CN215869202U

CN215869202U - Plug-in circuit breaker

Info

Publication number: CN215869202U
Application number: CN202121591344.6U
Authority: CN
Inventors: 卢科军
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2022-02-18
Anticipated expiration: 2031-07-13

Abstract

The utility model provides a plug-in circuit breaker, includes the shell and sets up L utmost point circuit and the N utmost point circuit in the shell the one end of shell is equipped with button hole and wiring mouth the button downthehole sliding fit has operating button be provided with indicating device in the shell, indicating device includes light emitting component and sets up the instruction hole in button hole and wiring mouth one side, light emitting component's both ends are connected with L utmost point circuit, N utmost point circuit electricity respectively, and light emitting component's luminous state sees through the instruction hole and is used for instructing the terminal side charged state of circuit breaker. According to the plug-in circuit breaker, the indicating device is connected between the L-pole circuit and the N-pole circuit, when the circuit breaker is switched on and switched off, the luminous element feeds back whether the terminal side is electrified or not through the indicating hole, so that a user can know whether the circuit breaker can be operated or not by observing the indicating hole, the improvement of overhauling or replacing efficiency is facilitated, and the use safety of the circuit breaker is ensured.

Description

Plug-in circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus, in particular to a plug-in circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying and breaking a current under a normal circuit condition and closing, carrying and breaking a current under an abnormal circuit condition within a prescribed time, and is generally classified into a plug-in type, a fixed type and a drawer type circuit breaker according to its installation manner. At present, plug-in circuit breaker assembles usually in the rack, when the circuit when breaking down need overhaul or change the inefficacy circuit breaker, need investigate one by one and judge that the fault circuit breaker is comparatively loaded down with trivial details, so can consume a large amount of time and energy, influence maintenance or change efficiency, in addition, when circuit breaker load side connection capacitive load, live working binding post wire can have great potential safety hazard.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a plug-in circuit breaker capable of indicating whether a terminal side is electrified or not.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a plug-in circuit breaker, includes the shell and sets up L utmost point circuit and the N utmost point circuit in the shell the one end of shell is equipped with button hole and wiring mouth the button downthehole sliding fit has operating button be provided with indicating device in the shell, indicating device includes light emitting component and sets up the instruction hole in button hole and wiring mouth one side, light emitting component's both ends are connected with L utmost point circuit, N utmost point circuit electricity respectively, and light emitting component's luminous state sees through the instruction hole and is used for instructing the terminal side charged state of circuit breaker.

Furthermore, at least two breaker poles are arranged in parallel in the shell, an N-pole line is arranged in one breaker pole, an L-pole line is arranged on the rest breaker poles as L-phase poles, and an indicating device is arranged in only one breaker pole.

Further, at least two breaker poles are arranged in the shell in parallel, one breaker pole is provided with an N pole line as an N phase pole, the rest breaker poles are provided with L pole lines as L phase poles, and each breaker pole is provided with an indicating device.

Furthermore, the indicating device also comprises a circuit board, and the light-emitting element is electrically connected with the L-pole circuit and the N-pole circuit through the circuit board.

Furthermore, the light-emitting element is a light-emitting diode, the indicating device further comprises a rectifier diode and at least one current-limiting resistor, the anode of the rectifier diode is connected with the L-pole line, the cathode of the rectifier diode is connected with the anode of the light-emitting diode, and the light-emitting diode is connected with the current-limiting resistor in series.

Further, the indicating device further comprises an anti-surge device, and the anti-surge device is connected with the light-emitting element in parallel.

Furthermore, the indicating device further comprises a light guide piece, the light guide piece is arranged between the indicating hole and the light-emitting element, and the light guide piece reflects the light-emitting state of the light-emitting element to the indicating hole.

Furthermore, the light guide piece comprises a light guide column, an irradiation surface and a reflection surface connected between the light guide column and the irradiation surface, the central axis of the irradiation surface is perpendicular to the central axis of the light guide column, the irradiation surface is opposite to the light emitting element, and light generated by the light emitting element is reflected to the light guide column inserted in the indicating hole through the reflection surface.

Further, the inboard of shell still is equipped with the spacing groove, and the leaded light spare still is including setting up the spacing boss in leaded light post one side, spacing boss and spacing groove cooperation make the leaded light spare by spacing the installation in the shell.

Furthermore, a through hole is formed in an operating button of each circuit breaker pole, an indicating piece is rotatably assembled in the through hole, and the operating button is pressed to enable the indicating piece to swing in the through hole so as to indicate the switching-on and switching-off states of the circuit breaker.

Furthermore, a control circuit board is arranged in the shell and connected with the circuit board, or a light-emitting element is arranged on the control circuit board.

Furthermore, be provided with the through-hole on operating button the through-hole internal rotation is equipped with the indicator, presses operating button and makes the indicator swing in the through-hole in order to instruct the divide-shut brake state of circuit breaker, is equipped with outlet terminal in the wiring mouth of operating button one side, indicating device is connected with the outlet terminal electricity of L utmost point circuit and N utmost point circuit respectively and is used for instructing the electrified state of outlet terminal side of circuit breaker.

According to the plug-in circuit breaker, the indicating device is connected between the L-pole circuit and the N-pole circuit, when the circuit breaker is switched on and switched off, the luminous element feeds back whether the terminal side is electrified or not through the indicating hole, so that a user can know whether the circuit breaker can be operated or not by observing the indicating hole, the improvement of overhauling or replacing efficiency is facilitated, and the use safety of the circuit breaker is ensured.

In addition, a mechanical indicating piece is arranged on the operating button, the indicating piece can swing to indicate the switching-on and switching-off states of the circuit breaker by pressing the operating button, so that the indicating piece and the electronic indicating device are matched with each other to form two mutually independent indicating devices, one indicating device is used for indicating the switching-on and switching-off states of the circuit breaker, and the other indicating device is used for indicating whether the terminal side is electrified or not, so that a user can conveniently observe the states of the circuit breaker.

In addition, the indicating device consists of a circuit board and light emitting diodes arranged on the circuit board, wiring is simplified, occupied space in the indicating device is small, and in addition, anti-surge devices are connected in parallel at two ends of the light emitting diodes, so that the anti-surge capacity of the light emitting diodes is improved.

In addition, only one indicating device can be arranged in the multi-pole circuit breaker according to actual needs, a mechanical indicating piece is arranged in each breaker pole of the multi-pole circuit breaker, whether the terminal side is electrified or not is determined through the indicating device, and the opening and closing state of each breaker pole is indicated through the indicating piece.

Drawings

Fig. 1 is a schematic view of a structure of a plug-in type circuit breaker of the present invention;

fig. 2 is a circuit diagram of an indicating device in a plug-in circuit breaker according to the present invention;

fig. 3 is a schematic structural view of an indicating device in a plug-in type circuit breaker according to the present invention;

fig. 4 is a schematic structural view of a plug-in circuit breaker according to the present invention with the indicating device removed;

fig. 5 is a schematic view of the position of an L-pole terminal in a plug-in circuit breaker according to the present invention;

fig. 6 is a schematic view of the position of an N-pole terminal in a plug-in circuit breaker according to the present invention;

fig. 7-8 are schematic views of a second conductive member in a plug-in circuit breaker of the present invention;

fig. 9 is a schematic structural view of an indicating hole and a limiting groove in a plug-in circuit breaker according to the present invention;

FIG. 10 is a schematic diagram of a light-emitting device, a light-guiding device and a circuit board of a plug-in circuit breaker according to the present invention;

fig. 11 is a schematic structural diagram of a light guide in a plug-in circuit breaker according to the present invention.

Detailed Description

The following describes a plug-in circuit breaker according to an embodiment of the present invention with reference to the embodiments shown in fig. 1 to 11. A plug-in type circuit breaker of the present invention is not limited to the description of the following embodiments.

A plug-in circuit breaker comprises a shell 1, an L pole line and an N pole line, wherein the L pole line and the N pole line are arranged in the shell 1, a button hole and a wiring port are formed in one end of the shell 1, an operating button 2 is assembled in the button hole in a sliding mode, an indicating device 3 is arranged in the shell 1, the indicating device 3 comprises a light-emitting element 32 and an indicating hole 13 formed in one side of the button hole and the wiring port, two ends of the light-emitting element 32 are electrically connected with the L pole line and the N pole line respectively, and the light-emitting state of the light-emitting element 32 penetrates through the indicating hole 13 and is used for indicating the terminal side charged state of the circuit breaker.

According to the plug-in circuit breaker, the indicating device 3 is connected between the L-pole circuit and the N-pole circuit, when the circuit breaker is switched on and switched off, the light-emitting element 32 feeds back whether the terminal side is electrified or not through the indicating hole 13, so that a user can know whether the circuit breaker can be operated or not by observing the indicating hole 13, the maintenance or replacement efficiency is improved, and the use safety of the circuit breaker is ensured.

A detailed embodiment is provided in connection with fig. 1-11, said plug-in circuit breaker comprising a housing 1, at least one circuit breaker pole is arranged in the shell 1, two ends of each circuit breaker pole are respectively provided with a wiring port, one of the wiring ports is used as a wire inlet, the other wiring port is used as a wire outlet, a wire inlet terminal and a wire outlet terminal are respectively and correspondingly arranged on the wire inlet and the wire outlet, an operating mechanism, a contact mechanism and an arc extinguish chamber are arranged between the incoming terminal and the outgoing terminal, the contact mechanism is respectively electrically connected with the incoming line terminal and the outgoing line terminal, the operating mechanism is linked with the contact mechanism and is used for driving the contact mechanism to open and close, the arc extinguishing chamber is positioned on one side of the contact mechanism and used for extinguishing electric arcs generated when the contact mechanism is broken. In addition, a protection mechanism can be arranged between the incoming line terminal and the outgoing line terminal, the protection mechanism is matched with the operating mechanism, and the protection mechanism can be a short-circuit protection mechanism and/or an overload protection mechanism and is used for triggering the operating mechanism to release and power off when a main line has a short-circuit or overload fault.

One end of the breaker pole is provided with a button hole, the button hole is positioned on one side of the wiring port, an operating button 2 is assembled in the button hole in a sliding mode, one end of the operating button 2 is positioned on the outer side of the button hole, and the other end of the operating button extends into the shell 1 and is used for being connected with an operating mechanism in a linkage mode to achieve switching-on and switching-off of the manually operated breaker pole. Further, operating button 2 includes the button, the middle part of button is equipped with the through-hole internal rotation is equipped with indicator (not shown), when pressing operating button 2, the one end of indicator is through cooperating with the through-hole inner wall or passing through-hole and 1 inner wall of shell, makes the other end swing in the through-hole of indicator be used for instructing the divide-shut brake state of circuit breaker, all is provided with an indicator preferably in operating button 2 of every circuit breaker utmost point, also can a plurality of circuit breaker utmost points shared indicator certainly, with the simplified assembly, this belongs to prior art and no longer gives unnecessary details.

As shown in fig. 1, in the present embodiment, three breaker poles are arranged in parallel in the housing 1, two adjacent breaker poles are separated by a partition 15 (see fig. 4), wherein an L-pole line is provided as an L-phase pole in two breaker poles, an L-pole line and an N-pole line are provided in the remaining breaker poles at the same time, two connection ports are provided at both ends of the breaker pole, two connection ports at the same end are arranged in a staggered manner, one of the connection ports is an N-pole connection port 12, a connection terminal corresponding to the N-pole connection port 12 is an N-pole connection terminal 42, the other connection port is an L-pole connection port 11, a connection terminal corresponding to the L-pole connection port 11 is an L-pole connection terminal 41, and preferably, a partition 15 (see fig. 8 and 9) is also provided between the L-pole line and the N-pole line for separation. Of course, an N-pole line may be provided in one of the breaker poles to form an independent N-phase pole.

As shown in fig. 2-6 and 9-10, the present embodiment is further provided with an indicating device 3 for indicating whether the terminal side of the circuit breaker is charged or not in the housing 1, preferably, the indicating device 3 is arranged at one end of the circuit breaker pole and is located at one side of the terminal and the operation button 2, the indicating device 3 comprises a light emitting element 32, a light guiding member 33 and an indicating hole 13 arranged at one side of the wiring port and the button hole, two ends of the light emitting element 32 are electrically connected with the L-pole line and the N-pole line respectively, that is, two ends of the light emitting element 32 are connected with the L-pole terminal 41 and the N-pole terminal 42 respectively, the light guiding member 33 is arranged between the indicating hole 13 and the light emitting element 32, whether the terminal side of the circuit breaker is charged or not can be obtained by observing the indicating hole 13, of course, the light guiding member 33 can be omitted, the light emitting state of the light emitting element 32 is directly fed back to the outside through the indicating hole 13. Whether the terminal side of the circuit breaker is electrified or not means whether the wiring terminal of the circuit breaker is electrified or not, that is, whether the L-pole wiring terminal 41 and the N-pole wiring terminal 42 are electrified or not.

In this embodiment, the indicating device 3 and the operating button 2 are located at the same end, the indicating device 3 takes electricity from the wiring terminal at the same end as the operating button 2, and therefore is used for indicating whether the wiring terminal close to the operating button 2 is electrified or not, in this embodiment, the wiring port at the same end as the operating button 2 is used as an outlet port, an outlet terminal is arranged in the outlet port, correspondingly, the L-pole wiring terminal 41 and the N-pole outlet terminal 42 at the same end as the operating button 2 are respectively an L-pole outlet terminal and an N-pole outlet terminal, that is, a load-side wiring terminal of the circuit breaker, and two ends of the indicating device 3 are respectively electrically connected with the outlet terminals of the L-pole line and the N-pole line, that is, two ends of the indicating device 3 are respectively electrically connected with the L-pole outlet terminal and the N-pole outlet terminal, and are used for indicating whether the load-side wiring terminal of the circuit breaker is electrified or not; and a wiring port at one end opposite to the operating button 2 is used as a wire inlet, a wire inlet terminal is arranged at the wire inlet, and the wiring terminals corresponding to the L-phase pole and the N-phase pole are respectively an L-pole wire inlet terminal and an N-pole wire inlet terminal. Of course, the indicating device 3 may be made to take power from the incoming line terminal, and at this time, the indicating device 3 is used to indicate whether the incoming line terminal of the circuit breaker is charged or not.

As another embodiment, the indicating device 3 is only arranged in one of the breaker poles, preferably in the L-phase pole located at the middle position, the indicating device 3 is located between the connection ports of two adjacent breaker poles, and the aperture of the indicating hole 13 is as small as possible, so that by reducing the arrangement of the indicating device 3, the manufacturing process can be simplified, and the cost can be reduced, of course, the indicating device 3 may also be arranged between two adjacent breaker poles, for example, between two L-phase poles or between an L-phase pole and an N-phase pole, and it may also indicate whether the outlet terminal side or the inlet terminal side of the breaker is charged or not.

Of course, the switching-on/off state of the circuit breaker can also be indicated through the indicating device 3, taking the case that the indicating device 3 is connected to the outgoing line terminal as an example, when the load side of the circuit breaker is connected with the non-capacitive load, the live line of the connecting terminal side indicates that the circuit breaker is in the switching-on state, and the neutral line of the connecting terminal side indicates that the circuit breaker is switched off.

However, when the load side of the circuit breaker is connected to the capacitive load, the indication of the indicating device 3 is not completely the same as the switching-on/off state, and when the connection terminal side is not charged, it indicates that the circuit breaker is in the switching-off state, but when the connection terminal side is in the charged state, the circuit breaker may be in the switching-on state, or may be just after the switching-off is completed, the capacitive load is still discharging, and at this time, the circuit breaker is already switched off, but the connection terminal is still charged, and the circuit breaker should not be operated. At this time, preferably, each operation button 2 is further provided with a mechanical indicator, each indicator is used for indicating the switching-on/off state of the circuit breaker, so that the indicator is used for indicating the switching-on/off state of the circuit breaker, and the indicating device 3 is used for indicating whether the terminal side is electrified or not, thereby facilitating a user to observe the state of the circuit breaker.

As shown in fig. 2 and 10, the indicating device 3 includes a circuit board 31, the light emitting element 32 is a light emitting diode D3, the light emitting diode D3 is disposed on the circuit board 31 and connected to the L-pole line and the N-pole line through the circuit board 31, preferably, a first conductive member 311 and a second conductive member 312 are disposed on the circuit board 31, in this embodiment, the first conductive member 311 and the second conductive member 312 are elastic conductive members, and fig. 3-8 are spring structures, the first conductive member 311 is used for connecting to the L-pole line, i.e. electrically connected to the L-pole terminal 41 (L-pole outgoing terminal) through a partition 15, the second conductive member 312 is used for connecting to the N-pole line, i.e. electrically connected to the N-pole terminal 42 (N-pole outgoing terminal) through the partition 15, so as to indicate whether the terminal side of the circuit breaker is charged or not by the light emitting state of the light emitting diode D3, for example, the light emitting diode D3 being off indicates that the terminal side of the circuit breaker is not charged, and the light emitting element 32 being on indicates that the terminal side of the circuit breaker is charged.

The specific indication process is that when the load side of the circuit breaker is connected with the non-capacitive load, the indication device 3 can also indicate the switching-on/off state of the circuit breaker, that is, when the circuit breaker is switched off, the terminal side of the circuit breaker is not electrified, the light-emitting element 32 is extinguished, when the circuit breaker is switched on, the terminal side of the circuit breaker is electrified, and the light-emitting element 32 is normally lit; when the load side of the circuit breaker is connected with a capacitive load, after the circuit breaker is switched on, the terminal side is electrified, the light-emitting element 32 is normally on, when the circuit breaker is just switched off, the discharge of the capacitive load enables the light-emitting element 32 to be normally on within a certain time, at the moment, the circuit breaker cannot be operated, at one end time after the circuit breaker is switched off, the discharge of the capacitive load is completed, the terminal side is not electrified, and the light-emitting element 32 is extinguished, therefore, when the load side of the circuit breaker is connected with the capacitive load, the light-emitting element 32 is extinguished to indicate that the circuit breaker is switched off, the terminal side is not electrified, the light-emitting element 32 is in a luminous state, and the terminal side is electrified, at the moment, the state of the circuit breaker is judged by preferably matching with a mechanical indicator, and certainly, when the light-emitting element 32 is in a luminous state for a long time, the circuit breaker can also be indicated to be in a switched on state.

Further, as shown in fig. 2, the indicating device 3 further includes a rectifying diode D1 connected in series with the light emitting diode D3, and at least one current limiting resistor R, wherein an anode of the rectifying diode D1 is connected to the L-line, a cathode of the rectifying diode D1 is connected to an anode of the light emitting diode D3, and a cathode of the light emitting diode D3 is connected to the N-line through the current limiting resistor R. In addition, two ends of the led D3 are connected in parallel with an anti-surge device, and in this embodiment, the anti-surge device is connected in parallel with the transient suppression diode D2 at two ends of the led D3, so as to improve the anti-surge capability of the led D3.

The light guide 33 is opposite to the light emitting element 32, preferably, a limiting groove 14 is provided in the housing 1, the limiting groove 14 is located at one side of the indicating hole 13 and is used for limiting and installing the light guide 33 inside the housing 1, of course, the light guide 33 may be fixed in the housing 1 in other manners, for example, the light guide 33 is bonded in the housing 1. As shown in fig. 11, the light guide 33 includes a light guide column 331, an irradiation surface 332, and a reflection surface 333 connected between the light guide column 331 and the irradiation surface 332, the irradiation surface 332 is opposite to the light emitting element 32, so that light generated by the light emitting element 32 is reflected to the light guide column 331 through the reflection surface 333, preferably, a central axis of the irradiation surface 332 is perpendicular to a central axis of the light guide column 331, so as to reduce multiple reflections of the light in the light guide 33 as much as possible, which affects an indication state, a limit boss 334 is disposed on one side of the light guide column 331, and the limit boss 334 is matched with a limit groove 14 in the housing 1, so that the light guide column 331 can be stably inserted into the indication hole 13, and thus, the state of the light emitting element 32 can be reflected into the indication hole 13. Of course, a protrusion structure may be disposed on the light guide column 331 to prevent the light guide column 331 from being separated from the indication hole 13 when the light guide column 331 is inserted into and engaged with the indication hole, and at this time, the limiting groove 14 disposed on the housing 1 may be omitted, but the protrusion structure may interfere with the indication effect.

Still be provided with the drive module who is used for driving the automatic divide-shut brake of circuit breaker in one of them circuit breaker utmost point, drive module includes control scheme board and by control scheme board driven electric manipulation module, electric manipulation module is connected through the operating device linkage with a circuit breaker utmost point and is used for realizing the automatic divide-shut brake of circuit breaker, electric manipulation module includes motor and drive gear, and the motor passes through drive gear and is connected with the operating device meshing.

As another embodiment, the indicating devices 3 are disposed in the plurality of breaker poles disposed in the housing 1, the indicating devices 3 are disposed on the side of the operation buttons 2 and the connection terminals of the breaker poles, in this embodiment, the connection terminals on the side of the operation buttons 2 are also outlet terminals, the indicating devices 3 include the same circuit board 31 as the above embodiment, and the light emitting elements 32, the current limiting resistors R and the rectifier diodes D1 disposed on the circuit board 31, each indicating device 3 draws power from the L-pole line and the N-pole line through the circuit board 31, in addition, a through hole is disposed on each operation button 2, the same indicating member as the above embodiment is disposed in the through hole, so that the switching state of each breaker pole can be accurately indicated, of course, when the breaker includes only one breaker pole, the indicating devices 3 can also be disposed in the L-pole line and the N-pole line within the breaker pole, if the circuit breaker pole further comprises a driving module for driving the circuit breaker to automatically switch on and off, the circuit board 31 of the indicating device 3 may be replaced by a control circuit board (not shown) in the driving module, and the light-emitting element 32, the rectifier diode D2, the current-limiting resistor R, the first conductive member 311, the second conductive member 312, and the anti-surge device are disposed on the control circuit board, or the circuit board 31 is connected with the control circuit board for feeding back signals to the control circuit board.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. A plug-in circuit breaker, includes shell (1) and sets up L utmost point circuit and the N utmost point circuit in shell (1) the one end of shell (1) is equipped with button hole and wiring mouth the button downthehole slip be equipped with operating button (2), its characterized in that: an indicating device (3) is arranged in the shell (1), the indicating device (3) comprises a light-emitting element (32) and an indicating hole (13) arranged on one side of the button hole and the wiring port, two ends of the light-emitting element (32) are respectively electrically connected with the L-pole circuit and the N-pole circuit, and the light-emitting state of the light-emitting element (32) is used for indicating the terminal side charged state of the circuit breaker through the indicating hole (13).

2. A plug-in circuit breaker as claimed in claim 1, characterized in that: at least two breaker poles are arranged in parallel in the shell (1), an N-pole line is arranged in one breaker pole, an L-pole line is arranged as an L-phase pole in the rest breaker poles, and an indicating device (3) is arranged in only one breaker pole.

3. A plug-in circuit breaker as claimed in claim 1, characterized in that: at least two breaker poles are arranged in parallel in the shell (1), one breaker pole is provided with an N pole line as an N phase pole, the rest breaker poles are provided with an L pole line as an L phase pole, and an indicating device (3) is arranged in each breaker pole.

4. A plug-in circuit breaker according to any one of claims 1 to 3, characterized in that: the indicating device (3) further comprises a circuit board (31), and the light-emitting element (32) is electrically connected with the L-pole circuit and the N-pole circuit through the circuit board (31).

5. A plug-in circuit breaker as claimed in claim 4, characterized in that: the indicating device (3) further comprises a rectifier diode and at least one current-limiting resistor, wherein the anode of the rectifier diode is connected with the L-line circuit, the cathode of the rectifier diode is connected with the anode of the light-emitting diode, and the light-emitting diode is connected with the current-limiting resistor in series.

6. A plug-in circuit breaker as claimed in claim 4, characterized in that: the indicating device (3) further comprises an anti-surge device connected in parallel with the light emitting element (32).

7. A plug-in circuit breaker as claimed in claim 1, characterized in that: the indicating device (3) further comprises a light guide piece (33), the light guide piece (33) is arranged between the indicating hole (13) and the light-emitting element (32), and the light guide piece (33) reflects the light-emitting state of the light-emitting element (32) to the indicating hole (13).

8. A plug-in circuit breaker as claimed in claim 7, characterized in that: the light guide piece (33) comprises a light guide column (331), an irradiation surface (332) and a reflection surface (333) connected between the light guide column (331) and the irradiation surface (332), the central axis of the irradiation surface (332) is perpendicular to the central axis of the light guide column (331), the irradiation surface (332) is opposite to the light emitting element (32), and light generated by the light emitting element (32) is reflected to the light guide column (331) inserted into the indicating hole (13) through the reflection surface (333).

9. A plug-in circuit breaker as claimed in claim 8, characterized in that: the inner side of the shell (1) is further provided with a limiting groove (14), the light guide piece (33) further comprises a limiting boss (334) arranged on one side of the light guide column (331), and the limiting boss (334) is matched with the limiting groove (14) to enable the light guide piece (33) to be limited and installed in the shell (1).

10. A plug-in circuit breaker as claimed in claim 2, characterized in that: the operating button (2) of each circuit breaker pole is provided with a through hole, an indicating piece is rotationally assembled in the through hole, and the operating button (2) is pressed to enable the indicating piece to swing in the through hole so as to indicate the opening and closing states of the circuit breaker.

11. A plug-in circuit breaker as claimed in claim 4, characterized in that: and a control circuit board is also arranged in the shell (1), and the control circuit board is connected with the circuit board (31), or a light-emitting element (32) is arranged on the control circuit board.

12. A plug-in circuit breaker as claimed in claim 1, characterized in that: be provided with the through-hole on operating button (2) the through-hole internal rotation is equipped with the indicator, presses operating button (2) and makes the indicator swing in the through-hole in order to instruct the divide-shut brake state of circuit breaker, is equipped with outlet terminal in the wiring mouth of operating button (2) one side, indicating device (3) are connected with the outlet terminal electricity of L utmost point circuit and N utmost point circuit respectively and are used for instructing the electrified state of outlet terminal side of circuit breaker.