the joule heat to move the trip bar 18, The movable terminal 8 is disconnected from the electrically connected state.

2 is a cross-sectional view of a miniature earth leakage breaker having an instantaneous coil device according to the prior art.

Referring to FIG. 2, the miniature earth leakage breaker 20 according to the prior art has an instantaneous coil device 22. This instantaneous coil device 22 is connected to the bimetal 16 by the line 24 when an overcurrent or a short circuit occurs from the load side and an overcurrent flows to the instantaneous coil 26 wound a predetermined number of times to form a magnetic field, The pulling core 28 located inside the instantaneous coil 26 pulls the trip bar 18 simultaneously to interrupt the power supply. Here, a magnetic field is generated in the instantaneous coil device 22, and the pulling core 28 pulls the trip bar 18 by the magnetic flux, so that the instantaneous coil device 22 is generated more than the trip due to the bending of the bimetal 18 And the trip due to the magnetic field becomes faster.

However, the small-sized earth leakage circuit breakers according to the prior art have a capacity (cut-off capacity) capable of shutting down only the overcurrent of 1.5 kA or 2.5 kA, and the fault current can not be blocked only by the bimetallic curvature characteristic when the short- .

Further, in the small earth leakage circuit breakers according to the prior art, in order to increase the breaking capacity of the pure trip device or the like, the handle opening / closing mechanism is complicated, and the bimetal and the movable terminal are fixed to the base There was a problem that it had to be fixed.

On the other hand, the small-sized earth leakage circuit breakers according to the prior art are provided with a circuit for detecting such a situation when a leakage current is generated due to dissociation of a wire installed on the load side or the like. The miniature earth leakage breaker developed so far has a problem in that it can not cope with the case where an overvoltage higher than the commercial power is inputted from the input terminal of the breaker.

The present invention is conceived to solve the problems of the prior art as described above, and it is an object of the present invention to indirectly convert a heat generation method applied to a bimetal when a short circuit occurs, The present invention provides a small leakage and circuit breaker that can be slimmed and can be assembled with a bimetal and mover fastening method to be fitted to a base, thereby maximizing the assemblability and enhancing productivity and economy.

It is another object of the present invention to provide a relatively large breaking capacity using an instantaneous tripping plate operated by the resultant of a first magnetic flux of the bimetal and a magnetic flux generated by the second magnetic flux of the fixed core against an overcurrent generated from the load side And to provide a household small leakage and wiring breaker that can be implemented.

Another object of the present invention is to provide a small leakage and circuit breaker in which an overvoltage protection circuit is added to a leakage current detection circuit so that the breaker and the load side can be protected even if an overvoltage flows from the input terminal of the breaker.

The small leakage and circuit breaker according to a preferred exemplary embodiment of the present invention includes a pair of stators connected to input terminals respectively, a pair of movable members selectively electrically connected to the respective stators, A pair of bimetals connected to each mover by a shunt twisted wire and capable of being bent by an overcurrent input, a base having a pair of load terminals electrically connected to each bimetal by a second shunt twisted wire; A handle rotatably provided on the base so as to connect the pair of mover to the pair of stator; and a handle provided on the base so as to be able to trip by separating the pair of mover from the pair of stator, An opening and closing mechanism having a trip bar that is spaced apart from the pair of bimetals so that the bimetal is contactable; A pair of fixed cores disposed on the base to surround the respective bimetals and capable of forming a magnetic body by a magnetic field formed in each bimetal when a short circuit current larger than an overcurrent is energized; And when the short-circuit current flows, the trip bar is brought into contact with the trip bar by a resultant of a magnetic field of the bimetal and a magnetic field of the fixed core derived from the bimetal before the bimetal contacts the trip bar, And a pair of instantaneous trip plates rotatably positioned between the respective bimetal and the trip bar so as to be movable.

Preferably, each of the fixed cores includes: a core insertion portion that can be inserted and fixed in the fixed core insertion groove provided in the base; A core body portion extending integrally from the core insertion portion and capable of wrapping a part of the corresponding bimetal in a 'C' shape; And a plate mounting portion extending from one side of the core body portion.

Preferably, an engaging portion coupled to the plate mounting portion; A rotating groove extending integrally with the engaging portion and capable of rotatably supporting the instantaneous trip plates; And a pair of plate guide members having an opening through which the bimetal can pass.

Preferably, each plate guide member is made of a synthetic resin.

Preferably, each of the instantaneous trip plates includes: a plate rotating projection that can be fixed to the rotating groove; A magnetic induction portion disposed on a side of the fixed core corresponding to the plate rotating projection; A trip bar contact portion disposed to face the magnetic induction portion with respect to the plate rotation protrusion so as to be in contact with the trip bar; And a bias member capable of biasing the magnetic induction unit in the bimetallic direction.

Preferably, the bias member has a tension spring connected between the magnetic induction portion and each of the plate guide members.

Preferably, each bimetal comprises: an insert capable of being inserted and fixed in a bimetal insertion groove provided in the base; A first plane portion bent from the insertion portion toward the fixed core; And a second planar portion extending at a right angle from the first planar portion.

Preferably, each mover includes: a mover contact portion provided at one end so as to be selectively in contact with the fixed contact of the corresponding stator; And a mover rotating part provided at the other end to be inserted into the mover rotating groove provided in the base.

Preferably, the breaker further comprises a cover provided with a handle opening through which the handle can protrude and engageable with the base.

Preferably, the overvoltage detection unit includes an overvoltage detection unit that is energized when the supply voltage is greater than the reference voltage and is capable of applying a current to the bobbin coil.

Preferably, the overvoltage detection unit includes: a bi-directional trigger diode for generating a trigger signal when the supply voltage is greater than a reference voltage; And a switching element which is turned on in accordance with the trigger signal and applies a current to the bobbin coil.

Preferably, the switching element is a silicon controlled rectifier (SCR).

According to another aspect of the present invention, there is provided a miniature earth leakage breaker comprising: an overvoltage detection unit that is energized when a supply voltage is greater than a reference voltage and is capable of applying a current to the bobbin coil;

Preferably, the overvoltage detection unit includes: a bi-directional trigger diode for generating a trigger signal when the supply voltage is greater than a reference voltage; And a switching element which is turned on in accordance with the trigger signal and applies a current to the bobbin coil.

Preferably, the switching element is a silicon controlled rectifier (SCR).

Preferably, the overvoltage detecting unit provides a signal to the gate of the SCR when the break-over voltage of the bidirectional trigger diode after the rectifying bridge becomes equal to or higher than the reference value when the overvoltage is 110% or more higher than the commercial power supply.

The circuit breaker according to the present invention has the following effects.

First, according to the present invention, when a relatively large overcurrent such as a short-circuit current flows, the instantaneous tripping plate, which is sucked into the fixed core by the magnetic flux generated in the fixed core before the bimetal is bent and pushes the trip bar, The trip bar is first pushed in the same direction as the curved direction of the trip bar (this operation is performed within several ms). Therefore, since the cut-off time of the small leakage and wiring breaker can be instantaneously implemented, the performance to cut off a relatively large overcurrent such as short-circuit current is improved. For example, when the small leakage and wiring breaker according to the present invention is applied, it is possible to have a short circuit current blocking capability of 120 to 200% higher than the conventional 2.5 kA breaking performance.

Second, by improving the competitiveness of the circuit breaker by simplifying the structure of the opening and closing mechanism parts constituting the circuit breaker and / or the mounting method (for example, the structure of the moving part connected with the bimetal and the mounting structure of the bimetal) It is possible to increase the productivity and assemblability of the product by assembling the specific parts in the form of fitting them into the base instead of fixing them.

Third, an overvoltage protection circuit part is additionally provided in the leakage current detection circuit part of the earth leakage breaker, so that household appliances and various loads to which the circuit breaker is applied can be safely protected from overvoltage from accidents such as N phase image formation or miswiring of the main breaker.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, And should not be construed as interpretation.
1 is a view schematically showing the construction of a small earth leakage breaker according to the prior art.
2 is a cross-sectional view of a miniature earth leakage breaker having an instantaneous coil device according to the prior art.
3 is an assembled perspective view of a miniature earth leakage and circuit breaker according to a preferred exemplary embodiment of the present invention.
4 is an exploded perspective view of the main part of FIG.
FIG. 5 is a schematic view showing an open / close mechanism portion of a small earth leakage and wiring breaker according to a preferred exemplary embodiment of the present invention, and shows an on state.
FIG. 6 is a schematic view showing an open / close mechanism portion of a small leakage and circuit breaker according to a preferred exemplary embodiment of the present invention, and shows an off state.
FIG. 7 is an assembled perspective view illustrating an instantaneous trip member portion of a circuit breaker according to a preferred exemplary embodiment of the present invention. FIG.
FIG. 8 is an exploded perspective view of FIG. 7. FIG.
Fig. 9 is a partial schematic view for explaining the operation of the instantaneous trip member of the circuit breaker shown in Figs. 3 and 4, showing the on state.
Fig. 10 is a partial schematic view for explaining the operation of the instantaneous trip member of the circuit breaker shown in Figs. 3 and 4, showing the off state.
11 is a circuit configuration diagram to which an overvoltage protection circuit is added to the leakage current circuit of the miniature earth leakage breaker according to another preferred embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 3 is a perspective view of a small leakage and circuit breaker according to a preferred embodiment of the present invention, and FIG. 4 is an exploded perspective view of the main part of FIG.

3 and 4, the breaker 100 according to the present embodiment includes a base 110, a cover 120 selectively coupled to the base 110, and a cover 120 between the base 110 and the cover 120. [ An opening and closing mechanism 102 including fixed stators 130, mobiles 136, bimetals 140, a handle 160 and a trip bar 170 interposed therebetween, stationary cores 150, An instantaneous trip member 104 including a trip plate 180 and the like, and other components such as a PCB 190.

The base 110 is formed by injection molding with plastic having insulating properties and is provided with a pair of fixed core insertion grooves 112, a pair of bimetal insertion grooves 114, and a pair of mover tongues 116 do. The base 110 also has mounting recesses 118 having various shapes and structures for receiving input and output terminals (not shown) and a housing support portion 118 that can house or support the opening and closing mechanism 102 do.

The cover 120 is coupled to the base 110 by a fastening mechanism such as a bolt or the like not shown in the state in which the above-described components are mounted on the base 110 and has a handle opening 122 through which the handle 160 can be pierced, And injection-molded with the same material as that of the base 110.

Each of the pair of stators 130 includes an input port portion 131 that can be electrically connected to an input power line of a commercial power supply and is fixed to the base 110, And a fixed contact portion 133 selectively in contact with the contact portion 135.

The pair of mover 136 is inserted into the mover contact groove 135 and the mover contact portion 135 which can be selectively contacted to the corresponding fixed contact portion 133, And a fixed mover turning portion 137 is provided. The middle portion of each mover 136 is inserted into a mover insertion slot 65 provided on both sides of the cross bar 165 of the opening and closing mechanism 102 described later. Therefore, each of the mover 136 is configured to rotate at a predetermined angle or at a predetermined distance around the mover turning portion 137. [ On the other hand, each of the mover 136 preferably has a leaf spring structure so as to have elasticity.

A pair of bimetals 140 is connected to the corresponding mover 136 by a respective first shunt twisted pair 142. Each of the bimetals 140 is made of a material having a curvature characteristic that can be curved by an overcurrent flow. Each of the bimetals 140 can be electrically connected to the energizing circuit of the corresponding stator 130 and the mover 136. When the overcurrent is energized at the load side, the bimetal 140 is curved and the trip bar 170 And the trip lever 162 connected to the trip bar 170 is separated from the stopping protrusion 172 of the trip bar 170 so that the handle opening and closing mechanism 102 operates as a trip position to move from the stator 130 to the mover 136 to disconnect the circuit. Each of the bimetals 140 includes an insertion portion 141 that can be inserted and fixed in the bimetal insertion groove 114 provided in the base 110, A first plane portion 143 and a second plane portion 145 extending at right angles from an end of the first plane portion 143.

The pair of load terminals 124 includes an output port portion 126 fixed to the base 110 so as to be electrically connected to an output power line on the load side (not shown), and an insertion portion (not shown) of the corresponding bimetal 140 And an output lead 128 electrically connected to the output port portion 126 and electrically connected to the other end of the second shunt twisted wire 144 having one end connected to the protruding side of the output shunt portion 141.

FIG. 5 and FIG. 6 are schematic views each showing an open / close mechanism portion of a small leakage and breaker for a short circuit according to a preferred exemplary embodiment of the present invention.

3 to 6, the opening and closing mechanism 102 includes a handle frame 161, a handle 160, a trip bar 170, a trip lever 162, a cross bar 165, and a hook 175 Respectively.

The handle frame 161 is fixed to the base 110 by bolts (not shown) and is made of a rigid body. The handle frame 161 includes a first pivot hole provided with a first pivot shaft 163 capable of pivotally supporting the center of the handle 160 and a second pivot hole through which one end (lower end) of the trip bar 170 can be pivotally supported A second pivot hole through which the second coaxial shaft 164 is installed, and a slot through which the hook 175 can be inserted to move in a predetermined path.

The handle 160 is installed on the base 110 so as to selectively electrically turn on and off the pair of stators 130 and the pair of mover 136. The handle 160 can be pivoted with respect to the handle frame 161 by the first pivot 163, as described above. The handle 160 is made of an electrically insulating material. In addition, since the handle 160 protrudes outside the cover 120 through the handle opening 122 of the cover 120, the user can selectively manipulate the handle 160. The handle 160 is elastically biased in the direction of the trip bar 170 by a spring (not shown). A first hook hole, which is inserted into one end of the hook 175 and can be rotated, is provided at a lower end of the handle 160.

The trip bar 170 is a part of a trip device for separating the mover 136 from the stator 130 and is spaced apart from the bimetal so that the bimetal is contactable. One end of the trip bar 170 is rotatably mounted on the handle frame 161 by a second pivot 164 and the other end of the trip bar 170 corresponds to the position of the pair of bimetals 140 And a pair of contact portions 171 that can branch from one end and can be in contact with the bimetal 140, respectively. The trip bar 170 is injection molded by plastic, and the contact bolts are fastened to the respective contact portions 171. As described above, the trip bar 170 is provided with a fixing jaw 172 which can be selectively fastened to the locking portion 64 of the trip lever 162. [

The trip lever 162 has a latching portion 64 provided at one end, a pressing portion 66 provided at the other end and coupled to the cross bar 165 to press the cross bar 165, (Not shown) which is provided between the hooks (66) and into which the other end of the hook (175) is inserted.

The cross bar 165 is accommodated in a slide part 111 provided in the base 110 and is movable in a predetermined distance. The cross bar 165 is biased in the direction of the handle 160 by a spring (not shown) And is moved in the direction of the base 110 by the pressing portion 66. The cross bar 165 is provided with a mover insertion slot 65 into which the middle portion of each mover 136 can be inserted, as described above. Therefore, the mover 136 can be selectively moved by the movement of the cross bar 165. [

FIG. 7 is an assembled perspective view illustrating an instantaneous trip member portion of a circuit breaker according to a preferred exemplary embodiment of the present invention, and FIG. 8 is an exploded perspective view of FIG.

3, 4, 7 and 8, the instantaneous trip members 104 of the circuit breaker 100 of the present embodiment are respectively fixed to the base 110 so as to surround the corresponding bimetals 140 A pair of fixed cores 150 capable of forming a magnetic body by a magnetic field formed in a corresponding bimetal 140 when a short-circuit current larger than an overcurrent is energized, The first magnetic field generated by the bimetal 140 and the second magnetic field generated by the bimetal 140 and corresponding to the fixed core 150 before the trip bar 170 contacts the trip bar 170 A pair of instantaneous trip plates 180 rotatably positioned between the bimetal 140 and the trip bar 170 so as to be able to move the trip bar 170 in the tripping direction, The instantaneous trip plate 180 is secured And a pair of plate guide members 185 for supporting rotatably the control unit 150.

Each of the fixed cores 150 includes a core insertion portion 152 that can be inserted and fixed in a fixed core insertion groove 112 provided in the base 110, A core body portion 154 that can wrap a first planar portion 143 and a second planar portion 145 in a substantially 'C' shape, and a portion of the core body portion 154 And has a plate mounting portion 156 extending therefrom. The fixed core 150 is integrally fabricated using a magnetic material. The core body portion 154 has a proper shape and structure so as to meet the requirements required for the magnetic field formation for instantaneous tripping operation, considering the design interval with the bimetal 140 and the design interval of the instantaneous trip plate 180 It will be appreciated by those skilled in the art.

Each fixed core 150 is added to a magnetic flux formed around the bimetal 140 when a short-circuit current is energized on the load side to provide an increased magnetic flux than such flux, And the bimetal 140, the instantaneous trip plate 180 is sucked into the stationary core 150 in a moment.

Each of the plate guide members 155 has a plate engaging portion 153 which is engaged with the plate attaching portion 156 of the corresponding fixed core 150 and a corresponding one of the momentary trip plates 180 And a bimetal opening 159 through which the corresponding bimetal 140 can pass. The bimetal 140 has a bimetal opening 159 through which the bimetal 140 can pass. The plate guide member 155 is integrally made of plastic or synthetic resin having a non-magnetic property.

Each instantaneous trip plate 180 has a plate rotating projection 182 that can be inserted into the plate rotating groove 157 and a magnetic induction portion 182 disposed on the side of the fixed core 150 corresponding to the plate rotating projection 182, A trip bar contact portion 186 disposed opposite to the magnetic induction portion 184 with respect to the plate rotation protrusion 182 so as to be in contact with the trip bar 170 and the magnetic induction portion 184 to the bimetal 140 (Not shown) that can be biased in the X-direction. Each instantaneous trip plate 180 is fabricated using a magnetic body. The bias member is preferably a tension spring connected between the magnetic induction portion 184 and the plate guide member 155.

Accordingly, when a short-circuit current larger than the overcurrent flows in the energizing circuit, the instantaneous trip plate 180 is formed around the fixed core 150 and the bimetal 140 before the bimetal 140 curves and contacts the trip bar 170. [ The magnetic guide portion 184 is moved in a momentary manner toward the stationary core 150 by the combined magnetic flux and the trip bar contact portion 186 moves in a direction opposite to the moving direction of the magnetic induction portion 184, The trip bar 170 is tripped by pushing the trip bar 170 in the same direction as the bending direction of the bimetal 140 by bringing the trip bar 170 into contact.

The operation of the opening / closing mechanism and the instantaneous trip member as described above will be described below.

First, the operation of the opening and closing mechanism 102 of the circuit breaker 100 according to a preferred exemplary embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG.

5, the handle 160 is positioned on the left side of the drawing and includes a stator 130, a mover 136, a first shunt twisted wire 142, a bimetal 140, a second shunt twisted wire 142, The hook 175 coupled to the first hook hole of the handle 160 is in a downward direction when the electric power input through the commercial power source is continuously transmitted to the load side via the first terminal 144 and the load terminal 124, The trip lever 162 is moved together with the trip lever 162 and the latching portion 64 of the trip lever 162 is caught by the latching jaw 172 of the trip bar 170. When the trip lever 162 is pressed, The portion 66 moves the cross bar 165 downward.

In this state, for example, when an overcurrent of 120% or 200% or more of the rated current flows in the energizing circuit, the bimetal 140 curves rightward in the state of FIG. 5, Of the trip bar 170 directly pushes the upper end of the trip bar 170 to move the trip bar 170 in the right direction of FIG. 6, the engaging portion 64 of the trip lever 162, which is engaged with the engaging jaw 172 of the trip bar 170, is released from engagement with the engaging jaw 172, And the movable bar 136 is moved upward together with the movement of the cross bar 165 toward the handle 160 (upward in the figure) by the restoring force of the spring The stator 130 and the mover 136 are turned off to cut off the overcurrent. In this 'overcurrent' situation, the fixed core 150 and the instantaneous trip plate 180 do not operate.

Second, the instantaneous tripping action of the circuit breaker 100 according to a preferred exemplary embodiment of the present invention will be described.

Figs. 9 and 10 are partial extractor diagrams for respectively explaining the operation of the instantaneous trip member of the circuit breaker shown in Figs. 3 and 4. Fig.

First, as shown in Fig. 9, when a short-circuit current several tens of times larger than the rated current flows in the energizing circuit under the same condition as that of Fig. 5, the position of the opening / A second magnetic flux instantaneously occurs in the fixed core 150 due to the induction action of the first magnetic flux and an added strong magnetic flux of the first magnetic flux and the second magnetic flux is generated in the instantaneous trip plate 180 to the fixed core 150 side (the left direction in FIG. 7). The tripping contact portion 186 of the instantaneous tripping plate 180 is in the same direction as the bending direction of the bimetal 140 and is opposite to the moving direction of the magnetic induction portion 184 in the process of sucking the magnetic induction portion 184 toward the fixed core 150 (The right direction in FIG. 7) and pushes the trip bar 170 to the right. Then, by the same principle as described above, the trip lever 162 is separated from the trip bar 170, and the handle 160 rotates to the right side and the cross bar 165 The energization of the energizing circuit is shut off instantly by the instantaneous trip operation in which the movable element 136 is separated from the stator 130 while ascending.

3 and 4, a circuit breaker 100 according to a preferred embodiment of the present invention is provided with a PCB 190 designed for a leakage current circuit and an overvoltage detection circuit, (Not shown) coupled to the bobbin (not shown) and the trip bar 170 mounted on the PCB 190 for tripping the trip bar 170 under certain conditions and capable of relative movement with respect to the bobbin.

The leakage current circuit of the PCB 190 is for turning off the energizing circuit when a short circuit occurs due to various factors such as electric shock or flooding on the load side while the circuit breaker is operated and energized. That is, when a short circuit occurs, a potential generated in an unbalanced state by an unillustrated ZCT is outputted to a comparison amplifier, and this potential attracts a pull core inserted into the bobbin by flowing a current through a magnetic coil having a function of a driving portion. The pulling core then pulls the trip bar 170 away from the bimetal 140 and enables tripping as described above.

11 is a circuit configuration diagram to which an overvoltage protection circuit is added to the leakage current circuit of the miniature earth leakage breaker according to another preferred embodiment of the present invention.

11, the entire circuit 80 of the PCB of the miniature earth leakage breaker according to another preferred embodiment of the present invention includes an overvoltage detector (not shown) which is energized when the supply voltage is greater than the reference voltage, 82).

The overvoltage detector 82 includes a bi-directional trigger diode 84 for generating a trigger signal when the power supply voltage is higher than the reference voltage, and a switching element 86 conducting in accordance with the trigger signal to apply a current to the bobbin coil. The switching element 86 is preferably a silicon controlled rectifier (SCR). In Fig. 11, reference numeral 85 denotes a conventional leakage current detection circuit, and reference numeral 88 denotes a bobbin core assembly.

For example, when the overvoltage detection unit 82 according to the preferred embodiment of the present invention is added to the leakage current detection circuit 80 of a general single-phase circuit breaker, the overvoltage detection unit 82 is connected to the commercial power supply unit 81 Over voltage of 110% or more of the commercial power supplied from the commercial power supply unit 81 is inputted to the rectifier circuit unit 83 at the next stage and when the over-voltage is equal to or higher than the reference value of the break-over voltage of the bidirectional trigger diode 84, (80) is turned on to give a signal to the gate of the switching element (86) such as SCR to operate the switching element (86). 3 and 4 of the above-described embodiment, the switching element 86 receiving the signal is internally turned on to apply a current to the bobbin coil assembly 88, so that the instantaneous solenoid operation causes the bobbin coil assembly The trip bar 170 connected to the pulling core is moved and the handle 160 of the opening and closing mechanism 102 is moved from the stator 130 to the mover 136 are disconnected to cut off the power supply of the energizing circuit.

It will be understood by those skilled in the art that the small earth leakage breaker with the overcurrent detection circuit according to the preferred exemplary embodiment of the present invention can be applied to all the earth leakage breakers equipped with instant trip members according to the prior arts other than the small earth leakage breaker of the above- Will fully understand.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited thereto and that various changes and modifications will be apparent to those skilled in the art, And various modifications and variations are possible within the scope of the appended claims.

100 ... breaker 102 ... opening and closing mechanism
104 instantaneous trip member 110 base
112 ... fixed core insertion groove 114 ... bimetal insertion groove
116 ... mover rotating groove 118 ... accommodating support
120 ... cover 130 ... stator
136 ... mover 140 ... bimetal
142 ... first shunt strand 144 ... second shunt strand
150 ... fixed core 153 ... plate coupling portion
157 ... plate rotating groove 160 ... handle
161 ... handle frame 162 ... trip lever
165 ... crossbar 170 ... trip bar
172 ... hooking jaw 175 ... hook
180 ... instantaneous trip plate 182 ... plate rotating projection
184 ... magnetic induction portion 186 ... trip bar contact portion

Claims (16)

A pair of stators each connected to the input terminals, a pair of mobiles that can be selectively electrically connected to each stator, a first shunt twisted wire connected to each mover and capable of being bent by an overcurrent input A pair of bimetals, a base having a pair of load terminals electrically connected to each bimetal by a second shunt twist;
A handle rotatably provided on the base so as to connect the pair of mover to the pair of stator; and a handle provided on the base so as to be able to trip by separating the pair of mover from the pair of stator, An opening and closing mechanism having a trip bar that is spaced apart from the pair of bimetals so that the bimetal is contactable;
A pair of fixed cores disposed on the base to surround the respective bimetals and capable of forming a magnetic body by a magnetic field formed in each bimetal when a short circuit current larger than an overcurrent is energized; And
A magnetic induction portion capable of moving by the resultant of the magnetic field of the bimetal and the magnetic field of the fixed core derived from the bimetal before the bimetal contacts the trip bar when the shorting current flows, And a trip bar contact portion which is arranged to face the magnetic induction portion with respect to the rotation protrusion and movable in a direction opposite to the movement direction of the magnetic induction portion, wherein the pair of instantaneous positions located between the respective bimetal and the trip bar Circuit breakers and trip circuits.
The method according to claim 1,
Each stationary core comprises:
A core insertion portion which can be inserted and fixed in a fixed core insertion groove provided in the base;
A core body portion extending integrally from the core insertion portion and capable of wrapping at least a portion of the corresponding bimetal in a 'C'shape; And
And a plate mounting portion extending from one side of the core body portion.
The method of claim 2,
A coupling portion coupled to the plate mounting portion;
A rotating groove extending integrally with the engaging portion and capable of rotatably supporting the instantaneous trip plates; And
Further comprising a pair of plate guide members having openings through which the bimetal can pass.
The method of claim 3,
Wherein each of the plate guide members is made of synthetic resin.
The method according to claim 1,
And a biasing member capable of biasing the magnetic induction portion in the bimetallic direction.
The method of claim 5,
Wherein the biasing member includes a tension spring connected between the magnetic induction unit and each of the plate guide members.
The method according to claim 1,
Each bimetal is:
A bimetal insertion groove formed in the base;
A first plane portion bent from the insertion portion toward the fixed core; And
And a second flat surface portion extending perpendicularly from the first flat surface portion.
The method according to claim 1,
Each mover has:
A mover contact portion provided at one end to selectively contact the fixed contact of the corresponding stator; And
And a mover rotating portion provided at the other end to be inserted into a mover rotating groove provided in the base.
The method according to claim 1,
Further comprising a cover provided with a handle opening through which the handle can protrude and engageable with the base.
The method according to claim 1,
And an overvoltage detection section that is energized when the supply voltage is greater than the reference voltage and capable of applying a current to the bobbin coil.
The method of claim 10,
Wherein the overvoltage detection unit comprises:
A bi-directional trigger diode for generating a trigger signal when the supply voltage is greater than a reference voltage; And
And a switching element which conducts in accordance with the trigger signal and applies a current to the bobbin coil.
The method of claim 11,
The switching device includes:
Characterized in that the circuit breaker is a silicon controlled rectifier (SCR).
The method according to claim 1,
Further comprising an overvoltage detection unit which is energized when the supply voltage is higher than the reference voltage and is capable of applying a current to the bobbin coil.
14. The method of claim 13,
Wherein the overvoltage detection unit comprises:
A bi-directional trigger diode for generating a trigger signal when the supply voltage is greater than a reference voltage; And
And a switching element which conducts in accordance with the trigger signal and applies a current to the bobbin coil.
15. The method of claim 14,
The switching device includes:
Characterized in that the circuit breaker is a silicon controlled rectifier (SCR).
14. The method of claim 13,
Wherein the overvoltage detection unit blocks a gate of the SCR by giving a signal to the gate of the SCR when the break-over voltage of the bidirectional trigger diode after the rectifying bridge becomes equal to or greater than the reference value when the overvoltage is 110% or more higher than the commercial power supply.

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