CN217239371U - Switching-on and switching-off mechanism and miniature circuit breaker - Google Patents

Abstract

The utility model relates to a divide-shut brake mechanism and miniature circuit breaker. This divide-shut brake mechanism is used for miniature circuit breaker to include: the operating mechanism comprises a handle, a lock catch connected to the handle, a jump buckle capable of being locked or unlocked with the lock catch, and a contact support for supporting the lock catch and the jump buckle; two movable contacts, each pivotally mounted to the contact mount; the closing actuating mechanism comprises a closing coil and a movable closing armature surrounded by the closing coil, the closing armature is connected to the operating mechanism in a driving mode, and the closing coil is provided with a control circuit board connecting terminal; the brake separating actuating mechanism comprises a brake separating coil and a movable brake separating armature surrounded by the brake separating coil, and the brake separating armature is arranged corresponding to the trip and can move to drive the trip to be unlocked with the lock catch.

Description

Switching-on and switching-off mechanism and miniature circuit breaker

Technical Field

The utility model relates to a circuit protection technical field especially relates to divide-shut brake mechanism and miniature circuit breaker.

Background

The existing Miniature Circuit Breaker (MCB) usually has only short circuit and overload protection functions, and for some occasions requiring earth leakage protection or remote operation, the conventional MCB cannot meet the use requirements. The current solution is to connect the MCB with other functional devices (such as a remote operation switch, a residual current operated circuit breaker (RCBO)), etc. to form a circuit breaker capable of meeting various functional requirements. However, such circuit breakers assembled together are generally bulky, and in particular have a large thickness, which does not meet the current demand for miniaturization of electrical components. In addition, when assembling such a circuit breaker, it is necessary to connect the functional devices one by one, and during this period, attention must be paid to the wiring sequence, and if the line connection is wrong, irreparable loss will be caused to the whole circuit. This complicated assembly procedure is also time consuming and labor intensive.

Therefore, there is a need in the industry to improve the internal structure of a miniature circuit breaker to make the miniature circuit breaker smaller in size and more time-saving and labor-saving in operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an divide-shut brake mechanism for miniature circuit breaker that can solve above-mentioned partial technical problem at least.

The utility model discloses still aim at providing the miniature circuit breaker who uses above-mentioned modified divide-shut brake mechanism.

According to the utility model discloses an aspect provides an divide-shut brake mechanism for miniature circuit breaker, include: the operating mechanism comprises a handle, a lock catch connected to the handle, a jump buckle capable of being locked or unlocked with the lock catch, and a contact support for supporting the lock catch and the jump buckle; two movable contacts, each pivotally mounted to the contact mount; the closing actuating mechanism comprises a closing coil and a movable closing armature surrounded by the closing coil, the closing armature is connected to the operating mechanism in a driving mode, and the closing coil is provided with a control circuit board connecting terminal; the brake separating actuating mechanism comprises a brake separating coil and a movable brake separating armature iron surrounded by the brake separating coil, and the brake separating armature iron is arranged corresponding to the tripping buckle and can move to drive the tripping buckle to be unlocked with the locking buckle.

In some embodiments, the two movable contacts include a first movable contact and a second movable contact pivotally mounted on opposite sides of the contact support, respectively, and the first movable contact has an over travel less than the over travel of the second movable contact.

In some embodiments, the contact support has a first pin and a second pin that are coaxial on opposite sides, wherein an outer diameter of the first pin is greater than an outer diameter of the second pin, and the first movable contact and the second movable contact are pivotally connected coaxially on the opposite sides of the contact support, and the first movable contact has a first arcuate segment that extends around an outer peripheral surface of the first pin, and the second movable contact has a second arcuate segment that extends around an outer peripheral surface of the second pin, wherein the first arcuate segment has the same arc as the second arcuate segment.

In some embodiments, a moving contact torsion spring is connected between the contact support and the two moving contacts, the moving contact torsion spring applies a force to the corresponding moving contact to move the corresponding moving contact along a closing direction, and the forces applied by the two moving contact torsion springs are different.

In some embodiments, the opening coil includes a first opening coil surrounding the opening armature, the first opening coil having a control circuit board connection terminal.

In some embodiments, the opening coil includes a second opening coil surrounding the first opening coil, the second opening coil having an engagement portion for electrically connecting to a load terminal of the miniature circuit breaker.

In some embodiments, the handle has a tooth structure, and the closing armature is provided with a rack, and a transmission gear is engaged between the tooth structure and the rack.

In some embodiments, the drive gear comprises a first gear and a second gear coupled, wherein the first gear is engaged with the rack and the second gear is engaged with the tooth structure.

In some embodiments, the operating mechanism further comprises an indicator plate having an arc-shaped groove, wherein a connecting pin shaft that pivotally connects the latch to the contact carrier is disposed through the arc-shaped groove and is movable along the arc-shaped groove.

According to an aspect of the present invention, there is provided another miniature circuit breaker, including: a housing; two-phase circuits installed in the housing, each of the two-phase circuits having a moving contact and a stationary contact; a switching on/off mechanism mounted in the housing; the switching-on and switching-off mechanism is the switching-on and switching-off mechanism, wherein the two moving contacts are respectively constructed as moving contacts in the two-phase circuit.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a schematic diagram of a miniature circuit breaker according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of an angle of a housing of a miniature circuit breaker according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of another angle of a housing of a miniature circuit breaker according to an embodiment of the present invention;

fig. 4 is a schematic view of the interior of the housing as seen from the first phase circuit in accordance with an embodiment of the present invention;

fig. 5 is a schematic view of the interior of the housing as seen from the second phase circuit in accordance with an embodiment of the present invention;

fig. 6 is a schematic view of an angle of an operating mechanism according to an embodiment of the present invention;

fig. 7 is a schematic view of another angle of an operating mechanism according to an embodiment of the present invention.

Description of reference numerals:

1. a housing; 11. a first half shell; 12. a second half shell; 121. a support wall; 122. a pivotal shaft; 13. a middle housing; 131. a first housing portion; 133. a recess; 132. a second housing portion; 2. an operating mechanism; 21. a handle; 211. a tooth structure; 212. a handle torsion spring; 213. an orifice; 22. a connecting rod; 23. locking; 24. jumping and buckling; 241. a jump buckle torsion spring; 25. a contact holder; 251. a contact carrier spring; 252. a first pin shaft; 253. a second pin shaft; 254. connecting a pin shaft; 26. a sign; 261. an arc-shaped slot; 3. a first phase circuit; 31. a first moving contact; 311. a first moving contact torsion spring; 312. a first arcuate segment; 32. a first fixed contact; 33. a first connection terminal; 331. a wire; 34. a second connection terminal; 341. a wire; 35. an arc extinguishing chamber; 36. a first current transformer; 4. a second phase circuit; 41. a second moving contact; 411. a second moving contact torsion spring; 412. a second arcuate segment; 42. a second fixed contact; 43. a third connection terminal; 44. a fourth connection terminal; 441. a wire; 5. a closing actuating mechanism; 51. a closing coil; 52. closing the armature; 521. a rack; 53. a transmission gear; 531. a first gear; 532. a second gear; 6. a brake-separating actuating mechanism; 61. a brake-separating armature iron; 62. a first opening coil; 63. a second opening coil; 7. a control circuit board; 8. testing the component; 81. a button; 82. a wire; 83. an elastic member; 84. a resistance; 9. second current transformer

Detailed Description

Referring now to the drawings, the schematic schemes of the micro circuit breaker and the opening and closing mechanism for the micro circuit breaker disclosed in the present invention are described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosure of the present invention. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Fig. 1 to 7 show a miniature circuit breaker according to an embodiment of the present invention. As shown in fig. 1, the micro circuit breaker accommodates an operating mechanism, a two-phase (1P + N) circuit and corresponding opening and closing actuating mechanisms, a controller, a current detecting device, etc. in an inner space defined by a single case 1. Thus, the micro circuit breaker module shown in fig. 1 can realize short circuit, overload and leakage protection functions and can be operated remotely, the width H of the micro circuit breaker module is less than or equal to 18 mm (namely less than or equal to 1 modulus), the structure is simple, and the volume is greatly reduced. In addition, the miniature circuit breaker only has four wiring terminals, wiring operation is optimized, and safety is also ensured.

In the embodiment shown in fig. 2 and 3, the housing 1 is composed of two opposite half-shells, namely a first half-shell 11 and a second half-shell 12, which are detachably connected, and an intermediate housing 13 located between the two opposite half-shells. The first half shell 11, the second half shell 12 and the intermediate shell 13 together enclose an inner space of the housing 1, and the intermediate shell 13 divides the inner space into two compartments to arrange two-phase circuits, respectively.

The construction of the interior of the miniature circuit breaker is described below in connection with the embodiments shown in fig. 4 to 7, where fig. 4 is a schematic view as seen from a first phase line (e.g., P-phase) and fig. 5 is a schematic view as seen from a second phase circuit (e.g., N-phase), each located in one compartment separated by an intermediate housing 13. In the illustrated embodiment, the micro circuit breaker includes an operating mechanism 2, a first phase circuit 3, a second phase circuit 4, a closing actuation mechanism 5, an opening actuation mechanism 6, and a control circuit board 7. The operating mechanism 2 includes a handle 21 and a catch 23 and a jump catch 24 operable by the handle 21. Referring to fig. 6 and 7, the handle 21 has an opening 213 for passing through a shaft connected to the housing 1, whereby the handle 21 is rotatable about the shaft, and a portion of the handle 21 extends out of the housing 1 for manual opening and closing operation. A handle torsion spring 212 is provided between the handle 21 and the housing 1, the handle torsion spring 212 always applies a force to the handle 21 to make it rotate in a first direction (clockwise direction in fig. 4, counterclockwise direction in fig. 5) or have a tendency to rotate in the first direction, and once the handle 21 rotates in the first direction, it means that the micro circuit breaker is opened.

The handle 21 is connected to the latch 23 by a link 22, the latch 23 is rotatably connected to the contact support 25 by a connecting pin 254, and the contact support 25 is rotatably connected to the pivot shaft 122 of the housing 1. Between the contact carrier 25 and the support wall 121 formed on the second half-shell 12 of the casing 1, a contact carrier spring 251 is provided, which contact carrier spring 251 always applies a force to the contact carrier 25 that causes it to rotate or has a tendency to rotate in a second direction (anticlockwise in fig. 4, clockwise in fig. 5), which means that the micro circuit breaker is opened once the contact carrier 25 rotates in this second direction. The jumper 24 is pivotably connected to the contact carrier 25, in the embodiment shown the pivot axis of the jumper 24 coinciding with the pivot axis of the contact carrier 25. The tripping device 24 and the latch 23 are always locked together during the closing of the miniature circuit breaker, and once the current outlet in the circuit is abnormal, such as overload, short circuit or electric leakage, the tripping device 24 is unlocked from the latch 23 under the driving of the opening actuating mechanism, so that the miniature circuit breaker is allowed to open. The jumper torsion spring 241 is connected between the contact holder 25 and the jumper 24, and always applies a force to the jumper 24 to rotate it in a first direction (clockwise in fig. 4, counterclockwise in fig. 5) or to have a tendency to rotate in the first direction. The jumper 24 unlocked from the buckle 23 is reset by the jumper torsion spring 241 and re-locked with the buckle 23 (re-buckling).

In order to clearly communicate the current opening/closing state of the miniature circuit breaker to the outside, the operating mechanism 2 is provided with a sign 26, the sign 26 is rotatably connected to a shaft provided in the housing 1, and an arc-shaped groove 261 is formed in a main body of the sign 26, wherein a connecting pin 254 for connecting the latch 23 and the contact holder 25 passes through the arc-shaped groove 261 and can move along the arc-shaped groove 261. Thus, during switching on and off of the miniature circuit breaker, the indication plate 26 is rotated and aligned with the opening formed on the housing 1 at different positions, which may be marked with characters such as "on", "off", or the like, or with different colors, such as blue and red, to transmit the switching on and off state information to the outside.

A closing actuator 5 for driving the operating mechanism 2 is installed in the inner space of the housing 1. Referring to fig. 2 to 3, in order to facilitate installation of the closing actuating mechanism 5, the intermediate housing 13 is formed with a recess 133, and the closing actuating mechanism 5 is installed in the recess 133. In the illustrated embodiment, the closing actuator 5 is an electromagnetic closing mechanism including a closing coil 51 disposed in a recess and a closing armature 52 surrounded by the closing coil 51. The closing armature 52 is drivingly connected to the handle 21 by means of a transmission, and the closing coil 51 is electrically connected to the control circuit board 7 mounted on the second half-shell 12. By supplying power to the closing coil 51 through the control circuit board 7, the closing armature 52 is driven to move, for example, retract into the closing coil 51, thereby moving the handle 21.

In one embodiment, the closing armature 52 is connected to the handle 21 through a rack and pinion transmission. For example, the closing armature 52 has a rack 521 mounted thereon, and the handle 21 has a tooth structure 211 arranged along a circumferential direction thereof, and the transmission gear 53 is provided between the rack 521 and the tooth structure 211. When the closing armature 52 moves, the handle 21 is driven to rotate along the second direction through the rack and pinion transmission mechanism, and the rotation of the handle 21 drives the lock 23, the trip 24 and the contact support 25 to rotate together through the connecting rod 22, wherein the contact support 25 rotates along the first direction, so that the first moving contact spring 311 drives the first moving contact 31 and the first fixed contact 32 to close, and the second moving contact spring 411 drives the second moving contact 41 and the second fixed contact 42 to close.

In one embodiment, the drive gear 53 may be comprised of two gears coupled together but having different numbers of teeth, namely a first gear 531 engaged to the rack 521 and a second gear 532 engaged to the tooth structure of the handle 21. The double-gear structure can reduce the driving force required by the closing actuating mechanism during automatic closing, so that the power consumption of the closing coil is reduced.

Two-phase circuits operable by the operating mechanism 2 are adjacently arranged in the housing 1. According to the embodiment shown in fig. 4, the first phase circuit 3, which may also be referred to as P-phase, includes a first movable contact 31, a first stationary contact 32, a first connection terminal 33 and a second connection terminal 34. The first connection terminal 33 is electrically connected to the first stationary contact 32 through a wire 331 to constitute a main circuit. The first current transformer 36 is sleeved on the wire 331 and located between the first connection terminal 33 and the first stationary contact 32, and the first current transformer 36 is electrically connected to the control circuit board 7 located in the inner space of the housing 1, so as to send the measured current information of the main circuit to the control circuit board 7. The control circuit board 7 is mounted on the second half shell 12, and is located between the second half shell 12 and the intermediate shell 13, and the intermediate shell 13 may be formed with an escape opening to facilitate mounting of the first current transformer 36. In one embodiment, the intermediate housing 13 may be composed of a detachable first housing portion 131 and a detachable second housing portion 132, and the first housing portion 131 and the second housing portion 132 enclose the above-mentioned escape opening and recess 133.

The first movable contact 31 is pivotally connected to the contact support 25, and a first movable contact torsion spring 311 is connected between the contact support 25 and the first movable contact 31. The first movable contact torsion spring 311 applies a force to the first movable contact 31 to make it rotate in a first direction (clockwise direction shown in fig. 4 and counterclockwise direction shown in fig. 5) or have a tendency to rotate in the first direction, and once the first movable contact 31 rotates in the first direction, it approaches and engages the first stationary contact 32 to close the first phase circuit 3.

The opening actuating mechanism 6 is arranged between the first movable contact 31 and the second connection terminal 34. According to the utility model discloses an embodiment, separating brake actuating mechanism 6 has dual protection function, overload protection and short-circuit protection promptly. As shown in the figure, the opening actuating mechanism 6 adopts an electromagnetic trip mechanism, wherein a first opening coil 62 for overload protection surrounds the opening armature 61, and the first opening coil 62 is electrically connected to the control circuit board 7, and a second opening coil 63 for short-circuit protection surrounds the first opening coil 62, and the second opening coil 63 is electrically connected to the second connection terminal 34 through a wire 341. Therefore, once the first current transformer 36 detects an overcurrent, the control circuit board 7 supplies power to the first opening coil 62, drives the opening armature 61 to move in a direction close to the trip 24 and strike the trip 24, so as to cause the trip 24 to be unlocked from the latch 23, so as to allow the first movable contact 31 to be opened from the first fixed contact 32. And once the circuit is short-circuited, for example, the first phase circuit is short-circuited with the second phase circuit, the current flowing in the second switching coil 63 electrically connected to the second connection terminal 34 causes the second switching coil 63 to generate a magnetic field sufficient to drive the switching armature 61, so that the switching armature 61 moves to impact the trip 24, and the trip 24 is unlocked from the latch 23, so as to allow the first movable contact 31 to be switched off from the first fixed contact 32.

In one embodiment, two overload current thresholds or threshold ranges are preset, wherein the first threshold or threshold range is smaller than the second threshold or threshold range. When the overcurrent detected by the first current transformer 36 is less than or equal to the first threshold, or is within the first threshold range, which means that the overcurrent is small, the power supply from the control circuit board 7 to the first opening coil 62 may be delayed for a preset time, so as to implement the delayed opening function. As soon as the overcurrent detected by the first current transformer 36 is equal to or greater than the first threshold value or within the second threshold value range, which means that the overcurrent is large, the first opening coil 62 can be immediately and almost immediately supplied with power from the control circuit board 7, so as to realize the short-time rapid opening function. Furthermore, remote operation of the opening can also be achieved by the first opening coil 62 and the opening armature 61 being connected to the control circuit board 7.

An embodiment of the second phase circuit 4 (e.g. N-phase) is shown in fig. 5. As shown, the second phase circuit 4 includes a third connection terminal 43, a second stationary contact 42 electrically connected to the third connection terminal 43, a second movable contact 41, and a fourth connection terminal 44 electrically connected to the second movable contact 41 through a wire 441. Similar to the first movable contact, the second movable contact 41 is pivotally connected to the contact support 25, and the first movable contact and the second movable contact are respectively located at two opposite sides of the contact support. The second moving contact torsion spring 411 is connected between the second moving contact 41 and the contact support 25, and always applies a force to the second moving contact 41 to make it rotate in a first direction (clockwise direction shown in fig. 4 and counterclockwise direction shown in fig. 5) or have a tendency to rotate in the first direction, and once the second moving contact 41 rotates in the first direction, it will approach and join the second fixed contact 42 to close the second phase circuit 4.

In one embodiment, the opening of the first phase circuit 3 and the second phase circuit 4 is not synchronous, and by making the overtravel of the first movable contact 31 smaller than that of the second movable contact 41, it can be realized that the opening of the first movable contact 31 and the first fixed contact 32 occurs before the opening of the second movable contact 41 and the second fixed contact 42.

The over travel of the first movable contact 31 is less than that of the second movable contact 41, which can be realized by properly designing the mating relationship between the contact support 25 and the first movable contact 31 and the second movable contact 41. In the illustrated embodiment, the contact support 25 is provided with a first pin 252 at a side where the first movable contact 31 is mounted, and a second pin 253 at a side where the second movable contact 41 is mounted, and an outer diameter of the first pin 252 is larger than an outer diameter of the second pin 253. The pivot axis of the first movable contact 31 coincides with the pivot axis of the second movable contact 41. The first movable contact 31 has a first arc-shaped section 312 extending around the outer peripheral surface of the first pin 252, and the second movable contact 41 has a second arc-shaped section 412 extending around the outer peripheral surface of the second pin 253, and the arcs of the first arc-shaped section 312 and the second arc-shaped section 412 are substantially the same. Therefore, the overtravel of the first moving contact 31 is smaller than the overtravel of the second moving contact 41, so that the first moving contact 31 and the first fixed contact 32 are separated from each other, and then the second moving contact 41 and the second fixed contact 42 are separated from each other.

Besides the proper design of the mating relationship between the contact support 25 and the first movable contact 31 and the second movable contact 41, the skilled person can also think of other ways to achieve that the over travel of the first movable contact 31 is smaller than the over travel of the second movable contact 41. For example, in an embodiment not shown, the over travel of the first movable contact 31 can be smaller than that of the second movable contact 41 by designing the first movable contact torsion spring 311 to apply a force to the first movable contact 31 different from that applied to the second movable contact 41 by the second movable contact torsion spring 411.

The arc extinguishing chamber 35 can be arranged only for the first phase circuit 3 on the basis of the back-opening of the second phase circuit 4 relative to the first phase circuit 3. As shown in fig. 4, the arc-extinguishing chamber 35 is arranged directly below the first stationary contact 32. Baffles (not shown) extending towards the arc chute may also be arranged on opposite sides of the first stationary contact 32, further ensuring that the arc is directed towards the arc chute 35.

Referring to fig. 4 and 5, the first phase circuit 3 and the second phase circuit 4 are provided with a second earth leakage protected current transformer 9. The wire 341 connecting the second connection terminal 34 to the opening actuating mechanism 6 and the wire 441 connecting the fourth connection terminal 44 to the second movable contact 41 both pass through the second current transformer 9. The second current transformer 9 is electrically connected to the control circuit board 7 to send a signal to the control circuit board 7 when the leakage current is detected, and the control circuit board 7 controls the tripping actuating mechanism 6 to drive the tripping device 24 to trip based on the signal.

The miniature circuit breaker according to this embodiment is further provided with a test assembly 8 for electrical leakage testing. As shown in fig. 4 and 5, the button 81 of the testing assembly 8 is inserted into the opening of the housing 1 and can move relative to the housing 1, and a side of the button 81 facing the housing 1 is provided with a conductive structure electrically connected to the fourth connection terminal 44. A lead 82 extends in the inner space of the housing 1 and is electrically connected to the control circuit board 7, while the lead 82 is electrically connected to the lead 331/first connection terminal 33, and a resistor 84 is provided at an end of the lead 82 facing the push button 81, the resistor 84 being in the inner space of the housing 1 and normally spaced from the push button 81 and the conductive mechanism. The button 81 is pressed to drive the conductive structure to be short-circuited with the resistor 84 and the wire 82, the conductive structure is electrically connected to the fourth connection terminal 44 through the wire, so that leakage current is generated, the control circuit board 7 detects a leakage signal, the control circuit board 7 supplies power to the first opening coil 62 to drive the opening armature 61 to move in a direction close to the trip 24 and impact the trip 24, the trip 24 and the latch 23 are unlocked, and the first movable contact 31 and the first fixed contact 32 are allowed to be opened, so that the leakage test is completed.

In the embodiment shown, an elastic member 83 (e.g. a torsion spring) is provided on the housing 1 and supports the push button 81, which elastic member 83 always exerts a force on the push button 81 causing it to move in a direction away from the housing 1 or having a tendency to move in a direction away from the housing 1. Therefore, only when the button 81 is pressed into the housing 1, the button 81 drives the conductive structure to be short-circuited with the resistor 84 and to conduct the circuit, and once the pressing force disappears, the button 81 moves away from the resistor immediately under the action of the elastic member 83 to cut off the circuit. In one embodiment, the elastic member 83 is electrically connected to the fourth connection terminal 44 through a wire, and functions as a conductive structure.

It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims (10)

1. The utility model provides a divide-shut brake mechanism for miniature circuit breaker which characterized in that includes:

an operating mechanism (2) comprising a handle (21), a latch (23) connected to the handle (21), a jumper (24) which can be locked or unlocked with the latch (23), and a contact support (25) which supports the latch (23) and the jumper (24);

two movable contacts, each pivotably mounted to the contact support (25);

a closing actuating mechanism (5) comprising a closing coil (51) and a movable closing armature (52) surrounded by the closing coil (51), the closing armature (52) being drivingly connected to the operating mechanism (2), the closing coil having a control circuit board connection terminal;

the brake separating actuating mechanism (6) comprises a brake separating coil and a movable brake separating armature (61) surrounded by the brake separating coil, and the brake separating armature (61) is arranged corresponding to the tripping buckle (24) and can move to drive the tripping buckle (24) to be unlocked from the lock catch (23).

2. A switching mechanism according to claim 1, wherein said two movable contacts comprise a first movable contact (31) and a second movable contact (41) pivotally mounted on opposite sides of said contact support (25), respectively, the overtravel of said first movable contact (31) being less than the overtravel of said second movable contact (41).

3. A switching closing and closing mechanism according to claim 2, wherein said contact support (25) has a first pin (252) and a second pin (253) which are coaxial on opposite sides, wherein an outer diameter of said first pin (252) is larger than an outer diameter of said second pin (253), and said first movable contact (31) and said second movable contact (41) are pivotally connected coaxially on said opposite sides of said contact support (25), and said first movable contact (31) has a first arcuate section (312) extending around an outer peripheral surface of said first pin (252), and said second movable contact (41) has a second arcuate section (412) extending around an outer peripheral surface of said second pin (253), wherein an arc degree of said first arcuate section (312) and said second arcuate section (412) is the same.

4. A switching-closing mechanism according to claim 2, wherein a moving contact torsion spring is connected between the contact support (25) and the two moving contacts, the moving contact torsion springs apply a force to the corresponding moving contacts to move the moving contacts in the closing direction, and the forces applied by the two moving contact torsion springs are different.

5. Switching-closing mechanism according to claim 1, characterized in that the opening coil comprises a first opening coil (62) surrounding the opening armature (61), the first opening coil (62) having a control circuit board connection terminal.

6. Switching mechanism according to claim 5, characterized in that the opening coil comprises a second opening coil (63) surrounding the first opening coil (62), the second opening coil (63) having an engagement portion for electrical connection to a load terminal of the miniature circuit breaker.

7. Switching-closing mechanism according to claim 1, characterized in that the handle (21) has a tooth structure (211), the closing armature (52) being provided with a rack (521), a transmission gear (53) being engaged between the tooth structure (211) and the rack (521).

8. Switching mechanism according to claim 7, characterized in that the transmission gear (53) comprises a first gear (531) and a second gear (532) connected, wherein the first gear (531) is engaged with the rack (521) and the second gear (532) is engaged with the tooth structure (211).

9. Switching-closing mechanism according to claim 1, characterized in that the operating mechanism (2) further comprises an indicator plate (26), the indicator plate (26) having an arc-shaped groove (261), wherein a connecting pin shaft (254) pivotally connecting the latch (23) to the contact carrier (25) is arranged through the arc-shaped groove (261) and is movable along the arc-shaped groove (261).

10. A miniature circuit breaker comprising:

a housing (1);

two-phase circuits mounted in the housing (1), the two-phase circuits each having a moving contact and a stationary contact;

a switching-on and switching-off mechanism installed in the shell (1);

the switching mechanism is characterized in that the switching mechanism is the switching mechanism according to any one of claims 1 to 9, wherein the two moving contacts are respectively constructed as moving contacts in the two-phase circuit.

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