JPH01239723A - Circuit breaker - Google Patents

Abstract

PURPOSE:To prevent the damage of the coverage of lead wires by drawing out the lead wires to the outside respectively through guide holes between an insertion clearance of a cover gearing part and a base gearing part. CONSTITUTION:In a breaker 1, an accessary device having a fixing base 5, a cover 6, and a switch 7 is installed, and lead wires 8 of the switch 7 are drawn out from drawing-out holes 4 to the outside. When a mold case 2 and a cover 3 are assembled, the wires 8 are drawn out respectively through an insertion clearance 63 of a cover gearing part 62, and through guide holes A between the gearing part 62 and a base gearing part 54. ln this case, the wires 8 are drawn out individually through the boles A, and bent in the direction different from the passing direction through the insertion clearance 63 of the gearing part 62. As a result, the wires 8 are positioned surely generating no damage at the coverage, and they have a strength to bear the tensile force from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit breaker, and particularly to improving the ease of assembly when an accessory device is assembled between a main body case and a main body cover.

[Conventional technology]

In a general circuit breaker, an accessory device having switch equipment such as an auxiliary switch and an alarm switch is housed within the breaker main body. As a conventional technology for a circuit breaker that houses such an accessory device, there is a Japanese Utility Model Application Publication No. 59-144739.
There is something shown in the publication No.

That is, in this prior art, as shown in FIGS. 27 to 29, the accessory device is housed between the molded case 2 and the molded cover 3 of the circuit breaker main body 1, and the attached device is glued to the VA.
8 is pulled out to the outside. The accessory device includes a mounting base 5, a cover 6, and a microswitch 7 installed between them, and as shown in FIG. 28, when installed between the mold case 2 and the mold cover 3, A plurality of lead wires 8 are bundled together by a stopper 9, and each lead wire 8 is inserted into the draw-out port 4, so that the lead wire 7 can be drawn out. The drawer opening 4 is formed in a rectangular shape so that a reel 8 can be inserted through the outer wall surface of the mold cover 3 and the contact surface with the mold case 2.

By attaching the tube 11 and the shrinkable tube 12 covering it, and closing the gap between the lead wire 8, the mold case 2, and the mold cover 3 with the shrink tube 12 and the tube 11, the arc gas a generated by the tripping operation is prevented from flowing outside. In addition to preventing leakage, it also prevents melted materials such as carbon from depositing on the lead wires 8 and the outlet 4, thereby preventing deterioration of insulation performance. This is to prevent a significant gap B from occurring between the peripheral edge forming the outlet 4 and the lead wire 8 in the first prior art, as shown in FIG. 29.

[Problem to be solved by the invention]

By the way, in the first conventional technique shown in FIGS. 27 to 29, in order to make the lead wires 8 withstand the tensile force from the outside, a part of the binding hand 9 for bundling the lead wires 8 is required. There is a problem that increases the number of parts and assembly man-hours.

In addition, since the lead wire 8 has flexibility, the lead wire 8
Even when trying to position the circuit breaker in the drawer opening 4, the position is not stable. Therefore, when the mold case 2 and mold cover 3 are assembled, that is, when the circuit breaker body 1 is assembled, the lead wire 8 is inserted between them. There is a problem that the lead wire sheathing may be damaged due to being pinched.

In order to solve this problem, it is conceivable to cover the lead wire 8 with an insulating tube as shown by the chain line in FIG. tube to
Not only does the number of +0 zos increase, but it also takes time and effort to attach the insulating tube, and the number of assembly steps is further increased.

Further, in the conventional technique shown in FIG. 30, since the tube 11 and the shrinkable tube 12 are used, the number of parts increases as in the first conventional technique, and moreover, it takes time and effort to assemble them.

In view of the problems of the prior art, an object of the present invention is to enable a lead wire to reliably withstand tensile force from the outside without using special parts, and to position the lead wire at a joint to lead the lead wire. It is an object of the present invention to provide a circuit breaker capable of preventing the wire sheathing from being damaged.

[Failure to solve the problem]

In the present invention, a base engaging portion and a cover engaging portion are provided on one side of the attachment base and the cover of the accessory device, respectively, to extend up to the drawer opening of the circuit breaker main body and engage with the drawer opening in a butted state. It is formed. The cover retaining portion has an insertion space between it and one side of the cover, through which a lead wire of a switch device of an accessory device can be inserted. A guide hole is formed at the abutting end of the cover engaging part and the base engaging part to individually guide the lead wires passing through the insertion space and draw them out to the outside.

[Effect]

In the present invention, when assembling the circuit breaker main body, in the accessory device, the lead wire of the switch device passes through the insertion space of the cover engaging part of the cover, and the guide wire between the cover engaging part and the base retaining part of the base. Since the lead wires are guided individually through the holes and pulled out to the outside, the lead wires can be reliably positioned and held without using any parts, and the breaker body does not pinch the lead wire sheathing, preventing damage to the sheathing. You can prevent saying that.

In addition, since the lead wires are individually guided by the guide holes and pulled out to the outside, the lead wires receive the tensile force from the outside at the contact portion with the cover engaging portion and the base engaging portion. Therefore, it can have the strength to withstand tension without using special parts.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 26. 1 to 4 show a first embodiment of the present invention, in which the same parts as in the conventional example are given the same reference numerals.

In the circuit breaker 1 of the embodiment, an accessory device having a mounting base 5, a cover 6, and a switch device 7 is housed in the circuit breaker main body 1, and a lead wire 8 of the switch device 7 is connected to the circuit breaker main body 1.
It is drawn out to the outside through a drawer opening 4 formed in the.

The circuit breaker main body l, as shown in FIGS. 1 and 2,
It is composed of a molded case 2 and a molded cover 3 that covers the molded case 2. The drawer [14 is the mold case 2
The edges of the outer wall of the mold cover 3 that contact each other are cut out to form a rectangular shape that communicates the inside and the outside.

The mounting base 5 for the accessory device has legs 51 hanging down from both ends of the bottom, and a holding plate 52 that projects upward from the center of both sides and has a groove 53 inside, and the legs 51 are molded. It can be attached to the upper surface of the mold cover 2 by fitting into a recess 2a formed in the case 2. The cover 6 is made of the same thermoplastic resin as the mounting base 5 and has a cylindrical body capable of accommodating the switch device 7, and has grooves 53 of the holding plate 52 of the mounting base 5 on both sides.
When mounted on the mounting base 5, the projection 61 engages with the groove 53 of the temporary presser foot 52, so that it can be assembled to the mounting base 5. The switch device 7 is composed of a microswitch, which is attached between the mounting base 5 and the cover 6, and a lead wire 8 is drawn out from the upper opening of the cover 6.

Thus, a base engaging portion 54 and a cover retaining portion 62 are formed on one side of the attachment base 5 and the cover 6 of the accessory device, which can be engaged with the drawer opening 4 in a mutually abutted state. ing.

As clearly shown in FIGS. 3 and 4, the base engaging portion 54 is formed so that the side surface of the mounting base 5 near the drawer opening 4 is thicker and extends straight to the drawer opening 4, and both sides of the tip 54a abuts against a thin wall portion (not shown) of the outer wall of the mold case 2 that forms the drawer opening 4, and the central portion of its tip engages with the drawer opening 4.

The cover retaining portion 62 is formed on the side of the cover 6 near the drawer opening 4 so as to extend substantially parallel to the side and up to the drawer opening 4, and has a base 62a, a tip 62b, and an engaging plate 62
The - edge 62d of C abuts the thin wall 3a of the outer wall of the mold cover 3 forming the drawer D4, and the upper edge 62d abuts the edge 3b of the mold cover 3 and between the base 62a and the tip 62b. The outer portion 62c is adapted to engage with the drawer opening 4. Moreover, the lead wire 8 of the switch device 7 is drawn in between the inside of the cover retaining portion 62 and the cover 6 and passed through the insertion space 63.

Furthermore, a guide hole A is formed at the end portions of the base engaging portion 54 and the cover engaging portion 62 that abut each other, for guiding the lead wire 8 of the switch device 7 and drawing it out to the outside. The guide hole A connects the center of the base engaging portion 54 to the mounting base 5.
The fourth part 54c is recessed to the same level as the cover engaging part 6.
The lead wire 8 passing through the insertion space 63 between the cover engaging part 62 and the cover 6 is inserted into the recess 54c.
and the guide portion 62C, so that the guide portion 5
4c.

The circuit breaker configured as described above is first installed on the mounting base 5.
Mount the switch device 7 at a predetermined position, and assemble the cover 6 from the second to form an accessory device. Then, after attaching the mounting base 5 to the mold case 2, attach the mold cover 3 to the mold case 2. Assemble.

When assembling the molded case 2 and the molded cover 3, the lead wire 8 of the switch device 7 passes through the insertion space 63 of the cover engaging portion 62 formed in the cover 6 in the attached device, and the cover engaging portion 62 Since the lead wires 8 are individually guided and pulled out by the guide holes A between the base engaging portions 54 formed in the base 5, the lead wires 8 can be reliably positioned and held without using any parts.
The sheathing of the lead wire 8 is not pinched between the mold case 2 and the mold cover 3, and it is possible to prevent the sheath from being pinched and causing scratches.

Also, lead′! a8 are individually guided by the guide holes A and pulled out to the outside, and are bent in a direction different from the direction through which the lead wire 8 passes through the insertion space 63 of the cover engaging portion 62. ) is received at the contact portion with the bar retaining portion 62 and the base engaging portion 54, and can have the strength to withstand the tensile force without using special parts.

Further, the lead wire 8 is pulled out through the guide hole A, and the cover retaining part 62 and the base engaging part 54 forming the guide hole A engage with the lead-out opening 4, so that the mold case 2
Also, the inside of the mold cover 3 can be substantially closed off from the outside.

5 to 7 show various modifications of the first embodiment of the invention.

That is, in FIG. 5, a thin notch 62f is provided in the base 62a of the cover engaging portion 62 formed on the cover 6, and the thin notch 62f can expand the cover engaging portion 62 using the base 62a as a fulcrum. A cover engaging portion 6 is provided at the other end of the side surface on the mouth 4 side.
A locking protrusion 64 capable of locking the tip of 2 is provided.

When inserting the lead wire 8 of the switch device 7, the locking protrusion 64 is pressed in the direction of arrow A to release the locking of the locking protrusion 64 from the cover engaging part 62, and then the cover engaging part 62 is expanded using the thin notch 62f of the base 62a as a fulcrum, and the lead wire 8 is inserted into the insertion space 63 between the cover engaging part 62 and the cover 6. The locking projection 64 locks the cover engaging portion 63 by pressing the tip end portion 62b into the locking projection 64 in the direction of .

Therefore, according to this embodiment, the cover engaging portion 6 of the cover 6
Lead wire 8 of switch device 7 by expanding 2
is inserted between the cover engaging portion 62 and the cover 6, so
Workability when inserting the lead wire 8 is improved.

Further, in FIG. 6, the base retaining portion 54 and the cover retaining portion 6 are shown.
A guide hole A provided between the two is bent in a step-like manner, and the lead wire 8 of the switch device 7 passing through the guide hole A is bent in a step-like manner, thereby reducing the external tensile force of the lead wire 8. This makes it possible to further increase the strength against

Therefore, a rectangular projection 54d facing upward is formed inside the recess 54c of the base engaging portion 54, and a rectangular notch corresponding to the projection 54d is formed inside the guide portion 62e of the cover engaging portion 62. 62g is formed, and the notch 62
The lead wire 8 is bent stepwise by the projection 54d and the projection 54d.

In FIG. 7, the guide hole A and the lead wire 8 passing through it are shown.
a first blocking means for blocking the space between the outside and the inside; and a second blocking means for blocking the space between the base engaging part 54 and the mold case 2, and between the cover engaging part 62 and the mold cover 3, respectively, from the outside and the inside.
．． A third blocking means is provided.

That is, as the first blocking means, a thin elastic piece 54 facing the lead wire 8 is provided in the recess 54C of the base engaging part 54 forming the guide hole A and in the guide part 62e of the cover engaging part 62.
The lead wires 8 and 62h are provided protrudingly in the guide hole A.
When the thin elastic piece 54e is inserted through the lead wire 8, the thin elastic piece 54e
, 62h are deformed so as to come into close contact with the lead wires 8.

As the second blocking means, a mountain-shaped minute protrusion 54f is provided on the bottom surface of the base retaining portion 54 and slightly protrudes toward the mold case 2 along the bottom surface, and is fitted into the mold case 2 with the minute protrusion 54f. A groove (not numbered) is formed.

As the third blocking means, a mountain-shaped minute protrusion 62i is provided on the upper end surface of the cover engaging portion 62 and extends slightly toward the mold cover 3 along the upper end surface, and is fitted into the mold cover 3 with the minute protrusion 62i. A groove (not numbered) is formed.

Then, the minute protrusion 54 of the second blocking means [, l! : The micro protrusion 62 of the third blocking means isolates the base engaging portion 54 and the mold case 2 from the outside to the inside by fitting into the groove.
i and the groove, the cover engaging portion 62 and the mold cover 3 are similarly isolated, and the thin elastic pieces 54e and 62h of the first blocking means are used to close the base engaging portion 54, the cover retaining portion 62, and the lead. Since the wires 8 are similarly cut off, it is possible to prevent the arc gas generated by the tripping operation from leaking to the outside, and also to prevent the insulation from deteriorating even if scattered molten matter adheres.

8 to 11 show a second embodiment of the invention.

This embodiment differs from the first embodiment in that the outlet 4 provided in the outer wall of the circuit breaker main body 1 extends to one end of the outer wall of the ε circuit breaker main body 1 and is formed in an elongated shape.

That is, the elongated drawer opening 4 is connected to the mold cover 3.
It is formed linearly by notching the edge of the outer wall that contacts the molded case 2 from the center to one end.

Further, on one side of the mounting base 5 and the cover 6 of the accessory device, there is provided an elongated shape that extends up to the elongated drawer opening 4 and that engages with the elongated drawer opening 4 in a state where they are abutted against each other. The base engaging part 540 and the elongated cover engaging part 62
0 is formed.

As shown in FIGS. 9 and 10, the base retaining portion 540 has the same thickness and width as the side surface of the mounting base 5 near the drawer port 4, and is attached to the drawer port 4 side of the molded case 2. A base 541 is formed that reaches the thin outer wall 2b,
A 1°-shaped outer wall 542 is formed at the top of the tip of the base 541, and a U-shaped outer wall 543 is formed at one end of the outer wall 542 by extending the inner end of the outer wall 542 upward.
It extends to the end of the elongated drawer opening 4.

As shown in FIG.
A base portion 621 having a thickness of up to 1 mm is provided in a protruding manner, and is provided at the upper end of the base portion 621 in correspondence with the L-shaped outer wall 542, and is in contact with the thin outer wall 3C of the mold cover 3 on the drawer opening 4 side. An L-shaped outer wall 622 having a first protrusion 623 in contact with the outer wall 622 is formed, and one end of the outer wall 622 is shaped like an L-shape in correspondence with the opening-shaped outer wall 543 and has an upper portion fitted with a groove in the mold cover 3. A mouth-shaped outer wall 624 having two protrusions 625 is formed to extend to the outer end of the mold cover 3. Therefore, the base retaining portion 540 and the cover engaging portion 620 are attached to the respective mouth-shaped outer walls 543.6.
24 to fit into the elongated drawer opening 4, and the lead wire 8 of the switch device 7 is inserted between the two.
It has a cylindrical shape so that it can be inserted in line.

Note that the respective outer walls forming the elongated drawer opening 4 of the mold case 2 and the mold cover 3 are formed of the mouth-shaped outer wall 543. as shown in FIG. The part on the G24 side is formed thick, and a guide 3d is provided on the inner side of the outer wall of the mold cover 3 to guide both the opening-shaped outer walls 543 and 624 and come into contact with the mold case 2.

Furthermore, as shown in FIG. 9, the cover fitting part 620 is provided with an insertion part 626 formed by cutting out a part of the base part 621 at the upper part thereof, and the lead wire 8 is inserted into the cover through the insertion part 626. The lead wire 8 is inserted between the part 620 and the base fitting part 540 so that the lead wire 8 can be drawn out from the tips of both parts 620 and 540.

According to this embodiment, the lead wire 8 of the switch device 7 is inserted between the base fitting part 540 and the cover fitting part 620 along the long direction and pulled out to the outside. By being able to position and hold the lead wire 8 in the longitudinal direction, it is possible to prevent the sheathing of the lead wire 8 from getting caught when the mold case 2 and mold cover 3 are assembled, and also to prevent the lead wire 8 from being subjected to external tensile force. Not only can the lead wire 8 be provided with sufficient strength even when the wire is bent, but also the lead wire 8 can be prevented from bending.

In FIG. 8, an imaginary line indicates that by arranging the base engaging portion 540 and the cover retaining portion 620 on the left side of the figure, the lead wire 8 can be drawn out to the opposite side from this example.

12 and 13 show a third embodiment of the invention.

In this case, a U-shaped groove 21 is formed in the outer wall surface of the molded case 2 to connect with the outlet 4 provided in the circuit breaker body 1 . The U-shaped a21 is formed on the outer wall surface of the mold case 2 from a position facing the drawer opening 4 toward the bottom, and extends from the bottom along the length direction of the mold case 2 to the outer end. has been done.

In addition, the attachment base 5 and the cover 6 of the attached device have a cylindrical shape in abutted state on the side of the drawer opening 4, and extend to the drawer opening 4 and engage with the drawer opening 4. A base engaging portion 5 that fits into the U-shaped connector 21
40' and a cover retaining part 620' are formed, and by inserting the lead wire 8 of the switch device 7 between the base engaging part 540' and the cover retaining part 620', the lead wire can be removed from the bottom side of the mold case 2. I'm trying to pull out an 8.

Therefore, according to this embodiment, basically the same effects as those of the second embodiment can be obtained.

Although this example shows an example in which the U-shaped groove 21 is formed in the mold case 2, as shown in FIG. It is also possible to provide a base retaining portion 540' and a cover engaging portion 620'.

15 to 17 show a fourth embodiment of the present invention.

In this case, it has a cylindrical shape through which the lead wire 8 of the switch device 7 can be inserted while abutting against the attachment base 5 and cover 6 of the accessory device, and is arranged at an inner position of the circuit breaker body 1. At the same time, a cylindrical guide that communicates with the outlet 4 of the circuit breaker main body 1 is formed.

As the cylindrical guide, as shown in FIGS. 16 and 17, a half-divided guide portion 540 provided on the mounting base 5 is used.
A and a half-divided guide portion 620A provided on the cover 6 are formed in a shape comparable to that of the embodiment shown in FIG.
Details are omitted.

According to this embodiment, the lead wire 8 of the switch device 7 is guided at the inner position of the circuit breaker body 1 and led to the drawer opening 4 of the circuit breaker body 1, so that the mold case 2 of the circuit breaker body 1 and the mold cover 3 and 3 are assembled together, the lead wire 8 is not pinched, and the lead wire 8 can sufficiently withstand tensile force from the outside.

In this example, the lead wire 8 is wired in a position closer to the front in the circuit breaker body 1, but it may be wired in a position closer to the back as shown in FIG.
It is also possible to wire for two accessory devices as shown in the figure.

20 and 21 show a fifth embodiment of the present invention.

In this embodiment, the lead wire 8 drawn out from the outlet 4 of the circuit breaker main body 1 is guided in a bent state in a guide groove 22 formed in the molded case 2 of the circuit breaker main body 1, and An insertion portion 23 through which the lead wire 8 is inserted is formed in the bent portion of the wire 22 .

In this case, the outlet 4 is cut out at the upper end of the mold case 2 so that the lead wire 8 can be inserted from the inside to the outside. The guide groove 22 is cut vertically straight in the outer wall of the molded case 2 from the drawer opening 4 to its bottom, and is also cut horizontally in the bottom to the side edge of the molded case 2 to guide the lead wire 8. I'm trying to do what I can.

The insertion portion 23 is provided at a position bent from the vertical direction to the horizontal direction in the guide groove 22 of the molded case 2, and is configured to lock the lead wire 8 by inserting the bent lead wire 8 therethrough.

Figures 22 and 23, Figures 24, 25 and 26
The figures each show a modification of the fifth embodiment.

That is, in the embodiment shown in FIGS. 22 and 23, the outlet 4 is formed on the outside of the molded case 2, and a recess 24 for locking the lead wire 8 at a position near the outlet 4 of the molded case 2 is provided. , a convex portion 25 is formed, and a lead wire 8 passing through the inside of the molded case 2 is engaged with the concave and convex portions 24 and 25 and drawn out through the outlet 4.

In the embodiment shown in FIG. 24, a concave groove 26 with a narrow opening 27 is formed in the vicinity of the outlet 4 of the mold case 2, and a middle portion of the lead wire 8 is inserted into the concave groove 26 to open the opening. The lead wire 8 is locked between the protrusions 27 forming the .

In the embodiment shown in FIGS. 25 and 26, a member 28 for locking the lead wire 8 is used. The member 28 is formed in a V-shape with an insertion portion 28a so that the lead wire 8 can be inserted when the open end is closed. It is installed by.

In the embodiments shown in FIGS. 20 to 26 above:
Since all the lead wires 8 are drawn out from the outside end of the bottom of the molded case 2, it is possible to install a plurality of circuit breaker bodies l while keeping them in contact as shown in FIG.
It is no longer necessary to take the space C between each circuit breaker body 1 as in the conventional example shown in FIG. 31, and space saving can also be achieved.

〔Effect of the invention〕

As described above, the present invention makes it possible to reliably maintain the positioning of the lead wire of a switch device as an accessory device without using any parts, thereby preventing the lead wire sheathing from being pinched and damaged when assembling the circuit breaker main body. This also has the effect of being able to prevent the above problems, and to have the strength to withstand the tensile force applied from the outside of the lead wire without using special parts.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a perspective view of essential parts showing a first embodiment of the present invention, FIGS. 3 and 4 are an overall perspective view and an exploded perspective view showing an accessory device, FIG. 5 is a plan view showing a modified example of the cover, FIGS. 6 and 7 are sectional views and enlarged sectional views of essential parts showing various modified examples of the cover retaining part and the base retaining part, respectively. 8 is a front view showing the second embodiment of the present invention, FIG. 9 is a perspective view of the attached device, FIG.
Figure 1 is a sectional view taken along line X-X of Figure 8 and the same (XI
vA sectional view, FIG. 12 is a front view showing the third embodiment of the present invention, FIG. 13 is a perspective view of an accessory device, FIG. 14 is a front view showing a modification of the third embodiment, and FIG. 15 is a front view showing a modification of the third embodiment. The figure shows the fourth aspect of the present invention.
FIG. 16 is a front view showing an example of the embodiment, and FIG. 16 is a perspective view of the attached device.
Figure 17 is a sectional view of the main part, Figures 18 and 19 are the 4th section.
FIG. 20 is an explanatory side view showing the fifth embodiment of the present invention, and FIG.
al and (bl are front views showing the circuit breaker main body and its H-
22 is a front view showing a modified example of the fifth embodiment, FIG. 23 is a broken explanatory view of the main part corresponding to the direction of arrow I in FIG. 22, and FIG. 24 is another example. Fig. 25 is an explanatory drawing corresponding to Fig. 23 showing still another example, Fig. 26 (al and (bl) is a front view of the locking member, and J in Fig. 25 is an explanatory drawing corresponding to Fig. 23 showing another example. -J line sectional view. Fig. 27 is an enlarged plan view showing the main parts of a conventional circuit breaker;
FIG. 28 is a sectional view, FIG. 29 is a front view of the drawer opening, FIG. 30 is an enlarged sectional view of another conventional example, and FIG. 31 is a side view of a conventional installation example. l... Breaker main body, 4... Drawer opening, 5... Mounting base, 54... Base engaging portion, 6... Cover, 6
2... Cover engaging portion, 63... Insertion space, 7...
Switch device, 8...Lead wire, A...Guide hole. Agent Patent Attorney Tadashi Akimoto Business 4 Figure - [F] (〜■ [F] Figure 7 Figure 8 Figure 9 X X+ Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Page 17 Figure 18 Figure 19 Figure 20 Figure 23 Figure 24 Patrol [F] L'''' Figure 25 Go Figure 26 (C) (b) Figure 27 Figure 28 Figure 1 29 faces - people

Claims (1)

[Claims] 1. A mounting base, a cover to be assembled with this, and an accessory device including a switch device installed between the two are housed in the circuit breaker body, and the switch device is inserted through a drawer opening provided on the outer wall of the circuit breaker body. A circuit breaker in which a lead wire is drawn out to the outside, the circuit breaker having a mounting base of the accessory device and one side of the cover extending up to the outlet of the circuit breaker body and engaging with the outlet in a state where they abut each other. A base engaging portion and a cover engaging portion are formed, the cover engaging portion has an insertion space between the cover and the lead wire of the switch device through which the lead wire of the switch device can be inserted, and the cover engaging portion and the base engaging portion have an insertion space between the cover engaging portion and the base engaging portion. A circuit breaker characterized in that a guide hole for individually guiding the lead wires passing through the insertion space and drawing them out to the outside is formed in the circuit breaker.