CN112151340A

CN112151340A - Switching-on and switching-off mechanism of circuit breaker

Info

Publication number: CN112151340A
Application number: CN201910569594.0A
Authority: CN
Inventors: 邓应尝; 胡金利; 高建
Original assignee: Shanghai Yongji Electrical Holding Co ltd
Current assignee: Shanghai Yongji Electrical Holding Co ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-12-29

Abstract

The invention relates to a switching-on and switching-off mechanism of a circuit breaker, when the switching-on and switching-off mechanism of the circuit breaker is used for switching-on and switching-off operation, an operation knob rotates clockwise to enable a clamping protrusion of a locking piece to be clamped on a clamping opening of a tripping piece and drive a rotating support to rotate clockwise, so that a movable contact rod is driven to rotate to a switching-on position; the rotating bracket compresses the opening spring when rotating clockwise; when the tripping piece is triggered to rotate anticlockwise so that the bayonet is separated from the clamping protrusion, the opening spring pushes the rotating support to rotate anticlockwise so as to drive the movable contact rod to rotate to the opening position. Therefore, the operating mechanism of the surge protector can conveniently perform switching-on and switching-off operations, and is simple in structure and convenient to use.

Description

Switching-on and switching-off mechanism of circuit breaker

Technical Field

The invention relates to a switching-on and switching-off mechanism of a circuit breaker.

Background

The operating mechanism is an important component of a circuit breaker or a surge protector backup protector, and the sensitivity and reliability of the action of the operating mechanism are directly related to the performance of a product. Most of the existing surge protector backup protector structures are C45 miniature circuit breaker structures, and the existing surge protector backup protector structures are low in breaking indexes, complex in structure, short in service life and low in reliability.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a switching mechanism for a circuit breaker, which is capable of performing switching operation easily, and has a simple structure and high reliability.

In order to achieve the purpose, the invention provides a switching-on and switching-off mechanism of a circuit breaker, which adopts the following technical scheme: a switching-off and switching-on mechanism of a circuit breaker comprises an operation knob, a rotating bracket, a tripping piece, a locking piece and a switching-off spring; the middle part of the rotating bracket is connected to a shell of the backup protection area through a first rotating pin, the lock catch piece is connected to the upper part of the rotating bracket through a second rotating pin, the middle part of the jump fastener is connected to the upper part of the rotating bracket through a third rotating pin, a bayonet is arranged at the upper end of the jump fastener, and a trigger head is arranged at the lower end of the jump fastener; the lower part of the rotating bracket is hinged with a transmission rod, and the transmission rod is in transmission connection with a movable contact rod of the contact device;

the operation knob is positioned in the front of the rotating bracket, the opening and closing spring is positioned at the back of the operation knob, one end of the opening and closing spring is abutted against the back of the rotating bracket, and the other end of the opening and closing spring is abutted against the shell of the backup protection area;

the operation knob is connected with the lock catch piece through a connecting rod, and the lock catch piece is provided with a clamping protrusion;

the operating knob rotates clockwise to enable the clamping protrusion of the locking piece to be clamped on the clamping opening of the tripping piece and drive the rotating bracket to rotate clockwise, so that the movable contact rod is driven to rotate to a switching-on position; the rotating bracket compresses the opening spring when rotating clockwise;

when the tripping piece is triggered to rotate anticlockwise so that the bayonet is separated from the clamping protrusion, the opening spring pushes the rotating support to rotate anticlockwise so as to drive the movable contact rod to rotate to the opening position.

Preferably, the trigger head is aligned with a tripping mechanism, and the tripping mechanism can push the trigger head to rotate the tripping piece anticlockwise, so that the bayonet and the clamping protrusion are tripped.

Preferably, the upper end of the transmission rod is hinged to the lower portion of the rotating support through a fourth rotating pin, a torsion spring is sleeved on the fourth rotating pin, and the torsion spring enables the transmission rod to be pressed on the rotating support in the clockwise direction.

Preferably, the middle part of the movable contact rod is hinged on the fifth rotating pin, the upper end of the movable contact rod is provided with a driving waist hole, the lower end of the driving rod is provided with a driving sliding pin, and the driving sliding pin is inserted into the driving waist hole and can slide along the driving waist hole.

Preferably, the rotating bracket is provided with a propping surface, the transmission rod is provided with a limiting surface, and the limiting surface props against the propping surface under the torsion action of the torsion spring.

More preferably, a clamping groove is formed in the back face of the transmission rod, the torsion spring is provided with a connecting arm, and the connecting arm is clamped in the clamping groove.

Preferably, the movable contact lever includes a transmission portion and a first conductive portion, and the transmission portion is connected to the transmission lever; the contact device further comprises a static contact rod, the static contact rod comprises a connecting portion and a second conductive portion, the connecting portion is connected with the wiring terminal, the second conductive portion extends along the left-right direction, and when the dynamic contact rod rotates to enable the first conductive portion to be in contact with the second conductive portion, the first conductive portion also extends along the left-right direction.

More preferably, the first conductive part is perpendicular to the transmission part, and the fifth rotating pin is connected to a part, close to the transmission part, of the first conductive part; the second conductive portion is perpendicular to the connection portion.

More preferably, the upper surface of the first conductive part is provided with a movable contact piece, the lower surface of the second conductive part is provided with a static contact piece, and the movable contact piece is positioned below the static contact piece.

As described above, the switching-on/off mechanism of the circuit breaker according to the present invention has the following beneficial effects: when the switching-on and switching-off mechanism of the circuit breaker is used for switching-on and switching-off operation, the operation knob rotates clockwise to enable the clamping protrusion of the locking piece to be clamped on the clamping opening of the tripping piece and drive the rotating support to rotate clockwise, so that the movable contact rod is driven to rotate to the switching-on position; the rotating bracket compresses the opening spring when rotating clockwise; when the tripping piece is triggered to rotate anticlockwise so that the bayonet is separated from the clamping protrusion, the opening spring pushes the rotating support to rotate anticlockwise so as to drive the movable contact rod to rotate to the opening position. Therefore, the operating mechanism of the surge protector can conveniently perform switching-on and switching-off operations, and is simple in structure and convenient to use.

Drawings

Fig. 1 is a front view of a switching mechanism of a circuit breaker according to the present invention, showing a switching state.

Fig. 2 is a front view of a switching mechanism of a circuit breaker according to the present invention, showing a closed state.

Fig. 3 is a front view of the opening and closing mechanism of the circuit breaker of the present invention, in which the moving contact rod is in a state of being repelled by a large current.

Fig. 4 is an exploded view of the switching mechanism of the circuit breaker according to the present invention.

Fig. 5 is a partial schematic view showing the connection of the rotary bracket, the transmission rod and the movable contact rod.

Fig. 6 shows an exploded view of the rotating gantry.

Fig. 7 shows a schematic view of the construction of the transmission rod.

Fig. 8 shows an exploded view of the stationary rod.

Description of the element reference numerals

1 operating knob

2 rotating support

3 first half cradle

4 second half of the stent

5 blocking surface

6 reset block

7 avoiding opening

8 clamping groove

9 jump button

10 fastener

11 opening spring

12 first pivot pin

13 second rotating pin

14 third rotating pin

15 fourth rotating pin

16 fifth rotating pin

17 bayonet

18 trigger head

19 transmission rod

20 contact arrangement

21 moving contact rod

22 connecting rod

23 chuck

24 torsion spring

25 drive waist hole

26 drive slide pin

27 abutting surface

28 limiting surface

29 connecting arm

30 transmission part

31 first conductive part

32 static contact rod

33 bending main body

34 bending sheet

35 connecting part

36 second conductive part

37 moving contact

38 static contact

39 reset piece

40 positioning groove

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 5, the present invention provides a switching mechanism of a circuit breaker, which includes an operation knob 1, a rotation bracket 2, a trip device 9, a locking device 10 and a switching-off spring 11; the middle part of the rotating bracket 2 is connected to a shell of a backup protection area through a first rotating pin 12, the locking piece 10 is connected to the upper part of the rotating bracket 2 through a second rotating pin 13, the middle part of the jump buckle piece 9 is connected to the upper part of the rotating bracket 2 through a third rotating pin 14, the upper end of the jump buckle piece 9 is provided with a bayonet 17, and the lower end of the jump buckle piece 9 is provided with a trigger head 18; the lower part of the rotating bracket 2 is hinged with a transmission rod 19, and the transmission rod 19 is in transmission connection with a movable contact rod 21 of a contact device 20;

the operation knob 1 is positioned in the front of the rotating bracket 2, the opening spring 11 is positioned on the back of the operation knob 1, one end of the opening and closing spring abuts against the back of the rotating bracket 2, and the other end of the opening and closing spring abuts against the shell of the backup protection area;

the operation knob 1 is connected with the lock catch piece 10 through a connecting rod 22, and a clamping protrusion 23 is arranged on the lock catch piece 10;

the operation knob 1 rotates clockwise to enable the clamping projection 23 of the locking piece 10 to be clamped on the clamping opening 17 of the tripping piece 9 and drive the rotating bracket 2 to rotate clockwise, so that the movable contact rod 21 is driven to rotate to the switching-on position; the rotating bracket 2 compresses the opening spring 11 when rotating clockwise;

when the tripping piece 9 is triggered to rotate anticlockwise so that the bayonet 17 is separated from the clamping lug 23, the opening spring 11 pushes the rotating bracket 2 to rotate anticlockwise so as to drive the movable contact rod 21 to rotate to the opening position.

When the switching-on and switching-off mechanism of the circuit breaker is used for switching-on and switching-off operation, the operation knob 1 rotates clockwise to enable the clamping protrusion 23 of the locking piece 10 to be clamped on the clamping opening 17 of the tripping piece 9 and drive the rotating support 2 to rotate clockwise, so that the movable contact rod 21 is driven to rotate to the switching-on position; the rotating bracket 2 compresses the opening spring 11 when rotating clockwise; when the tripping piece 9 is triggered to rotate anticlockwise to separate the bayonet 17 from the clamping lug 23, the opening spring 11 pushes the rotating bracket 2 to rotate anticlockwise so as to drive the movable contact rod 21 to rotate to the opening position. Therefore, the operating mechanism of the surge protector can conveniently perform switching-on and switching-off operations, and is simple in structure and convenient to use.

As a preferred embodiment, as shown in fig. 4 and 5, the upper end of the transmission rod 19 is hinged to the lower portion of the rotating bracket 2 through a fourth rotating pin 15, a torsion spring 24 is sleeved on the fourth rotating pin 15, the torsion spring 24 presses the transmission rod 19 on the rotating bracket 2 in a clockwise direction, as shown in fig. 7, a pin hole for connecting the fourth rotating pin 15 is formed in the upper end of the transmission rod 19, and a pin hole for connecting the fifth rotating pin 16 is formed in the lower end of the transmission rod 19. When the circuit breaker is closed, the rotating bracket 2 rotates clockwise and drives the transmission rod 19 to rotate together, thereby driving the movable contact rod 21 to rotate to a closed state. When instantaneous large current passes through the circuit breaker, the movable contact rod 21 is temporarily repelled from the static contact rod 32, the movable contact rod 21 drives the transmission rod 19 to rotate anticlockwise to overcome the acting force of the torsion spring 24 and rotate for a certain angle, in the process, the rotating bracket 2 does not rotate, the impact force of the transmission rod 19 on the rotating bracket 2 is small, and the mistaken tripping and brake separating are not easy to occur. In order to enable the transmission rod 19 to be close to the rotating bracket 2 under the action of the torsion spring 24, please refer to fig. 5 and 6, the rotating bracket includes a first half bracket 3 and a second half bracket 4, the first half bracket 3 is provided with a blocking surface 5 for blocking the torsion spring, the rotating bracket 2 is provided with a leaning surface 27, the leaning surface 27 is provided on the first half bracket 3, the transmission rod 19 is provided with a limiting surface 28, and the limiting surface 28 leans against the leaning surface 27 under the torsion action of the torsion spring 24. As shown in fig. 7, the back of the transmission rod 19 is provided with a slot 8, and the torsion spring 24 has a connecting arm 29, and the connecting arm 29 is clamped in the slot 8. As shown in fig. 1 to 4, the middle portion of the movable contact rod 21 is hinged to the fifth rotating pin 16, the upper end of the movable contact rod 21 is provided with a driving waist hole 25, the lower end of the driving rod 19 is provided with a driving slide pin 26, and the driving slide pin 26 is inserted into the driving waist hole 25 and can slide along the driving waist hole 25, so that the movable contact rod 21 can be driven to rotate by the swinging of the lower end of the driving rod 19. As shown in fig. 6, a reset block 6 is disposed on the back of the rotating bracket 2, and in the closing process of the circuit breaker, the reset block 6 resets the electromagnetic trip mechanism by pushing a reset part. The rotating bracket 2 is also provided with a positioning groove 40, and the opening spring 11 is clamped in the positioning groove 40.

The operation of the switching mechanism of the circuit breaker according to the present invention will be described below.

A switching-on process: referring to fig. 1, fig. 1 is a schematic diagram showing a circuit breaker in a switching-off state, from this initial state, a clamping protrusion 23 on a locking piece 10 is clamped with a clamping opening 17 on a trip piece 9, an operation knob 1 is rotated clockwise to push a connecting rod 22 to rotate the locking piece 10, the trip piece 9 and a rotating bracket 2 clockwise, the rotating bracket 2 compresses a switching-off spring 11 to store energy for the switching-off spring 11, after a movable contact rod 21 contacts with a stationary contact rod 32, the operation knob 1 drives other parts to rotate clockwise by a certain angle, at this time, the lower end of a transmission rod 19 is limited by the movable contact rod 21, so that the transmission rod 19 rotates counterclockwise by a certain angle around a fourth rotating pin 15 against the torsion force of a torsion spring 24, a gap is left between a limiting surface 28 on the transmission rod 19 and an abutting surface 27 on the rotating bracket 2, and stopping the movement of all parts of the mechanism until the handle reaches the switching-on position. Because the transmission rod 19 is pressed on the rotating bracket 2 in a clockwise direction by the force of the torsion spring 24, when the rotating bracket 2 rotates clockwise, the rotating bracket 2 drives the transmission rod 19 to rotate clockwise, the driving slide pin 26 at the lower end of the transmission rod 19 slides in the driving waist hole 25 on the movable contact rod 21 to poke the movable contact rod 21, so that the movable contact rod 21 rotates counterclockwise to a closing state, and the closing state is shown in fig. 2.

The brake opening process: referring to fig. 2, fig. 2 is a schematic diagram illustrating a circuit breaker in a closing state, a trigger head 18 is disposed on the trip unit 9, the trigger head 18 is aligned with a trip mechanism, and the trip mechanism can push the trigger head 18 to rotate the trip unit 9 counterclockwise, so as to trip the bayonet 17 and the catch 23. When the circuit breaker needs to be tripped and opened, the tripping mechanism pushes the trigger head 18 to enable the tripping piece 9 to rotate anticlockwise for a certain angle, the bayonet 17 of the tripping piece 9 is separated from the clamping protrusion 23 of the locking piece 10, and under the action of the opening spring 11, the rotating bracket 2 rotates anticlockwise and drives the transmission rod 19 to rotate anticlockwise together, so that the movable contact rod 21 is driven to rotate to the opening state. As shown in fig. 4, the rotating bracket 2 is further provided with a reset piece 39, and the reset piece 39 can drive the snap fastener 9 to reset.

The process of repelling the heavy-current discharge movable contact comprises the following steps: referring to fig. 3, fig. 3 shows a state where the movable contact lever 21 is repelled by a large current. When the circuit breaker is in a closing state, if a short-term large current passes through the circuit breaker, the large current can cause a short-term huge electric repulsion force to be generated between the movable contact rod and the static contact rod 32, the electric repulsion force is too large and can generate impact force on the rotary bracket 2 which is in transmission connection with the movable contact rod 21 and other moving parts, and the tripping part 9 and the locking part 10 can be induced to be tripped, so that the circuit breaker is mistakenly opened. In the switching-on and switching-off mechanism of the circuit breaker, the transmission rod 19 is pressed on the rotating bracket 2 by the torsion spring 24, so if the movable contact rod 21 is subjected to a large electric repulsive force, the movable contact rod 21 can drive the transmission rod 19 to overcome the electric repulsive force and rotate anticlockwise for a certain angle, thereby relieving the impact force on the rotating bracket 2 and other moving parts, and preventing the circuit breaker from being tripped and switched off by mistake. After the instantaneous large current passing through the circuit breaker disappears, the transmission rod 19 drives the movable contact rod 21 to rotate to a closing state under the action of the torsion spring 24. For example, when a lightning impulse current of 10/350 μ s or 8/20 μ s flows through the protector, the movable contact rod 21 is repelled rapidly by the action of electric repulsion force, and rotates clockwise, and drives the movable transmission rod 19 to rotate counterclockwise around the fourth rotating pin 15, so that residual energy is discharged inside the circuit breaker, as shown in fig. 6, since the avoiding gap 7 is formed in the bracket, when the transmission rod 19 is pushed by the movable contact rod 21 to rotate counterclockwise, the movable contact rod 21 partially rotates into the avoiding gap 7 to avoid colliding with the rotating bracket 2 to impact the rotating bracket 2, so as to cause mistaken tripping and opening of the switch. After the lightning current passes, the driving rod 19 rotates counterclockwise under the action of the spring force of the driving rod 19 to drive the movable contact rod 21 to make the other static contact rods 32 contact again, and the mechanism returns to the closing state.

When the power frequency current reaches a preset value, a mandril of an electromagnetic tripping mechanism in a control loop of the circuit breaker is popped out rightwards, the mandril pushes a trigger head 18 to enable a tripping piece 9 to rotate anticlockwise, a locking piece 10 is pushed to be separated from the tripping piece 9, and the circuit breaker is tripped and opened.

When a transient heavy current load passes through the circuit breaker, the movable contact rod 21 and the fixed contact rod 32 are repelled by electric repulsion, the movable contact rod 21 impacts parts such as the rotating bracket 2 through the transmission part 30, and the locking piece 10 and the releasing piece are subjected to excessive impact vibration, so that the unlocking and releasing can be possibly carried out, and the circuit breaker is mistakenly opened. In order to make the electric repulsive force between the movable contact lever 21 and the stationary contact lever 32 small, as a preferred embodiment, as shown in fig. 1, the movable contact lever 21 includes a transmission portion 30 and a first conductive portion 31, which is connected to the transmission lever 19; the contact device 20 further includes a stationary contact bar 32, the stationary contact bar 32 includes a connecting portion 35 and a second conductive portion 36, the connecting portion 35 is connected to the terminal, the second conductive portion 36 extends in the left-right direction, and when the movable contact bar 21 is rotated to bring the first conductive portion 31 into contact with the second conductive portion 36, the first conductive portion 31 also extends in the left-right direction. Thus, when the circuit breaker is closed, when current flows through the first conductive part 31 and the second conductive part 36, the current flows along a substantially straight direction, electromagnetic fields generated by the current in the first conductive part 31 and the second conductive part 36 do not influence each other, and the electric repulsive force is large, so that the electric repulsive force between the movable contact rod 21 and the fixed contact rod 32 can be made as small as possible. In order to make the arrangement of the parts in the circuit breaker reasonable, as shown in fig. 1 and fig. 2, the first conductive portion 31 is perpendicular to the transmission portion 30, and the fifth rotating pin 16 is connected to a portion of the first conductive portion 31 close to the transmission portion 30; the second conductive part 36 is perpendicular to the connecting part 35, and the connecting part 35 is connected with a wiring terminal of a circuit breaker; the upper surface of the first conductive part 31 is provided with a movable contact piece 37, the lower surface of the second conductive part 36 is provided with a static contact piece 38, and the movable contact piece 37 is positioned below the static contact piece 38, so that the movable contact rod 21 is pressed on the static contact rod 32 from the upper side when being closed.

In the switching-on and switching-off mechanism of the circuit breaker, the operation knob 1 is sleeved on a shell of the circuit breaker, the operation knob 1 is sleeved with the handle sleeve, a knob spring with one end being lapped on the shell of the circuit breaker and the other end being lapped on a rectangular groove of the operation knob 1 is arranged in the operation knob 1, and the knob spring is used for boosting the switching-on and switching-off state of the operation knob 1.

In order to facilitate the processing of the moving contact rod 21, as shown in fig. 8, the moving contact rod 21 includes a bending body 33 and a bending piece 34 formed by bending a metal plate, and the bending body 33 and the bending piece 34 are formed by bending and stamping, so that the cost is low.

Based on the technical scheme of the embodiment, the operating mechanism of the surge protector can conveniently perform switching-on and switching-off operations, and is simple in structure and convenient to use; and the impact effect of the electric repulsion force generated by the instantaneous large current on the circuit breaker can be relieved, and the occurrence of false tripping is avoided.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A switching-off and switching-on mechanism of a circuit breaker comprises an operation knob, a rotating bracket, a tripping piece, a locking piece and a switching-off spring; the middle part of the rotating bracket is connected to a shell of the backup protection area through a first rotating pin, the lock catch piece is connected to the upper part of the rotating bracket through a second rotating pin, the middle part of the jump fastener is connected to the upper part of the rotating bracket through a third rotating pin, a bayonet is arranged at the upper end of the jump fastener, and a trigger head is arranged at the lower end of the jump fastener; the lower part of the rotating bracket is hinged with a transmission rod, and the transmission rod is in transmission connection with a movable contact rod of the contact device;

2. The opening/closing mechanism of a circuit breaker according to claim 1, characterized in that: the trigger head is aligned with the tripping mechanism, and the tripping mechanism can push the trigger head to enable the tripping piece to rotate anticlockwise, so that the bayonet and the clamping protrusion are tripped.

3. The opening/closing mechanism of a circuit breaker according to claim 1, characterized in that: the upper end of the transmission rod is hinged to the lower portion of the rotating support through a fourth rotating pin, a torsion spring is sleeved on the fourth rotating pin, and the torsion spring enables the transmission rod to be pressed on the rotating support in the clockwise direction.

4. A switching on/off mechanism of a circuit breaker according to claim 3, characterized in that: the middle part of the movable contact rod is hinged to the fifth rotating pin, the upper end of the movable contact rod is provided with a driving waist hole, the lower end of the driving rod is provided with a driving sliding pin, and the driving sliding pin is inserted into the driving waist hole and can slide along the driving waist hole.

5. The opening/closing mechanism of a circuit breaker according to claim 1, characterized in that: the rotary support is provided with a leaning surface, the transmission rod is provided with a limiting surface, and the limiting surface leans against the leaning surface under the torsion action of the torsion spring.

6. The opening/closing mechanism of a circuit breaker according to claim 5, characterized in that: the back of the transmission rod is provided with a clamping groove, the torsion spring is provided with a connecting arm, and the connecting arm is clamped in the clamping groove.

7. The opening/closing mechanism of a circuit breaker according to claim 1, characterized in that: the movable contact rod comprises a transmission part and a first conductive part, and the transmission part is connected with the transmission rod; the contact device further comprises a static contact rod, the static contact rod comprises a connecting portion and a second conductive portion, the connecting portion is connected with the wiring terminal, the second conductive portion extends along the left-right direction, and when the dynamic contact rod rotates to enable the first conductive portion to be in contact with the second conductive portion, the first conductive portion also extends along the left-right direction.

8. The opening/closing mechanism of a circuit breaker according to claim 7, characterized in that: the first conductive part is vertical to the transmission part, and the fifth rotating pin is connected to a part, close to the transmission part, of the first conductive part; the second conductive portion is perpendicular to the connection portion.

9. The opening/closing mechanism of a circuit breaker according to claim 7, characterized in that: the upper surface of the first conductive part is provided with a movable contact piece, the lower surface of the second conductive part is provided with a static contact piece, and the movable contact piece is located below the static contact piece.