A multifunctional AC contactor

Abstract

The present invention discloses a multifunctional AC contactor, which relates to the field of electrical science. This new type of 95A multifunctional AC contactor includes an AC contactor, which comprises a contact system, a connection bracket system, an arc extinguishing system, an electromagnetic system, a mounting base, a contact protection device and an independent wiring terminal module. The contact system, the electromagnetic system and the contact protection device are arranged on the top of the mounting base. The arc extinguishing system is fixedly connected to the contact system. The connection bracket system is arranged on the top of the contact system. The number of independent wiring terminal modules is two, and they are arranged on both sides of the contact protection device. This new type of 95A multifunctional AC contactor has the advantages of small volume, modular design, multiple installation methods, high protection level, high electrical safety performance, strong scalability, diverse wiring types, and novel overall appearance. It can remotely connect and disconnect circuits with AC-3 service category, rated operating voltage of 380V, and rated operating current up to 95A.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical engineering, and particularly to a multifunctional AC contactor. Background Art

[0002] With the increasing load density of the power distribution system and the market demand for miniaturization of distribution cabinets, electrical components with small size and large current are required to meet these market demands.

[0003] At present, AC contactors with AC-3 service category and rated working current up to 95A at rated working voltage of 380V in China have the following defects: large volume and low utilization rate of the cabinet space; the main and auxiliary circuits are designed on the same layer, the circuit wiring layout is not clear, and the coil control circuit wiring is designed at the bottom layer of the main and auxiliary circuit wiring. When the AC contactor is installed and used vertically, it is inconvenient for users to wire, and the protection performance, electrical safety performance and scalability are poor. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention discloses a multifunctional AC contactor to solve the problems raised in the above background art.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: a multifunctional AC contactor, including an AC contactor, the AC contactor includes a contact system, a connection bracket system, an arc extinguishing system, an electromagnetic system, a mounting base, a contact protection device and an independent wiring terminal module;

[0008] The contact system, the electromagnetic system and the contact protection device are arranged on the top of the mounting base, the arc extinguishing system is fixedly connected to the contact system, the connection bracket system is arranged on the top of the contact system, and the contact system, the connection bracket system, the arc extinguishing system and the electromagnetic system are all arranged inside the contact protection device. The number of the independent wiring terminal modules is two and they are arranged on both sides of the contact protection device.

[0009] Preferably, the mounting base includes a base, the upper surface of the base is provided with mounting blocks and block springs, and the upper surface of the base is provided with TH35mm standard card rails, TH75mm standard card rails, screw mounting holes, mounting holes, derivative product fixing holes, dovetail grooves and appearance cavities, and the mounting holes are provided with forming screws.

[0010] Preferably, the contact system includes a first housing and a second housing. The first housing and the second housing are fixedly connected through a forming screw and a mounting hole. A static main contact is fixedly connected between the first housing and the second housing. On the upper outer surfaces of the first housing and the second housing, there are respectively provided a first expansion module fixing window, an expansion module fixing boss, a normally closed auxiliary contact fixing window, a normally open auxiliary contact fixing window, an expansion module hanging slot, and an arc extinguishing device fixing window. On the lower outer surfaces of the first housing and the second housing, there are respectively provided a clamping groove, a first clamping hook, a second expansion module fixing window, a contact protection system fixing window, and an expansion module clamping slot. And three groups of static main contacts are respectively inlaid on the lower layers of the first housing and the second housing, and a group of static normally open auxiliary contacts and a group of static normally closed auxiliary contacts are respectively inlaid on the upper layers. And the normally closed auxiliary contact fixing window and the normally open auxiliary contact fixing window are respectively fixedly connected with the static normally open auxiliary contact and the static normally closed auxiliary contact.

[0011] Preferably, the electromagnetic system includes a direct-acting "E"-type self-locking laminated silicon steel sheet moving iron, a coil, a reaction spring, and an "E"-type self-locking laminated silicon steel sheet static iron. The "E"-type self-locking laminated silicon steel sheet static iron is clamped on the upper surface of the inner cavity of the base. The direct-acting "E"-type self-locking laminated silicon steel sheet moving iron, the coil, and the reaction spring are arranged on the top of the "E"-type self-locking laminated silicon steel sheet static iron. The "E"-type self-locking laminated silicon steel sheet moving iron is fixedly connected to the bottom of the leaf spring.

[0012] Preferably, the connection bracket system includes a main contact bracket. The main contact bracket is fixedly connected to the top of the leaf spring. A main contact spring is fixedly connected inside the main contact bracket. And a moving contact main bridge-shaped contact is fixedly connected to the bottom of the main contact spring. Expansion module connection windows are arranged on both sides of the main contact bracket, and a moving contact auxiliary bridge-shaped contact, a mounting groove-shaped guide rail, an auxiliary contact bracket, a first expansion module hanging interface, and an auxiliary contact spring are arranged on the top. And a raised hook is arranged at the bottom.

[0013] Preferably, the arc extinguishing system includes an auxiliary contact arc extinguishing system and a main contact arc extinguishing system. The auxiliary contact arc extinguishing system is arranged at the upper end. The main contact arc extinguishing system is arranged at the root of each phase of the main contact. The main contact arc extinguishing system includes a cavity and an arc extinguishing member. The arc extinguishing member includes an arc guiding boss and an "L"-type arc guiding angle. And a "T"-type structure is arranged at the upper end of the arc extinguishing member. And the "T"-type structure is hung on the first housing and the second housing.

[0014] Preferably, the contact protection device includes a transparent cover inspection window, a top protective cover, an auxiliary protective cover, a main protective cover, and a dust cover. An expansion module fixing cavity is arranged on the left side of the auxiliary protective cover, a hanging hook is arranged at the bottom, a module fixing window is arranged at the top, a grotto-shaped column styling, a quick plug-in flat gasket wiring type auxiliary protective cover, and a spring terminal clamping type auxiliary protective cover are arranged at the wiring position. A fixing window for the auxiliary protective cover and a fixing groove for the wiring terminal module are arranged at the top of the main protective cover. A fixing window for the main circuit wiring terminal module and a fixing window for the wiring terminal module are respectively arranged on both end faces. Adjustment windows for the expansion module, a "crescent" fading surface, a "water" character styling, a side-mounted expansion module connection window, and an enterprise logo are arranged on both side faces. A main protective cover and a second clamping hook are arranged at the bottom.

[0015] Preferably, the independent wiring terminal module includes a wiring base, a wiring frame, a bottom plate, a protective cover, and an expansion function wiring base. An expansion module fixing structure, an expansion module hanging groove, and a sunken hole fading surface are arranged at the top of the wiring base. A first expansion module fixing groove and a first grotto-shaped column appearance type are arranged on the end face. A second expansion module hanging interface is arranged at the bottom. A clamping convex package and a lower clamping convex package are arranged on the back of the wiring base.

[0016] Preferably, the expansion function wiring base and the protective cover are matched. A fixing hook, a second grotto-shaped column appearance type, a second expansion module fixing groove, and a fixing boss are arranged on the expansion function wiring base. A module fixing structure, a third grotto-shaped column appearance type, a fixing convex package, an expansion module fixing groove, and an elastic fixing block are arranged on the protective cover.

[0017] The present invention discloses a multi-functional AC contactor, and its beneficial effects are as follows:

[0018] 1. This new type of 95A multi-functional AC contactor has the advantages of small volume, modular design, multiple installation methods, high protection level, high electrical safety performance, strong scalability, diverse wiring types, and novel overall appearance styling. It can remotely connect and disconnect circuits with an AC-3 service category and a rated working current of up to 95A at a rated working voltage of 380V. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present invention;

[0020] Figure 2 It is a sectional view of the AC contactor of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the contact system of the AC contactor of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the contact system of the AC contactor of the present invention;

[0023] Figure 5Schematic structural diagram of the connection bracket system of the AC contactor of the present invention;

[0024] Figure 6 Schematic structural diagram of the arc extinguishing system of the AC contactor of the present invention;

[0025] Figure 7 Schematic structural diagram of the arc extinguishing part of the present invention;

[0026] Figure 8 Schematic structural diagram of the electromagnetic system of the AC contactor of the present invention;

[0027] Figure 9 Schematic structural diagram of the mounting base of the AC contactor of the present invention;

[0028] Figure 10 Schematic structural diagram of the auxiliary protective cover of the AC contactor of the present invention;

[0029] Figure 11 Schematic structural diagram of the main protective cover of the AC contactor of the present invention;

[0030] Figure 12 Schematic structural diagram of the wiring terminal of the AC contactor of the present invention;

[0031] Figure 13 Schematic structural diagram of the wiring base of the AC contactor of the present invention;

[0032] Figure 14 Schematic structural diagram of the wiring base of the AC contactor of the present invention;

[0033] Figure 15 Schematic structural diagram of the extended function wiring base and protective cover of the AC contactor of the present invention.

[0034] In the figure: 1. AC contactor; 2. Contact system; 201. Normally closed auxiliary contact fixing window; 202. Normally open auxiliary contact fixing window; 203. Static normally open auxiliary contact; 204. First expansion module fixing window; 205. Expansion module fixing convex hull; 206. Clamping groove; 207. Static main contact; 208. Second expansion module fixing window; 209. Expansion module clamping groove; 210. Contact protection system fixing window; 211. First housing; 212. Static normally closed auxiliary contact; 213. Expansion module hanging groove; 214. Second housing; 215. First clamping hook; 216. Arc extinguishing device fixing window; 3. Connection bracket system; 301. Moving closing auxiliary bridge contact; 302. Auxiliary contact bracket; 303. Main contact bracket; 304. Moving closing main bridge contact; 305. Expansion module connection window; 306. Main contact spring; 307. Auxiliary contact spring; 308. First expansion module hanging interface; 309. Protruding hook; 310. Grooved guide rail; 4. Arc extinguishing system; 401. Auxiliary contact arc extinguishing system; 402. Main contact arc extinguishing system; 403. Arc extinguishing part; 404. Arc leading convex hull; 405. "L"-shaped arc leading angle; 406. "T"-shaped structure; 5. Electromagnetic system; 501. Sheet spring; 502. "E"-type self-locking and overlapping riveted silicon steel sheet moving iron; 503. Coil; 504. "E"-type self-locking and overlapping riveted silicon steel sheet static iron; 505. Reaction spring; 6. Installation base; 601. Base; 602. Screw installation hole; 603. TH75mm standard card rail; 604. Dovetail groove; 605. Appearance cavity shape; 606. Installation hole; 607. Block spring; 608. Installation block; 609. TH35mm standard card rail; 610. Derived product fixing hole; 611. Component screw; 7. Contact protection device; 701. Top protective cover; 702. Transparent cover inspection window; 703. Auxiliary protective cover; 704. Main protective cover; 705. Dust cover; 706. Quick plug-in type spring flat washer wiring type auxiliary protective cover; 707. Spring terminal clamping type auxiliary protective cover; 7031. Cavity column shape; 7032. Hanging hook; 7033. Expansion module fixing cavity; 7034. Module fixing window; 7040. Second clamping hook; 7041. Wiring terminal module fixing groove; 7042. Main circuit wiring terminal module fixing window; 7043. Wiring terminal module fixing window; 7044. Auxiliary protective cover fixing window; 7045. Expansion module adjustment window; 7046. "Water" character shape; 7047. Side-mounted expansion module connection window; 7048. "Crescent" fading surface; 7049. Enterprise logo; 8. Independent wiring terminal module; 801. Wiring base; 802. Wiring frame; 803. Base plate; 804. Protective cover; 805. Expansion function wiring base; 8010. Expansion module fixing structure; 8011. Counterbore fading surface; 8012. Expansion module hanging groove; 8013. First cavity column appearance type; 8014. First expansion module fixing groove;8015. Second expansion module hanging interface; 8016. Card-mounted convex hull; 8017. Lower card-mounted convex hull; 8040. Expansion module fixing groove; 8041. Appearance of the third grotto-style pillar; 8042. Fixing convex hull; 8043. Module fixing structure; 8044. Elastic fixing block; 8050. Fixing hook; 8051. Appearance of the second grotto-style pillar; 8052. Second expansion module fixing slot; 8053. Fixing boss. Detailed implementation

[0035] An embodiment of the present invention discloses a multifunctional AC contactor, as Figures 1-15 shown, which includes an AC contactor 1. The AC contactor 1 includes a contact system 2, a connection bracket system 3, an arc extinguishing system 4, an electromagnetic system 5, a mounting base 6, a contact protection device 7, and an independent wiring terminal module 8;

[0036] The contact system 2, the electromagnetic system 5, and the contact protection device 7 are arranged on the top of the mounting base 6. The arc extinguishing system 4 is fixedly connected to the contact system 2. The connection bracket system 3 is arranged on the top of the contact system 2. And the contact system 2, the connection bracket system 3, the arc extinguishing system 4, and the electromagnetic system 5 are all arranged inside the contact protection device 7. The number of the independent wiring terminal modules 8 is two, and they are arranged on both sides of the contact protection device 7, and can remotely control the on and off of a circuit with a rated working current of up to 95A at an AC-3 service category and a rated working voltage of 380V; This kind of AC contactor 1 has a modular design and a small volume; it has a variety of installation methods; it has a high protection level, reliable electrical safety performance; it has strong expandability; it has a variety of wiring types.

[0037] The mounting base 6 includes a base 601. The upper surface of the base 601 is provided with mounting blocks 608 and block springs 607. And the upper surface of the base 601 is provided with a TH35mm standard card rail 609, a TH75mm standard card rail 603, screw mounting holes 602 and mounting holes 606, derivative product fixing holes 610, dovetail grooves 604, and appearance grotto types 605. Composition screws 611 are arranged in the mounting holes 606. The mounting base 6 is designed with a TH35mm standard card rail 609, a TH75mm standard card rail 603, and screw mounting holes 602, which is convenient for users to have more choices for suitable installation methods.

[0038] The contact system 2 includes a first housing 211 and a second housing 214. The first housing 211 and the second housing 214 are fixedly connected through a forming screw 611 and a mounting hole 606. A static main contact 207 is fixedly connected between the first housing 211 and the second housing 214. On the upper outer surfaces of the first housing 211 and the second housing 214, there are respectively provided a first expansion module fixing window 204, an expansion module fixing convex hull 205, a normally closed auxiliary contact fixing window 201, a normally open auxiliary contact fixing window 202, an expansion module hanging slot 213, and an arc extinguishing device fixing window 216. On the lower outer surfaces of the first housing 211 and the second housing 214, there are respectively provided a clamping groove 206, a first clamping hook 215, a second expansion module fixing window 208, a contact protection system fixing window 210, and an expansion module clamping slot 209. And three groups of static main contacts 207 are respectively inlaid on the lower layers of the first housing 211 and the second housing 214, and a group of static normally open auxiliary contacts 203 and a group of static normally closed auxiliary contacts 212 are respectively inlaid on the upper layers. And the normally closed auxiliary contact fixing window 201 and the normally open auxiliary contact fixing window 202 are respectively fixedly connected with the static normally open auxiliary contact 203 and the static normally closed auxiliary contact 212.

[0039] The electromagnetic system 5 includes a direct-acting "E"-type self-locking laminated silicon steel sheet moving iron 502, a coil 503, a return spring 505, and an "E"-type self-locking laminated silicon steel sheet static iron 504. The "E"-type self-locking laminated silicon steel sheet static iron 504 is clamped on the upper surface of the inner cavity of the base 601. The direct-acting "E"-type self-locking laminated silicon steel sheet moving iron 502, the coil 503, and the return spring 505 are arranged on the top of the "E"-type self-locking laminated silicon steel sheet static iron 504. The direct-acting "E"-type self-locking laminated silicon steel sheet moving iron 502 is fixedly connected to the bottom of the leaf spring 501. The electromagnetic system 5 leads the control circuit terminal of the coil 503 to the upper layer of the main circuit through a terminal, and is arranged on the same layer as the auxiliary circuit, which is convenient for users to wire and also reduces the volume of the AC contactor 1.

[0040] The connection support system 3 includes a main contact support 303. The main contact support 303 is fixedly connected to the top of the leaf spring 501. A main contact spring 306 is fixedly connected inside the main contact support 303. And the bottom of the main contact spring 306 is fixedly connected with a normally open main bridge-shaped contact 304. Expansion module connection windows 305 are arranged on both sides of the main contact support 303, and a normally open auxiliary bridge-shaped contact 301, a mounting groove-shaped guide rail 310, an auxiliary contact support 302, a first expansion module hanging interface 308, and an auxiliary contact spring 307 are arranged on the top. And a raised hook 309 is arranged at the bottom.

[0041] The arc extinguishing system 4 has an auxiliary contact arc extinguishing system 401 and a main contact arc extinguishing system 402. The auxiliary contact arc extinguishing system 401 is arranged at the upper end, and the main contact arc extinguishing system 402 is arranged at the root of each phase of the main contact. The main contact arc extinguishing system 402 includes a cavity and an arc extinguishing member 403. The arc extinguishing member 403 includes an arc leading convex hull 404 and an "L"-shaped arc leading angle 405. And the upper end of the arc extinguishing member 403 is provided with a "T"-shaped structure 406, and the "T"-shaped structure 406 is hung on the first housing 211 and the second housing 214. In the arc extinguishing system 4, the arc extinguishing member 403 is designed with an "L"-shaped arc leading angle 405, and the moving contact main bridge-shaped contact 304 in the movable connection bracket system 3 is designed with a "boat-shaped" arc leading angle structure. When the two are assembled and act on the AC contactor 1, the arc generated when the contact is connected and disconnected is effectively led to an independent arc extinguishing chamber, so that the contact of the AC contactor 1 is quickly extinguished, realizing the control of a 95A high-current circuit.

[0042] The contact protection device 7 includes a transparent cover inspection window 702, a top protection cover 701, an auxiliary protection cover 703, a main protection cover 704 and a dust protection cover 705. On the left side of the auxiliary protection cover 703, there is an extended module fixing cavity 7033, at the bottom there is a hanging hook 7032, at the top there is a module fixing window 7034, at the wiring position there are a cave-shaped column shape 7031, a quick plug-in type spring flat washer wiring type auxiliary protection cover 706 and a spring terminal clamping type auxiliary protection cover 707. On the top of the main protection cover 704, there are an auxiliary protection cover fixing window 7044 and a wiring terminal module fixing groove 7041. On both end faces, there are respectively a main circuit wiring terminal module fixing window 7042 and a wiring terminal module fixing window 7043. On both side faces, there are extended module adjustment windows 7045, a "crescent" gradually disappearing surface 7048, a "water" character shape 7046, a side-mounted extended module connection window 7047 and an enterprise logo 7049. At the bottom, there are a main protection cover 704 and a second clamping hook 7040. By designing insulating ribs on the inner sides of the auxiliary protection cover 703 and the main protection cover 704, the electrical clearance and creepage distance between the contacts of each phase of the contact system 2 are increased, thereby reducing the volume of the AC contactor 1, realizing the modular design of the AC contactor 1, and effectively improving the utilization rate of the box space.

[0043] The independent wiring terminal module 8 includes a wiring base 801, a wiring frame 802, a bottom plate 803, a protection cover 804 and an extended function wiring base 805. On the top of the wiring base 801, there are an extended module fixing structure 8010, an extended module hanging groove 8012 and a counterbore gradually disappearing surface 8011. On the end face, there are a first extended module fixing groove 8014 and a first cave-shaped column appearance type 8013. At the bottom, there is a second extended module hanging interface 8015. On the back of the wiring base 801, there are a clamping convex hull 8016 and a lower clamping convex hull 8017, so that different extended modules can be added to realize the multi-functional modular design of the AC contactor 1.

[0044] The extended function terminal block 805 matches the protective cover 804. The extended function terminal block 805 is provided with a fixed hook 8050, a second grotto-column appearance type 8051, a second extended module fixing groove 8052 and a fixed boss 8053. The protective cover 804 is provided with a module fixing structure 8043, a third grotto-column appearance type 8041, a fixed convex hull 8042, an extended module fixing groove 8040 and an elastic fixing block 8044. The top protective cover 701, the auxiliary protective cover 703, the main protective cover 704, the dust cover 705 and the independent terminal block module 8 are installed. The independent clamping of various protective covers 804 not only simplifies the assembly process of the AC contactor 1 but also effectively improves the protection level of the AC contactor 1. The independent terminal block module 8 is clamped at the tail of the shell contact. It is convenient for the combined installation of electrical appliances and increases the creepage distance between phases through the extended module fixing card slot and the grotto-column appearance shape on the independent terminal block module 8, effectively improving the electrical safety performance of the AC contactor 1. Through the design of the top module fixing window 7034 and the left module fixing cavity structure on the auxiliary protective cover 703, the expandable function at the top of the AC contactor 1 is realized.

[0045] Working principle: When the coil 503 is energized, a magnetic field is generated around the iron core. Under the action of magnetic force, the "E"-type self-locking laminated silicon steel sheet moving iron 502 overcomes the reaction force of the reaction spring 505, the main contact spring 306 and the auxiliary contact spring 307, and drives the connection bracket system 3 to move downward. When the connection bracket system 3 moves downward for a certain stroke, the moving main bridge-shaped contact 304 makes reliable contact with the static main contact 207, the moving auxiliary bridge-shaped contact 301 makes reliable contact with the static normally open auxiliary contact 203, and the moving auxiliary bridge-shaped contact 301 is completely disconnected from the static normally closed auxiliary contact 212. The AC contactor 1 is completely attracted. When the coil 503 is de-energized, under the reaction force of the reaction spring 505, the main contact spring 306 and the auxiliary contact spring 307, the connection bracket system 3 is driven to move upward. The moving main bridge-shaped contact 304 is completely disconnected from the static main contact 207, the moving auxiliary bridge-shaped contact 301 is completely disconnected from the static normally open auxiliary contact 203, and the moving auxiliary bridge-shaped contact 301 makes reliable contact with the static normally closed auxiliary contact 212. The AC contactor 1 is completely disconnected.

[0046] In the contact system 2, the shell is designed with a two-half structure, the main circuit and the auxiliary circuit are designed in layers. Each phase contact and the contact inlet side and the outlet side are respectively designed with independent arc extinguishing chambers. And there are insulating ribs and arc separating plates designed between the auxiliary protective cover 703, the main protective cover 704 and the contact system 2, so that each phase of the AC contactor 1 forms an independent and sealed arc extinguishing chamber. Thus, the arc generated during the connection and disconnection process of the AC contactor 1 is under a certain pressure, making it quickly extinguish the arc, realizing zero arcing during the operation of the AC contactor 1.

[0047] The top of the main protective cover 704 is designed with an expansion module fixing structure 8010, which can be firmly hooked to a variety of wired auxiliary protective covers 703, realizing various wiring type structures for the auxiliary circuit of the AC contactor 1 and the control circuit of the coil 503, and meeting the wiring requirements of diversified users. At present, the auxiliary circuit of the AC contactor 1 has four wiring types: washer screw wiring type, spring terminal card-mounted wiring type, quick plug-in type, and spring flat washer bolt wiring type;

[0048] Through the design of the module fixing structures 8043 on both sides of the main protective cover 704, different independent wiring terminal modules 8 can be fixed, realizing different wiring types for the main circuit of the AC contactor 1. At present, the wiring types of the main circuit of the AC contactor 1 are frame wiring type and spring flat washer bolt wiring type;

[0049] The top of the independent wiring terminal module 8 is designed with a module fixing structure 8043, and the side is designed with a module fixing card slot. The side of the installation base 6 is designed with a dovetail groove 604 and a pit structure. These structures can all be equipped with different expansion modules to realize the multi-functional modular design of the AC contactor 1.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional AC contactor, comprising an AC contactor (1), characterized in that: The AC contactor (1) includes a contact system (2), a connection bracket system (3), an arc extinguishing system (4), an electromagnetic system (5), a mounting base (6), a contact protection device (7), and an independent terminal block module (8); The contact system (2), the electromagnetic system (5), and the contact protection device (7) are arranged on the top of the mounting base (6). The arc extinguishing system (4) is fixedly connected to the contact system (2). The connection bracket system (3) is arranged on the top of the contact system (2). The contact system (2), the connection bracket system (3), the arc extinguishing system (4), and the electromagnetic system (5) are all arranged inside the contact protection device (7). The number of the independent terminal block modules (8) is two, and they are arranged on both sides of the contact protection device (7); The mounting base (6) includes a base (601). The upper surface of the base (601) is provided with mounting blocks (608) and block springs (607). The upper surface of the base (601) is provided with a TH35mm standard card rail (609), a TH75mm standard card rail (603), screw mounting holes (602), mounting holes (606), derivative product fixing holes (610), dovetail grooves (604), and appearance cavities (605). A component screw (611) is arranged in the mounting hole (606); The contact system (2) includes a first housing (211) and a second housing (214). The first housing (211) and the second housing (214) are fixedly connected to the mounting hole (606) through the component screw (611). A static main contact (207) is fixedly connected between the first housing (211) and the second housing (214). First extended module fixing windows (204), extended module fixing convex hulls (205), normally closed auxiliary contact fixing windows (201), normally open auxiliary contact fixing windows (202), extended module hanging grooves (213), and arc extinguishing device fixing windows (216) are respectively arranged on the outer surfaces of the upper layers of the first housing (211) and the second housing (214). Mounting grooves (206), first mounting hooks (215), second extended module fixing windows (208), contact protection system fixing windows (210), and extended module mounting grooves (209) are respectively arranged on the outer surfaces of the lower layers of the first housing (211) and the second housing (214). Three groups of static main contacts (207) are respectively inlaid on the lower layers of the first housing (211) and the second housing (214). One group of static normally open auxiliary contacts (203) and one group of static normally closed auxiliary contacts (212) are respectively inlaid on the upper layers. The normally closed auxiliary contact fixing window (201) and the normally open auxiliary contact fixing window (202) are respectively fixedly connected to the static normally open auxiliary contact (203) and the static normally closed auxiliary contact (212); The arc extinguishing system (4) includes an auxiliary contact arc extinguishing system (401) and a main contact arc extinguishing system (402). The auxiliary contact arc extinguishing system (401) is arranged at the upper end, and the main contact arc extinguishing system (402) is arranged at the root of each main contact. The main contact arc extinguishing system (402) includes a cavity and an arc extinguishing member (403). The arc extinguishing member (403) includes an arc initiating convex hull (404) and an "L"-shaped arc initiating angle (405). The upper end of the arc extinguishing member (403) is provided with a "T"-shaped structure (406), and the "T"-shaped structure (406) is hooked to the first housing (211) and the second housing (214). The contact protection device (7) includes a transparent cover inspection window (702), a top protection cover (701), an auxiliary protection cover (703), a main protection cover (704) and a dust protection cover (705). An extended module fixing cavity (7033) is arranged on the left side of the auxiliary protection cover (703), a hanging hook (7032) is arranged at the bottom, a module fixing window (7034) is arranged at the top, a cavity-shaped columnar shape (7031), a quick plug-in type spring washer wiring type auxiliary protection cover (706) and a spring terminal clamping type auxiliary protection cover (707) are arranged at the wiring position. An auxiliary protection cover fixing window (7044) and a wiring terminal module fixing groove (7041) are arranged at the top of the main protection cover (704), a main circuit wiring terminal module fixing window (7042) and a wiring terminal module fixing window (7043) are respectively arranged on both end faces, an extended module adjustment window (7045), a "crescent" gradually disappearing surface (7048), a "water" character shape (7046), a side-mounted extended module connection window (7047) and an enterprise logo (7049) are arranged on both side faces, and a main protection cover (704) and a second clamping hook (7040) are arranged at the bottom. The independent wiring terminal module (8) includes a wiring base (801), a wiring frame (802), a bottom plate (803), a protection cover (804) and an extended function wiring base (805). An extended module fixing structure (8010), an extended module hanging groove (8012) and a counterbore gradually disappearing surface (8011) are arranged at the top of the wiring base (801), a first extended module fixing groove (8014) and a first cavity-shaped columnar appearance type (8013) are arranged on the end face, a second extended module hanging interface (8015) is arranged at the bottom, and a clamping convex hull (8016) and a lower clamping convex hull (8017) are arranged on the back of the wiring base (801). The extended function wiring base (805) and the protection cover (804) are matched with each other. A fixing hook (8050), a second cavity-shaped columnar appearance type (8051), a second extended module fixing groove (8052) and a fixing boss (8053) are arranged on the extended function wiring base (805), and a module fixing structure (8043), a third cavity-shaped columnar appearance type (8041), a fixing convex hull (8042), an extended module fixing groove (8040) and an elastic fixing block (8044) are arranged on the protection cover (804).

2. The multifunctional AC contactor according to claim 1, wherein: The electromagnetic system (5) includes a direct-acting "E"-type self-latching and overlapping riveted silicon steel sheet moving iron (502), a coil (503), a reaction spring (505), and an "E"-type self-latching and overlapping riveted silicon steel sheet static iron (504). The "E"-type self-latching and overlapping riveted silicon steel sheet static iron (504) is clamped on the upper surface of the inner cavity of the base (601). The direct-acting "E"-type self-latching and overlapping riveted silicon steel sheet moving iron (502), the coil (503), and the reaction spring (505) are arranged on the top of the "E"-type self-latching and overlapping riveted silicon steel sheet static iron (504). The "E"-type self-latching and overlapping riveted silicon steel sheet moving iron (502) is fixedly connected to the bottom of the leaf spring (501).

3. A multifunctional AC contactor according to claim 1, characterized in that: The connection bracket system (3) includes a main contact bracket (303). The main contact bracket (303) is fixedly connected to the top of the leaf spring (501). A main contact spring (306) is fixedly connected inside the main contact bracket (303). The bottom of the main contact spring (306) is fixedly connected to a normally open main bridge-shaped contact (304). Expansion module connection windows (305) are arranged on both sides of the main contact bracket (303). A normally open auxiliary bridge-shaped contact (301), a mounting groove-type guide rail (310), an auxiliary contact bracket (302), a first expansion module hanging interface (308), and an auxiliary contact spring (307) are arranged on the top, and a raised hook (309) is arranged at the bottom.

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