CN217641145U - Plug-in circuit breaker - Google Patents

Abstract

The utility model provides a plug-in circuit breaker, includes circuit breaker casing and the locking mechanical system of setting in the circuit breaker casing, locking mechanical system is including can stretching out the locking arch outside the circuit breaker casing and in the withdrawal circuit breaker casing, still including being used for exerting drawing effort drawing mechanism to plug-in circuit breaker, is equipped with the slip hole on at least one lateral wall of circuit breaker casing, drawing mechanism includes the drive structure that stretches into the circuit breaker casing through the slip hole from the circuit breaker casing is external, and drive structure can slide in the slip hole, and drive locking mechanical system makes the protruding withdrawal circuit breaker casing of locking to extract plug-in circuit breaker, drawing mechanism's drive structure can follow the circuit breaker casing outside installation and insert in the circuit breaker casing, is used for driving locking mechanical system unblock, and extracts plug-in circuit breaker, and simple structure is convenient, easily installs and changes, and is very much, also can change corresponding drawing mechanism in the outside to a plurality of circuit breaker poles.

Description

plug-in circuit breaker

technical field

The invention relates to the field of low-voltage electrical appliances, in particular to a plug-in circuit breaker.

Background technique

With the development of communication technology, communication cabinets have further put forward requirements on the height direction and the installation method of circuit breakers, and the power distribution space of equipment has been further compressed. The circuit breaker with a height of 1U and the plug-in installation method conform to the trend, but most of the existing 1U The size of the plug-in circuit breaker is difficult to take out and difficult to operate after it is installed in the cabinet. This type of plug-in circuit breaker is inserted into the cabinet side by side. When taking out, the circuit breaker is taken out from the cabinet by pulling the opening and closing button of the circuit breaker. Since the height and thickness of the circuit breaker exposed to the operation surface of the cabinet are about 4cm and 2cm respectively (Of course, it can be thicker or thinner), the button is small, it is inconvenient to pull out, and it is easy to cause wrong closing or opening operation.

In addition, the existing multi-pole plug-in circuit breakers are formed by splicing multiple independent circuit breaker poles side by side, and each circuit breaker pole is provided with an independent pulling mechanism, which requires an additional structure to pull each circuit breaker pole. The pulling mechanism is spliced together, the structure is more complicated, the space occupied is also larger, and it is not convenient to use.

SUMMARY OF THE INVENTION

The purpose of the invention is to overcome the defects of the prior art and provide a plug-in circuit breaker.

To achieve the above object, the present invention has adopted the following technical solutions:

A plug-in circuit breaker, comprising a circuit breaker casing and a locking mechanism arranged in the circuit breaker casing, the locking mechanism comprising a locking protrusion capable of extending out of the circuit breaker casing and retracting into the circuit breaker casing, and further comprising: In order to apply a pulling force to the plug-in circuit breaker, a pulling mechanism is provided with a sliding hole on at least one side wall of the circuit breaker casing, and the pulling mechanism includes extending into the circuit breaker casing from outside the circuit breaker casing through the sliding hole. The driving structure in the body can slide in the sliding hole, and the driving locking mechanism causes the locking protrusion to retract into the circuit breaker casing, so as to pull out the plug-in circuit breaker.

Preferably, the circuit breaker housing includes an operation surface and a rear end surface arranged oppositely, an upper side wall and a lower side wall arranged oppositely, and two sidewalls arranged oppositely, and a circuit breaker circuit is provided on the operation surface for driving the circuit breaker. In the closing operating member, a locking hole is provided on the upper side wall and/or the lower side wall, the locking protrusion protrudes from the locking hole, and the sliding hole is provided on both side walls.

Preferably, the sliding hole is in the shape of a long strip, and its length direction is parallel to the direction in which the plug-in circuit breaker is inserted into the cabinet, and perpendicular to the plane where the operation surface is located.

Preferably, the pulling mechanism includes an operating structure, a driving structure and a connecting structure connected between the operating structure and the driving structure, the operating structure is used for applying a pulling force, and at least one side of the circuit breaker case is The wall is also provided with a first accommodating groove for accommodating the connecting structure of the drawing mechanism so that the connecting structure does not protrude from the side wall of the circuit breaker housing, and the sliding hole is arranged in the first accommodating groove.

Preferably, the operating surface of the circuit breaker housing is provided with a second accommodating groove for accommodating at least part of the operating structure.

Preferably, the driving structure includes a driving protruding rod, the driving protruding rod extends into the circuit breaker casing from the sliding hole, and directly or indirectly drives the locking mechanism to retract the locking protrusion into the circuit breaker casing.

Preferably, the locking mechanism includes a locking member, the locking member is rotatably or slidably installed in the circuit breaker housing, the locking member is provided with a locking protrusion, and the elastic member drives the locking member to move so that the locking protrusion extends out of the circuit breaker outside the housing.

Preferably, the middle part of the locking member is rotatably installed in the circuit breaker housing, the locking protrusion is protruded on the upper side of one end, and the driving arm is extended on the other end, and the driving arm extends to the sliding path of the driving structure On the upper side, the elastic member drives the locking member to rotate so that the locking protrusion extends out of the circuit breaker casing, and the driving structure slides through the driving arm to drive the locking member to rotate, so that the locking protrusion retracts into the circuit breaker casing.

Preferably, the locking member is linearly slidable in the circuit breaker casing, the elastic member drives the locking member to linearly slide so that the locking protrusion protrudes out of the circuit breaker casing, the locking mechanism further includes an unlocking lever, one end of the unlocking lever is hinged with the locking member The other end of the unlocking rod is located on the sliding path of the driving structure, and the sliding of the driving structure drives the unlocking rod to rotate and then drives the locking piece to slide, so that the locking protrusion retracts into the circuit breaker housing.

Preferably, the pulling mechanism includes a pulling member, and the pulling member includes an operating rod and two connecting rods, one end of the two connecting rods is respectively connected with the operating rod, and the ends of the two connecting rods are bent toward each other. There is a drive lug as a drive structure.

Preferably, the circuit breaker housing is further provided with a reset member for driving the drawing mechanism to reset.

Preferably, the pulling mechanism includes an operating structure, a driving structure, and a connecting structure connected between the operating structure and the driving structure, the operating structure is provided corresponding to the operating surface of the circuit breaker housing, and the operating member is a handle. The operating structure is shielded when it is rotated to the closing position, and the operating structure is avoided when it is rotated to the opening position.

Preferably, it includes a plurality of circuit breaker poles, each circuit breaker pole includes a circuit breaker casing, the side walls on both sides of the circuit breaker casing are provided with the sliding holes, and the circuit breaker casings of the plurality of circuit breaker poles are arranged side by side. and the sliding holes are correspondingly arranged; the driving structure of the pulling mechanism penetrates the sliding holes of the multiple circuit breaker casings, synchronously drives the locking mechanisms in the multiple circuit breaker casings to synchronously unlock, and synchronously removes the multiple circuit breaker poles from the cabinet. pull out.

Preferably, the pulling mechanism includes a pulling member and a pulling linkage as a driving structure, the pulling linkage penetrates through the sliding holes of a plurality of circuit breaker housings, and the pulling linkage is connected with the pulling member.

The plug-in circuit breaker created by the present invention is provided with an independent pulling mechanism, which can avoid misoperation of opening and closing, and a sliding hole is arranged on the side wall of the circuit breaker casing, so that the driving structure of the pulling mechanism can be opened from the circuit breaker. The outside of the circuit breaker casing is installed and inserted into the circuit breaker casing to drive the locking mechanism to unlock and pull out the plug-in circuit breaker. The structure is simple and convenient, and it is easy to install and replace.

In particular, for a plug-in circuit breaker with a single circuit breaker pole, or a multi-pole plug-in circuit breaker in which multiple circuit breaker poles are assembled side by side, the corresponding drawing mechanism can be replaced on the outside, so that the drawing mechanism can be integrated structure, easy to install and replace.

In addition, the pulling mechanism includes a pulling linkage, the pulling linkage passes through the sliding holes of the adjacent side walls of the adjacent circuit breaker casings, and the locking mechanism of the plurality of circuit breaker poles is linked by the pulling linkage, The locking mechanism for synchronously driving the multi-pole plug-in circuit breaker is synchronously unlocked, and the multi-pole plug-in circuit breaker is synchronously pulled out from the cabinet.

Description of drawings

1 is a schematic structural diagram of a circuit breaker housing and a drawing mechanism of a plug-in circuit breaker according to Embodiment 1;

FIG. 2 is a schematic structural diagram of the circuit breaker housing of the first embodiment, with the drawing mechanism in FIG. 1 removed;

3 is a schematic structural diagram of the locking mechanism and the pulling mechanism in the circuit breaker housing of the first embodiment, and the locking mechanism is in a locked state at this time;

4 is a schematic structural diagram of the locking mechanism and the pulling mechanism in the circuit breaker housing of the first embodiment, and the locking mechanism is in an unlocked state at this time;

5 is a schematic structural diagram of the drawing member of the first embodiment;

6 is a schematic structural diagram of the unlocking lever of the first embodiment;

7 is a cross-sectional view of the cooperation between the locking mechanism and the pulling mechanism of the second embodiment;

FIG. 8 is a schematic diagram of the structure of the drawing member of the second embodiment.

Detailed ways

The specific embodiments of the plug-in circuit breaker created by the present invention are further described below with reference to the embodiments given in the accompanying drawings. The plug-in circuit breaker created by the present invention is not limited to the description of the following embodiments.

As shown in Figures 1-2, a plug-in circuit breaker includes a circuit breaker casing 4 and an operating mechanism, a moving contact, a static contact, and a protection mechanism arranged in the circuit breaker casing 4 and locking mechanism 2 and other components. The circuit breaker housing 4 has a cuboid-shaped hexahedron structure, including an operation surface and a rear end surface arranged oppositely, an upper side wall and a lower side wall arranged oppositely, and two sidewalls arranged oppositely. The side wall and the lower side wall are connected between the operating surface and the rear end surface. The operating surface is provided with an operating member 3 for driving the circuit breaker to open, the operating member 3 is connected with the operating mechanism, and the operating member 3 can be a handle or a button, and the rear end surface is provided with a terminal for connecting with the operating mechanism. The busbars in the cabinet are inserted and matched, and an indication window can also be set on the operating surface to indicate the opening and closing status of the circuit breaker. The operating surface can be provided with wiring terminals or no wiring terminals, and the plug-in circuit breaker is inserted into the cabinet. Basically, only the operation surface is exposed outside the cabinet; the upper side wall and/or the lower side wall is provided with a locking hole, and the locking mechanism 2 includes a switch that can extend out of the circuit breaker casing 4 and retract into the circuit breaker casing 4. A locking protrusion 24, the locking protrusion 24 protrudes from the locking hole for cooperating with the limit of the cabinet, and locks the plug-in circuit breaker in the cabinet, and the locking protrusion 24 retracts the circuit breaker housing 4 from the locking hole When inside, the plug-in circuit breaker can be pulled out from the cabinet. Generally, the direction of the operation facing the rear end is the length direction of the circuit breaker, the direction of the upper side wall and the downward side wall is the height direction of the circuit breaker, and the two sides are the height direction of the circuit breaker. The direction between the walls is the width direction of the circuit breaker, which is the prior art and will not be repeated here.

An improvement point of the present application is that it further includes a pulling mechanism 1 for pulling the plug-in circuit breaker out of the cabinet. At least one side wall of the circuit breaker housing 4 is provided with a sliding hole, and the pulling mechanism 1 includes a drive structure extending from the outside of the circuit breaker casing 4 into the circuit breaker casing 4 through a sliding hole, the driving structure can slide in the sliding hole, and the driving locking mechanism 2 makes the locking protrusion 24 retract into the circuit breaker casing 4 , and apply a pulling force to the plug-in circuit breaker to pull out the plug-in circuit breaker.

The plug-in circuit breaker created by the present invention is provided with a sliding hole on the side wall of the circuit breaker casing 4, so that the driving structure of the pulling mechanism 1 can be installed and inserted into the circuit breaker casing 4 from the outside of the circuit breaker casing 4. The drive locking mechanism 2 is unlocked and the plug-in circuit breaker is pulled out, so the structure is simple and convenient; in particular, the plug-in circuit breaker with a single circuit breaker pole, or a multi-pole plug-in circuit breaker in which multiple circuit breaker poles are assembled side by side can be used. The circuit breaker can replace the corresponding pulling mechanism 1 on the outside, so that the pulling mechanism 1 can form an integrated structure, which is easy to install and replace.

As shown in Figures 1 and 5, the drawing mechanism 1 includes an operating structure, a driving structure and a connecting structure connected between the operating structure and the driving structure, and the operating structure is used to apply a drawing force manually and by means of a tool, The operating structure is provided corresponding to the operating surface of the circuit breaker housing 4 for easy operation. Preferably, the operating member 3 is a handle, which covers the operating structure when the handle is rotated to the closing position, and avoids the operating structure when it is rotated to the opening position, so as to ensure that the drawing mechanism can only be operated when the circuit breaker is open. 1. As shown in Figure 1-2, this is the state when the circuit breaker is open.

As shown in FIG. 5 , the pulling mechanism 1 of this embodiment includes a pulling member 10 , and the pulling member 10 includes an operating rod 105 as an operating structure and a connecting rod 103 as a connecting structure, and one end of the two connecting rods 103 They are respectively connected with the operating rods 105 to form a U-shaped structure. The ends of the two connecting rods 103 are bent toward each other and provided with a driving protruding rod 101 as a driving structure. The driving protruding rod 101 extends into the circuit breaker housing 4 through the sliding hole. Internally, it cooperates with the limit of the plug-in circuit breaker for pulling out the plug-in circuit breaker. In particular, the driving protruding rod 101 can also slide in the sliding hole to directly or indirectly drive the locking mechanism 2 to unlock, even if the locking protrusion 24 is retracted into the circuit breaker housing 4, the limit of the plug-in circuit breaker and the cabinet is released. .

As shown in Figure 1-2, an operating member 3 is provided on the operating surface of the circuit breaker housing 4, a wiring terminal is provided on the rear end surface opposite to the operating surface, and an upper side wall of the circuit breaker housing 4 is provided There are locking holes, the locking protrusions 24 in the circuit breaker casing 4 protrude from the locking holes, and sliding holes are provided on both side walls of the circuit breaker casing 4, and the driving protruding rod 101 extends into the circuit breaker from the sliding holes. inside the housing 4. The sliding hole is in the shape of a long strip, and its length direction is parallel to the direction in which the plug-in circuit breaker is inserted into the cabinet, and perpendicular to the plane where the operation surface is located.

The operating rod 105 and the connecting rod 103 are located outside the circuit breaker housing 4 , and the operating rod 105 is located on the side of the operating surface, which is convenient for manual pulling or pulling with tools, and the two connecting rods 103 correspond to both sides of the circuit breaker housing 4 respectively. wall. The operating rod 105 described in this embodiment is a straight-shaped rod-shaped structure, which can also be bent into a V-shaped or arc-shaped according to needs. Structures such as an operating handle, a handle, a pull ring, or a pull hook are used as the operating structure.

Preferably, at least one of the two side walls of the circuit breaker housing 4 is further provided with a first accommodating groove 133 for accommodating the connection structure of the pulling mechanism 1, and the sliding hole is provided in the first accommodating groove 133, the connecting structure can be limited and slid in the first accommodating groove 133, and the connecting structure does not protrude from the two side walls of the circuit breaker housing 4, does not affect the width of the plug-in circuit breaker, and does not affect multiple Plug-in circuit breakers are spliced side by side to form a multi-pole circuit breaker. The length of the first accommodating groove 133 may be greater than or equal to the length of the sliding hole. Preferably, the operating surface of the circuit breaker housing 4 is further provided with a second accommodating groove 135 for accommodating at least part of the operating structure. The second accommodating groove 135 in this embodiment is used for accommodating the entire operating rod 105 as an operating structure, and a notch is provided on the second accommodating groove 135 to facilitate the pulling of the operating rod 105 .

As shown in FIGS. 3-4 , the locking mechanism 2 of this embodiment includes a locking member 20 , the locking member 20 is rotatably or slidably installed in the circuit breaker housing 4 , and the locking member 20 is provided with a locking protrusion 24, the elastic member 23 drives the locking member 20 to move so that the locking protrusion 24 protrudes out of the circuit breaker housing 4. The driving protruding rod 101 of the pulling mechanism 1 as the driving structure passes through the sliding hole, and the driving protruding rod 101 slides to directly or indirectly drive the locking piece 20 to move.

In an embodiment shown in FIGS. 3-4 , the locking member 20 is linearly disposed in the circuit breaker casing 4 , and the elastic member 23 drives the locking member 20 to linearly slide so that the locking protrusion 24 extends out of the circuit breaker casing 4 In addition, the sliding direction of the locking member 20 is perpendicular to the direction in which the circuit breaker is inserted into the cabinet. The locking mechanism 2 further includes an unlocking rod 21, the first end of the unlocking rod 21 is hinged with the locking member 20, and the second end of the other end is located on the sliding path of the driving structure, and the driving structure slides to drive the unlocking rod 21 to rotate and then drive the locking member. 20 is slid so that the locking projection 24 is retracted into the circuit breaker housing 4 . Specifically, the sliding of the driving protruding rod 101 lifts the second end of the unlocking rod 21, so that the unlocking rod 21 rotates around the unlocking protrusion 22 in the circuit breaker housing 4, and the locking member 20 is pressed down by the first end, so that the locking protrusion The lifter 24 is retracted into the circuit breaker housing 4, and after the driving protruding rod 101 is limited by one end of the sliding hole, the plug-in circuit breaker is pulled out from the cabinet through the pulling member 10. When the pulling member 10 is reset, the elastic member 23 drives the locking member 20 to reset and the locking protrusion 24 protrudes out of the circuit breaker housing 4 . The elastic member 23 may be various elastic members such as a compression spring, a torsion spring, and a leaf spring.

As shown in FIG. 6 , the unlocking lever 21 is integrally formed by bending, one end of which is bent and provided with a connecting portion 211 for inserting into the locking member 20 for hinged connection, and the other end is provided with a relatively straight unlocking portion 213 for In cooperation with the driving protruding rod 101 of the pulling member 10 , a bent portion 212 is provided in the middle portion, which is used to abut against the inner wall of the circuit breaker housing 4 as a pivot for the rotation of the unlocking rod 21 . It should be noted that the middle of the unlocking lever 21 in this embodiment is provided with a bent portion 212, which is used to abut against the inner side wall of the circuit breaker housing 4 as a pivot for the unlocking lever 21 to rotate; obviously, the unlocking lever 21 can also be directly in the middle. It is rotatably mounted on the circuit breaker casing 4, or, the inner side wall of the circuit breaker casing 4 can also be provided with an unlocking protrusion 22, and the unlocking lever 21 can also be rotated with the unlocking protrusion 22 as a fulcrum, or other similar solutions All are possible.

Another embodiment is that the middle of the locking member 20 is rotatably installed in the circuit breaker housing 4, the locking protrusion 24 is protruded on the upper side of one end, and the driving arm is extended on the other end of the locking member. 23 Drive the locking piece 20 to rotate so that the locking protrusion 24 extends out of the circuit breaker housing 4, the driving arm extends to the sliding path of the driving structure, and the elastic piece 23 drives the locking piece 20 to rotate so that the locking protrusion 24 extends out of the circuit breaker housing In addition, the driving structure slides through the driving arm to drive the locking piece 20 to rotate, so that the locking protrusion 24 is retracted into the circuit breaker housing 4 .

As shown in the second embodiment shown in FIGS. 7-8 , the main difference between this embodiment and the first embodiment is that the circuit breaker housing 4 is further provided with a reset member 12 for driving the drawing mechanism 1 to reset. Preferably, the reset member 12 acts on the reset protrusion 102 of the drawing member 10 , and when the drawing member 10 is released, the reset member 12 can drive the drawing member 10 to reset to the initial position. Of course, the reset member 12 may not be provided to reset the drawing member 10 by manual operation, and the reset member 12 may also indirectly drive the drawing member 10 to reset.

The pulling mechanism 1 of this embodiment includes a pulling member 10 , and the pulling member 10 includes an operating rod 105 as an operating structure and a connecting rod 103 as a connecting structure, and one end of the two connecting rods 103 is respectively connected with the operating rod 105 A U-shaped structure is formed. The difference between this embodiment and the first embodiment is that the end of one connecting rod 103 of the two connecting rods 103 is bent and provided with a driving protruding rod 101 for extending into the circuit breaker through the sliding hole Inside the casing 4, the locking mechanism 2 is driven to unlock, so that the locking protrusion 24 is retracted into the circuit breaker casing 4, and the plug-in circuit breaker is pulled out from the cabinet; and the other connecting rod 103 of the two connecting rods 103 The end of the circuit breaker is bent with a reset protrusion 102, which is used to extend into the interior of the circuit breaker housing 4 through the sliding hole to cooperate with the reset member 12 and drive the pull-out member 10 to reset. The lengths of the two connecting rods 103 in this embodiment are different, so that the reset protrusion 102 can abut against the circuit breaker case 4 when reset. One end of the reset piece 12 is connected to the reset protrusion 102 and the other end is connected to the circuit breaker case 4 , of course, the lengths of the two connecting rods 103 can also be the same. The other structures of the second embodiment are basically the same as those of the first embodiment, and are not repeated here.

It should be noted that the matching structure of the plug-in circuit breaker and the pulling mechanism 1 in this embodiment is not only suitable for single-pole plug-in circuit breakers, but also for multi-pole plug-in circuit breakers. The multi-pole plug-in circuit breaker includes a plurality of circuit breaker poles arranged side by side, and each circuit breaker pole includes a circuit breaker casing 4, that is, the plurality of circuit breaker casings 4 shown in FIG. Each circuit breaker casing 4 includes elements such as an operating mechanism, a moving contact, a static contact, a protection mechanism, and a locking mechanism 2; The circuit breaker casings 4 of the circuit breaker poles are arranged side by side, the side walls of the adjacent circuit breaker casings 4 are in close contact, and the sliding holes are correspondingly arranged, and the operating members 3 of the plurality of circuit breaker poles are linked together.

The driving structure of the pulling mechanism 1 penetrates through the sliding holes of the multiple circuit breaker casings 4, synchronously drives the locking mechanisms 2 in the multiple circuit breaker casings 4 to synchronously unlock, and synchronously pulls the multiple circuit breaker poles from the cabinet. out. An embodiment is that the pulling mechanism 1 includes a pulling member 10 and a pulling linkage member, the pulling linkage member is a long-length linkage rod, and the one pulling linkage member penetrates through a plurality of sliding holes. Each circuit breaker casing 4 is connected to the pulling member 10 , and of course the length of the corresponding operating rod 105 is also longer, which is slightly larger than the sum of the widths of the plurality of circuit breaker casings 4 . The drawing linkage and the driving protruding rod 101 together serve as a driving structure, and both ends of the drawing linkage are connected with the driving protruding rods 101 at both ends of the drawing member 10, or the drawing linkage and the driving protruding rod 101 are integrated, By pulling the linkage, the locking mechanism 2 of the multi-pole plug-in circuit breaker can be driven to unlock at the same time, and the multi-pole plug-in circuit breaker can be pulled out from the cabinet. The pulling linkage member and the pulling member 10 may be integrally formed. Of course, in order to facilitate the assembly, the pulling linkage can also be an independent component with the pulling member 10, and then assembled and connected together. The puller linkage can also be connected to the puller element 10 by means of a plug connector. Depending on the circuit breaker for two-pole, three-pole, four-pole or more poles, it is possible to replace the corresponding pull-out piece 10 and the pull-out linkage from the outside, for matching plug-in circuit breakers with different numbers of poles, to be able to switch on the outside Replacing the corresponding drawing mechanism 1 enables the drawing mechanism 1 to form an integrated structure, which is easy to install and replace.

It should be noted that the above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

It should be noted that, in the description of the present invention, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the drawings The orientation or positional relationship of the device, or the orientation or positional relationship that is usually placed in use, is only for the convenience of description, rather than indicating that the referred device or element must have a specific orientation, so it should not be understood as a limitation of the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the descriptions and should not be construed as indicating relative importance.

Claims (14)

1. A plug-in circuit breaker, comprising a circuit breaker housing (4) and a locking mechanism (2) arranged in the circuit breaker housing (4), the locking mechanism (2) comprising a circuit breaker housing capable of extending out (4) The locking protrusions in the outer and retracted circuit breaker housing (4) are characterized in that: it also includes a pulling mechanism (1) for applying a pulling force to the plug-in circuit breaker, and is located in the circuit breaker housing. At least one side wall of (4) is provided with a sliding hole, and the pulling mechanism (1) includes a driving structure extending from the outside of the circuit breaker casing (4) into the circuit breaker casing (4) through the sliding hole. The structure can slide in the sliding hole, and the locking mechanism (2) is driven to retract the locking protrusion (24) into the circuit breaker housing (4), so as to pull out the plug-in circuit breaker. 2 . The plug-in circuit breaker according to claim 1 , wherein the circuit breaker housing ( 4 ) comprises an operation surface and a rear end surface arranged oppositely, an upper side wall and a lower side wall oppositely arranged, and an opposite side wall. 3 . The two side walls provided are provided with an operating member (3) for driving the circuit breaker to open and close on the operating surface, a locking hole is provided on the upper side wall and/or the lower side wall, and the locking protrusion (24) Protruding from the locking hole, the sliding holes are provided on both side walls. 3 . The plug-in circuit breaker according to claim 2 , wherein the sliding hole is elongated, and its length direction is parallel to the direction in which the plug-in circuit breaker is inserted into the cabinet and perpendicular to the plane where the operation surface is located. 4 . 4. The plug-in circuit breaker according to claim 1, wherein the drawing mechanism (1) comprises an operating structure, a driving structure and a connecting structure connected between the operating structure and the driving structure, the operating structure For applying the pulling force, at least one side wall of the circuit breaker housing (4) is further provided with a first accommodating groove (133) for accommodating the connection structure of the pulling mechanism (1), so that the connection structure Not protruding from the side wall of the circuit breaker housing (4), the sliding hole is arranged in the first accommodating groove (133). 5 . The plug-in circuit breaker according to claim 4 , wherein a second accommodating groove ( 135 ) is provided on the operating surface of the circuit breaker housing ( 4 ) for accommodating at least part of the operating structure. 6 . 6. The plug-in circuit breaker according to claim 1, characterized in that: the driving structure comprises a driving protruding rod (101), and the driving protruding rod (101) extends into the inside of the circuit breaker housing (4) from the sliding hole, The locking mechanism (2) is directly or indirectly driven to retract the locking projection (24) into the circuit breaker housing (4). 7 . The plug-in circuit breaker according to claim 1 , wherein the locking mechanism ( 2 ) comprises a locking piece ( 20 ), and the locking piece ( 20 ) is rotatably or slidably installed on the circuit breaker housing ( 7 . 4) Inside, the locking member (20) is provided with a locking protrusion (24), and the elastic member (23) drives the locking member (20) to move so that the locking protrusion (24) protrudes out of the circuit breaker housing (4) . 8 . The plug-in circuit breaker according to claim 7 , wherein the middle part of the locking member ( 20 ) is rotatably installed in the circuit breaker housing ( 4 ), and the locking protrusion is protruded from the upper side of one end. 9 . The other end protrudingly extends a driving arm, the driving arm extends to the sliding path of the driving structure, and the elastic member (23) drives the locking member (20) to rotate so that the locking protrusion (24) extends out of the circuit breaker Outside the casing (4), the driving structure slides through the driving arm to drive the locking piece (20) to rotate, so that the locking protrusion (24) is retracted into the circuit breaker casing (4). 9 . The plug-in circuit breaker according to claim 7 , wherein the locking member ( 20 ) is linearly slidably arranged in the circuit breaker housing ( 4 ), and the elastic member ( 23 ) drives the locking member ( 20 ) linearly. 10 . The locking protrusion (24) protrudes out of the circuit breaker housing (4) by sliding, and the locking mechanism (2) further comprises an unlocking lever (21), one end of the unlocking lever (21) is hinged with the locking piece (20), and the unlocking lever (21) The other end is located on the sliding path of the driving structure, and the sliding of the driving structure drives the unlocking lever (21) to rotate and then drives the locking member (20) to slide, so that the locking protrusion (24) retracts into the circuit breaker housing (4). 10. The plug-in circuit breaker according to claim 1, characterized in that: the pulling mechanism (1) comprises a pulling piece (10), and the pulling piece (10) comprises an operating rod (105) and two There are connecting rods (103), one end of the two connecting rods (103) is respectively connected with the operating rod (105), and the ends of the two connecting rods (103) are bent toward each other and provided with a driving protruding rod (101) as a driving structure . 11. The plug-in circuit breaker according to claim 1, characterized in that: the circuit breaker housing (4) is further provided with a reset member (12) for driving the drawing mechanism (1) to reset. 12. The plug-in circuit breaker according to claim 2, characterized in that: the drawing mechanism (1) comprises an operating structure, a driving structure and a connecting structure connected between the operating structure and the driving structure, the operating structure Corresponding to the operating surface setting of the circuit breaker housing (4), the operating member (3) is a handle, which shields the operating structure when the handle is rotated to the closing position, and avoids the operating structure when rotated to the opening position. 13. The plug-in circuit breaker according to any one of claims 1-12, characterized by comprising a plurality of circuit breaker poles, each circuit breaker pole comprising a circuit breaker housing (4), the circuit breaker housing (4) The sliding holes are provided on both side walls of the ), the circuit breaker housings (4) of a plurality of circuit breaker poles are arranged side by side and the sliding holes are correspondingly arranged; the driving structure of the drawing mechanism (1) penetrates through the plurality of circuit breakers The sliding holes of the circuit breaker casings (4) are synchronously driven to unlock the locking mechanisms (2) in the multiple circuit breaker casings (4) synchronously, and the multiple circuit breaker poles are pulled out from the cabinet synchronously. 14. The plug-in circuit breaker according to claim 13, characterized in that: the pulling mechanism (1) comprises a pulling member (10) and a pulling linkage as a driving structure, and the pulling linkage penetrates through The sliding holes of a plurality of circuit breaker housings (4), and the pulling linkage parts are connected with the pulling parts (10).

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