JP2023127921A - Terminal cover - Google Patents

Abstract

To suppress leakage of generated arc gas.SOLUTION: A terminal cover 30 has a two-part structure consisting of a pair of first cover component 31 and second cover component 32, and covers a load side terminal 11 to which electric wires 12 and 13 are connected. The first cover component 31 and the second cover component 32 are configured such that openings of notches (48A, etc.) formed in the respective electric wires 12, 13 to allow the electric wires 12, 13 to pass therethrough face each other, and at least the tip portions 361 and 362 of both side walls 36A and 36B in the width direction are arranged so as to overlap each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a terminal cover that covers a terminal to which an electric wire is connected.

A circuit breaker is installed in a power distribution board or the like, and connects and disconnects terminals on the power supply side and terminals on the load side. It is desirable that the area around the terminal be covered with a cover to prevent foreign objects, tools, fingers, etc. (hereinafter also referred to as foreign objects) from entering. Although the cover is provided with a notch for the electric wire to pass through, it is desirable that the gap between the notch and the electric wire be sufficiently narrow to prevent foreign objects from entering.

The terminal cover described in Patent Document 1 has a two-part structure including a first cover part in which a U-shaped cutout groove for passing electric wires is formed in the end face, and a second cover part that pairs with the first cover part. Since the open end of the cutout groove formed in the first cover part is closed by the second cover part, the gap between the electric wire and the electric wire can be narrowed.

Japanese Patent Application Publication No. 2000-067728

By the way, in the above-mentioned terminal cover, since the both widthwise walls of the first cover part and the widthwise both walls of the second cover part abut each other, arc gas is generated when the short circuit current is interrupted by the circuit breaker. When this occurs, the arc gas causes both side walls of the first cover part and both side walls of the second cover part to bend, and there is a risk that the arc gas may leak. Such leakage of arc gas is undesirable because it induces arc gas to enter around the terminals of circuit breakers adjacent to each other in the width direction, causing a short circuit between phases.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a terminal cover that can suppress leakage of generated arc gas.

In order to achieve the above object, the terminal cover according to the present invention has a two-part structure consisting of a pair of first cover component parts and second cover component parts, and has a terminal cover for covering a terminal to which an electric wire is connected. In the cover, the first cover component and the second cover component have cutout openings formed in each of the first cover component and the second cover component facing each other to allow the electric wire to pass therethrough, and the first cover component and the second cover component include at least one of both widthwise side walls. It is characterized in that the tips are arranged so that they overlap each other.

The present invention also provides the above-mentioned terminal cover, in which a tip end of one of both side walls of the first cover component and the second cover component has an outer portion smaller than an inner portion of the first cover component and the second cover component. A step is formed by protruding toward the other side of the cover component, and the tips of the other side walls of the first cover component and the second cover component have an inner portion that is larger than the outer portion of the first cover component. A step is formed by protruding toward one of the cover component and the second cover component, and the first cover component and the second cover component are located at the outer portion at the tip of one side wall are arranged so as to overlap the inner portions at the tips of the other side walls.

Further, in the above terminal cover, the present invention provides that the first cover component and the second cover component have a step at a tip end of the both side walls in an extending direction of the both side walls perpendicular to the width direction. It is characterized by being formed in different positions.

Further, the present invention is characterized in that in the terminal cover, the terminal is a terminal of a circuit breaker.

According to the present invention, the first cover component and the second cover component, which have a two-part structure, are configured such that the openings of the notches formed in each of them for passing the electric wires face each other, and Since the walls are arranged so that at least the tips thereof overlap each other, the strength of both side walls can be improved, and even if arc gas is generated, the arc gas will cause the both side walls of the first cover part and the second cover part to be damaged. It is possible to prevent the both side walls of the arc from bending, and the leakage of generated arc gas can be suppressed.

FIG. 1 is a perspective view showing a circuit breaker to which a terminal cover according to an embodiment of the present invention is applied. FIG. 2 is an exploded perspective view of the circuit breaker shown in FIG. 1 with some components removed. FIG. 3 is an exploded perspective view of the circuit breaker shown in FIG. 1 with some components removed. FIG. 4 is a perspective view showing an example of how the circuit breaker shown in FIG. 1 is used. FIG. 5 is a perspective view showing a state in which electric wires and busbars are connected to the circuit breaker shown in FIG. 1. FIG. 6 is an enlarged front view of a part of the terminal cover. FIG. 7 is a front view showing a case where the terminal covers shown in FIGS. 1 to 3 are arranged in parallel. FIG. 8 is an exploded perspective view of a circuit breaker to which a modified example of the terminal cover according to the embodiment of the present invention is applied, with some components removed. FIG. 9 is a front view showing a case where the terminal covers shown in FIG. 8 are arranged in parallel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a terminal cover according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a circuit breaker to which a terminal cover according to an embodiment of the present invention is applied, and FIGS. 2 and 3 show some components of the circuit breaker shown in FIG. 1, respectively. It is an exploded perspective view shown in a state where it is removed.

The circuit breaker 1 illustrated here is, for example, a hardwired circuit breaker or an earth leakage circuit breaker, which detects the flow of a large current and automatically interrupts an electric path. More specifically, the circuit breaker 1 connects and disconnects a power supply side terminal (not shown) and a load side terminal 11 (not shown). Moreover, as shown in FIG. 4, the circuit breaker 1 is used by being arranged side by side with other circuit breakers 1 so as to be adjacent to each other.

In the following, one circuit breaker 1 will be explained, and the side where the load-side terminal 11 is provided is referred to as the lower side, the opposite side is referred to as the upper side, and the operating surface side where the lever L is provided is referred to as the front side. The opposite side will be referred to as the back side, and the direction perpendicular to the up-down direction and the front-back direction, that is, the width direction of the circuit breaker 1, will be referred to as the left-right direction.

In addition to the lever L, the operation surface is provided with a trip button T and the like. In each figure, directions are indicated by arrows as appropriate, but the notations indicating these directions are for convenience of explanation, and the mounting direction of the circuit breaker 1 is not limited.

The circuit breaker 1 includes an arc extinguishing device, an opening/closing mechanism, a tripping mechanism, etc. inside a circuit breaker body 20 covered with a front cover 20a and a back cover 20b. Three load-side terminals 11 are provided in parallel on the left and right in the lower part of the back cover 20b.

Here, the circuit breaker 1 has a three-phase specification and is provided with three load-side terminals 11, but in the present invention, it may be of a one-terminal type, a two-terminal type, or a four-terminal type. . The three load-side terminals 11 are covered with a terminal cover 30.

Three power supply side terminals are provided in parallel on the left and right in the upper part of the back cover 20b. These power supply side terminals may also be covered by the terminal cover 30. The back cover 20b has a mounting portion 21 formed on the back surface thereof, which can be attached to, for example, a predetermined rail on a power distribution board.

As shown in FIGS. 2 and 3, each load-side terminal 11 is provided in an area defined by a pair of side walls 22 on both sides and an intermediate wall 23 between the load-side terminals 11. As shown in FIGS. The side wall portion 22 is continuously formed from the back cover 20b to the front cover 20a. The load-side terminal 11 is of a screw type and includes a pedestal portion 11a and a screw 11b screwed into a screw hole of the pedestal portion 11a.

The screw 11b is screwed in toward the back side and pulled out toward the front side. The load side terminal 11 may be of a screw-up type or a spring type. The load-side terminal 11 fixes and conducts electric wires using the pedestal portion 11a and the head portion of the screw 11b.

As shown in FIG. 5, a thick electric wire 12, a thin electric wire 13 having a smaller outer diameter than the thick electric wire 12, a bus bar 14, etc. can be fixed to each load side terminal 11 according to predetermined allowable specifications. Further, regarding the thin electric wires 13, it is also possible to stack a plurality of wires (two wires in the example of FIG. 5) together in the front and back directions and fix them together. The fixed electric wires 12 and 13 extend in the vertical direction near the load-side terminal 11.

Next, the terminal cover 30 will be explained. The terminal cover 30 covers the three load-side terminals 11 and has a two-part structure including a first cover component 31 and a second cover component 32. The first cover component 31 and the second cover component 32 are resin molded products and have insulation properties. The gaps between the various parts of the terminal cover 30 are sufficiently narrow to prevent foreign objects from entering, thereby protecting the load-side terminals 11. The protection level of the terminal cover 30 is, for example, equivalent to IP20 specified in JIS C 0920.

The first cover component 31 and the second cover component 32 are used in combination with each other. The first cover component 31 covers the front side portion and the lower portion near the front side with the load side terminal 11 as a reference. The second cover component 32 covers the back side portion and the lower portion near the back side with respect to the load side terminal 11 as a reference.

In the following explanation, in order to make it easy to understand, the reference numerals of the components of the first cover component 31 will be given an "A" as appropriate, and the reference numerals of the corresponding components of the second cover component 32 will be appended with "A" as appropriate. ``B'' shall be added as appropriate. In the description of the terminal cover 30 alone, the "front" of the terminal cover 30 is defined as the lower surface in FIGS. 1 to 3.

The first cover component 31 includes a front wall 34, a pair of left and right side walls 36A, a pair of middle partition walls 38A, and a front section 40A.

The front wall 34 is for collectively covering the front sides of the three load-side terminals 11 (in other words, the direction in which the screws 11b come out). The front wall 34 is provided with operation holes 34a at positions corresponding to the three load-side terminals 11, and is also provided with a snap-fit portion 34b.

The operation hole 34a is a circular through hole that allows a rod-shaped instrument such as a voltage detector or a screwdriver to be inserted and abuts a part of the load-side terminal 11, while allowing the rod-shaped instrument to come into contact with the head of the screw 11b. It has a function to guide you so that it is in the proper direction of contact. By inserting a rod-shaped instrument through these operation holes 34a and abutting a part of the load-side terminal 11, operations such as voltage detection and retightening are possible.

Such an operation hole 34a prevents a rod-like device from coming into contact with the mounting screw that attaches the external operation handle device to the circuit breaker 1 when the external operation handle device is attached to the surface of the circuit breaker 1. It has a function to prevent ground faults and electric shocks to workers when electricity is applied. The snap fit portion 34b is an attachment portion to the circuit breaker main body 20.

The pair of left and right side walls 36A each form an extension surface of the side wall portion 22, and serve to separate the external area from the load-side terminal 11. These side walls 36A extend toward the back side from both left and right ends of the front wall 34, and the left side wall 36A extends further toward the back side than the right side wall 36A. Here, in the pair of left and right side walls 36A, the direction in which they approach each other will be referred to as the inside, and the direction in which they will be separated from each other will be referred to as the outside.

The extending end portions on the back side of these side walls 36A constitute a tip portion 361, and at the tip portion 361, an outer portion 361a protrudes toward the back side than an inner portion 361b, forming a step 361c.

In other words, in the both side walls 36A, at each tip 361, the outer portion 361a protrudes toward the back side than the inner portion 361b, forming a step 361c, and in the extending direction (front and back direction) of the both side walls 36A. Steps 361c are formed at different positions.

The intermediate partition wall 38A forms an extension surface of the intermediate partition wall portion 23, and serves to separate the load-side terminals 11 from each other. A protrusion 381 that protrudes toward the back side is formed at the back end of the middle partition wall 38A.

The front portion 40A is a portion connected to the front wall 34 on the front side and connected to the side walls 36A on both sides, and has three wire diameter adjustment portions 42A provided corresponding to each load side terminal 11. . The three wire diameter adjustment sections 42A are arranged in parallel corresponding to the arrangement of the load side terminals 11. The portion of the front portion 40A other than the wire diameter adjustment portion 42A forms an outer frame 44A.

The terminal cover 30 has an insertion portion 46 (see FIGS. 1 and 5) through which the electric wires 12 and 13 are inserted. The insertion portions 46 are provided individually for the three load-side terminals 11, and are provided so as to be able to face each of the load-side terminals 11. The wire diameter adjustment portion 42A is a portion that adjusts the area of the insertion portion 46 according to the diameter and number of the wires 12 and 13 connected to the load side terminal 11.

FIG. 6 is an enlarged front view of a part of the terminal cover 30. As shown in FIG. As shown in FIG. 6, the wire diameter adjustment section 42A in the first cover component 31 has an outer frame cutout 48A formed in the outer frame 44A and a first inner frame 50A provided inside the outer frame cutout 48A. , a first inner frame cutout 52A formed in the first inner frame 50A, a second inner frame 54A provided inside the first inner frame cutout 52A, and a second inner frame formed in the second inner frame 54A. It has a frame cutout 56A, a third inner frame 58A provided inside the second inner frame cutout 56A, and a third inner frame cutout 60A formed in the third inner frame 58A.

A fin 62 is provided between the outermost part of the outer frame notch 48A and the outer frame 44A. The fin 62 is a part on which a finger is placed when removing the first cover component 31 from the circuit breaker main body 20.

The first inner frame 50A, the second inner frame 54A, and the third inner frame 58A are each U-shaped. The first inner frame 50A, the second inner frame 54A, and the third inner frame 58A are made smaller in this order, and have substantially similar shapes and have a so-called nested structure.

The gaps between the outer frame 44A and the first inner frame 50A, the gaps between the first inner frame 50A and the second inner frame 54A, and the gaps between the second inner frame 54A and the third inner frame 58A have approximately the same width. It is narrow enough to prevent foreign objects from entering.

The outer frame notch 48A, the first inner frame notch 52A, the second inner frame notch 56A, and the third inner frame notch 60A have substantially similar U-shapes, and are open on the back side. The outer frame notch 48A, the first inner frame notch 52A, the second inner frame notch 56A, and the third inner frame notch 60A are smaller in this order.

The first inner frame 50A has a pair of opening connection pieces 64A provided at both ends of the outer frame notch 48A on the opening side (back side in FIG. 6) with respect to the outer frame 44A, and a back side connection at the innermost part. It is connected to the piece 66A at three places, and has an appropriate connection strength and is stable.

The opening connecting piece 64A is provided at a position slightly recessed from the opening side end of the outer frame notch 48A to form a gap. The sides of the gap are cut short so that the cutting force can be used to cut the gap using a cutting tool, which will be described later. The first inner frame 50A is connected to the outer frame 44A via the fin 62 by the innermost connecting piece 66A at the innermost part.

The opening connection piece 64A and the back side connection piece 66A have portions that can be cut with a cutting tool that does not require power, such as nippers or a cutter. When such a portion is cut, the first inner frame 50A is separated from the outer frame 44A.

The first inner frame 50A and the second inner frame 54A are also connected in the same way as the outer frame 44A and the first inner frame 50A are connected. . That is, the second inner frame 54A is connected to the first inner frame 50A at three locations: a pair of opening connection pieces 68A on the opening side of the first inner frame notch 52A, and the innermost connection piece 70A. connected with. The third inner frame 58A is connected to the second inner frame 54A at three places: a pair of opening connection pieces 72A on the opening side of the second inner frame notch 56A, and a back side connection piece 74A at the innermost part. It is connected.

The opening connecting piece 68A, the back connecting piece 70A, the opening connecting piece 72A, and the back connecting piece 74A have portions that can be cut with a cutting tool.

Next, the second cover component 32 will be explained. As shown in FIGS. 2 and 3, the second cover component 32 includes a back wall 35, a pair of left and right side walls 36B, a pair of intermediate walls 38B, and a front section 40B.

The back wall 35 is for collectively covering the back sides of the three load-side terminals 11. Although not clearly shown in the figure, a cutout wall is formed on the back side of each of the three screws 11b on the back wall 35, and the busbar 14 is inserted from the place where the cutout wall is cut out using a cutting tool or the like to carry out the load. It can be connected to the side terminal 11. Since the bus bar 14 is generally provided so as to extend on the back side of the circuit breaker 1 in the distribution board, the connection can be made by making it possible to insert it from a cutout part of the back wall 35. It becomes easier. At least a portion of the back wall 35 is preferably formed as a cutout wall depending on the cross-sectional area of the conductive material such as the bus bar 14 to which connection is expected.

The left and right pair of side walls 36B each form an extension surface of the side wall portion 22, and serve to separate the external region from the load-side terminal 11. These side walls 36B extend toward the front side from both left and right ends of the back wall 35, and the right side wall 36B extends further toward the front side than the left side wall 36B. Here, in the pair of left and right side walls 36B, similarly to the side walls 36A constituting the first cover component 31 described above, the direction in which they approach each other is referred to as the inside, and the direction in which they are separated from each other is referred to as the outside.

The extending ends on the front side of these side walls 36B form a tip 362, and at the tip 362, an inner portion 362b protrudes more toward the front than the outer portion 362a, forming a step 362c.

That is, in the both side walls 36B, the inner part 362b of each tip 362 protrudes toward the front side than the outer part 362a, forming a step 362c, and in the extending direction (front and back direction) of the both side walls 36B. Steps 362c are formed at different positions.

The middle partition wall 38B partially overlaps with the middle partition wall 38A to form an extension surface of the middle partition wall portion 23, and is for separating the load-side terminals 11 from each other. A recess 382 that can accommodate the projection 381 is formed at the front end of the middle partition wall 38B.

The front part 40B is a part whose back side is connected to the back wall 35 and both sides are connected to the side walls 36B, and has three wire diameter adjustment parts 42B provided corresponding to each load side terminal 11. . The three wire diameter adjustment parts 42B are arranged in parallel corresponding to the arrangement of the load side terminals 11. The portion of the front portion 40B other than the wire diameter adjustment portion 42B forms an outer frame 44B.

As shown in FIG. 6, the electric wire diameter adjusting section 42B is basically symmetrical with respect to the electric wire diameter adjusting section 42B except for the details. The components of the wire diameter adjustment section 42B are marked with "B" instead of "A" for the components of the above-mentioned wire diameter adjustment section 42B, so that the correspondence can be identified. Detailed explanations of each will be omitted.

In such a first cover component 31 and second cover component 32, a protrusion 381 formed at the back end of the middle partition wall 38A is inserted into a recess 382 formed at the front end of the corresponding middle partition wall 38B. The outer portion 361a of the tip 361 of the left side wall 36A overlaps the inner portion 362b of the tip 362 of the left side wall 36B, and the outer portion 361a of the tip 361 of the right side wall 36A overlaps with the inner portion 362b of the tip 362 of the left side wall 36B. The terminal cover 30 is formed by overlapping the inner portion 362b of the tip 362 of the side wall 36B.

In this case, in the initial state in which none of the first inner frames 50A, 50B, second inner frames 54A, 54B, and third inner frames 58A, 58B are cut out, the innermost third inner frame notches 60A, 60B The openings thereof face each other to form the insertion part 46, and the back end surface of the outer portion 361a at the tip 361 of the left side wall 36A is the front end surface of the outer portion 362a at the tip 362 of the left side wall 36B. The back end surface of the outer portion 361a at the tip 361 of the right side wall 36A is in contact with the front end surface of the outer portion 362a at the tip 362 of the right side wall 36B.

In other words, the terminal cover 30 has a two-part structure consisting of a pair of first cover component 31 and second cover component 32, and the first cover component 31 and second cover component 32 are each formed separately. The end portions 361 and 362 of both side walls 36A and 36B in the width direction are arranged so as to overlap each other, with the openings of the notches facing each other.

Then, depending on the diameter of the electric wires 12 and 13 connected to the load side terminal 11, an insertion portion 46 slightly larger than the diameter of the electric wires 12 and 13 is formed by the opening of the notch. By cutting the corresponding portions of each connection piece, the terminal cover 30 allows the electric wires 12 and 13 to be inserted through the insertion portion 46. Thereby, the gap between the electric wires 12, 13 and the insertion portion 46 can be sufficiently narrowed, and it is possible to suppress the entry of foreign objects and the like.

As explained above, according to the terminal cover 30 according to the embodiment of the present invention, the first cover component 31 and the second cover component 32 are formed respectively to allow the electric wires 12 and 13 to pass therethrough. Since the openings of the notches are arranged so as to face each other and the tips 361 and 362 of the side walls 36A and 36B in the width direction overlap each other, the strength of the side walls 36A and 36B can be improved. can. This prevents both side walls 36A of the first cover component 31 and both sides walls 36B of the second cover component 32 from being bent by the arc gas even if arc gas is generated when the circuit breaker 1 interrupts a short circuit current. This can be prevented and the leakage of generated arc gas can be suppressed.

According to the terminal cover 30, the outer portion 361a of the step 361c formed at the tip 361 of the both side walls 36A of the first cover component 31 is formed at the tip 362 of the both side walls 36B of the second cover component 32. Since the terminal cover 30 is arranged so as to overlap the inner portion 362b of the step 362c, it is possible to suppress an increase in the thickness of the mutually overlapping portion, and it is possible to suppress an increase in the size of the terminal cover 30 itself.

Further, according to the terminal cover 30, the steps 361c and 362c are formed at different positions in the extending direction (front and back direction) of both side walls 36A and 36B of the first cover component 31 and the second cover component 32. As shown in FIG. 7, when the circuit breakers 1 are arranged in parallel on the left and right, and the terminal covers 30 are also arranged in parallel on the left and right in contact with other terminal covers 30, the outside of the first cover component 31 The portion 361a comes into contact with a portion of the first cover component 31 of another terminal cover 30 that has a sufficient thickness on the base end side (front side) than the step 361c, and the both side walls 36A including the outer portion 361a , 36B can be prevented from bending. This prevents arc gas from entering other terminal covers 30, and there is no risk of short circuiting between phases.

FIG. 8 is an exploded perspective view of a circuit breaker 1a to which a modification of the terminal cover 30 according to the embodiment of the present invention is applied, with some components removed. Note that the same components as those of the terminal cover 30 and the circuit breaker 1 including the terminal cover 30 according to the embodiment described above are given the same reference numerals and redundant explanations will be omitted as appropriate.

The terminal cover 30a illustrated here has a two-part structure including a first cover component 31a and a second cover component 32a. The first cover component 31a and the second cover component 32a are resin molded products and have insulation properties. The gaps between the various parts of the terminal cover 30a are narrow enough to prevent foreign objects from entering, thereby protecting the load-side terminals 11. The protection level of the terminal cover 30a is equivalent to IP20 specified by JIS C 0920, for example.

The first cover component 31a and the second cover component 32a are used in combination with each other. The first cover component 31a covers the front side portion and the lower portion near the front side with respect to the load side terminal 11 as a reference. The second cover component 32a covers the back side portion and the lower portion near the back side with respect to the load side terminal 11 as a reference.

The first cover component 31a includes a front wall 34, a pair of left and right side walls 36A', a pair of middle partition walls 38A, and a front section 40A. The pair of left and right side walls 36A' each form an extension surface of the side wall portion 22, and serve to separate the external area from the load-side terminal 11. These side walls 36A' extend from both left and right ends of the front wall 34 toward the back side. The extending end portions on the back side of these side walls 36A' constitute a tip portion 361'.

The second cover component 32a includes a back wall 35, a pair of left and right side walls 36B', a pair of middle partition walls 38B, and a front part 40B. The pair of left and right side walls 36B' each form an extension surface of the side wall portion 22, and serve to separate the external area from the load-side terminal 11. These side walls 36B' extend from both left and right ends of the back wall 35 toward the front side. These side walls 36B' are provided with a reinforcing plate material 363 that is integrally joined to the inside, and the front end of this reinforcing board 363 protrudes toward the front side from the front end of the side wall 36B'. The front end portions of the reinforcing plate material 363 constitute tip portions 363' of both side walls 36B.

In the terminal cover 30a having such a first cover component 31a and a second cover component 32a, all of the first inner frames 50A, 50B, the second inner frames 54A, 54B, and the third inner frames 58A, 58B are In the uncut initial state, the openings of the innermost third inner frame notches 60A and 60B are opposite to each other, and the front end of the reinforcing plate 363 is at the tip of both side walls 36A' of the first cover component 31a. By being installed inside the portion 361', the tip portions 361' and 363' of the side walls 36A' and 36B' in the width direction are arranged so as to overlap each other.

According to the terminal cover 30a, the first cover component 31a and the second cover component 32a are arranged in such a manner that the openings of the notches formed in each of them for passing the electric wires 12 and 13 face each other in the width direction. Since the end portions 361' and 363' of both side walls 36A' and 36B' are arranged so as to overlap each other, the strength of both side walls 36A' and 36B' can be improved. As a result, even if arc gas is generated when the circuit breaker 1a interrupts a short circuit current, the arc gas causes both side walls 36A' of the first cover component 31a and both side walls 36B' of the second cover component 32a to bend. This can be prevented, and leakage of generated arc gas can be suppressed.

Moreover, as shown in FIG. 9, even if the circuit breakers 1a are arranged in parallel on the left and right, and the terminal covers 30a are also arranged in parallel on the left and right in contact with other terminal covers 30a, the arc gas will not reach the other terminal covers 30a. There is no risk of short circuit between phases.

Although the preferred embodiments and typical modifications of the present invention have been described above, the present invention is not limited to these, and various changes can be made.

In the embodiment described above, the outer portion 361a protrudes toward the back side than the inner portion 361b, and a step 361c is formed at the tip portion 361 of the both side walls 36A of the first cover component 31, and the second cover Although the inner portion 362b protrudes toward the front side than the outer portion 362a and a step 362c is formed at the tip portion 362 of the both side walls 36B of the component 32, the present invention is not limited to this. That is, at the tips of both side walls of the first cover component, the inner portion protrudes toward the back side than the outer portion, forming a step, and at the tips of both side walls of the second cover component, the outer portion is formed. may protrude toward the front side from the inner portion to form a step.

In the embodiment described above, the steps 361c and 362c are formed at the tip 361 of the both side walls 36A of the first cover component 31 and the tip 362 of the both side walls 36B of the second cover component 32. In the present invention, the step does not need to be formed.

In the embodiment described above, the steps 361c and 362c are formed at different positions in the extending direction (front and back direction) of both side walls 36A and 36B of the first cover component 31 and the second cover component 32, but this In the invention, the steps may be formed at the same position in the extending direction of both side walls.

In the above-described embodiments, the portions of each connection piece are cut with a cutting tool, but in the present invention, the portions are formed so that they can be cut by hand by bending or twisting depending on the design conditions. You may.

It goes without saying that the present invention is not limited to the embodiments described above, and can be freely modified without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1... Circuit breaker, 11... Load side terminal, 12, 13... Electric wire, 20... Breaker main body, 20a... Front cover, 20b... Back cover, 30... Terminal cover, 31... First cover component, 32... Third 2 cover component, 34...front wall, 34a...operation hole, 34b...snap fit part, 35...back wall, 36A, 36B...side wall, 361, 362...tip part, 361a, 362a...outer part, 361b, 362b... Inner part, 361c, 362c...step, 38A, 38B...middle partition wall, 40A, 40B...front part, 42A, 42B...wire diameter adjustment part, 46...insertion part.

Claims (4)

A terminal cover having a two-part structure consisting of a pair of first cover component and second cover component, and for covering a terminal to which an electric wire is connected,
The first cover component and the second cover component are configured such that openings of notches formed in each of them face each other in order to allow the electric wire to pass therethrough, and at least the tip portions of both side walls in the width direction are mutually opposite to each other. A terminal cover characterized in that the terminal covers are arranged so as to overlap each other. An outer portion of a tip of one of the side walls of the first cover component and the second cover component has an outer portion protruding toward the other of the first cover component and the second cover component than the inner portion. This creates a step,
In the tip portions of the other side walls of the first cover component and the second cover component, the inner portion thereof protrudes more toward one of the first cover component and the second cover component than the outer portion. This creates a step,
The first cover component and the second cover component are arranged such that the outer portion at the tip of one side wall overlaps the inner portion at the tip of the other side wall. The terminal cover according to claim 1. The first cover component and the second cover component are characterized in that steps at the tips of the both side walls are formed at different positions in the extending direction of the both side walls perpendicular to the width direction. The terminal cover according to claim 2. 4. The terminal cover according to claim 1, wherein the terminal is a terminal of a circuit breaker.

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