Contactor

Abstract

A contactor comprises a first function module, a second function module and a third function module, the second function module is arranged between the first function module and the third function module, the first function module is provided with a coil of an electromagnetic system, and the electromagnetic system comprises a movable iron core and a coil used for driving the movable iron core to move. The second function module comprises a contact system and a contact wiring terminal, the contact system comprises a static contact and a moving contact, the moving contact is installed on a contact support driven by the electromagnetic system, a moving iron core of the electromagnetic system is connected with the contact support, the static contact is connected with the working circuit through the contact wiring terminal, and the moving iron core of the electromagnetic system is connected with the working circuit. The third function module is provided with a coil wiring terminal, the second function module further comprises a coil connecting structure used for electrically connecting the coil wiring terminal and the coil, the coil is connected with the coil wiring terminal through the coil connecting structure, the layout is reasonable, and wiring and operation are more convenient.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a contactor. Background Art

[0002] The development trend of existing contactors is towards miniaturization of volume, compactness of structure, internalization of accessories, convenience of wiring, and diversification of functions.

[0003] However, the layout of existing contactors is unreasonable, resulting in troublesome wiring between internal contactors and also troublesome external wiring of contactors. In addition, as the functions of contactors increase, more auxiliary modules are added, leading to not only an increasing volume of contactors but also very troublesome operation. Summary of the Invention

[0004] The purpose of the utility model is to overcome at least one defect of the prior art and provide a contactor.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A contactor includes a first functional module, a second functional module, and a third functional module. The second functional module is arranged between the first functional module and the third functional module.

[0007] The first functional module is provided with a coil of an electromagnetic system. The electromagnetic system includes a moving iron core and a coil for driving the moving iron core to move.

[0008] The second functional module includes a contact system and contact terminal blocks. The contact system includes a static contact and a moving contact. The moving contact is installed on a contact support driven by the electromagnetic system. The moving iron core of the electromagnetic system is connected to the contact support. The static contact is connected to the working circuit through the contact terminal blocks.

[0009] The third functional module is provided with coil terminal blocks. The second functional module further includes a coil connection structure for electrically connecting the coil terminal blocks and the coil. The coil is connected to the coil terminal blocks through the coil connection structure.

[0010] Preferably, the second functional module includes a base and a cover sleeved outside the base. The contact system is arranged inside the base, and the coil connection structure is located between the outside of the base and the inside of the cover.

[0011] Preferably, the third functional module is provided with two coil terminal blocks, and the two coil terminal blocks are respectively directly above the two wiring positions of the coil.

[0012] Preferably, the coil connection structure includes a first conductive part connected to the coil and a second conductive part connected to the coil terminal blocks. The first conductive part is connected to the second conductive part.

[0013] Preferably, the first conductive member includes a clamping elastic piece, the clamping elastic piece includes an elastic contact portion, and a connecting portion located on the side of the contact portion, the connecting portion is used to connect the coil, and the second conductive member is inserted and connected with the clamping elastic piece.

[0014] Preferably, the coil terminal includes a coil connection piece, a coil pressing piece and a coil connection screw. The coil connection screw passes through the coil pressing piece and is connected to the coil connection piece. The coil connection screw is used to drive the coil pressing piece to press the wire against the coil connection piece, and the coil connection piece is integrally formed with the second conductive member.

[0015] Preferably, a coil wire groove is provided on the side surface of the base, and the coil wire groove is used to accommodate the coil connection structure.

[0016] Preferably, the third functional module includes an auxiliary module, and the auxiliary module includes one or any combination of a interlock module, an auxiliary contact module and a surge protection module.

[0017] Preferably, the third functional module is provided with an interlock module. The interlock module and two coil terminals are oppositely arranged on both sides of the third functional module. Two auxiliary contact modules are arranged between the interlock module and the two coil terminals, and a surge protection module is arranged between the two coil terminals.

[0018] Preferably, an auxiliary contact module is provided in the third functional module. The contact support is provided with an auxiliary support portion inserted into the third functional module. The auxiliary contact module includes two auxiliary static contacts arranged at intervals, and auxiliary connection terminals respectively arranged on the auxiliary static contacts. The auxiliary support portion is inserted between the two auxiliary static contacts of the auxiliary contact module. An auxiliary moving contact is provided on the auxiliary support portion. When the contact support drives the moving contact to contact and separate from the static contact, the auxiliary moving contact can be driven to move to contact and separate from the auxiliary static contact at the same time, so that the auxiliary contact module switches the output state.

[0019] Preferably, an auxiliary support groove is provided on the auxiliary support portion. Auxiliary spring platforms for fixing the auxiliary contact spring and auxiliary limiting surfaces for limiting the auxiliary moving contact are respectively provided on two opposite groove walls of the auxiliary support groove. The auxiliary contact spring pushes the middle part of the auxiliary moving contact, so that the middle part of the auxiliary moving contact is limited by the auxiliary limiting surface. The two ends of the auxiliary moving contact respectively extend to both sides of the auxiliary support portion. When the auxiliary moving contact contacts the auxiliary static contact, the auxiliary contact spring is compressed and pushes the auxiliary moving contact, so that the auxiliary moving contact is pressed against the auxiliary static contact.

[0020] Preferably, it includes two of the auxiliary contact modules, and the two auxiliary contact modules are respectively a normally open contact and a normally closed contact. There are two auxiliary support grooves corresponding to the two auxiliary contact modules respectively on the auxiliary support part. Auxiliary moving contacts are respectively arranged in the two auxiliary support grooves. The two auxiliary moving contacts are at different heights. One of the auxiliary moving contacts contacts the corresponding auxiliary static contact to form a normally closed contact, and the other auxiliary moving contact is separated from the corresponding auxiliary static contact to form a normally open contact.

[0021] Preferably, an interlock module is provided in the third function module. The interlock module includes a bracket and an interlock member rotatably arranged on the bracket. The interlock member includes a pivot part rotatably connected to the bracket, and a first locking part and a second locking part oppositely arranged on both sides of the pivot part. The first locking part extends outside the contactor and is used to insert into an adjacent contactor and cooperate with the contact support of the adjacent contactor. The second locking part cooperates with the contact support of the contactor where it is located. When one contactor is closed, the contact support of the other contactor is locked through the interlock member, so that the other contactor cannot be closed either.

[0022] Preferably, the second function module includes a base and a cover sleeved outside the base. The third function module includes a face cover. The cover is snap-fitted onto the base along a first direction, and the face cover is snap-fitted onto the cover along a second direction, or snap-fitted onto a structure outside the cover extending from the base. The first direction and the second direction are perpendicularly arranged.

[0023] Preferably, a sealing hole is provided on the face cover, and a detachable sealing plug for plugging into the sealing hole.

[0024] Preferably, the first function module, the second function module, and the third function module are sequentially arranged along the height direction of the contactor. In the length direction of the contactor, the length of the third function module is less than the length of the second function module. Screw holes corresponding to the contact terminal are respectively provided at both ends in the length direction of the top surface of the second function module.

[0025] For the contactor of the present utility model, by providing a coil connection structure for electrically connecting the coil terminal and the coil in the second function module and integrating the coil terminal in the third function module at the top, not only is the layout more reasonable, but also the wiring and operation are more convenient.

[0026] In addition, by providing an auxiliary module in the third function module, the coil terminal and the auxiliary module can be integrated together. The wiring and operation of the third function module at the top are more convenient, and the customer has better recognition during use.

[0027] In addition, the two coil connection terminals are respectively located directly above the two connection positions of the coil. By arranging the coil connection terminals in the third functional module, the coil connection terminals can be located directly above the connection positions of the coil, facilitating wire routing.

[0028] In addition, the coil connection structure is located between the outer side of the base and the inner side of the cover. There is no need to additionally set up an insulating structure for insulating the coil connection structure. It can not only insulate the coil connection structure from the contact system inside the base, but also enable the cover buckled on the base to cover the second conductive part, playing a role in insulating the coil connection structure. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the contactor of the present utility model;

[0030] Figure 2 is a schematic structural diagram of the contactor of the present utility model after hiding the face cover;

[0031] Figure 3 is an assembly schematic diagram of the cover of the contactor of the present utility model;

[0032] Figure 4 is a schematic diagram of the cooperation between the interlock module of the present utility model and two contactors;

[0033] Figure 5 is the present utility model Figure 4 partial enlarged view;

[0034] Figure 6 is a schematic structural diagram of the contact support of the present utility model;

[0035] In the figure, the first functional module 1; the second functional module 2; the third functional module 3; the coil connection terminal 31; the face cover 32; the interlock module 33; the auxiliary contact module 34; the surge protection module 35; the base 21; the cover 22; the contact connection terminal 23; the static contact 24; the contact support 25; the coil connection structure 26; the first conductive part 261; the second conductive part 262; the coil wire routing groove 210; the clamping elastic piece 263; the contact part 264; the connection part 265; the coil connection piece 311; the coil pressing piece 312; the coil connection screw 313; the auxiliary support part 251; the auxiliary static contact 341; the auxiliary connection terminal 342; the auxiliary moving contact 343; the auxiliary support groove 252; the auxiliary spring platform 253; the auxiliary limiting surface 254; the sealing plug 321; the interlock part 331; the pivoting part 332; the first locking part 333; the second locking part 334; the sliding part 255. Detailed Embodiments

[0036] The following embodiments given in conjunction with the accompanying drawings further illustrate the specific implementation manners of the contactor of the present utility model. The contactor of the present utility model is not limited to the descriptions of the following embodiments.

[0037] As Figures 1-3 shown, the contactor of this embodiment is divided according to a hierarchical structure, and its main structure is divided into upper, middle, and lower three-layer structures. The three-layer structures are respectively the first functional module 1, the second functional module 2, and the third functional module 3 sequentially arranged in the housing. The second functional module 2 is located between the first functional module 1 and the third functional module 3;

[0038] The first functional module 1 includes a base and an electromagnetic system (coils not shown in the figure) arranged in the base. The electromagnetic system includes a moving iron core and a coil for driving the moving iron core to move. Outside the base, there is an installation structure (not shown in the figure). The installation structure is used to install the contactor in the working position, and the installation structure can include rail installation and screw installation holes;

[0039] The third functional module 3 includes an auxiliary module and two coil terminal blocks 31 for connecting the control circuit, and a face cover 32 covering the auxiliary module and the two coil terminal blocks 31. The auxiliary module includes one or any combination of a interlock module 33, an auxiliary contact module 34, and a surge protection module 35;

[0040] The second functional module 2 includes a base 21 installed on the first functional module 1 and a cover 22 sleeved outside the base 21. In the base 21, there are a contact system, an arc extinguishing system (not shown in the figure), and contact terminal blocks 23 electrically connected to the contact system. The contact system includes at least one moving contact, and two static contacts 24 respectively arranged at both ends of the moving contact. The moving contact is installed on a contact support 25 driven by the electromagnetic system. The contact support 25 drives the moving contact to contact and separate from the corresponding two static contacts 24 under the drive of the electromagnetic system, so that the two static contacts 24 are conducted or disconnected through the moving contact. One end of the static contact 24 far from the corresponding moving contact extends outside the base 21 and is connected to the contact terminal block 23. The contact support 25 is slidably arranged in the second functional module 2. The moving iron core of the electromagnetic system is connected to the contact support 25 and drives the contact support 25 to move linearly up and down. The moving iron core is located at the connection between the third functional module 3 and the second functional module 2 and can be located inside the second functional module 2 or the third functional module 3; The contact support 25 moves linearly, and its bottom can move to the connection between the third functional module 3 and the second functional module 2, or move inside the first functional module 1, and its top can move inside the third functional module 3. The base of the first functional module 1, the base 21 of the second functional module 2, the cover 22 of the second functional module 2, and the face cover 32 of the third functional module 3 constitute the housing of the contactor.

[0041] AsFigure 3 As shown in the figure, an improvement point of this embodiment lies in that the second functional module 2 includes a coil terminal 31 for electrically connecting the third functional module 3 and a coil connection structure 26 of the coil. The two ends of the coil are respectively connected to the two coil terminals 31 through the coil connection structure 26 to access the control circuit. The control circuit drives the moving iron core to act by controlling the coil, so that the iron core drives the moving contact to contact and separate from the static contact 24, so as to conduct and disconnect the working circuit accessed by the contact terminal 23 respectively.

[0042] For the contactor of this embodiment, by arranging the coil connection structure 26 for electrically connecting the coil terminal 31 and the coil in the second functional module 2 and integrating the coil terminal 31 into the third functional module 3 at the top, not only is the layout more reasonable, but also the wiring and operation are more convenient.

[0043] In addition, by arranging an auxiliary module in the third functional module 3, the coil terminal 31 and the auxiliary module can be integrated together, making the wiring and operation of the third functional module 3 at the top more convenient, and the customer has better recognition when using.

[0044] Furthermore, the two coil terminals 31 are respectively located directly above the two wiring positions of the coil. Setting the coil terminals 31 in the third functional module 3 enables the coil terminals 31 to be located directly above the wiring positions of the coil, facilitating wire routing.

[0045] Furthermore, the coil connection structure 26 is located between the outer side of the base 21 and the inner side of the cover 22. There is no need to additionally arrange an insulating structure for insulating the coil connection structure 26. Not only can the coil connection structure 26 be insulated from the contact system inside the base 21, but also the cover 22 buckled on the base 21 can cover the second conductive part, playing a role of insulating the coil connection structure 26. Of course, the coil connection structure 26 can also pass through the inside of the base 21, but an insulating structure needs to be added outside the coil connection structure 26. Preferably, the side surface of the base 21 is provided with a coil wire groove 210, and the coil wire groove 210 is used to accommodate the coil connection structure 26.

[0046] Furthermore, the coil connection structure 26 includes two first conductive parts 261 respectively connected to the two ends of the coil, and two second conductive parts 262 respectively connected to the two coil terminals 31, and the two first conductive parts 261 and the two second conductive parts 262 are respectively connected. Specifically, the first conductive part 261 includes a clamping elastic piece 263, the clamping elastic piece 263 includes an elastic contact part 264 and a connecting part 265 located on the side of the contact part 264, the connecting part 265 is used to connect the coil, and the second conductive part 262 is inserted and connected with the clamping elastic piece 263, which is convenient for assembly;

[0047] The coil terminal 31 includes a coil connection piece 311, a coil pressing piece 312, and a coil connection screw 313. The coil connection screw 313 passes through the coil pressing piece 312 and is connected to the coil connection piece 311. The coil connection screw 313 is used to drive the coil pressing piece 312 to press the wire tightly against the coil connection piece 311. The coil connection piece 311 is integrally formed with the corresponding second conductive member 262, which can reduce the assembly difficulty and eliminate the process of connecting the second conductive member 262 to the coil terminal 31. Obviously, as other embodiments, the coil connection structure 26 can also adopt a non-plug-in structure, which all fall within the protection scope of the present invention.

[0048] As Figure 2 shown, the first functional module 1, the second functional module 2, and the third functional module 3 are arranged in sequence along the height direction of the contactor. In the length direction of the contactor, the length of the third functional module 3 is less than the length of the second functional module 2, so that screw holes corresponding to the contact terminals 23 are respectively provided at both ends of the top surface of the second functional module 2 in the length direction of the contactor. The third functional module 3 is provided with an interlock module 33. The interlock module 33 is spaced apart from the two coil terminals 31. In the width direction of the contactor, the interlock module 33 and the two coil terminals 31 are oppositely arranged on both sides of the third functional module 3. Two auxiliary contact modules 34 are provided between the interlock module 33 and the two coil terminals 31. A surge protection module 35 is provided between the two coil terminals 31.

[0049] For the contactor of this embodiment, on the basis of realizing functional area modularization through the first functional module 1, the second functional module 2, and the third functional module 3, the third functional module 3 is further divided into areas according to the functions of different auxiliary modules, so that a variety of auxiliary modules can be built into the third functional module 3. In addition, the auxiliary contact modules 34 are arranged on the sides of the two coil terminals 31, which is convenient for the installation and connection of the externally connected series resistance module. It can be understood that only one of the auxiliary modules can be set, or a combination of multiple auxiliary modules can be set, which all fall within the protection scope of the present invention.

[0050] Further, as Figure 2 、 6As shown, the contact support 25 is provided with a sliding portion 255. An auxiliary support portion 251 is provided on the sliding portion 255 and inserted into the third functional module 3. The auxiliary contact module 34 includes two auxiliary static contacts 341 arranged at intervals and auxiliary connection terminals 342 respectively arranged on the auxiliary static contacts 341. The auxiliary support portion 251 is inserted between the two auxiliary static contacts 341 of the auxiliary contact module 34. An auxiliary moving contact 343 for electrically connecting with the two auxiliary static contacts 341 is provided on the auxiliary support portion 251. When the contact support 25 drives the moving contact to contact and separate from the static contact 24, it can simultaneously drive the auxiliary moving contact 343 to move and contact and separate from the auxiliary static contact 341, so as to switch the output state of the auxiliary contact module 34.

[0051] Further, an auxiliary support groove 252 is provided on the auxiliary support portion 251. Auxiliary spring platforms 253 (auxiliary springs not shown in the figure) for fixing the auxiliary contact spring are respectively provided on two opposite groove walls of the auxiliary support groove 252, and an auxiliary limiting surface 254 for limiting the auxiliary moving contact 343 is provided. The auxiliary contact spring is used to push the middle part of the auxiliary moving contact 343, so that the middle part of the auxiliary moving contact 343 is limited by the auxiliary limiting surface 254. The two ends of the auxiliary moving contact 343 respectively extend to both sides of the auxiliary support portion 251. When the auxiliary moving contact 343 contacts the auxiliary static contact 341, the auxiliary contact spring is compressed and pushes the auxiliary moving contact 343, so that the auxiliary moving contact 343 is pressed against the auxiliary static contact 341.

[0052] The contactor of this embodiment has two auxiliary contact modules 34, and the two auxiliary contact modules 34 are respectively normally open contacts and normally closed contacts. Two auxiliary support grooves 252 corresponding to the two auxiliary contact modules 34 are provided on the auxiliary support portion 251. Auxiliary moving contacts 343 are respectively provided in the two auxiliary support grooves 252. The two auxiliary support grooves 252 are located at different heights, so that the two auxiliary moving contacts 343 are located at different heights. One of the auxiliary moving contacts 343 contacts the corresponding auxiliary static contact 341 to form a normally closed contact, and the other auxiliary moving contact 343 separates from the corresponding auxiliary static contact 341 to form a normally open contact. When the auxiliary moving contact 343 of the normally open auxiliary contact contacts the corresponding auxiliary static contact 341, the auxiliary moving contact 343 of the normally closed auxiliary contact separates from the corresponding auxiliary static contact 341.

[0053] This can avoid setting the normally open and normally closed auxiliary contacts at different heights, and thus can achieve the simultaneous setting of the normally open and normally closed auxiliary contacts in the third function module 3, effectively reducing the height of the third function module 3. This not only makes the structure of the auxiliary contacts more compact, but also enables the height of the third function module 3 to meet the dimensional requirements after combination with the first function module 1 and the second function module 2. Of course, it can also be achieved by other means. For example, setting the two auxiliary contact modules 34 at different heights will increase the height of the third function module 3, and all these belong to the protection scope of the present utility model. In addition, the two auxiliary contact modules 34 can also be both normally open contacts or both normally closed contacts; the contactor can also be provided with one or more auxiliary contact modules 34.

[0054] As Figure 3 shown, the cover 22 is snap-fitted onto the base 21 in the first direction, and the face cover 32 is snap-fitted onto the cover 22 in the second direction, or snap-fitted onto the structure outside the cover 22 that extends from the base 21. The first direction and the second direction are perpendicularly arranged, which is not only convenient for assembly, but also enables the face cover 32 to play a role in limiting the cover 22.

[0055] Furthermore, the face cover 32 is of an integral structure or a split structure. The split face cover 32 is provided with a sealing hole corresponding to the surge protection module 35, and a detachable sealing plug 321 for plugging into the sealing hole, which can facilitate the installation and disassembly of the electronic circuit board of the surge protection module 35.

[0056] As Figures 4-5 shown, the interlock module 33 includes a bracket and an interlock member 331 rotatably arranged on the bracket. The bracket is fixedly arranged inside the housing of the contactor. In this embodiment, the bracket is located in the third function module 3 at the top of the contactor. The interlock member 331 includes a pivot portion 332 rotatably connected to the bracket, and a first locking portion 333 and a second locking portion 334 oppositely arranged on both sides of the pivot portion 332. The first locking portion 333 extends outside the contactor for inserting into an adjacent contactor and cooperating with the contact support 25 of the adjacent contactor. The second locking portion 334 cooperates with the contact support 25 of the current contactor. When one of the contactors and the adjacent contactor is closed, the contact support 25 of the other contactor is locked by the interlock member 331, so that the locked contactor cannot be closed either, preventing the two contactors from being closed simultaneously and realizing the interlock of the two contactors.

[0057] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is customarily placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0058] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A contactor, comprising a first functional module (1), a second functional module (2) and a third functional module (3), wherein the second functional module (2) is arranged between the first functional module (1) and the third functional module (3), The first functional module (1) is provided with a coil of an electromagnetic system, wherein the electromagnetic system comprises a moving iron core and a coil for driving the moving iron core to move. The second functional module (2) comprises a contact system and a contact terminal (23), wherein the contact system comprises a stationary contact (24) and a moving contact, wherein the moving contact is mounted on a contact support (25) driven by an electromagnetic system, wherein the moving iron core of the electromagnetic system is connected to the contact support (25), and the stationary contact (24) is connected to a working circuit via the contact terminal (23). Features: The third functional module (3) is provided with a coil connection terminal (31), and the second functional module (2) further comprises a coil connection structure (26) for electrically connecting the coil connection terminal (31) and the coil, and the coil is connected to the coil connection terminal (31) via the coil connection structure (26).

2. The contactor according to claim 1, characterized in that: The second functional module (2) comprises a base (21) and a cover (22) sleeved on the outside of the base (21); the contact system is arranged on the inside of the base (21); and the coil connection structure (26) is located between the outside of the base (21) and the inside of the cover (22).

3. The contactor according to claim 1, characterized in that: The third functional module (3) is provided with two coil connection terminals (31), and the two coil connection terminals (31) are respectively located directly above two connection positions of the coil.

4. The contactor according to claim 1, characterized in that: The coil connection structure (26) comprises a first conductive member (261) connected to the coil, and a second conductive member (262) connected to the coil connection terminal (31), wherein the first conductive member (261) is connected to the second conductive member (262).

5. The contactor according to claim 4, characterized in that: The first conductive member (261) comprises a clamping spring sheet (263), the clamping spring sheet (263) comprises an elastic contact portion (264), and a connecting portion (265) located on a side of the contact portion (264), the connecting portion (265) being used to connect the coil, and the second conductive member (262) is plug-connected to the clamping spring sheet (263).

6. The contactor according to claim 4, characterized in that: The coil terminal (31) comprises a coil connection piece (311), a coil wire pressing piece (312) and a coil connection screw (313); the coil connection screw (313) passes through the coil wire pressing piece (312) and is connected to the coil connection piece (311); the coil connection screw (313) is used to drive the coil wire pressing piece (312) to press the wire tightly onto the coil connection piece (311); the coil connection piece (311) and the second conductive member (262) are integrally formed.

7. The contactor according to claim 2, characterized in that: A coil wiring groove (210) is provided on the side surface of the base (21), and the coil wiring groove (210) is used to accommodate the coil connection structure (26).

8. The contactor according to claim 1, characterized in that: The third functional module (3) includes an auxiliary module, and the auxiliary module includes one of an interlocking module (33), an auxiliary contact module (34) and a surge protection module (35), or any combination of multiple thereof.

9. The contactor according to claim 1, characterized in that: The third functional module (3) is provided with an interlocking module (33), the interlocking module (33) and the two coil connection terminals (31) are arranged on both sides of the third functional module (3) in a manner opposite to each other, two auxiliary contact modules (34) are arranged between the interlocking module (33) and the two coil connection terminals (31), and a surge protection module (35) is arranged between the two coil connection terminals (31).

10. The contactor according to claim 1, characterized in that: The third functional module (3) is provided with an auxiliary contact module (34); the contact support (25) is provided with an auxiliary support portion (251) inserted into the third functional module (3); the auxiliary contact module (34) comprises two auxiliary static contacts (341) arranged at intervals, and auxiliary wiring terminals (342) respectively arranged on the auxiliary static contacts (341); the auxiliary support portion (251) is inserted between the two auxiliary static contacts (341) of the auxiliary contact module (34); an auxiliary moving contact (343) is provided on the auxiliary support portion (251); when the contact support (25) drives the moving contact to contact and separate from the static contact (24), it can simultaneously drive the auxiliary moving contact (343) to move to contact and separate from the auxiliary static contact (341), so that the auxiliary contact module (34) switches the output state.

11. The contactor according to claim 10, characterized in that: The auxiliary support portion (251) is provided with an auxiliary support groove (252), and two opposite groove walls of the auxiliary support groove (252) are respectively provided with an auxiliary spring platform (253) for fixing an auxiliary contact spring, and an auxiliary limiting surface (254) for limiting the auxiliary moving contact (343). The auxiliary contact spring pushes the middle part of the auxiliary moving contact (343) so that the middle part of the auxiliary moving contact (343) is limited by the auxiliary limiting surface (254), and the two ends of the auxiliary moving contact (343) extend to the two sides of the auxiliary support portion (251) respectively. When the auxiliary moving contact (343) contacts the auxiliary static contact (341), the auxiliary contact spring is compressed and pushes the auxiliary moving contact (343) so that the auxiliary moving contact (343) is pressed tightly against the auxiliary static contact (341).

12. The contactor according to claim 11, characterized in that: The invention comprises two auxiliary contact modules (34), and the two auxiliary contact modules (34) are respectively a normally open contact and a normally closed contact. The auxiliary support portion (251) is provided with two auxiliary support grooves (252) corresponding to the two auxiliary contact modules (34), and the two auxiliary support grooves (252) are respectively provided with auxiliary moving contacts (343). The two auxiliary moving contacts (343) are located at different heights, and one of the auxiliary moving contacts (343) contacts the corresponding auxiliary static contact (341) to form a normally closed contact, so that the other auxiliary moving contact (343) is separated from the corresponding auxiliary static contact (341) to form a normally open contact.

13. The contactor according to claim 1, characterized in that: The third functional module (3) is provided with an interlocking module (33), the interlocking module (33) comprising a bracket and an interlocking member (331) rotatably arranged on the bracket, the interlocking member (331) comprising a pivoting portion (332) rotatably connected to the bracket, and a first locking portion (333) and a second locking portion (334) relatively arranged on both sides of the pivoting portion (332), the first locking portion (333) extending outside the contactor for being inserted into an adjacent contactor and cooperating with a contact support (25) of the adjacent contactor, the second locking portion (334) cooperating with a contact support (25) of the contactor, and when one of the contactors is closed, the contact support (25) of the other contactor is locked by the interlocking member (331), so that the contactor cannot also be closed.

14. The contactor according to claim 1, characterized in that: The second functional module (2) comprises a base (21) and a cover (22) sleeved on the outside of the base (21); the third functional module (3) comprises a cover (32); the cover (22) is snap-fitted onto the base (21) along a first direction; the cover (32) is snap-fitted onto the cover (22) along a second direction, or is snap-fitted onto the base (21) and extends onto an outer structure of the cover (22); the first direction is perpendicular to the second direction.

15. The contactor according to claim 14, characterized in that: The surface cover (32) is provided with a sealing hole and a detachable sealing plug (321) for plugging into the sealing hole.

16. The contactor according to claim 1, characterized in that: The first functional module (1), the second functional module (2) and the third functional module (3) are arranged in sequence along the height direction of the contactor; the length of the third functional module (3) in the length direction of the contactor is shorter than the length of the second functional module (2); and screw holes corresponding to the contact terminals (23) are respectively provided at both ends of the top surface of the second functional module (2) in the length direction of the contactor.

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