Upper connecting rod, operating mechanism of circuit breaker and circuit breaker

Abstract

The utility model discloses an upper connecting rod, an operating mechanism of a circuit breaker and the circuit breaker, the upper connecting rod comprises a connecting rod body, the connecting rod body is provided with a rotating hole, a first hinge part and a weight increasing part, the rotating hole, the first hinge part and the weight increasing part are distributed in an acute triangle shape, and the position of the rotating hole is higher than the position of the weight increasing part. The position of the weight increasing part is higher than that of the first hinge part; the main tension spring has the advantage that the requirement for deformation of the main tension spring during installation is lowered.

Description

Technical Field

[0001] The present application relates to a circuit breaker, which is an operating mechanism, specifically an operating mechanism in a circuit breaker. Background Art

[0002] The spring force of the molded case operating mechanism comes from its main tension spring, one end of which is connected to the lever of the operating mechanism, and the other end is connected to the hinge shaft of the upper and lower connecting rods. This is very basic professional knowledge for technicians in the field of circuit breakers.

[0003] The current specification of the molded case circuit breaker is consistent from 125 frame to 1600 frame. As the frame increases, the size of the operating mechanism also gradually increases, and the main tension spring inside will undoubtedly gradually increase. Especially in the 1600 frame, the specification of its main tension spring is very large, and the force to pull the main tension spring to deform is undoubtedly huge.

[0004] The existing 1600 frame molded case circuit breaker also cannot avoid connecting one end of the main tension spring to the hinge shaft of the upper and lower connecting rods. However, due to the gravity of the existing upper connecting rod, the hinge shaft mounting hole on the upper connecting rod (where the hinge shaft of the lower connecting rod is located) is relatively far away from the lever due to gravity in the natural state. In this way, if the main tension spring is to be hung on the lever and the hinge shaft of the upper and lower connecting rods, it is necessary to make the main tension spring deform more. It is very laborious for workers to make such a main tension spring deform more. The structure disclosed in the figure of CN106409627A is such a structure.

[0005] Therefore, how to change the center of gravity of the upper connecting rod so that it can deflect at a certain angle in a natural state to minimize the deformation requirement of the main tension spring during installation is a direction worthy of research. Summary of the invention

[0006] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide an upper connecting rod, an operating mechanism and a circuit breaker.

[0007] The present application provides: an upper connecting rod, which includes a connecting rod body, on which a rotating hole, a first hinge part and a weight-added part are provided, wherein the rotating hole, the first hinge part and the weight-added part are distributed in an acute-angled triangle, the position of the rotating hole is higher than the position of the weight-added part, and the position of the weight-added part is higher than the position of the first hinge part.

[0008] With this structure, since the rotating hole, the first hinge part and the weight-added part are arranged in an acute triangle, and the rotating hole is higher than the weight-added part, and the weight-added part is higher than the first hinge part, after the upper connecting rod is installed, due to the action of the weight-added part, the first hinge part is deflected upward slightly compared with the prior art and is closer to the lever, which can reduce the need for deformation of the main tension spring.

[0009] In some embodiments of the present application, the thickness of the connecting rod body at the weighted portion is the maximum thickness position of the upper connecting rod.

[0010] By adopting this structure, a weight-increasing portion can be formed by thickening a certain part of the connecting rod body.

[0011] In some embodiments of the present application, the weight-increasing portion and the connecting rod body are integrally formed or fixed by welding or riveting or screwing or interference fit.

[0012] There are many ways to thicken a certain part of the connecting rod body to form a weight-added portion. It can be formed as one piece during processing, or it can be formed separately and then fixed by welding, riveting, screwing, interference fit, etc.

[0013] In some embodiments of the present application, the thickness of each part of the upper connecting rod is uniform, and the weight-increasing part is a curled edge, which is formed by a convex structure on the edge of the connecting rod body being bent toward the direction of the connecting rod body.

[0014] With this structure, the thickness of each part of the connecting rod body is consistent, and the curling is formed by bending the convex-convex structure, which is extremely convenient to process.

[0015] In some embodiments of the present application, the connecting rod body includes a first arm and a second arm; the first hinged portion is arranged on the first arm, the weight-added portion is arranged on the second arm, and the rotating hole is located at the connection position between the first arm and the second arm.

[0016] The use of this structure will be beneficial to the arrangement of the acute-angle triangle of the first hinge part, the rotating hole, and the weight-increasing part.

[0017] An operating mechanism comprises a frame, a lever, a jumper, a lower connecting rod, a hinge shaft, a rotating member, a main tension spring and a traction rod; wherein the upper connecting rod mentioned above is also included; the lever and the frame are rotatably arranged, and the jumper and the frame are rotatably arranged; two upper connecting rods are arranged on both sides of the jumper, and the rotating member passes through the rotating holes of the jumper and the two upper connecting rods, so that the upper connecting rod and the jumper form a rotational connection; the lower connecting rod is connected to the first hinged part of the upper connecting rod through the hinge shaft, one end of the main tension spring is connected to the hinge shaft, and the other end is connected to the lever.

[0018] Through this structure, the above-mentioned upper connecting rod is adopted. After the upper connecting rod and the jump buckle are assembled, in a natural state, due to the effect of the weight-increasing part, the first hinge part is deflected slightly toward the direction of the lever compared with the prior art and is closer to the lever. This can reduce the need for deformation of the main tension spring, and workers can easily hang the tension spring on the hinge shaft and the lever.

[0019] In some embodiments of the present application, the rotating member is a riveted shaft, and the upper connecting rod and the jump buckle are riveted to form a stable rotational connection.

[0020] The riveted shaft design can make the jump buckle and the upper connecting rod form a small component, while also ensuring that the upper connecting rod and the jump buckle form a stable rotational connection relationship.

[0021] A circuit breaker comprises a middle cover and a contact support, wherein the contact support is located below the middle cover; wherein the middle cover is provided with the above-mentioned operating mechanism and accessory mounting bracket; the operating mechanism and the accessory mounting bracket are both fixed to the middle cover, and the accessory mounting bracket is located on one side of the operating mechanism; the accessory mounting bracket comprises a first type accessory mounting slot, a second type accessory mounting slot and a third type accessory mounting slot arranged in sequence; the first type accessory mounting slot is used for installing a release; the second type accessory mounting slot is used for installing an auxiliary accessory, and the third type accessory mounting slot is used for installing an alarm accessory.

[0022] With this structure, the design of the accessory mounting bracket can realize one bracket to meet the installation of three accessories. Such an accessory mounting bracket design makes the accessories more concentrated, and there is no need to hollow out the middle cover everywhere to meet the installation of accessories like in the prior art (the prior art is a structure in which each accessory is scattered in each accessory compartment of the middle cover), resulting in insufficient air tightness of the middle cover (inadequate air tightness will cause the airflow to easily pass through the middle cover and break through the upper cover during the circuit breaker disconnection process).

[0023] In some embodiments of the present application, the number of the first type accessory installation slots is two, one of which is used to install an undervoltage release, and the other is used to install a shunt release.

[0024] This structure can simultaneously meet the installation requirements of the undervoltage release and the shunt release.

[0025] In some embodiments of the present application, the number of the second type accessory mounting slots is three.

[0026] This structure can meet the installation requirements of three auxiliary accessories.

[0027] In some embodiments of the present application, the number of the third type accessory mounting slots is two.

[0028] This structure can meet the installation requirements of two alarm accessories.

[0029] In some embodiments of the present application, a first abutting rib is provided on the first type accessory mounting slot, and the first abutting rib is used to abut against a side surface of the releaser.

[0030] The use of this structure will be beneficial to the limited assembly of the release.

[0031] In some embodiments of the present application, a second abutting rib is provided on the second type accessory mounting slot, and the second abutting rib is used to abut against the side surface of the auxiliary accessory.

[0032] The use of this structure will be beneficial to the limited assembly of the auxiliary accessories.

[0033] In some embodiments of the present application, a third abutting rib is provided on the third type accessory mounting slot, and the third abutting rib is used to abut against the side surface of the alarm accessory.

[0034] The use of this structure will be beneficial to the limited assembly of the alarm accessories.

[0035] In some embodiments of the present application, a wire harness collection area is provided on the accessory mounting bracket.

[0036] By adopting this structure, the wiring harnesses of all accessories can be gathered together through the wiring harness collection area for routing, which is convenient for internal routing of the circuit breaker.

[0037] In some embodiments of the present application, a limiting piece for pressing the releaser is also provided on the accessory mounting bracket.

[0038] With this structure, the releaser can be pressed tightly by the limiting piece.

[0039] In some embodiments of the present application, the auxiliary accessory is connected to the second type accessory mounting slot by a snap-on connection.

[0040] Adopting this structure will be beneficial to the assembly of auxiliary accessories.

[0041] In some embodiments of the present application, the alarm accessory is connected to the third type accessory mounting slot by a snap-on connection.

[0042] Adopting this structure will be convenient for assembling alarm accessories.

[0043] In some embodiments of the present application, the first type of accessory mounting slot is located at least directly above a portion of the traction rod, and the actuating component of the release installed in the first type of accessory mounting slot corresponds to the traction rod.

[0044] This structure is helpful for the release to cooperate with the traction rod after it is installed in place.

[0045] In some embodiments of the present application, the second type accessory mounting slot is located at least partially above the contact support, and the auxiliary drive rod of the auxiliary accessory penetrates the middle cover for cooperating with the contact support.

[0046] This structure is helpful for the auxiliary accessories to be matched with the contact support after being installed in place.

[0047] In some embodiments of the present application, the trip latch is rotatably arranged with the frame through a trip latch shaft, and an alarm push rod is provided on the side of the trip latch shaft extending beyond the frame. The alarm push rod moves synchronously with the trip latch shaft, and part of the alarm push rod extends to the bottom of the third type of accessory mounting slot, and the alarm drive rod of the alarm accessory cooperates with the extended part.

[0048] By adopting this structure, the tripping shaft can be used to trigger the alarm attachment. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic diagram of the structure of the upper connecting rod in an embodiment of the present application is shown;

[0051] Figure 2 A schematic perspective view of an upper connecting rod according to an embodiment of the present application is shown;

[0052] Figure 3 A schematic structural diagram of another implementation of the upper connecting rod in an embodiment of the present application is shown;

[0053] Figure 4 A schematic diagram showing the structure of an upper connecting rod in an operating mechanism according to an embodiment of the present application is shown;

[0054] Figure 5 A schematic diagram showing the application of the upper connecting rod in the operating mechanism according to the embodiment of the present application;

[0055] Figure 6 A schematic diagram showing the application of the operating mechanism of the embodiment of the present application in a circuit breaker;

[0056] Figure 7 A schematic diagram of the structure of a circuit breaker accessory and an accessory mounting bracket according to an embodiment of the present application is shown;

[0057] Figure 8 A positional relationship diagram of the actuating parts of each accessory in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0058] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0063] like Figure 1-Figure 8 As shown, an embodiment of the present application is an upper connecting rod 101, and the upper connecting rod 101 is used in the operating mechanism of a molded case circuit breaker.

[0064] The upper connecting rod 101 includes a connecting rod body 101a, on which a rotation hole 101b, a first hinge portion 101c and a weight-added portion 101d are provided. The rotation hole 101b is a round hole, and the first hinge portion 101c is a semi-circular through groove. Of course, in addition to the semi-circular through groove, the first hinge portion 101c can also be a round hole.

[0065] Here, the connecting rod body 101a includes a first arm 1011 and a second arm 1012. The first hinge portion 101c is disposed on the first arm 1011, the weighted portion 101d is disposed on the second arm 1012, and the rotation hole 101b is located at the connection position between the first arm 1011 and the second arm 1012.

[0066] Here, the rotating hole 101b, the first hinge part 101c and the weight-added part 101d are generally arranged in a triangle, and are arranged in an acute triangle an. From the height direction, the first hinge part 101c is located at the bottom, the weight-added part 101d is located in the middle, and the rotating hole 101b is located at the top.

[0067] In this embodiment, there are many options for the weight-increasing portion 101d, for example, it can be an integral molding method or a separate molding method.

[0068] In terms of the one-piece molding method, the thickness of each part of the upper connecting rod 101 and the thickness of each part of the upper connecting rod 101 are different.

[0069] Take the method of uniform thickness and one-piece molding as an example, Figure 1-2 As shown, the weight-increasing portion 101d is a curled edge, which is a convex structure 101d1 on the edge of the connecting rod body 101a. The convex structure 101d1 is bent toward the direction of the connecting rod body 101a to form a curled edge.

[0070] Take the method of inconsistent thickness and one-piece molding as an example, Figure 3 As shown, the weighted portion 101d is a protrusion protruding from the surface of the connecting rod body 101a, and the total thickness of the protrusion is the place where the thickness of the upper connecting rod 101 is the largest.

[0071] Taking the split molding method as an example, the weight-added portion 101d as shown in Figure 3 can be split-molded and then fixed to the connecting rod body 101a by welding, screwing, riveting, interference fit, etc.

[0072] Regardless of the above-mentioned method, the weight-increasing portion 101 d only needs to increase the weight and change the center of gravity of the upper link 101 .

[0073] The technical effect brought about by the design of the weight-increasing portion 101d is explained below through the application of the upper connecting rod 101 in the operating mechanism.

[0074] An operating mechanism includes a frame 102, a lever 103, a jump buckle 104, a lock buckle, a re-buckle, a lower connecting rod 107, a hinge shaft 108, a rotating member 109, a main tension spring 110, a traction rod 111 and other components. The transmission principle of the operating mechanism is already common knowledge to those skilled in the art, and the working principle will not be described in detail here, and only the parts that are different from the prior art in this application will be described in detail.

[0075] The jumper 104 is rotatably connected to the frame 102 via the jumper rotating shaft 112 , and the lever 103 is also rotatably connected to the frame 102 .

[0076] There are two upper connecting rods 101, which are arranged on both sides of the jump buckle 104. The rotating member 109 is a riveted shaft, and the rotating holes 101b of the two upper connecting rods 101 are connected to the jump buckle 104 through the rotating member 109 to form a rotating connection.

[0077] The lower connecting rod 107 is rotatably connected to the first hinge portion 101c of the upper connecting rod 101 through the hinge shaft 108.

[0078] The lever 103 has a spring hanging portion 103 a , and a main tension spring 110 is hung on the spring hanging portion 103 a and the hinge shaft 108 .

[0079] With the above-mentioned upper connecting rod 101 structure, the upper connecting rod 101 is in a natural state during the installation process. Due to the effect of the weight-added portion 101d, the upper connecting rod 101 is Figure 5For example, the first hinged portion 101c is equivalent to a counterclockwise rotation (compared to the upper connecting rod 101 without the weight-increasing portion 101d in the prior art), so that the first hinged portion 101c is closer to the spring suspension portion 103a of the lever 103, so that when the main tension spring 110 is installed, there is no need for the main tension spring 110 to undergo excessive deformation to adapt to the distance between the spring suspension portion 103a and the hinge shaft 108.

[0080] The specific application of this operating mechanism in the circuit breaker is as follows.

[0081] The circuit breaker includes a middle cover 200 and a contact support 300 .

[0082] The operating mechanism is fixed on the middle cover 200 , and the lower connecting rod 107 of the operating mechanism is connected to the contact support 300 , so the movement of the operating mechanism will be transmitted to the contact support 300 to realize the movement of the contact support 300 .

[0083] The accessory mounting bracket 401 is located at one side of the operating mechanism, and the accessory mounting bracket 401 and the middle cover 200 are fastened by screws.

[0084] The accessory mounting bracket 401 is provided with three types of accessory mounting slots, namely, a first type accessory mounting slot 401a, a second type accessory mounting slot 402a, and a third type accessory mounting slot 403a. The three types of accessory mounting slots are arranged in sequence.

[0085] There are two first-type accessory installation slots 401a for installing releases. Here, one of the two is used to install the undervoltage release 401c, and the other is used to install the shunt release 401b. On the inner wall of the first-type accessory installation slot 401a. A first abutting rib 401a1 is provided on the side wall of the first-type accessory installation slot 401a, and the first abutting rib 401a1 is used to abut against the side surface of the release to achieve the limited assembly of the release. There is also a limiting plate 404 above the shunt release 401b and the undervoltage release 401c, and the limiting plate 404 is fixed to the accessory installation bracket 401 to press these releases. The first-type accessory installation slot 401a is located above a part of the traction rod 111, so that when the release is installed, the actuating component of the release can correspond to the traction rod 111.

[0086] There are three second-type accessory installation slots 402a, which are used to install auxiliary accessories 402b. Here, the second-type accessory installation slots 402a are all located above a portion of the contact support 300, so that after the auxiliary accessory 402b is installed, the auxiliary drive rod of the auxiliary accessory 402b penetrates the middle cover 200 and cooperates with the contact support 300. A second abutting rib 402c is provided on the side wall of the second-type accessory installation slot 402a, and the second abutting rib 402c is used to abut against the side surface of the auxiliary accessory 402b, which is more conducive to the installation of the auxiliary accessory 402b in a suitable position. In this embodiment, a snap-on connection is adopted between the second-type accessory installation slot and the auxiliary accessory 402b.

[0087] There are two third-type accessory installation slots 403a, which are used to install alarm accessories 403b. Here, the alarm accessories 403b are all located above a portion of the alarm push rod 113, and the alarm push rod 113 is sleeved on the jump buckle shaft 112 and rotates with the jump buckle shaft 112. The alarm accessory 403b is triggered by the rotation of the jump buckle 104 to push the alarm push rod 113. A third abutting rib 403c is provided on the side wall of the third-type accessory installation slot 403a, and the third abutting rib 403c is used to abut against the side surface of the alarm accessory 403b, which is more conducive to the installation of the alarm accessory 403b in a suitable position. In this embodiment, a snap-on connection is adopted between the third-type accessory installation slot and the alarm accessory 403b.

[0088] There is also a harness gathering area 403d near the third type accessory installation slot 403a. The harness gathering area 403d here is surrounded by ribs to form a through-hole shape, which will help the harness of the accessory to be gathered here.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0090] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An upper connecting rod, characterized in that: It includes a connecting rod body, which is provided with a rotating hole, a first hinge part and a weight-added part. The rotating hole, the first hinge part and the weight-added part are distributed in an acute triangle. The position of the rotating hole is higher than the position of the weight-added part, and the position of the weight-added part is higher than the position of the first hinge part.

2. An upper connecting rod according to claim 1, characterized in that: The thickness of the connecting rod body at the weighted portion is the maximum thickness position of the upper connecting rod.

3. An upper connecting rod according to claim 2, characterized in that: The weight-increasing portion and the connecting rod body are integrally formed or fixed by welding, riveting, screwing or interference fitting.

4. The upper connecting rod according to claim 1, characterized in that: The thickness of each part of the upper connecting rod is uniform, and the weight-increasing part is a curling edge, which is formed by bending a convex structure on the edge of the connecting rod body toward the direction where the connecting rod body is located.

5. An upper connecting rod according to any one of claims 1 to 4, characterized in that: The connecting rod body comprises a first arm and a second arm; the first hinged portion is arranged on the first arm, the weight-increasing portion is arranged on the second arm, and the rotating hole is located at the connection position between the first arm and the second arm.

6. An operating mechanism of a circuit breaker, comprising a frame, a lever, a trip button, a lower connecting rod, a hinge shaft, a rotating member, a main tension spring and a traction rod; characterized in that: It also includes two upper connecting rods as described in any one of claims 1 to 5; the lever and the frame are rotatably arranged, and the jump buckle and the frame are rotatably arranged; the two upper connecting rods are arranged on both sides of the jump buckle, and the rotating member passes through the rotating holes of the jump buckle and the two upper connecting rods, so that the upper connecting rod and the jump buckle form a rotatable connection; the lower connecting rod is connected to the first hinge part of the upper connecting rod through a hinge shaft, one end of the main tension spring is connected to the hinge shaft, and the other end is connected to the lever.

7. The operating mechanism of a circuit breaker according to claim 6, characterized in that: The rotating member is a riveted shaft, and the upper connecting rod and the jump buckle are stably rotated together by riveting.

8. A circuit breaker, comprising a middle cover and a contact support, wherein the contact support is located below the middle cover; characterized in that: The middle cover is provided with an operating mechanism and an accessory mounting bracket as described in any one of claims 6 to 7; the operating mechanism and the accessory mounting bracket are both fixed to the middle cover, and the accessory mounting bracket is located on one side of the operating mechanism; the accessory mounting bracket comprises a first type of accessory mounting slot, a second type of accessory mounting slot and a third type of accessory mounting slot arranged in sequence; the first type of accessory mounting slot is used to install a release; the second type of accessory mounting slot is used to install auxiliary accessories, and the third type of accessory mounting slot is used to install an alarm accessory.

9. A circuit breaker according to claim 8, characterized in that: The number of the first type of accessory installation slots is two, one of which is used to install an undervoltage release, and the other is used to install a shunt release; or / and, the number of the second type accessory mounting slots is three; or / and, the number of third type accessory installation slots is two; Or / and, a first abutting rib is provided on the first type of accessory installation slot, and the first abutting rib is used to abut against the side surface of the release; Or / and, a second abutting rib is provided on the second type accessory installation slot, and the second abutting rib is used to abut against the side surface of the auxiliary accessory; Or / and, a third abutting rib is provided on the third type accessory installation slot, and the third abutting rib is used to abut against the side surface of the alarm accessory; Or / and, a wiring harness collection area is provided on the accessory mounting bracket; Or / and, the auxiliary accessory is connected to the second type accessory installation slot by a snap-fit ​​connection; Or / and, the alarm accessory is connected to the third type accessory installation slot by a snap-on connection; Or / and, the accessory mounting bracket is also provided with a limiting piece for pressing the releaser.

10. A circuit breaker according to claim 8, characterized in that: The first type of accessory installation slot is located at least directly above a portion of the traction rod, and the actuating component of the release device installed in the first type of accessory installation slot corresponds to the traction rod; and / or, the second type of accessory mounting slot is located at least above a portion of the contact support, and the auxiliary drive rod of the auxiliary accessory penetrates the middle cover for cooperating with the contact support; And / or, the jumper is rotatably arranged with the frame through a jumper shaft, and an alarm push rod is arranged on the side of the jumper shaft extending beyond the frame. The alarm push rod moves synchronously with the jumper shaft, and part of the alarm push rod extends to the bottom of the third type of accessory installation slot, and the alarm drive rod of the alarm accessory cooperates with the extended part.

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