KR101795767B1 - apparatus for earth leakage circuit breaker - Google Patents

Abstract

To increase economical productivity with a simplification of components, and to improve the reliability of driving a test switch, the present invention provides a circuit breaker comprising: a body unit which is coupled to a cover where a pressurized test switch is penetrated, and has a power terminal part and a load terminal part on both sides thereof; a trip switching unit which is mounted on the body unit, switches a selective connection of the power terminal part and the load terminal part, and has a trip driving part for operating a trip when electric leakage is detected; a zero current transformer which is provided to be penetrated by connecting wires of the power terminal part and the load terminal part and senses the electric leakage; a solenoid unit which comprises a bobbin having coils on which a driving power of a plunger for operating the trip driving part is applied when the electric leakage is sensed by the zero current transformer; a printed circuit board which has a circuit board coupled to a rear side of the zero current transformer and the solenoid unit, and controlling application of the driving power; a spacing support member which is made from electrical insulating materials to maintain a gap space between a rear surface of the solenoid unit and a front surface of the printed circuit board; a test pin which penetrates the printed circuit board and is placed inside of the gap space; and an elastic contact piece which penetrates the spacing support member from one end portion penetrating the printed circuit board and fixed, and extends and is curved in multi-stage, such that the other end portion is elastically contacted to the test pin according to a press force of the test switch.

Description

An apparatus for earth leakage circuit breaker,

More particularly, the present invention relates to an electric leakage preventing device in which driving reliability of a test switch is improved while manufacturing economics are improved by simplifying constituent parts.

Generally, for the prevention of fire or electric shock, the panel board used in the home uses a molded case circuit breaker (MCCB) and many earth leakage circuit breakers (ELCB).

Here, the wiring breaker is used for protecting the electric wire. In addition, the earth leakage breaker is used for protecting the user and preventing fire by detecting the electric shock or overcurrent while the user is using the electric device and shutting off the power.

In detail, in the conventional earth leakage breaker, the handle is operated so that the cross bar is lowered, so that the power source current inputted as the movable contact comes into contact with the fixed contact passes through the input terminal, the fixed contact, the movable contact and the bimetal, do.

At this time, when the overcurrent flows from the wire passing through the bridge transformer, the bimetal bends and pushes the trip bar. When a short circuit occurs, a signal is transmitted from the video current transformer to the driving coil of the printed circuit board, so that the core pulls the trip bar. Therefore, the lever is immediately lifted by the trip bar, so that the cross bar is lifted and the movable contact is separated from the stationary contact to interrupt the flow of power.

On the other hand, in the conventional earth leakage breaker, a test section is provided for testing a leakage preventing function in the event of a leakage. In detail, the test portion includes a test button, an elastic piece, and a test pin. At this time, when the test button is pressed and the elastic piece is brought into contact with the test pin, an overcurrent is applied to the video current transformer and the current is controlled to flow through the driving coil of the printed circuit board.

However, in the conventional circuit breaker, a supply pin connected to both ends of the drive coil for supplying power to the drive coil of the printed circuit board and a separate test pin for contacting the elastic piece are mounted, .

Further, as the number of parts of the test part increases, the assembling time is delayed in the manufacturing process, the production economical efficiency is lowered, and the operation speed is slowed down during the test process.

Further, when the resilient restoring force is reduced due to the occurrence of deformation, abrasion, or the like due to long use of the elastic piece supporting the test button, there is a problem that the return operation of the test button becomes inaccurate or malfunction occurs.

Korean Registered Utility Model No. 20-0292540

SUMMARY OF THE INVENTION In order to solve the above-described problems, the present invention provides a leakage preventing device that is simplified in component parts to improve manufacturing economics and in which driving reliability of a test switch is improved.

According to an aspect of the present invention, there is provided a test apparatus comprising: a body portion having a power terminal portion and a load terminal portion on both sides of a cover through which a pressure test switch is passed, A trip switching part mounted on the body part and having a trip driving part for switching a selective connection between the power terminal part and the load terminal part and a tripping part for tripping upon detecting a leakage current; A video current transformer that is connected to the power terminal portion and the load terminal portion so as to detect a short circuit; A solenoid unit including a bobbin wound with a coil to which driving power of a plunger for driving the trip driving unit is applied when a short circuit is detected in the video current transformer; A printed circuit board having a circuit transformer coupled to a rear side of the solenoid unit and controlling the application of the driving power; A spacing support member formed of an electrically insulating material so that a gap space is maintained between the rear surface of the solenoid portion and the front surface of the printed circuit board; A test pin disposed inside the gap space through the printed circuit board; And an elastic contact member which extends from the one end fixed through the printed circuit board through the spacing support member and extends forward and is bent in a multi-step manner so that the other end elastically contacts the test pin in accordance with the pressing force of the test switch. Wherein the spacing support member includes a support plate portion having the solenoid portion coupled to the front surface thereof and the test pin penetratingly fixed to the support plate portion and having a through hole for fixing the support plate portion to the support plate portion, Wherein the elastic contact piece includes a fixed extension portion through which one end of the elastic contact piece is fixed through the printed circuit board while the other end of the elastic contact piece penetrates through the through hole, A dispersion supporting portion which is bent and extended upwardly inclined from the other end of the fixed extending portion, A support extension portion vertically extending upwardly so as to have a length longer than an upper end of the support plate portion and connected to the end of the support extension portion and disposed on the upper side of the support plate portion, A contact extension portion extending in parallel to the fixed extension portion such that an end thereof faces an opened upper side of the gap space and an upper surface of the contact extension portion is in contact with a lower end portion of the test switch; And a terminal contact portion contacting the test pin corresponding to a pressing force of the test switch, wherein a vertical interval between the upper end portion of the support plate portion and the contact extension portion is set to exceed a vertical interval between the end portion of the terminal contact portion and the test pin And an earth leakage preventing device.

The test apparatus may further include a fixed power supply pin disposed in the gap space through the printed circuit board, wherein the coil has one end connected to the test pin and the other end connected to the fixed power supply pin, And each of the fixed power pins is electrically connected to the load terminal portion.

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Through the above-mentioned solution, the electric leakage preventing device according to the present invention provides the following effects.

First, since the elastic contact piece is supported in multiple on the lower edge of the through hole and the upper edge of the support plate, the contact extension extending to contact the test switch is repeatedly pressed Plastic deformation is minimized even when operated, and the durability and drive reliability of the product can be further improved.

Second, even though the pressing force of the test switch is excessively applied, the elastic contact piece is elastically supported by the dispersion supporting portion bent upwardly between the fixed extending portion and the contact extending portion, so that deformation or abrasion is prevented and the durability of the product is further improved .

Thirdly, the terminal contact portion is vertically bent from the contact extension portion, and the contact reliability is improved because the contact portion is brought into contact with the outer surface of the test pin accurately in a state where the elastic deformation is minimized corresponding to the direction of the pressing force applied from the test switch.

Fourthly, the test pin and the fixed power supply pin, which are disposed inside the gap space through the printed circuit board, are electrically connected to the load terminal unit so that both ends of the coil are connected to each other and drive power of the solenoid unit is applied. And a supporting member are not required, so that the number of parts can be reduced and the assembling property and production economics can be improved.

FIG. 1 is a side view showing a state in which a part of a cover is cut in an electric leakage screening device according to an embodiment of the present invention to expose a coupling structure of the component parts. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric leakage preventing apparatus,
FIG. 3A and FIG. 3B are views showing examples of pressing operation of the test switch in the electrical leak detecting apparatus according to the embodiment of the present invention; FIG.
4 is a circuit diagram showing an electric leakage screening device according to an embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an earth leakage preventing device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing a state where a part of a cover is cut off in a leakage current blocking device according to an embodiment of the present invention, 3A and 3B are explanatory diagrams showing driving states of a test switch in an electrical leak detecting apparatus according to an embodiment of the present invention. Circuit breaker according to an embodiment of the present invention.

1 to 4, an earth leakage breaker 100 according to an embodiment of the present invention includes a main body 10, a trip switching unit 20, a video current transformer 30, a solenoid unit 40, And includes a printed circuit board 50, a spacing support member 60, a test pin 70a, and an elastic contact piece 80.

The body 10 includes a base portion 10a on which component parts are mounted and a cover 10b detachably coupled to cover the upper portion of the base portion 10a. In detail, the power supply terminal portion 11 and the load terminal portion 12 are provided on both sides of the base portion 10a. The power terminal portion 11 is provided on the front side of the base portion 10a and the load terminal portion 12 is provided on the rear side of the base portion 10a.

The power switch unit 13 is interposed between the power terminal unit 11 and the load terminal unit 12 so as to be electrically connected to the trip switch unit 20 so as to be electrically connected to the trip switch unit 20. Here, the power switch unit 13 includes a fixed contact 13a and a movable contact 13b. The fixed contactor 13a may be connected to the power terminal portion 11 to be fixed to the base portion 10a and the movable contactor 13b may be connected to the load terminal portion 12, 13a. ≪ / RTI >

The cover 10b covers the upper portion of the base portion 10a and is detachably coupled to the base portion 10a. At this time, a handle through hole may be formed on one side of the upper portion of the cover 10b to expose an upper end of a handle switch unit 21, which will be described later.

A test switch 15 for inserting an overcurrent state is inserted in the upper portion of the cover 10b through a switch insertion hole 16 so as to test whether the earth leakage breaker 100 operates normally. Here, a locking step 16a is stepped on the inner surface of the switch insertion hole 16 in a radially inward direction.

At this time, the test switch 15 is formed with a stepped switch portion 15a at the upper end so as to be caught by the latching step 16a, and a lower end portion is extended to penetrate the switch insertion hole 16. A detachment preventing portion 15b formed to exceed the diameter of the switch insertion hole 16 is provided at a lower end of the test switch 15. Accordingly, when the test switch 15 is moved upward, the detachment preventing portion 15b is engaged with the lower edge of the switch insertion hole 16 to prevent the detachment.

That is, the test switch 15 is located at a position where the switch stepped portion 15a is caught by the latching step 16a and the release preventing portion 15b is caught by the lower edge portion of the switch insertion hole 16 And can be spaced up and down in correspondence to the interval between the points.

The trip switching unit 20 includes the handle switch unit 21, the trip driving unit 22, and the bimetal 23. Here, the handle switch portion 21 is disposed between the trip positions where the fixed contact 13a and the movable contact 13b are in contact with or separated from each other. The handle switch unit 21 may be coupled to the trip mounting unit 14 fixed to the base unit 10a. A pin member is inserted into a hinge hole 14a formed to pass through a lower end of the handle switch unit 21 and an upper end of the trip mounting unit 14. The handle switch unit 21 is inserted into the pin member And is elastically supported in the trip position direction by an elastic member such as a torsion spring.

Here, a lever interlocked with the rotation of the handle switch unit 21 is coupled to the lower end of the handle switch unit 21. At this time, the lever can be selectively locked so that the trip position of the handle switch unit 21 is maintained in a fixed state.

Meanwhile, the trip driving unit 22 is provided to perform a trip operation to release the locked state of the lever. At this time, the trip driving unit 22 is disposed on the rear side of the lever, and the hinge provided at the lower end portion is hingedly connected to the trip mounting unit 14 so as to be rotatable. An elastic member such as a torsion spring is interposed in the hinge portion of the trip driving portion 22 so that the trip driving portion 22 is elastically supported in the direction of the trip mounting portion 14.

At this time, when the trip driving unit 22 is driven and pulled, the latch connected to the trip driving unit 22 is moved downward, and the locking operation of the lever is released corresponding to the movement of the latch.

A bimetal 23 is disposed on the front side of the trip driver 22. Here, the bimetal 23 is formed by joining two kinds of metal plates having different thermal expansion coefficients, and is bent toward the trip driving unit 22 when an overcurrent is generated. Accordingly, the bimetal 23 rotates the trip driving unit 22 when an overcurrent occurs, thereby releasing the locked state of the lever.

On the other hand, on the rear side of the trip driving unit 22, the video current transformer 30 for detecting a short circuit is provided. The printed circuit board 50 may include a wire communication hole 51 corresponding to the wire through hole 31. The wire communication hole 51 may be formed in the shape of a cylinder having a wire through hole 31 formed at the center thereof, Is formed.

A pair of connection terminals 34a and 34b provided at one side of the frame current transformer 30 is fixed by soldering through a pair of holes formed in the printed circuit board 50 through wave soldering equipment.

A connection wire 17 to which the power terminal portion 11 and the load terminal portion 12 are connected is passed through the wire through hole 31 and the wire communication hole 51 . The transducer (30) senses a short circuit from the connection wire (17) and transmits a signal.

A fixing pin 33 provided on the other side of the video current transformer 30 is provided to surround the other side of the video current transformer 30 and has a pair of holes formed on the printed circuit board 50 at both ends thereof And is soldered through the wave soldering equipment.

At this time, the fixing pin 33 may be provided as a wire to which the current transformer 30 is fixed while moving the current. In detail, the fixing pin 33 may be electrically connected to the test pin 70a and the elastic contact piece 80 so that a test current is applied. When the test current is applied, the overcurrent State can be induced.

Accordingly, the transducer 30 is firmly fixed to the printed circuit board 50 by the pair of connection terminals 34a, 34b and the fixing pin 33, while the one side portion and the other side portion are firmly fixed to the printed circuit board 50, There is no need for a separate electric wire through which the test current is applied through the hole 31, so that the number of parts can be reduced and productivity and assemblability can be improved.

The solenoid unit 40 includes a bobbin 41, a coil 42, and a plunger 43. At this time, the bobbin 41 is formed in a cylindrical shape, and a plunger insertion hole 41a is formed at the center so that the plunger 43 is inserted. The coil 42 is wound on the outer circumferential surface of the bobbin 41. One end of the coil 42 is connected to the test pin 70a and the other end of the coil 42 is connected to a fixed power pin 70b .

The plunger 43 may be inserted into the plunger insertion hole 41a and selectively moved in the forward and backward directions along the plunger insertion hole 41a. At this time, a driving connection part 43a connected to the trip driving part 22 is provided on the front side of the plunger 43. [

When the driving power is applied to the coil 42, the plunger 43 is moved backward by a magnetic force, and the trip driving part 22 connected to the driving connection part 43a is also pulled back A trip operation can be performed.

The printed circuit board 50 is disposed on the rear side of the image deflector 30 and the solenoid unit 40 and is coupled to the base unit 10a. The circuit board 50 is mounted with a circuit unit 90 for controlling application of driving power to the plunger 43 so as to perform a trip operation by receiving a signal from the video current transformer 30 .

At this time, the procedure of performing the trip operation of the earth leakage protection device 100 is as follows. First, the video current transformer 30 transmits a signal to the circuit unit 90 when a short circuit is detected. When the signal from the video current transformer 30 is received, the circuit unit 90 applies the driving power of the plunger 43 to the solenoid unit 40.

When the driving power is applied to the solenoid unit 40, the plunger 43 is moved backward along the plunger insertion hole 41a by the magnetic force generated by the coil 42. [ At this time, as the drive connection portion 43a is connected to the trip driving portion 22, the trip driving portion 22 is pulled backward in accordance with the movement of the plunger 43, and the locked state of the lever is released. Thus, the handle switch unit 21 is rotated to the trip position where the fixed contact 13a and the movable contact 13b are separated, and the trip operation can be performed.

On the other hand, the spacing support member 60 is coupled to the rear side of the solenoid portion 40. At this time, the spacing support member 60 is formed of an electrically insulating material and includes a support plate portion 61 and a spaced side wall portion 62. In detail, the solenoid unit 40 is coupled to the front surface of the support plate 61. The bobbin 41 may be detachably coupled to the front surface of the support plate 61. The bobbin 41 may be attached to the support surface of the solenoid 40, Or may be provided integrally with the plate portion 61.

The spacing side wall portion 62 extends from the rim of the supporting plate portion 61 toward the rear side. At this time, the spacing side wall portion 62 may be provided on both sides of the support plate portion 61 in the width direction, and may be formed to have a length corresponding to the back surface of the support plate portion 61 and the front surface of the printed circuit board 50 Can be extended.

A gap space 60a having upper and lower openings may be formed in the rear surface of the support plate 61 and the spacing side wall portion 62. The rear surface of the solenoid portion 40 and the printing The gap space 60a can be held between the front surface of the circuit board 50 by the spacing support member 60. [

Meanwhile, the test pin 70a may be provided in a bar shape having a circular or polygonal cross section. The test pin 70a is disposed inside the gap space 60a and inserted into the upper pin fixing hole 53a formed on the printed circuit board 50 so as to penetrate the printed circuit board 50, And is fixed by soldering. The other end of the test pin 70a is inserted into the upper fin through hole 61b formed in the support plate 61 or is inserted into the support plate 61 by a method such as adhesion after insertion.

Here, the fixing power pin 70b disposed through the printed circuit board 50 is further provided inside the gap space 60a. Here, the fixed power pin 70b may have a shape substantially corresponding to the test pin 70a.

The fixed power supply pin 70b is disposed inside the gap space 60a and one end of the fixed power supply pin 70b is inserted into the lower pin fixing hole 53b formed in the printed circuit board 50 to penetrate the printed circuit board 50 Is inserted and fixed by soldering. The other end of the fixed power supply pin 70b is inserted into the lower pin through hole 61c formed in the support plate 61 or coupled with the support plate 61 by a method such as adhesion after insertion .

The test pin 70a may be disposed adjacent to the upper end 63 of the support plate 61 and the fixed power pin 70b may be disposed adjacent to the lower end of the support plate 61. The solenoid unit 40 may be disposed between the test pin 70a and the fixed power source pin 70b and may be coupled to the front surface of the support plate 61. [

At this time, it is preferable that one end of the coil 42 is connected to the test pin 70a and the other end is connected to the fixed power supply pin 70b. The test pin 70a and the fixed power supply pin 70b may be electrically connected to the load terminal unit 12 such that the coil 42 is supplied with driving power. That is, one of the test pin 70a and the fixed power pin 70b may be connected to the live wire of the load terminal unit 12, and the other end thereof may be connected to the neutral wire of the load terminal unit 12.

Accordingly, the test pin 70a and the fixed power supply pin 70b can firmly support the upper and lower ends to prevent deformation or detachment of the spacing support member 60, so that the durability of the product can be improved.

The test pin 70a and the fixed power supply pin 70b are electrically connected to the solenoid 40 so that the driving power of the plunger 43 is applied thereto. The assemblability and the production economics can be improved.

Particularly, the test pin 70a is connected to supply the driving power through the coil 42, and in order to test whether the electric leakage preventing device 100 operates normally according to the contact of the elastic contact piece 80, Since the overcurrent is electrically connected to the video current transformer 30, the number of parts that perform each function is reduced, thereby improving the economical efficiency.

The elastic contact piece 80 extends from the one end fixed through the printed circuit board 50 through the spacing support member 60 to the front side and bent at the other end so that the other end of the elastic contact piece 80 contacts the test switch 15 So as to be elastically contacted with the test pin 70a. At this time, the elastic contact piece 80 is preferably made of a phosphor bronze material used for manufacturing a spring or the like so as to have an elastic restoring force. The resilient contact piece 80 acts as a resistor to induce an overcurrent to the video current transformer 30. [

Here, the elastic contact piece 80 includes a fixed extension portion 81, a dispersion support portion 82, a support extension portion 83, a contact extension portion 84, and a terminal contact portion 85.

In detail, one end of the fixed extension portion 81 is fixed to the printed circuit board 50 by soldering. At this time, a stopper stepped portion 81a is integrally formed at one end of the fixed extension portion 81 so as to be inserted into the elastic piece fixing hole 55 formed in the printed circuit board 50.

At this time, the width of the stopper stepped portion 81a may be set to be less than the width of the other end of the fixed extension portion 81 and be stepped. The length of the stopper stepped portion 81a may be set to correspond to the length of the elastic piece fixing hole 55. Accordingly, the stopper stepped portion 81a can be fitted into the elastic piece fixing hole 55 and fixed by soldering.

The stepped portion of the stopper stepped portion 81a and one end of the fixed extension portion 81 is hooked on the front surface of the printed circuit board 50 and inserted into the printed circuit board 50 And may be limited to correspond to a predetermined length. Accordingly, since the fixed extension portion 81 is inserted and fixed to the front surface of the printed circuit board 50 so that the stepped portion is hooked on the printed circuit board 50 without measuring a separate insertion length, Can be improved.

At least one embossed portion 81b is formed at one end of the fixed extension portion 81, and the embossed portion 81b is formed with one of the concave or convex spherical surfaces facing upward. At this time, the embossed portion 81b may be formed in the longitudinal direction of the fixed extension portion 81 and may be arranged in multiple stages along the width direction. As a result, the area of the fixed extension portion 81 soldered to the printed circuit board 50 by the embossed portion 81b increases and can be firmly fixed.

At this time, the fixed extension part 81 extends to penetrate the spacing support member 60 at the other end, and the through hole fixing hole 61d is formed in the support plate part 61 so that the fixed extension part 81 passes through it. . The through-hole fixing hole 61d may be formed to have a width corresponding to a length of the fixed extension part 81. [

Here, a protrusion 61e may be formed on the inner surface of the through-hole fixing hole 61d so that the fixing extension portion 81 can be prevented.

At this time, the interval between the fitting protrusions 61e and the inward facing surfaces of the through-hole fixing holes 61d may be formed to correspond to the thickness of the fixed extension portion 81. [ Accordingly, the fixed extension portion 81 can be coupled to the through-hole fixing hole 61d without interference.

Here, when the fixed extension part 81 is inserted into the through-hole fixing hole 61d by interference fit, the contact area by the fitting protrusion 61e is reduced, and the fixing extension part 81 can be easily fitted.

The one end of the end portion is supported by the lower edge 61f of the through hole 61d so that the end of the end portion between the elastic piece fixing hole 55 and the through hole 61d The deformation due to the pressing force of the test switch 15 can be minimized and the durability of the product can be improved.

At this time, a stepped groove portion 61g may be formed in the through-hole fixing hole 61d so as to be stepped on the inner side facing the fitting protrusion 61e. As a result, the fixed extension portion 81 is further reduced in the contact area by the stepped groove portion 61g, and can be easily engaged.

The dispersion supporting portion 82 is formed integrally with the other end of the fixed extending portion 81. At this time, it is preferable that the dispersing and supporting part 82 is bent and extended upwardly from the other end of the fixed extension part 81. The dispersing and supporting part 82 provides an elastic restoring force corresponding to the pressing force of the test switch 15 applied to the contact extension part 84 and elastically supports the test switch 15.

Also, the dispersion supporting portion 82 may be bent upward to have an inclination angle of 20 to 30 degrees. Here, when the inclination angle of the dispersing and supporting portion 82 is less than 20, there is a fear that the elastic restoring force is reduced after being elastically deformed by the pressing force of the test switch 15. When the inclination angle of the dispersion supporting portion 82 exceeds 30 degrees, the contact extending portion 84 is elastically deformed at an excessive inclination angle so that the dispersion supporting portion 82 corresponds to the elastically deformed inclination angle, 85 may be separated from the test pin 70a.

As described above, even when the elastic contact piece 80 excessively acts on the test switch 15, the dispersing and supporting part 82 elastically supports the pressing force applied from the contact extending part 84, And the durability of the product can be further improved.

The support extension part 83 is connected to the dispersion support part 82 and extends integrally from the end of the dispersion support part 82. Here, the support extension part 83 is bent perpendicularly from the end of the dispersion support part 82 toward the upper side.

Accordingly, since the support extension 83 extends substantially perpendicularly to the direction of the pressing force applied by the test switch 15, the elastic deformation of the end portion except for the bent portion can be minimized. In addition, the support extension portion 83 may be elastically deformed in a bent portion of the dispersion support portion 82 so that the pressing force of the test switch 15 stably acts on the dispersion support portion 82.

At this time, the support extension portion 83 may extend to a length where the end portion is disposed above the upper end portion 63 of the support plate portion 61. Therefore, the contact extension portion 84 extending from the end of the support extension portion 83 can be disposed on the upper side of the support plate portion 61.

The contact extension part 84 is connected to the support extension part 83 and extends toward the test pin 70a. Specifically, the contact extension part 84 is integrally provided from the end of the support extension part 83 and is bent to be parallel to the fixed extension part 81 and extends toward the rear side.

At this time, it is preferable that the contact extension part 84 is disposed on the upper surface so that the lower end of the test switch 15, that is, the separation preventing part 15b is in contact with the upper part. In detail, the contact extension part 84 is elastically deformed by the pressing force of the test switch 15 and the bent part from the support extension part 83 is elastically deformed, and the terminal contact part 85 is deformed to the test pin 70a Can be contacted. In addition, the contact extension 84 may be extended to have a longer width than the diameter of the separation preventing portion 15b. Thus, the lower side of the release preventing portion 15b is entirely contacted with the contact extension portion 84, so that the pressing force applied from the test switch 15 can be stably transmitted.

If the release preventing portion 15b is disposed in contact with the upper surface of the contact extending portion 84 in a normal state in which the test switch 15 is not pressed, (80) so as to be disposed at a predetermined position. At this time, the test switch 15 is positioned at the position where the detachment preventing portion 15b is engaged with the lower edge of the switch insertion hole 16, and the test switch 15 is located outside the cover 10b As shown in FIG.

 Further, when the test switch 15 is pressed, the elastic contact pieces 80 are elastically deformed and the test pins 70a are contacted with the test pins 70a. Therefore, the test reliability is improved.

The contact extension 84 may have a length such that an end of the contact extension 84 faces the upper opening of the gap space 60a. Through this, the terminal contact portion 85 can be inserted inward through the open upper portion of the gap space 60a.

Meanwhile, the terminal contact portion 85 is integrally provided from the end of the contact extension portion 84 and extends perpendicularly to the downward direction. At this time, if the contact extension part 84 is elastically deformed downward according to the pressing force of the test switch 15, the terminal contact part 85 can be brought into contact with the outer surface of the test pin 70a.

At this time, the terminal contact portion 85 is vertically bent from the contact extension portion 84, so that the test pin 70a can be correctly positioned in a state where the elastic deformation is minimized corresponding to the direction of the pressing force applied from the test switch 15, The contact reliability can be improved.

When the test pin 70a and the elastic contact piece 180 are in contact with each other, the circuit unit 90 applies a test current to the fixing pin 33 to induce an overcurrent state in the image current transformer 30.

3A and 3B, when the test switch 15 is pressed downward, the end of the terminal contact portion 85 and the outer surface of the test pin 70a are in contact with each other.

The vertical distance h1 between the upper end of the spacing support member 60 and the contact extension 84 is greater than the vertical distance h2 between the end of the terminal contact portion 85 and the test pin 70a Preferably set. The upper end of the spacing support member 60 is substantially equivalent to the upper end 63 of the support plate 61.

Specifically, when the test switch 15 is pressed downward, each bent portion of the elastic contact piece 80 is elastically deformed so that the end of the terminal contact portion 85 and the test pin 70a are in contact with each other . At this time, when the end of the terminal contact portion 85 and the test pin 70a are in contact with each other, a predetermined clearance may be formed between the upper end portion 63 of the support plate portion 61 and the contact extension portion 84 have.

When the test switch 15 is pressed downward until the operation completion point where the test switch 15 is hooked on the engagement step 16a, the dispersion supporting portion 82 and the fixing extension 82 are rotated so that the inclination angle of the dispersion supporting portion 82 is reduced. The bent portion of the portion 81 is elastically deformed.

At this time, the contact extension portion 84 substantially corresponds to the reduced inclination angle of the dispersion supporting portion 82, and the end side connected to the support extension portion 83 is inclined downward through the predetermined clearance, do. One end of the contact extension part 84 may be supported on the upper edge 63a of the support plate part 61 in a state where the end of the terminal contact part 85 and the test pin 70a are in contact with each other . The contact extension part 84 may be bent by elastic deformation at one side of the contact extension part 84 that is in contact with the upper edge 63a of the support plate part 61. [

The vertical distance h1 between the upper end of the spacing support member 60 and the contact extension 84 exceeds the vertical distance h2 between the end of the terminal contact portion 85 and the test pin 70a The predetermined clearance that allows the contact extension 84 to be elastically deformed in an inclined manner may be formed.

The contact extension portion 84 is elastically deformed so as to be inclined to the upper edge 63a of the support plate portion 61 even when the contact portion 85 is kept in contact with the test pin 70a, The plastic deformation due to the pressing force of the test switch 15 is minimized and the durability of the product can be improved.

Since the one end of the fixed extension part 81 is fixed to the printed circuit board 50 and penetrates through the through hole 61d so that the pressing force of the test switch 15 is applied, And can be supported by the lower edge 61f of the through-hole fixing hole 61d.

The elastic contact piece 80 is elastically supported by the dispersing and supporting portion 82 while the fixed extension portion 81 and the contact extension portion 84 are engaged with the lower edge 61f of the through hole fixing hole 61d And the upper edge 63a of the support plate 61, respectively.

Accordingly, even when the test switch 15 is repeatedly pressed, the elastic contact piece 80 is minimally plastically deformed as it is multi-supported, so that durability and driving reliability of the product can be further improved.

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 these modifications fall within the scope of the present invention.

10: body part 20: trip switching part
30: Video current transformer 40: Solenoid part
50: printed circuit board 60: spacing support member
61: support plate portion 62: spacing side wall portion
70a: Test pin 70b: Fixed power pin
80: elastic contact piece 81: fixed extension part
82: dispersion supporting portion 83: support extension portion
84: contact extension part 85: terminal contact part
100: Earth leakage breaker

Claims (5)

A body portion having a power terminal portion and a load terminal portion provided on both sides thereof with a cover through which a pressure test switch passes,
A trip switching part mounted on the body part and having a trip driving part for switching a selective connection between the power terminal part and the load terminal part and a tripping part for tripping upon detecting a leakage current;
A video current transformer that is connected to the power terminal portion and the load terminal portion so as to detect a short circuit;
A solenoid unit including a bobbin wound with a coil to which driving power of a plunger for driving the trip driving unit is applied when a short circuit is detected in the video current transformer;
A printed circuit board having a circuit transformer coupled to a rear side of the solenoid unit and controlling the application of the driving power;
A spacing support member formed of an electrically insulating material so that a gap space is maintained between the rear surface of the solenoid portion and the front surface of the printed circuit board;
A test pin disposed inside the gap space through the printed circuit board; And
And a plurality of elastic contact pieces which are bent so as to be bent in a forward direction and penetrate through the spacing support member from one end fixed through the printed circuit board to be elastically contacted to the test pins in accordance with a pressing force of the test switch, ≪ / RTI >
Wherein the spacing support member comprises: a support plate portion having the solenoid portion coupled to the front surface thereof, the test pin being fixedly inserted into the support plate portion and having a through-hole; And a second side wall portion
Wherein the resilient contact piece has a fixed extension portion through which one end of the elastic contact piece is fixed through the printed circuit board while the other end of the resilient contact piece penetrates through the through hole and a dispersion supporting portion which is bent and extended upward from the other end of the fixed extension portion, A supporting extension portion connected to the dispersion supporting portion and extending vertically upward so that the end portion has a length longer than the upper end portion of the supporting plate portion; a supporting extension portion integrally connected to an end of the supporting extension portion, A contact extension portion extending in parallel to the fixed extension portion such that an end thereof faces an open upper side of the gap space toward a test pin side and an upper surface thereof is in contact with a lower end portion of the test switch; And a terminal contact portion which is bent and extended to be in contact with the test pin corresponding to a pressing force of the test switch, And including,
Wherein the vertical distance between the upper end of the support plate and the contact extension is set to exceed the vertical distance between the end of the terminal contact and the test pin. delete delete delete The method according to claim 1,
And a fixed power source pin disposed inside the gap space through the printed circuit board,
Wherein the coil has one end connected to the test pin and the other end connected to the fixed power supply pin, and the test pin and the fixed power supply pin are respectively electrically connected to the load terminal.

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