TWI541851B - Circuit breaker - Google Patents

Description

Circuit interrupter

The present invention relates to a circuit interrupter such as a wiring breaker or a leakage breaker, and more particularly to an improvement of a terminal for connecting an external wire.

For example, in order to prevent the burning of the electric wire or the load machine due to the overcurrent flowing through the electric wire from the transformer to the load machine, it is known to arrange a circuit breaker in the middle of the electric wire to be laid. Therefore, the circuit breaker is provided with a circuit composed of an electric wire, that is, a terminal corresponding to a single-phase, a three-phase, or a three-phase four-wire or the like, and is connected to the electric wire (interrupted from the circuit) When the device is viewed, it becomes an "external wire", hereinafter referred to as "wire".

In the connection method of the circuit breaker and the electric wire, there is also known a so-called quick junction terminal method in which the terminal is formed in a leaf spring shape and the contact pressure with the electric wire is maintained by the spring force, or the electric wire is used as the A conductor called a bus bar that is connected to the conductor in a plug-in manner. On the other hand, when a certain amount of energization capacity is required or when construction is not required to be saved, the wire provided with the crimp terminal is connected by a washer or a crimp terminal of a screw provided in the terminal. or The wire itself, as a result, is widely known.

However, when a plurality of circuit breakers are disposed on a distribution board or the like, the space of the distribution board is limited, and the "slowing down" of the distribution board itself is required. Even the miniaturization of built-in circuit breakers, manufacturers are all competing for this miniaturization. On the other hand, in order to "prevent the burning of the electric wire or the load machine" as described above, that is, the arc extinguishing device for the overcurrent detection device or the opening and closing mechanism, or even the arc generated by the circuit interruption. When it is stored in the circuit breaker, it also enhances its performance. It should also focus on components that do not directly contribute to this performance improvement.

Therefore, it can be separately known that the method of disposing the aforementioned terminal to the frame as the outer periphery of the circuit breaker can be omitted by changing from the conventional screw method to the press-fitting method. The mode is related to the space, and the space is converted into performance improvement, or the size of the space is reduced (for example, refer to Patent Document 1).

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2000-21284 (page 3, right column, line 28 to line 49)

However, this terminal is a concern of those who are interested in connecting wires, such as industrials, and cannot reduce the performance, that is, cannot reduce the frame. The degree of closeness. However, in order to obtain the same degree of adhesion as the above-described screw method, for example, even if a detailed operation such as lengthening the press-fitting portion is performed, the assembly property is deteriorated as long as the load pressed into the frame increases, depending on the situation. Unlike the case, there is a possibility that the frame is broken due to press-fitting.

The present invention has been made in view of the above problems, and an object of the present invention is to obtain a circuit interrupter which can ensure the assemblability of the terminal even if the terminal for connecting the electric wires is the same press-fit method as that of the prior art. The same level of tightness as the screw method.

The circuit breaker of the present invention includes a housing formed of a cover and a base formed of an insulator, and an opening and closing mechanism portion having an operation handle protruding from the cover. Arranging between frame plates facing each other; a crossbar rotating in conjunction with the opening and closing mechanism portion; the movable contactor being interlocked with the cross bar and having a movable contact at at least one end The fixed contactor has a fixed contact that is separated from and separated from the movable contact; the arc extinguishing device is configured to cut off an arc generated between the two contacts; and the L-shaped connecting terminal is disposed in the fixed contact And the movable contactor and the electric wire connected to the circuit breaker, and are fixed by being pressed into the base; and the curved portion of the L-shaped connecting terminal is provided with a surface connected to the electric wire The protrusion formed by the flush surface and the surface of the protrusion is close to the front end of the protrusion from the abutting surface of the cover and the base to the base side.

As described above, the present invention can provide a circuit breaker which is excellent in assemblability and inexpensive, and which is stable in quality when a circuit manufacturer or the like connects a wire to a terminal of the circuit breaker.

1‧‧‧ Cover

1a‧‧‧Handle with window

1b‧‧‧Protruding

2‧‧‧Base

2a‧‧‧ Insert slot

3‧‧‧Operation handle

4‧‧‧current side connection terminal

4a‧‧‧ screw holes

5‧‧‧Load side connection terminal

5a‧‧‧ screw holes

5b‧‧‧1st

5c‧‧‧2nd

5d‧‧‧3rd

5e‧‧‧protrusion

5f‧‧‧prominence

6‧‧‧Fixed joints

7‧‧‧Fixed contactors

8‧‧‧Actuator Acceptance Department

9‧‧‧ movable contact

10‧‧‧cross bar

11‧‧‧ movable contactor

12‧‧‧zero phase converter

12a‧‧‧Leakage detection circuit

13‧‧‧Conductor

14‧‧‧Disability Department

51‧‧‧Opening and Closing Department

52‧‧‧Arc extinguishing device

53‧‧‧Overcurrent trip device

54‧‧‧Leakage tripping device

100, 101‧‧‧ circuit breaker

Fig. 1 is a perspective view showing the appearance of a circuit breaker according to a first embodiment of the present invention.

Fig. 2 is a view before the cover of Fig. 1 is assembled.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 1.

Fig. 4 is an enlarged view of only the connection terminal in Fig. 1.

Fig. 5 shows a modification corresponding to Fig. 2 .

(Embodiment 1)

Fig. 1 and Fig. 2 are views showing the appearance of a circuit breaker in a trip state in the first embodiment of the present invention. In detail, the first figure is a completed state, and the second figure is a cover assembly. The previous state. Further, Fig. 3 shows a cross section taken along line A-A of Fig. 1, and Fig. 4 shows an appearance of a connecting conductor which is a main portion.

In the first to third embodiments, the insulating frame system of the circuit breaker 101 for three poles is composed of a cover 1 and a base 2, and an opening and closing mechanism portion 51 having an operation handle 3 and a number of poles are disposed on the base 2 The arc extinguishing device 52 (three in this case) and the overcurrent tripping device 53 are provided. As is well known, the operation handle 3 protrudes from the handle opening 1a of the cover 1, and thus can be operated in the ON or OFF direction. In addition, the arc extinguishing device 52 is tripped from the overcurrent The positional relationship of the device 53 is also known. 4 is a power source side connection terminal connected to a power source side electric wire (not shown), and 5 is a load side connection terminal connected to a load side electric wire (not shown). Further, when the respective electric wires are connected, the electric wire or the crimping terminal that is swaged to the tip end of the electric wire is locked to the screw holes 4a and 5a of the respective connection terminals 4 and 5 by a screw provided with a washer or the like, but the screw pattern is attached. The system is omitted.

Further, the opening and closing mechanism portion 51, the arc extinguishing device 52, and the overcurrent trip device 53 themselves are also well known. That is, the circuit breaker 101 is provided with a fixed contactor 7 extending from the power supply side connection terminal 4 and having a fixed contact 6 at one end, and a movable contactor 11 passing through the actuator receiving portion. 8 and the overcurrent trip device 53 are connected to the load side connection terminal 5, and have a movable contact 9 at one end, and are held by a cross bar 10 of a resin molded article constituting one of the members of the opening and closing mechanism portion 51. The arc is repeatedly contacted between the fixed contactor 7 and the movable contactor 11, and the arc generated between the fixed contact 6 and the movable contact 9 is interrupted by the arc extinguishing means 52, particularly by opening. Further, the disconnection is performed by operating the handle 3 in the OFF direction or the overcurrent tripping device 53 according to the operation of the current exceeding the state of the circuit, thereby causing the opening and closing mechanism to operate in response to the operation. Further, the circuit breaker 101 shown in the first embodiment is provided with a so-called leakage current interrupter of the conventional zero-phase current transformer 12 and the leakage current tripping device 54, so that even if the leakage current of the current becomes predetermined When the value is more than or equal to the above, the aforementioned disconnection can also be performed. The above-described conventional devices and the like do not constitute a substantial part of the present invention, and detailed descriptions thereof will be omitted.

The following is the connection terminal for the main part of the present invention In particular, the load side connection terminal 5 will be described (hereinafter referred to as terminal 5). As shown in Fig. 4, the outer shape of the terminal 5 is substantially formed in an "L" shape of an English letter, and a crimping terminal which is fastened to the first surface 5b corresponding to the bottom surface of the L-shaped surface is crimped to the tip end of the electric wire. A screw (not shown) is locked to the screw hole 5a to form an electrical connection between the wire and the terminal 5. Further, the second surface 5c and the third surface 5d having different lengths which are erected from the first surface 5b each have a pair of protruding portions 5e which are expanded from the surfaces, and the terminal 5 is inserted into the base 2 The groove 2a is inserted (refer to Fig. 3), and the so-called press-fit mounting is completed. Further, the second surface 5c is also a welded surface of the conductor 13 that penetrates the zero-phase current transformer 12 or a conductor (not shown) that is interposed between the fixed contactor 7.

In the curved portion of the first surface 5b and the second surface 5c of the L-shaped terminal 5, a surface that is extended from the first surface 5b and is flush, that is, flush with the first surface 5b is provided. The protrusion 5f of the surface. On the other hand, as can be seen from Fig. 2, the cover 1 is provided with a projection 1b projecting from the abutting surface of the cover 1 and the base 2 to the base 2 side. Both of the projections 5f and the projections 1b are arranged as shown in Fig. 3, and the projections 1b are disposed on the upper surface of the projections 5f and close to the projections 5f. Therefore, it is possible to sufficiently secure the space for connecting the electric wire or the crimp terminal which is riveted to the front end of the electric wire, that is, the first surface 5b, and the electric appliance manufacturer or the like locks the electric wire to the terminal 5, for example, to be inserted into the front end of the screw. When the screwdriver is pulled out, or when a load is applied to the wire for some reason, the detachment of the terminal 5 can be prevented in advance. As a result, the insertion of the terminal 5 into the insertion groove 2a can be a press-fit state in consideration of assemblability, and not only the quality is stabilized, but also the assembly cost can be expected to be greatly reduced. The so-called proximity refers to the embedding of the cover 1 and the base 2 At the same time, the protruding portion 1b and the protruding portion 5f are opposed to each other so as not to interfere with the fitting of the cover 1 and the base 2 by the interference between the protruding portion 1b and the protruding portion 5f. That is, the protruding portion 1b is opposed to the protruding portion 5f by a distance that takes into consideration the dimensional tolerance of the protruding portion 1b. Of course, as long as the fitting of the cover 1 and the base 2 is not disturbed, the protruding portion 1b may be in contact with the protruding portion 5f.

Further, as shown in Fig. 3 or Fig. 4, the projection 5f can be further secured as long as the front end thereof is flush with the second surface 5c, that is, without protruding from the second surface 5c. The insertion space of the leakage detecting circuit 12a provided in the zero-phase current transformer 12 is preferable. Further, in the embodiment of the present invention, the protruding portion 1b is integrally formed with the cover 1, but as shown in Fig. 5, the protruding portion 1b may be used as a barrier member 14 to contact the protruding portion. 5f, in particular, after the countermeasure of interrupting the gas discharge in the arc by the arc extinguishing device 52 is performed, the effect can be further enhanced by the combination with the power source side connecting terminal 4. When the barrier portion 14 is provided with the protruding portion 1b as another member, when the circuit breaker is disposed with the substrate 2 below, the protruding portion 1b and the protruding portion 5f are in contact with each other by the weight of the protruding portion 1b. On the other hand, when the circuit breaker is provided in the direction in which the weight of the protruding portion 1b is not directed toward the protruding portion 5f side, the protruding portion 1b and the protruding portion 5f are not necessarily in contact with each other. That is, as in the case where the protruding portion 1b is formed in the cover 1, the protruding portion 1b (barrier portion 14) and the protruding portion 5f are only required to be close to each other.

1b‧‧‧Protruding

2a‧‧‧ Insert slot

4‧‧‧current side connection terminal

4a‧‧‧ screw holes

5‧‧‧Load side connection terminal

6‧‧‧Fixed joints

7‧‧‧Fixed contactors

8‧‧‧Actuator Acceptance Department

9‧‧‧ movable contact

10‧‧‧cross bar

11‧‧‧ movable contactor

13‧‧‧Conductor

Claims (3)

A circuit breaker comprising: a frame formed of a cover and an insulator formed of an insulator; and an opening and closing mechanism portion having an operation handle protruding from the cover and disposed on a frame plate facing each other a crossbar that rotates in conjunction with the opening and closing mechanism portion; the movable contactor is coupled to the crossbar and has a movable contact at at least one end; and the fixed contactor has a fixed contact with the movable contact. a contact arc; an arc extinguishing device for intercepting an arc generated between the two contacts; and an L-shaped connecting terminal disposed between the fixed contactor or the movable contactor and the wire connected to the circuit interrupter And being fixed by press-fitting the base; and a protruding portion formed by an extended surface flush with a surface to which the electric wire is connected is provided in a bent portion of the L-shaped connecting terminal, and the protruding portion is The extended surface is close to or in contact with the front end of the protruding portion that protrudes from the abutting surface of the cover and the substrate to the base side. The circuit breaker according to claim 1, wherein the curved surface continuous from the surface on which the electric wire is connected is flush with the front end of the protruding portion. The circuit breaker according to claim 1 or 2, wherein the protruding portion is integrally formed with the cover.