Circuit cut-off structure of switchgear and switchgear

Abstract

The circuit cut-off structure of the switch equipment comprises an electromagnetic unit, a conductive unit and an accessory unit corresponding to a static contact, the accessory unit comprises a first microswitch and an armature, and the armature is arranged opposite to a magnet yoke on the static contact and is in trigger fit with the first microswitch; when the energizing circuit of the electromagnetic unit is energized, the electromagnetic unit drives the moving contact and the static contact to be closed so as to switch on the load circuit. When the load circuit breaks down, the armature moves to trigger the first microswitch to cut off the power-on circuit of the electromagnetic unit under the action of the electromagnetic force of the magnet yoke. The switch equipment comprises the circuit cut-off structure of the switch equipment. Electromagnetic force is provided for the armature through the magnet yoke on the static contact of the load circuit connected to the switch equipment, so that the armature triggers the first microswitch to cut off the power-on circuit of the electromagnetic unit when the load circuit has faults such as short circuit and overload, the load circuit is cut off, the short circuit protection and overload protection functions are achieved, no extra fuse needs to be arranged, and the cost is reduced. The structure is simple and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit cutting structure of a switch device and the switch device. Background Art

[0002] There are two types of existing switchgear: one is a vacuum type, in which the moving and static contacts are in an inert gas atmosphere, which can effectively avoid arcing; the other is an air type, in which the moving and static contacts are in an air environment, and an arc extinguishing chamber is provided in the switchgear to extinguish the arc generated by the moving and static contacts during the opening and closing process. Existing switchgear, especially automotive contactors, do not have a protection function, that is, when a short circuit, overload or other fault occurs in the line, the circuit system relies on a fuse connected in series with the automotive switchgear to achieve the circuit cutting function. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide a circuit disconnection structure of a switch device and a switch device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The circuit disconnection structure of the switch device includes an electromagnetic unit and a conductive unit, wherein the conductive unit includes a moving contact and a stationary contact, wherein the electromagnetic unit drives the moving contact and the stationary contact to open and close, and further includes an accessory unit corresponding to the stationary contact, wherein the accessory unit includes a first microswitch and a movable armature, wherein the armature is arranged opposite to a yoke on the stationary contact and cooperates with the triggering of the first microswitch; when the power-carrying circuit of the electromagnetic unit is energized, the electromagnetic unit drives the moving contact and the stationary contact to close to connect the load circuit of the switch device, and at this time the armature does not trigger the first microswitch; when a load circuit fails, the armature moves under the action of the electromagnetic force of the yoke to trigger the first microswitch to disconnect the power-carrying circuit of the electromagnetic unit.

[0006] Optionally, the accessory unit further includes a second micro switch, the armature cooperates with the trigger of the second micro switch, and the second micro switch is used to send a signal that does not represent the state of the load circuit.

[0007] Optionally, the armature is located between the yoke and the second microswitch, and the moving direction of the armature is parallel to the moving direction of the trigger rod of the second microswitch; the first microswitch is located on the side of the armature, and the moving direction of the armature is perpendicular to the moving direction of the trigger rod of the first microswitch.

[0008] Optionally, the accessory unit also includes a first spring for resetting the armature; when the load circuit fails, the first spring stores energy; when the load circuit is cut off, the first spring releases energy to drive the armature to reset.

[0009] Optionally, the accessory unit also includes a trigger member, and the armature cooperates with the first microswitch trigger through the trigger member. The trigger member includes a connected matching part and a trigger part. The matching part of the trigger member is linked to the armature, and the trigger part contacts the trigger rod of the first microswitch.

[0010] Optionally, the accessory unit also includes a second spring for resetting the trigger member; when the load circuit fails, the second spring is compressed to store energy; when the load circuit is cut off, the second spring releases energy to drive the trigger member to reset.

[0011] Optionally, the accessory unit further comprises an accessory unit housing, the first micro switch is fixed in the accessory unit housing, and the armature is slidably mounted in the accessory unit housing.

[0012] Optionally, the static contact includes an extension section and a contact section arranged up and down, wherein the yoke is installed on the extension section of the static contact, and a static contact point is provided on the bottom surface of the contact section away from the extension section, and the accessory unit is located below the extension section of the static contact and to the side of the contact section.

[0013] Optionally, the static contact includes a bending section and a wiring section, the bending section is connected between the wiring section and the contact section to form a U-shaped structure, the wiring section is extended to form the extension section protruding from the contact section, a limiting opening is provided on the top surface of the extension section, the yoke has a bayonet for clamping the extension section, and the yoke is clamped at the limiting opening of the extension section through the bayonet.

[0014] Optionally, the conductive unit further includes an arc extinguishing chamber and a conductive unit housing, and the moving contact, static contact, arc extinguishing chamber, and accessory unit are installed in the conductive unit housing, the arc extinguishing chamber is located on the side of the moving contact, and the accessory unit is located below the yoke and above the arc extinguishing chamber.

[0015] Optionally, the arc extinguishing chamber includes a plurality of arc extinguishing grids, which are arranged in sequence in the up and down directions, and an exhaust structure is provided at a position corresponding to the arc extinguishing chamber on the conductive unit shell; an arc striking plate extending into the arc extinguishing chamber is provided at one end of the static contact for contacting and cooperating with the moving contact.

[0016] Optionally, the switch device is a vehicle switch device, the electromagnetic unit drives the moving contact and the static contact to open and close through a transmission rod, the moving contact and the static contact of the conductive unit are installed in a conductive unit housing, the electromagnetic unit includes a coil, a static iron core, and a moving iron core, the transmission rod is linked to the moving iron core, and is inserted into the conductive unit housing to connect with the moving contact, and when the moving iron core moves under the action of the electromagnetic force of the coil, the moving contact is driven by the transmission rod to move and cooperate with the static contact.

[0017] Optionally, the conductive unit has a moving contact and two symmetrical static contacts, the switching device has two accessory units corresponding to the two static contacts, the two static contacts have a static contact on their bottom surfaces, the moving contact is a bridge-shaped structure, and a moving contact is provided on each of the top surfaces at both ends for correspondingly cooperating with the static contacts of the two static contacts.

[0018] A switch device, comprising a circuit disconnection structure of a switch device of any one of the above technical solutions.

[0019] The circuit disconnection structure and switch device of the utility model provide electromagnetic force to the armature by means of a yoke on a static contact connected to a load circuit of the switch device, so that when a short circuit, overload or other fault occurs in the load circuit, the armature triggers the first microswitch to disconnect the energized circuit of the electromagnetic unit, thereby disconnecting the load circuit. The switch device itself has short circuit protection and overload protection functions, and does not require an additional fuse. The structure is simple and the cost is lower.

[0020] In addition, the setting of the second micro switch adds an alarm function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a circuit cutting structure of a switch device of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the conductive unit and the accessory unit of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the accessory unit of the utility model when the load circuit is connected;

[0024] Figure 4 It is a structural schematic diagram of the accessory unit of the utility model when the load circuit fails;

[0025] Figure 5 It is a structural schematic diagram of the static contact, yoke and armature of the utility model;

[0026] Figure 6 It is an exploded view of the static contact and the magnetic yoke of the utility model;

[0027] Accessory unit 100; accessory unit housing 110; armature 120; first micro switch 130; second micro switch 140; first spring 150; trigger member 160; mating portion 161; trigger portion 162; second spring 163; conductive unit 200; conductive unit housing 210; exhaust structure 211; arc extinguishing chamber 220; static contact 230; static contact 231; extension section 232; contact section 233; bending section 234; wiring section 235; wiring hole 2351; limiting opening 236; arc-starting piece 237; moving contact 240; moving contact 241; yoke 250; bayonet 251; electromagnetic unit 300; coil 310; static iron core 320; moving iron core 330; transmission rod 400. DETAILED DESCRIPTION

[0028] The following embodiments are combined with the accompanying drawings to further illustrate the circuit disconnection structure of the switch device and the specific implementation of the switch device of the utility model. The circuit disconnection structure of the switch device and the switch device of the utility model are not limited to the description of the following embodiments.

[0029] like Figure 1-4As shown, the switch device of this embodiment includes a circuit disconnection structure of the switch device. The circuit disconnection structure of the switch device of this embodiment includes an electromagnetic unit 300 and a conductive unit 200, wherein the conductive unit 200 includes a movable contact 240 and a stationary contact 230, and the electromagnetic unit 300 drives the movable contact 240 and the stationary contact 230 to open and close. In particular, the circuit disconnection structure of the switch device also includes an accessory unit 100 corresponding to the stationary contact 230, wherein the accessory unit 100 includes a first micro switch 130 and a movable armature 120, wherein the armature 120 is arranged opposite to the yoke 250 on the stationary contact 230, and cooperates with the triggering of the first micro switch 130; the electromagnetic unit When the power-carrying circuit of 300 is energized, the electromagnetic unit 300 drives the moving contact 240 and the stationary contact 230 to close to connect the load circuit of the switch device. At this time, the armature 120 does not trigger the first microswitch 130; when the load circuit fails (short circuit or overload), the current of the load circuit increases, so that the electromagnetic force generated by the current at the yoke 250 on the stationary contact 230 increases, and the armature 120 moves under the action of the electromagnetic force to trigger the first microswitch 130 to cut off the power-carrying circuit of the electromagnetic unit 300, so that the electromagnetic unit 300 drives the moving contact 240 and the stationary contact 230 to disconnect to cut off the load circuit. The circuit disconnection structure and switch device of the switch device of this embodiment provide electromagnetic force to the armature 120 by the yoke 250 on the static contact 230 connected to the load circuit of the switch device, so that when a short circuit, overload or other fault occurs in the load circuit, the armature 120 triggers the first micro switch 130 to disconnect the energized circuit of the electromagnetic unit 300, thereby disconnecting the load circuit. The switch device itself has short circuit protection and overload protection functions, does not need to be additionally provided with a fuse, has a simple structure and lowers the cost. The switch device of this embodiment can be a contactor, a circuit breaker, a contactor-type circuit breaker, etc. Triggering the first microswitch 130 of the present embodiment is equivalent to the switch of the power-on circuit of the electromagnetic unit 300, and the first microswitch 130 controls the opening and closing of the power-on circuit of the electromagnetic unit 300; for example, if it is necessary to cut off the power-on circuit of the electromagnetic unit 300 when the first microswitch 130 is not triggered, it is only necessary to connect the two in series; if it is necessary to cut off the power-on circuit of the electromagnetic unit 300 when the first microswitch 130 is triggered, it is only necessary to short-circuit the power-on circuit of the electromagnetic unit 300 (the circuit where the first microswitch 130 is located is connected in parallel with the power-on circuit of the electromagnetic unit 300).

[0030] like Figure 3-4As shown, the accessory unit 100 of this embodiment also includes an accessory unit housing 110, and the accessory unit housing 110 has a cavity for installation. The first micro switch 130 is fixed in the accessory unit housing 110, and the armature 120 is installed in the accessory unit housing 110 so as to slide up and down. The first micro switch 130 is located on the side of the armature 120, and the movement direction of the armature 120 is perpendicular to the movement direction of the trigger rod of the first micro switch 130. The sliding structure between the armature 120 and the accessory unit housing 110 of this embodiment can adopt a sliding protrusion and a sliding groove that slide together. The first micro switch 130 of this embodiment is a standard part, which has a trigger rod. The mounting end at one end of the trigger rod is installed on the micro switch housing, and a trigger gap is left between the trigger end at the other end and the trigger point on the housing. The movement direction of the trigger rod of the first micro switch 130 refers to the direction in which the trigger end moves toward the trigger point, as shown in FIG. Figure 3-4 As shown, the armature 120 moves upward to drive the trigger end of the trigger rod of the first micro switch 130 to swing to the left to trigger the first micro switch 130, and the armature 120 moves downward to drive the trigger end of the trigger rod of the first micro switch 130 to swing to the right to de-trigger the first micro switch 130. Of course, as other embodiments, the moving direction of the armature 120 may not be perpendicular to the moving direction of the trigger rod of the first micro switch 130, the first micro switch 130 may also be set at other positions, and the armature 120 may also be set in a rotatable manner.

[0031] like Figure 3-4 As shown, the accessory unit 100 of this embodiment also includes a first spring 150 for resetting the armature 120; when the load circuit fails, the first spring 150 stores energy; when the load circuit is cut off, the current of the circuit becomes zero, the electromagnetic force generated by the yoke 250 on the static contact 230 disappears, and the first spring 150 releases energy, driving the armature 120 to reset. Preferably, two first springs 150 of this embodiment are provided. Optionally, the first spring 150 is always in a compressed state, and the compression amount of the first spring 150 remains the same when the load circuit is cut off and connected, that is, the position of the armature 120 remains unchanged when the load circuit is cut off and connected (under normal current). There is no electromagnetic force when the load circuit is cut off; when the load circuit is connected (under normal current), the electromagnetic force is less than the reaction force of the first spring 150, so the compression amount of the first spring 150 remains unchanged. The first spring 150 is pre-compressed to a certain extent when it is assembled, so that the first spring 150 is always in a compressed state.

[0032] The accessory unit 100 of the present embodiment also includes a second microswitch 140, and the armature 120 cooperates with the trigger of the second microswitch 140. The second microswitch 140 is used to send a signal that does not represent the state of the load circuit; for example, when the load circuit is connected, the armature 120 triggers the second microswitch 140 to send a "normal line" signal; when the load circuit fails, the armature 120 moves to a position where the second microswitch 140 is not triggered under the electromagnetic force of the yoke 250, so that the second microswitch 140 stops sending the "normal line" signal. The second microswitch 140 is respectively fixed in the accessory unit housing 110, and the armature 120 is located between the yoke 250 and the second microswitch 140, and the movement direction of the armature 120 is parallel to the movement direction of the trigger rod of the second microswitch 140. The second microswitch 140 of the present embodiment is preferably provided with two, and the first spring 150 and the second microswitch 140 are respectively provided on the front and back surfaces of the armature 120 (such as Figure 3-4 On the top and bottom surfaces of the housing 110, optionally, the first spring 150 is always in a compressed state. The second microswitch 140 is fixed below the armature 120, and the trigger rod at the top of the second microswitch 140 is against the bottom surface of the armature 120. The first spring 150 is above the armature 120. The top end of the pre-compressed first spring 150 is connected to the top wall of the accessory unit housing 110, and the bottom end is against the top surface of the armature 120. The second microswitch 140 of this embodiment is a standard part, having a trigger rod. The mounting end of one end of the trigger rod is mounted on the microswitch housing, and a trigger gap is left between the trigger end at the other end and the trigger point on the housing. The movement direction of the trigger rod of the second microswitch 140 refers to the direction in which the trigger end moves toward the trigger point, such as Figure 3-4 The armature 120 shown moves upward to drive the trigger end of the trigger rod of the second micro switch 140 to swing upward to realize that the second micro switch 140 is not triggered. The armature 120 moves downward to drive the trigger end of the trigger rod of the second micro switch 140 to swing downward to realize triggering the second micro switch 140. The setting of the second micro switch 140 can be used to increase the alarm function. The implementation method of the alarm function of the second micro switch 140 of this embodiment can be realized by the prior art. For example, a controller can be provided to process two signals, namely, a signal of "line normal" when the second micro switch 140 is triggered and a signal of stopping sending "line normal" when it is not triggered, and send a control signal. For example, the control signal is transmitted to the indicator light to distinguish between normal and fault through two different colors. The control signal converted from the signal of stopping sending "line normal" can also be transmitted to an alarm such as an alarm indicator light or a buzzer to achieve the alarm effect.

[0033] The accessory unit 100 of this embodiment also includes a trigger member 160, which is installed in the accessory unit housing 110 in a sliding manner up and down. The armature 120 is triggered and matched with the first micro switch 130 through the trigger member 160. The trigger member 160 includes a matching portion 161 and a trigger portion 162 connected to each other. The matching portion 161 of the trigger member 160 is linked to the armature 120, and the trigger portion 162 contacts the trigger rod of the first micro switch 130. The trigger member 160 of this embodiment is used as a component for the armature 120 to trigger and match the first micro switch 130, so that the relative position of the armature 120 and the first micro switch 130 is flexible and adjustable, and the production and manufacturing precision requirements are low. The sliding structure between the trigger member 160 of this embodiment and the accessory unit housing 110 can adopt a sliding protrusion and a sliding groove of sliding matching. The matching portion 161 of the trigger member 160 of this embodiment is a convex block attached to the side of the first micro switch 130, and the trigger portion 162 is an arc-shaped protrusion on the convex block. Of course, as other embodiments, the trigger member 160 can also be a convex point, a round shaft or other structures provided on the armature 120; or the trigger member 160 and the second spring 163 are not provided, and the side of the armature 120 is directly used to trigger the first micro switch 130. The accessory unit 100 of this embodiment also includes a second spring 163 for resetting the trigger member 160; when the load circuit fails, the second spring 163 is compressed to store energy; when the load circuit is cut off, the second spring 163 releases energy to drive the trigger member 160 to reset.

[0034] like Figure 5-6As shown in the figure, the static contact 230 of this embodiment includes an extension section 232 and a contact section 233 arranged vertically. The yoke 250 is installed on the extension section 232 of the static contact 230. A static contact point 231 is provided on the bottom surface of the contact section 233 away from the extension section 232. The accessory unit 100 is located below the extension section 232 and to the side of the contact section 233 of the static contact 230, and is located between the extension section 232 and the arc extinguishing chamber 220. The static contact 230 includes a bending section 234 and a wiring section 235. The bending section 234 is connected between the wiring section 235 and the contact section 233 to form a U-shaped structure. A wiring hole 2351 is provided on the wiring section 235. The wiring section 235 extends to form the extension section 232 protruding from the contact section 233. A limiting opening 236 is provided on the top surface of the extension section 232. The yoke 250 has a bayonet 251 for clamping the extension section 232. The yoke 250 is clamped at the limiting opening 236 of the extension section 232 through the bayonet 251. A magnetic conductive sheet can also be arranged between the wiring section 235 and the contact section 233 inside the bending section 234. The protruding design of the extension section 232 enables the yoke 250 installed on the extension section 232 not to interfere with the magnetic conductive sheet inside the bending section 234, and an installation space for the accessory unit 100 can also be left. The bending section 234 of this embodiment is preferably an arc-shaped bend, and can also be a U-shaped bend, a 冂-shaped bend, an arc-shaped bend and other bending structures, and the angle of the bending section 234 is between 90° and 270°.

[0035] As Figure 2 shown in the figure, the conductive unit 200 of this embodiment further includes an arc extinguishing chamber 220 and a conductive unit housing 210. The moving contact 240, the static contact 230, the arc extinguishing chamber 220, and the accessory unit 100 are installed inside the conductive unit housing 210. The arc extinguishing chamber 220 is located on the side of the moving contact 240. The accessory unit 100 is located below the yoke 250 and above the arc extinguishing chamber 220. The conductive unit 200 of this embodiment is provided with a conductive unit housing 210 so that the moving contact 240, the static contact 230, and the arc extinguishing chamber 220 can be assembled into a conductive component, and multiple conductive components can be set up and assembled into a module. The accessory unit 100 can be integrally installed inside the conductive unit housing 210. The position of the accessory unit 100 in this embodiment includes but is not limited to being located below the yoke 250 and above the arc extinguishing chamber 220, as long as it can cooperate with the yoke 250. Of course, as other embodiments, the conductive unit housing 210 can also not be provided, and the accessory unit 100 can be correspondingly arranged with the yoke 250 on the static contact 230. As Figure 2As shown, the arc extinguishing chamber 220 of this embodiment includes a plurality of arc extinguishing grids, which are arranged in sequence in the up-down direction. An exhaust structure 211 is provided at a position corresponding to the arc extinguishing chamber 220 on the conductive unit housing 210. The exhaust structure 211 includes, but is not limited to, a plurality of slits, and may also include a plurality of circular holes and the like. The static contact 230 is used to contact and cooperate with the moving contact 240 at one end (i.e. Figure 5-6 The contact section 233 in the middle is provided with an arc-striking piece 237 extending into the arc-extinguishing chamber 220.

[0036] like Figure 1 As shown, the switch device of this embodiment is a vehicle switch device, and its structure is similar to the combination of a contactor and a circuit breaker. The electromagnetic unit 300 drives the moving contact 240 and the static contact 230 to open and close through the transmission rod 400. The moving contact 240 and the static contact 230 of the conductive unit 200 are installed in the conductive unit housing 210. The electromagnetic unit 300 includes a coil 310, a static iron core 320, and a moving iron core 330. The transmission rod 400 is linked with the moving iron core 330 and penetrates into the conductive unit housing 210 to connect with the moving contact 240. When the moving iron core 330 moves under the electromagnetic force of the coil 310, the moving contact 240 is driven by the transmission rod 400 to move and cooperate with the static contact 230. The connection or disconnection of the energized circuit of the electromagnetic unit 300 of this embodiment refers to the energization or de-energization of the coil 310. The conductive unit 200 of this embodiment serves as a phase pole of the switch device, and may be provided in plurality. A single electromagnetic unit 300 drives a plurality of conductive units 200 simultaneously through a transmission rod 400 .

[0037] like Figure 2 As shown, the conductive unit 200 of this embodiment has a moving contact 240 and two symmetrical stationary contacts 230, and accordingly, the switch device has two accessory units 100 corresponding to the two stationary contacts 230. The bottom surface of the contact segment 233 of the two stationary contacts 230 has a stationary contact 231, and the moving contact 240 is a bridge-shaped structure, with a moving contact 241 provided on the top surface of both ends, respectively, for correspondingly cooperating with the stationary contacts 231 of the two stationary contacts 230, and the middle part of the moving contact 240 serves as a supporting part, for example, it can be placed on a contact support. When the coil 310 is energized, the moving iron core 330 and the static iron core 320 are attracted, the moving iron core 330 moves upward, and the transmission rod 400 moves upward synchronously, driving the moving contact 240 to move upward and close with the static contact 230 (that is, the moving contact 241 contacts the static contact 231), so that the switch device is closed, that is, the load circuit is connected; when the coil 310 is de-energized, the moving iron core 330 and the static iron core 320 are repelled, the moving iron core 330 moves downward, and the transmission rod 400 moves downward synchronously, driving the moving contact 240 to move downward and disconnect from the static contact 230 (that is, the moving contact 241 is separated from the static contact 231), so that the switch device is opened, that is, the load circuit is cut off.

[0038] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0039] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit disconnection structure of a switch device, comprising an electromagnetic unit (300) and a conductive unit (200), wherein the conductive unit (200) comprises a movable contact (240) and a stationary contact (230), and wherein the electromagnetic unit (300) drives the movable contact (240) and the stationary contact (230) to open and close, characterized in that: The invention also comprises an accessory unit (100) corresponding to the stationary contact (230), wherein the accessory unit (100) comprises a first micro switch (130) and a movable armature (120), wherein the armature (120) is arranged opposite to a yoke (250) on the stationary contact (230) and cooperates with the triggering of the first micro switch (130); when the energized circuit of the electromagnetic unit (300) is energized, the electromagnetic unit (300) drives the movable contact (240) and the stationary contact (230) to close to realize the connection of the load circuit of the switch device, and at this time, the armature (120) does not trigger the first micro switch (130); when a load circuit fault occurs, the armature (120) moves under the electromagnetic force of the yoke (250) to trigger the first micro switch (130) and cut off the energized circuit of the electromagnetic unit (300).

2. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The accessory unit (100) further comprises a second micro switch (140), the armature (120) and the second micro switch (140) are triggered to cooperate, and the second micro switch (140) is used to send a signal that does not represent the state of the load circuit.

3. The circuit disconnection structure of the switch device according to claim 2, characterized in that: The armature (120) is located between the yoke (250) and the second micro switch (140), and the moving direction of the armature (120) is parallel to the moving direction of the trigger rod of the second micro switch (140); the first micro switch (130) is located on the side of the armature (120), and the moving direction of the armature (120) is perpendicular to the moving direction of the trigger rod of the first micro switch (130).

4. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The accessory unit (100) further comprises a first spring (150) for resetting the armature (120); when a load circuit fails, the first spring (150) stores energy; when the load circuit is cut off, the first spring (150) releases energy to drive the armature (120) to reset.

5. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The accessory unit (100) further comprises a trigger member (160), the armature (120) is triggered and matched with the first micro switch (130) through the trigger member (160), the trigger member (160) comprises a matching portion (161) and a trigger portion (162) connected to each other, the matching portion (161) of the trigger member (160) is linked to the armature (120), and the trigger portion (162) contacts the trigger rod of the first micro switch (130).

6. The circuit disconnection structure of the switch device according to claim 5, characterized in that: The accessory unit (100) further comprises a second spring (163) for resetting the trigger member (160); when a load circuit fails, the second spring (163) is compressed to store energy; when the load circuit is cut off, the second spring (163) releases energy to drive the trigger member (160) to reset.

7. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The accessory unit (100) further comprises an accessory unit housing (110), the first micro switch (130) is fixed in the accessory unit housing (110), and the armature (120) is slidably mounted in the accessory unit housing (110).

8. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The stationary contact (230) comprises an extension section (232) and a contact section (233) arranged in an upper and lower manner, wherein the yoke (250) is mounted on the extension section (232) of the stationary contact (230), a stationary contact point (231) is arranged on the bottom surface of the contact section (233) away from the extension section (232), and the accessory unit (100) is located below the extension section (232) of the stationary contact (230) and to the side of the contact section (233).

9. The circuit disconnection structure of the switch device according to claim 8, characterized in that: The stationary contact (230) comprises a bending section (234) and a wiring section (235); the bending section (234) is connected between the wiring section (235) and the contact section (233) to form a U-shaped structure; the wiring section (235) extends to form the extension section (232) protruding from the contact section (233); a limiting opening (236) is provided on the top surface of the extension section (232); the yoke (250) has a clamping opening (251) for clamping the extension section (232); and the yoke (250) is clamped at the limiting opening (236) of the extension section (232) through the clamping opening (251).

10. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The conductive unit (200) further comprises an arc extinguishing chamber (220) and a conductive unit housing (210); the movable contact (240), the stationary contact (230), the arc extinguishing chamber (220), and the accessory unit (100) are installed in the conductive unit housing (210); the arc extinguishing chamber (220) is located on the side of the movable contact (240), and the accessory unit (100) is located below the yoke (250) and above the arc extinguishing chamber (220).

11. The circuit disconnection structure of the switch device according to claim 10, characterized in that: The arc extinguishing chamber (220) comprises a plurality of arc extinguishing grids (221), the plurality of arc extinguishing grids (221) being arranged in sequence in the up-down direction, an exhaust structure (211) being provided at a position corresponding to the arc extinguishing chamber (220) on the conductive unit housing (210); an arc striking piece (237) extending into the arc extinguishing chamber (220) is provided at one end of the static contact (230) for contacting and cooperating with the moving contact (240).

12. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The switch device is a vehicle switch device. The electromagnetic unit (300) drives the moving contact (240) and the static contact (230) to open and close through a transmission rod (400). The moving contact (240) and the static contact (230) of the conductive unit (200) are installed in a conductive unit housing (210). The electromagnetic unit (300) comprises a coil (310), a static iron core (320), and a moving iron core (330). The transmission rod (400) is linked to the moving iron core (330) and penetrates into the conductive unit housing (210) to be connected with the moving contact (240). When the moving iron core (330) moves under the electromagnetic force of the coil (310), it drives the moving contact (240) to move and cooperate with the static contact (230) through the transmission rod (400).

13. The circuit disconnection structure of the switch device according to claim 1, characterized in that: The conductive unit (200) has a movable contact (240) and two symmetrical stationary contacts (230); the switch device has two accessory units (100) corresponding to the two stationary contacts (230); the bottom surfaces of the two stationary contacts (230) have a stationary contact point (231); the movable contact (240) is a bridge-shaped structure, and a movable contact point (241) is provided on the top surfaces of both ends, respectively, for correspondingly cooperating with the stationary contacts (231) of the two stationary contacts (230).

14. A switchgear, characterized in that: A circuit disconnection structure comprising a switch device according to any one of claims 1-13.

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