KR101651749B1 - Circuit breaker - Google Patents

Abstract

[PROBLEMS] A circuit breaker having a degree of adhesion equal to that of a screw type is obtained, while ensuring the assembling property, even if the terminal to which the electric wire is connected is a press-fit type as in the conventional case.
[MEANS FOR SOLVING PROBLEMS] A projecting portion is formed at a bent portion of an L-shaped connecting terminal interposed between a wire connected to the circuit breaker and fixed to the base by press fitting, the extending portion including a surface to which the electric wire is connected and an extended surface And the extending surface of the protruding portion is brought close to the tip end of the protruding portion protruding from the mating surface of the cover and the base to the base side.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker for wiring (wiring), a leakage circuit breaker and the like, and more particularly to an improvement of a terminal to which an external electric wire is connected.

For example, in order to prevent the electric wires and load devices from being burned out due to the overcurrent flowing through the electric wires from the transformer (load) to the load (load) device, It is known that a circuit breaker is disposed in the middle. To this end, the circuit breaker is provided with an electric circuit composed of an electric wire, that is, a terminal having a number of poles corresponding to a single phase, a three-phase phase, or a three-phase four- And is connected to the corresponding electric wire (referred to as an "external electric wire" when viewed from the circuit breaker, hereinafter referred to as "electric wire").

The connection between the circuit breaker and the electric wire includes, for example, a so-called quick connection method in which terminals are formed in a leaf spring shape and the contact pressure with the electric wire is maintained by the spring force, a plug-in system is known in which a conductor called a bus bar is connected to the conductor. On the other hand, in the case where a certain amount of current carrying capacity is required or the simplification of the construction is not so significant, it is preferable that a wire having a crimp terminal is provided on a washer or a wire- Or the wires themselves, and as a result, this method is widely known in general.

However, when a large number of such circuit breakers are installed in a distribution board or the like, there is a problem of "downsizing" of the distribution board itself due to the restriction of the installation space of the distribution boards, Miniaturization is required, and each maker also competes in miniaturization. On the other hand, on the other hand, the above-mentioned "prevention of burnout of electric wires and load devices", that is, an overcurrent detecting device, an opening / closing mechanism or a so- In order to improve the performance while accommodating, it is also necessary to pay attention to members that do not directly contribute to this performance improvement.

Here, as a method of disposing the above-described terminals on the case serving as an outer casing of the circuit breaker, by changing from the conventional screw type to the press-fit type, the space related to the screw type can be omitted, Or if the same performance is maintained, miniaturization of the outer periphery can be achieved (see, for example, Patent Document 1).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-21284 (column 3, right column (line 28) to column 49)

However, this terminal is noticed when an electric circuit installer or the like connects the electric wire, and its performance, that is, the degree of adhesion to the case can not be lowered. However, in order to obtain a degree of adhesion equivalent to that of the above-described screw type, even if punching such as lengthening of the indentation engaging portion is performed, the assembling property deteriorates only by increasing the indentation load on the case And it is conceivable that, in some cases, the case may be damaged by press-fitting.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a circuit breaker having a degree of close contact with a screw system, .

A circuit breaker according to the present invention includes a case made of a cover and a base formed of an insulator and a frame having an operating handle protruding from the cover and opposed to each other A movable contactor having a movable contact at least at one end thereof in cooperation with the crossbar, and a fixed contact which repeats contact and disengagement with the movable contact, A stationary contactor, an arc extinguishing device for cutting an arc generated between the two contacts, and a contactor interposed between the stationary contactor or the movable contactor and an electric wire connected to the circuit breaker, And an L-shaped connecting terminal fixed to the base by press-fitting, wherein a bent portion of the L-shaped connecting terminal is flush with the surface to which the electric wire is connected The surface of and at the same time, the projection maryeonham a projection made of, will from the abutment surfaces of the cover and the base so as to close to the tip ends of the projections projecting toward the base.

As described above, the present invention can provide a circuit breaker that is excellent in assemblability and low in cost and stable in quality even when an electric circuit installer or the like connects the electric wire to the terminal of the circuit breaker without lifting the terminal .

1 is an external perspective view of a circuit breaker according to Embodiment 1 of the present invention.
Fig. 2 is a view before the cover is attached in Fig. 1. Fig.
3 is a cross-sectional view taken along line A-A in Fig.
4 is an enlarged view of only the connection terminal in Fig.
Fig. 5 is a view corresponding to Fig. 2 showing a modified example.

Embodiment 1

1 and 2 show an appearance of a circuit breaker in a trip state according to the first embodiment of the present invention. More specifically, FIG. 1 shows a completed state, and FIG. 2 shows a state before a cover is attached. 3 is a sectional view taken along the line A-A in Fig. 1, and Fig. 4 is an external view of a connecting conductor serving as a recessed portion.

1 to 3, the insulating case of the circuit breaker 101 for three poles is constituted by a cover 1 and a base 2. Among them, the base 2 is provided with an operation handle 3 An opening and closing mechanism portion 51 and an extinguishing device 52 and an overcurrent tripping device 53 as many as the number of poles (three in this case) are disposed. Since the operation handle 3 protrudes from the window opening 1a of the handle 1 of the cover 1, it is well known that the operation handle 3 can be operated in the ON or OFF direction. From the positional relationship between the SOH apparatus 52 and the overcurrent tripping device 53, reference numeral 4 denotes a power supply side connection terminal connected to a power supply side wire, and 5 denotes a load side connection terminal connected to a load side wire (not shown) It is like a guide. When the respective wires are connected, the screw holes 4a and 5a of the respective connection terminals 4 and 5 are fastened with caulking terminals caulked to the ends of the wires or electric wires by screws provided with washers or the like. But the illustration of the screw is omitted.

Also, the opening / closing mechanism portion 51, the SOHO device 52, and the overcurrent tripping device 53 themselves are well known. That is, the circuit breaker 101 is provided with a fixed contact 7 extending from the power source side connection terminal 4 and having a fixed contact 6 at one end and a fixed contact 7 having a mover receiving portion 8 and an overcurrent tripping device 53 And is held by the crossbar 10, which is a resin molded product, for example, which is connected to the load side connection terminal 5 through the intermediary of the movable contact 9 and has one end constituting the opening / A movable contact 11 is provided. The contact between the stationary contact 7 and the movable contact 11 is repeated and an arc generated between the stationary contact 6 and the movable contact 9, Is cut by the SOH apparatus 52. Further, the opening / closing mechanism part is actuated by the operation in the OFF direction by the operation handle 3, or by the operation of the overcurrent tripping device 53 in accordance with the excess state of the electric circuit of the electric circuit Is done. In addition, since the circuit breaker 101 shown in Embodiment 1 is a so-called earth leakage breaker equipped with a known zero-phase current transformer 12 and a leakage current tripping device 54, the leakage current The above-mentioned gauze is also performed. Since these known devices and the like do not constitute a main part of the present invention, further explanation is omitted.

Hereinafter, each of the connection terminals, which is a substantial part of the present invention, will be specifically described as a load-side connection terminal 5 (hereinafter referred to as a terminal 5). As shown in Fig. 4, the terminals 5 are formed in an "L-shape" in an alphabetical outline, and on the first surface 5b corresponding to the L-shaped bottom, And a screw (not shown) is screwed into the screw hole 5a, thereby electrically connecting the electric wire and the terminal 5. [0051] As shown in Fig. The second and third short sides 5c and 5d of the long and short sections standing upright from the first surface 5b respectively have a pair of projected portions 5e protruding from these surfaces And the terminal 5 is inserted into the insertion groove 2a (see Fig. 3) provided on the base 2, so that the so-called press-fitting can be performed. The second surface 5c is also a weld surface between a conductor 13 passing through the frame current transformer 12 or a conductor (not shown) interposed between the conductor 13 and the fixed contact 7.

The surface of the L-shaped terminal 5 extending from the first surface 5b and having a flat surface (no step difference), that is, a surface extending from the first surface 5b is formed in the bent portion of the first surface 5b and the second surface 5c, A protruding portion 5f which is coplanar with the first surface 5b is waved. 2, the cover 1 is provided with a protruding portion 1b protruding from the mating surface of the cover 1 and the base 2 toward the base 2 side. As shown in Fig. 3, the protrusion 5b and the protrusion 1b are positioned so as to be close to the top and the top of the protrusion 5f. Therefore, it is possible to sufficiently secure the space for connecting the crimped terminal to the tip of the electric wire or the electric wire, that is, the first surface 5b, and also, by the electric circuit installer or the like, It is possible to prevent the terminal 5 from being lifted up, for example, when a screwdriver inserted into the tip of the screw is pulled out, or a load is applied to the wire under any circumstances. As a result, the insertion of the terminal 5 into the insertion groove 2a can be made into a press-fit state in consideration of the assembling property, and it is expected that the quality of the terminal 5 can be stabilized and the assembly cost can be reduced. The term " proximity " as used herein means that the protrusion 1b and the protrusion 5f interfere with each other when the cover 1 and the base 2 are engaged with each other, It means that the protruding portion 1b and the protruding portion 5f are opposed to each other so as not to interfere with each other. That is, it means that the protruding portion 1b and the protruding portion 5f face each other at a distance considering the dimensional tolerance of the protruding portion 1b. Of course, if the cover 1 does not interfere with the engagement between the cover 2 and the base 2, the projection 1b and the projection 5f may be in contact with each other.

3 or 4, the protruding portion 5f may be formed so as to have a protruding portion that protrudes from the second surface 5c, for example, as shown in Fig. 2 The insertion space of the leakage detection circuit 12a provided in the video current transformer 12 can be further secured. Although the protruding portion 1b is integrally formed with the cover 1 in the embodiment of the present invention, the protruding portion 1b may be formed as a separate member, that is, a barrier 14 as shown in Fig. 5, It is possible to make contact with the power source side connection terminal 4f, and more particularly, the effect can be exerted in combination with the power source side connection terminal 4 after designing for gas discharge in the arc cutting in the SOH apparatus 52. [ When the circuit breaker is disposed below the base 2 in the case where the protrusion 1b is provided as a separate member like the barrier 14, the protrusion 1b and the protrusion 1b 5f are in contact with each other. On the other hand, when the circuit breaker is provided in a direction in which the weight of the protruding portion 1b does not face the protruding portion 5f, the protruding portion 1b and the protruding portion 5f are not necessarily in contact with each other. That is, similarly to the case where the protrusion 1b is formed on the cover 1, the protrusion 1b (the barrier 14) and the protrusion 5f may be close to each other.

1 - cover 1b - protrusion
2 - Base 3 - Operating handle
4 - Current side connection terminal 5 - Load side connection terminal
5b - first surface 5c - second surface
5f - protrusion 6 - fixed contact
7 - fixed contact 9 - movable contact
10 - Crossbar 11 - Operational Contact
51 - opening / closing mechanism part 52 -
100 - Circuit breaker

Claims (3)

An opening / closing mechanism portion disposed between the frame plates facing each other and having an operation handle protruding from the cover; a crossbar rotatably coupled with the opening / closing mechanism portion; A stationary contactor having at least a movable contact having a movable contact at one end thereof and a stationary contact point repeatedly contacting and separating with the movable contactor and a stationary contactor having an arc extinguishing arc, And an L-shaped connection terminal interposed between the fixed contactor or the movable contactor and an electric wire connected to the circuit breaker and fixed to the base by press fitting,
Wherein protrusions are formed at the bent portions of the L-shaped connecting terminals, the protruding portions being formed of a flat surface extending from the surface to which the electric wires are connected, and the extending surfaces of the protrusions are connected to the base side Wherein the protruding protruding portion is in proximity to or in contact with the tip of the protruding protruding portion. The method according to claim 1,
Wherein the surface after the bending continuing from the surface to which the electric wire is connected and the tip end of the protrusion are the surface side. The method according to claim 1 or 2,
And the projecting portion is formed integrally with the cover.

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