CN212032974U - Low-voltage plastic shell breaker - Google Patents

Abstract

The utility model discloses a low-voltage molded case circuit breaker, which comprises a first circuit breaker mechanism, a second circuit breaker mechanism and a fixed base, wherein the first circuit breaker mechanism and the second circuit breaker mechanism are respectively arranged at the front side and the rear side of the fixed base; the left side and the right side of the fixed base are respectively symmetrically provided with two clamping grooves about a horizontal center line, I-shaped plates are embedded in the two clamping grooves, and the longitudinal cross sections of the I-shaped plates are I-shaped; clamping components are arranged at two ends of the I-shaped plate respectively and are matched with the clamping grooves; the I-shaped plate is embedded to two sides of the fixed base through the matching of the clamping component and the clamping groove. Overcome above-mentioned prior art not enough, the utility model discloses a cooperation of draw-in groove and joint subassembly makes circuit breaker convenient to detach, packing and transportation.

Description

Low-voltage plastic shell breaker

Technical Field

The utility model relates to a circuit breaker technical field, concretely relates to low-voltage molded case circuit breaker.

Background

The circuit breaker is used as an important control element in an electric power transmission and distribution system, and mainly plays roles in protecting an overload, an undervoltage and a short circuit of a distribution line and electric equipment. However, most of the existing low-voltage circuit breakers are of an input-output structure, single-sided operation is performed, so that a plurality of circuit breakers with the same type and the like can occupy larger space in the using process, the internal space of a power distribution cabinet is crowded, and the bus connection part is increased, so that the assembly cost is increased, and the miniaturization of the power distribution cabinet is not facilitated.

To solve the defects, China with the publication number of CN210142628U specially facilitates 3/13/2020, discloses a one-in two-out two-sided operation low-voltage molded case circuit breaker, which can realize that two circuit breakers of the same type, the same capacity and the same breaking capacity are combined into one, thereby reducing the installation space of the circuit breaker. However, according to the installation mode, the I-shaped through holes are formed in the two sides of the circuit breaker, the I-shaped plates are embedded in the I-shaped through holes, the I-shaped plates are installed inside the power distribution cabinet, and the two ends of the I-shaped plates protrude out of the shell of the circuit breaker; simultaneously, the I-shaped board both ends are outstanding outside the circuit breaker casing and have from the outside setting of extension part of casing also be convenient for transport not, damage because of the collision easily in the transportation, and because I-shaped board and the integrative installation of circuit breaker body, the damage of I-shaped board can influence the use of whole circuit breaker, causes use cost's increase.

In addition, there are some typical solutions in the prior art that facilitate the transportation of the circuit breaker. Chinese proprietary publication No. CN103311014A, 2013, 9, 18 discloses a telescopic disconnector arrangement for circuit breakers, comprising: the column casing and fix the base in column casing bottom, the column casing includes a plurality of horizontal poles that are interval distribution and the elasticity montant of connecting the horizontal pole, the column casing is telescopic setting through the elasticity montant, be the chucking setting between elasticity montant and the horizontal pole. This circuit breaker has reduced the packing cost of product because of can folding the shrink, also provides very big convenience for transportation and assembly simultaneously. Or as the Chinese special benefit of the publication No. CN206961763U, the breaker is disclosed in 2018, 2.2.a rectangular side face of the switch rotating shaft is provided with a fixing hole, so that the breaker can be conveniently and detachably connected with other electrical accessories of the breaker switch, and the transportation is convenient.

Therefore, how to improve the shell structure of the low-voltage molded case circuit breaker to facilitate the packaging and transportation still has many practical problems to be solved urgently.

Disclosure of Invention

For overcoming the not enough of above-mentioned prior art, the utility model provides a low pressure moulded case circuit breaker makes circuit breaker convenient to detach, packing and transportation through the cooperation of draw-in groove and joint subassembly.

The utility model discloses a realize through following technical scheme:

the low-voltage molded case circuit breaker comprises a first circuit breaker mechanism, a second circuit breaker mechanism and a fixed base, wherein the first circuit breaker mechanism and the second circuit breaker mechanism are respectively arranged on the front side and the rear side of the fixed base; the left side and the right side of the fixed base are respectively symmetrically provided with two clamping grooves about a horizontal center line, I-shaped plates are embedded in the two clamping grooves, and the longitudinal cross sections of the I-shaped plates are I-shaped; clamping components are arranged at two ends of the I-shaped plate respectively and are matched with the clamping grooves; the I-shaped plate is embedded to two sides of the fixed base through the matching of the clamping component and the clamping groove.

In the technical scheme, I-shaped plates are embedded in two clamping grooves formed in the left side and the right side of a fixed base, the I-shaped plates are embedded in the clamping grooves of the fixed base through clamping components arranged at the two ends, the position of a circuit breaker is limited, and the I-shaped plates are installed inside the circuit breaker, so that the circuit breaker is installed; through the cooperation of joint subassembly and draw-in groove, can enough realize spacing, installation and the dismantlement to the I-shaped board, can avoid I-shaped board both ends to stick out outside the casing of fixed baseplate and the switch board inner space that leads to is extravagant again, simultaneously, the casing of circuit breaker does not have outside outstanding part outward, can be convenient for the packing and the transportation of circuit breaker.

As a further technical scheme, the joint subassembly includes hollow cylinder, the one end that I word board was kept away from to hollow cylinder is equipped with a plurality of chucking spare. The hollow cylinder body can facilitate inward contraction of the clamping piece, so that when the clamping piece is clamped and fixed with the clamping groove on the fixing base, the clamping component penetrates through the clamping groove and abuts against the outer wall of the fixing base through the inward contraction of the clamping piece, and the clamping and fixing purposes are achieved; when needs are dismantled, with the end of a plurality of chucking spare with the instrument centre gripping and to middle shrink, realize dismantling the purpose that I-shaped board from fixed baseplate.

As a further technical scheme, the number of the clamping pieces is three, the three clamping pieces are arranged at even intervals, and the included angle between every two adjacent clamping pieces is 120 degrees. The clamping pieces can be set according to the situation, the specific number is not limited, and in consideration of clamping requirements, installation cost, process complexity and the like, an even number of clamping pieces, such as 2 or 4 clamping pieces, can be symmetrically arranged on the side face of the hollow column body.

As a further technical scheme, the clamping piece is of a wedge-shaped structure, the wedge-shaped structure penetrates out of the clamping grooves in two sides of the fixing base, and the thicker end of the wedge-shaped structure is abutted to the outer walls of the two sides of the fixing base. The upper end of chucking spare extends to the intermediate position of hollow cylinder, lie in chucking spare both sides on the hollow cylinder and seted up the notch along the axial to the interior space of keeping somewhere of drawing in of drawing in of chucking spare when the dismouting of being convenient for is inwards drawn in for a plurality of chucking spares.

As a further technical scheme, the clamping assembly and the I-shaped plate are integrally formed. The clamping component is made of non-metal materials, so that abrasion to the fixed base is reduced when the clamping component is fixed with the clamping groove.

As a further technical scheme, the clamping assembly is detachably connected with the I-shaped plate. The clamping assembly can be fixed at two ends of the I-shaped plate through fastening tools such as screws.

As a further technical scheme, threaded seats are respectively arranged on the left side and the right side of the fixed base and positioned at the peripheries of the two clamping grooves, the threaded seats are provided with cover bodies, and inner threads are arranged at one ends of the cover bodies, which are in contact with the threaded seats. The cover body is in threaded connection and fixed with the threaded seat so as to protect the clamping piece penetrating out of the clamping groove of the fixed base from collision or misoperation.

As a further technical scheme, the depth of the cover body is matched with the length of the clamping assembly protruding out of the two sides of the fixed base. The depth of the cover body is slightly larger than the length of the clamping piece, so that the clamping piece can be protected from collision or misoperation, the front end of the clamping piece is not directly contacted with the cover body, and mutual abrasion is reduced.

As a further technical scheme, the first circuit breaker mechanism comprises a first switch and a first shell, wherein the first switch is arranged in the middle of the first shell, the upper side of the first shell is connected with four first incoming line binding posts in a screwing manner, the lower side of the first shell is connected with four first outgoing line binding posts in a screwing manner, the top of the first shell is provided with four first incoming line holes, the positions of the four first incoming line holes are arranged corresponding to the positions of the four first incoming line binding posts, and first incoming lines penetrate through the first incoming line holes and are connected to the first incoming line binding posts; the second circuit breaker mechanism comprises a second switch and a second shell, the second switch is arranged in the middle of the second shell, the upper side of the second shell is connected with four second wire inlet binding posts in a screwing mode, the lower side of the second shell is connected with four second wire outlet binding posts in a screwing mode, four second wire inlet holes are formed in the top of the second shell, the positions of the four second wire inlet holes and the positions of the four second wire inlet binding posts are arranged correspondingly, and a second wire inlet penetrates through the second wire inlet holes and is connected to the second wire inlet binding posts; the inside of low-voltage moulded case circuit breaker is provided with female row of U type, female row of U type is used for passing through first inlet wire terminal with the second inlet wire terminal connection is to first inlet wire with the second inlet wire.

Four first wire outlet holes are formed in the bottom of the first shell, and a first wire outlet is connected to the first wire outlet binding post and penetrates out of the first wire outlet holes. And four second wire outlet holes are formed in the bottom of the second shell, and a second wire outlet is connected to the second wire outlet binding post and penetrates out of the second wire outlet holes. The bottom of first casing and second casing all is provided with alternate insulating slot, alternate insulating slot is used for pegging graft alternate insulating barrier, alternate insulating barrier separates each looks is qualified for the next round of competitions. The bottom of the fixed base is provided with a front insulation slot and a rear insulation slot, the front insulation slot and the rear insulation slot are used for being inserted with a front insulation baffle and a rear insulation baffle, and the front insulation baffle and the rear insulation baffle separate outgoing lines of the first shell and the second shell. The four corners of the first shell and the second shell are connected with the fixed base in a screwing mode through fixing screws. Carry out the grafting of inlet wire connecting wire through the entrance hole that the casing top was seted up, close first inlet wire terminal and second inlet wire terminal soon and carry out the fixed to the inlet wire, it connects to close soon respectively that first outlet wire terminal and second outlet wire terminal go out the line afterwards, accomplish the fixed of being qualified for the next round of competitions, carry out the grafting of insulating barrier in alternate insulating slot and front and back insulating slot, avoid later stage operation in-process electric arc to cause the circuit break, with this realization to two same kind models, shape same capacity, the same circuit breaker of breaking ability unites two into one, thereby the installation space of circuit breaker has been increased, resources are saved.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the utility model discloses to current one advance two formula low pressure moulded case circuit breaker structures, the joint between the draw-in groove of seting up through the joint subassembly that I-shaped plate both ends set up and the fixed baseplate left and right sides realizes that the joint of worker's word board on fixed baseplate is fixed, can not produce the slip of worker's word board, its simple structure, the easy switching of installation, the commonality is strong, can realize saving the amount of labour and improve production efficiency.

(2) The utility model discloses a chucking spare passes the draw-in groove of the fixed baseplate left and right sides and offsets with the outer wall of the fixed baseplate left and right sides, realizes that the I-shaped board is fixed in the fixed baseplate, need not adopt tools such as bolt to fix the I-shaped board, has also avoided too much outstanding in the left and right sides of fixed baseplate in I-shaped board both ends, leads to occuping great space, is unfavorable for the miniaturization of switch board.

(3) The utility model discloses a cooperation of lid and screw thread seat is protected the chucking spare that offsets fixedly with the fixed baseplate outer wall, and the transportation can not damage the mounting structure of worker's word board, is convenient for pack and transport.

Drawings

Fig. 1 is a schematic structural diagram of a low-voltage molded case circuit breaker according to an embodiment of the present invention;

fig. 2 is an installation schematic diagram of an i-shaped plate according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a clamping assembly according to an embodiment of the present invention;

fig. 4 is a schematic view of a retainer according to an embodiment of the present invention.

In the figure: 1. a fixed base; 101. a card slot; 2. a first housing; 201. a first incoming wiring terminal; 202. a first outlet binding post; 203. a first switch; 204. an insulating spacer; 3. a second housing; 301. a second wire inlet hole; 4. a retainer; 401. a clamping portion; 5. a clamping assembly; 6. i-shaped board.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

Referring to fig. 1 to 3, the present embodiment provides a low voltage molded case circuit breaker, including a first circuit breaker mechanism, a second circuit breaker mechanism and a fixed base 1, where the fixed base 1 is made of an insulating material, and the first circuit breaker mechanism and the second circuit breaker mechanism are respectively disposed on the front side and the rear side of the fixed base 1; the left side and the right side of the fixed base 1 are respectively symmetrically provided with two clamping grooves 101 about a horizontal center line, I-shaped plates 6 are embedded in the two clamping grooves 101, and the longitudinal cross sections of the I-shaped plates 6 are I-shaped; clamping components 5 are respectively arranged at two ends of the I-shaped plate 6, and the clamping components 5 are matched with the clamping grooves 101; the I-shaped plate 6 is embedded to two sides of the fixed base 1 through the matching of the clamping component 5 and the clamping groove 101. The utility model discloses a cooperation between the draw-in groove 101 that the joint subassembly 5 that the 6 both ends of worker's word board set up and the 1 left and right sides of fixed baseplate were seted up realizes that the joint of worker's word board 6 on fixed baseplate 1 is fixed, its simple structure, and easy installation is easily switched, and the commonality is strong, can realize saving the amount of labour and improve production efficiency.

The first circuit breaker mechanism comprises a first switch 203 and a first shell 2, the first switch 203 is arranged in the middle of the first shell 2, the upper side of the first shell 2 is connected with four first incoming line binding posts 201 in a screwing mode, the lower side of the first shell 2 is connected with four first outgoing line binding posts 202 in a screwing mode, four first incoming line holes are formed in the top of the first shell 2, the positions of the four first incoming line holes correspond to the positions of the four first incoming line binding posts 201, and first incoming lines penetrate through the first incoming line holes and are connected to the first incoming line binding posts 201; the second circuit breaker mechanism comprises a second switch and a second shell 3, the second switch is arranged in the middle of the second shell 3, the upper side of the second shell 3 is connected with four second wire inlet binding posts in a screwing mode, the lower side of the second shell 3 is connected with four second wire outlet binding posts in a screwing mode, four second wire inlet holes 301 are formed in the top of the second shell 3, the positions of the four second wire inlet holes 301 are arranged corresponding to the positions of the four second wire inlet binding posts, and second wire inlets penetrate through the second wire inlet holes 301 and are connected to the second wire inlet binding posts; the inside of low-voltage moulded case circuit breaker is provided with female row of U type, female row of U type is used for passing through first inlet wire terminal 201 with the second inlet wire terminal connection is to first inlet wire with the second inlet wire. The first incoming line wiring terminal 201 and the second incoming line wiring terminal are respectively glued on the fixed base 1.

Four first wire outlet holes are formed in the bottom of the first shell 2, and a first wire outlet is connected to the first wire outlet binding post 202 and penetrates out of the first wire outlet holes. Four second wire outlet holes are formed in the bottom of the second shell 3, and a second wire outlet is connected to the second wire outlet binding post and penetrates out of the second wire outlet holes. The bottom of first casing 2 and second casing 3 all is provided with alternate insulating slot, alternate insulating slot is used for pegging graft interphase insulating barrier 204, interphase insulating barrier 204 separates each alternate being qualified for the next round of competitions. The bottom of the fixed base 1 is provided with a front insulation slot and a rear insulation slot, the front insulation slot and the rear insulation slot are used for inserting a front insulation baffle plate 204 and a rear insulation baffle plate 204, and the front insulation baffle plate 204 and the rear insulation baffle plate 204 separate outgoing lines of the first shell 2 and the second shell 3. The four corners of the first shell 2 and the second shell 3 are connected with the fixed base 1 through fixing screws in a screwing mode. Carry out the grafting of inlet wire connecting wire through the entrance hole that the casing top was seted up, close first inlet wire terminal 201 and second inlet wire terminal soon and carry out the fixed to the inlet wire, it connects to close soon respectively to go out that first outlet wire terminal 202 and second outlet wire terminal go out, accomplish the fixed of being qualified for the next round of competitions, carry out the grafting of insulating barrier 204 in alternate insulating slot and front and back insulating slot, avoid later stage operation in-process electric arc to cause and open circuit, with this realization to two same type, shape same capacity, the circuit breaker of the same ability of breaking unites two into one, thereby the installation space of circuit breaker has been increased, and resources are saved.

I-shaped plates 6 are embedded in two clamping grooves 101 formed in the left side and the right side of a fixed base 1, the I-shaped plates 6 are embedded in the clamping grooves 101 of the fixed base 1 through clamping components 5 arranged at the two ends, the position of a circuit breaker is limited, and the I-shaped plates 6 are installed inside the circuit breaker, so that the circuit breaker is installed; through the cooperation of joint subassembly 5 and draw-in groove 101, can enough realize spacing, installation and dismantlement to I-shaped board 6, can avoid I-shaped board 6 both ends again to stick out outside the casing of fixed baseplate 1 and the switch board inner space that leads to is extravagant, simultaneously, the casing of circuit breaker does not have outside outstanding part outward, can be convenient for the packing and the transportation of circuit breaker.

The clamping component 5 comprises a hollow cylinder, and one end, far away from the I-shaped plate 6, of the hollow cylinder is provided with a plurality of clamping pieces 4. The hollow cylinder body is convenient for the inward contraction of the clamping piece 4, so that when the clamping piece 4 is clamped and fixed with the clamping groove 101 on the fixed base 1, the clamping component 5 penetrates through the clamping groove 101 and abuts against the outer wall of the fixed base 1 through the inward contraction of the clamping piece 4, and the clamping and fixing purposes are achieved; when the fixing base needs to be disassembled, the tail ends of the clamping pieces 4 are clamped by a tool and shrink towards the middle, so that the purpose of disassembling the I-shaped plate 6 from the fixing base 1 is achieved.

Clamping component 5 also can adopt solid cylinder, the one end that I-shaped board 6 was kept away from to solid cylinder is equipped with a plurality of chucking spare 4, is formed with the notch between two adjacent chucking spare 4, is formed with the cavity between a plurality of chucking spare 4. When the cavity is conveniently clamped and fixed with the clamping groove 101 on the fixed base 1, the clamping component 5 penetrates through the clamping groove 101 and abuts against the outer wall of the fixed base 1 through the middle contraction of the clamping piece 4, and the purpose of clamping and fixing is achieved; when the fixing base 1 needs to be disassembled, the tail ends of the clamping pieces 4 are clamped by a clamp or other tools and are contracted towards the middle, so that the purpose of disassembling the I-shaped plate 6 from the fixing base 1 is achieved.

Chucking spare 4 is equipped with threely chucking spare 4 evenly spaced sets up, and the contained angle between two adjacent chucking spare 4 is 120. The clamping pieces 4 can be set according to the situation, the specific number is not limited, and in consideration of clamping requirements, installation cost, process complexity and the like, an even number of clamping pieces 4, such as 2 or 4, can be symmetrically arranged on the side surface of the hollow column body.

The clamping piece 4 is of a wedge-shaped structure, the wedge-shaped structure penetrates out of the clamping grooves 101 in the two sides of the fixing base 1, and the thicker end of the wedge-shaped structure is abutted to the outer walls of the two sides of the fixing base 1. The upper end of chucking spare 4 extends to the intermediate position of hollow cylinder, it has seted up the notch to lie in 4 both sides of chucking spare along the axial on the hollow cylinder to 4 sides of chucking spare draw in when the dismouting of being convenient for draw in, draw in for a plurality of chucking spare 4 inwards and keep somewhere the space.

In order to facilitate the gripping of the gripping member 4, a gripping portion 401 may be provided at the end of the gripping member 4, said gripping portion 401 comprising a transverse projection, the direction of said transverse projection being perpendicular to the direction of the axis of the hollow cylinder.

In one embodiment, the clip assembly 5 is integrally formed with the i-shaped plate 6. Clamping component 5 is made of non-metallic materials, so that abrasion to fixed base 1 is reduced when the clamping component is fixed with clamping groove 101.

As an alternative embodiment, the clamping assembly 5 is detachably connected to the i-shaped plate 6. The clamping assembly 5 can be fixed at two ends of the I-shaped plate 6 through fastening tools such as screws.

The left side and the right side of the fixed base 1 are respectively provided with a threaded seat at the periphery of the two clamping grooves 101, the threaded seats are provided with a cover body, and an internal thread is arranged at one end of the cover body, which is in contact with the threaded seats. The cover body is in threaded connection and fixed with the threaded seat so as to protect the clamping piece 4 penetrating through the clamping groove 101 of the fixed base 1 from collision or misoperation.

The depth of the cover body is matched with the length of the clamping assembly 5 protruding out of the two sides of the fixed base 1. The degree of depth of lid is slightly greater than chucking spare 4 length for can protect chucking spare 4 and avoid colliding or maloperation, can make chucking spare 4 front end and lid direct contact not again, reduce wearing and tearing each other.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. The low-voltage molded case circuit breaker comprises a first circuit breaker mechanism, a second circuit breaker mechanism and a fixed base, wherein the first circuit breaker mechanism and the second circuit breaker mechanism are respectively arranged on the front side and the rear side of the fixed base; the fixing base is characterized in that the left side and the right side of the fixing base are respectively symmetrically provided with two clamping grooves about a horizontal center line, I-shaped plates are embedded in the two clamping grooves, and the longitudinal cross sections of the I-shaped plates are I-shaped; clamping components are arranged at two ends of the I-shaped plate respectively and are matched with the clamping grooves; the I-shaped plate is embedded to two sides of the fixed base through the matching of the clamping component and the clamping groove.

2. The low voltage molded case circuit breaker according to claim 1, wherein the clamping assembly comprises a hollow cylinder, and one end of the hollow cylinder, which is far away from the I-shaped plate, is provided with a plurality of clamping pieces.

3. The low-voltage molded case circuit breaker according to claim 2, wherein the clamping members are provided in three numbers, the three clamping members are arranged at regular intervals, and an included angle between two adjacent clamping members is 120 °.

4. The low-voltage molded case circuit breaker according to claim 2, wherein the clamping member is a wedge-shaped structure, the wedge-shaped structure penetrates through the clamping grooves on two sides of the fixed base, and the thicker end of the wedge-shaped structure abuts against the outer walls on two sides of the fixed base.

5. The low-voltage molded case circuit breaker according to claim 1, wherein the clamping assembly is integrally formed with an i-shaped plate.

6. The low-voltage molded case circuit breaker according to claim 1, wherein the clamping assembly is detachably connected to the i-shaped plate.

7. The low-voltage molded case circuit breaker according to claim 1, wherein the left and right sides of the fixed base are provided with screw thread seats at the peripheries of the two clamping grooves, the screw thread seats are provided with covers, and one ends of the covers contacting with the screw thread seats are provided with internal threads.

8. The circuit breaker as claimed in claim 7, wherein the cover has a depth matching a length of the clamping assembly protruding from both sides of the fixed base.

9. The low-voltage molded case circuit breaker according to claim 1, wherein the first circuit breaker mechanism comprises a first switch and a first housing, the first switch is arranged at a middle position of the first housing, four first incoming line terminals are screwed and connected to an upper side of the first housing, four first outgoing line terminals are screwed and connected to a lower side of the first housing, four first incoming line holes are formed in a top of the first housing, positions of the four first incoming line holes are arranged corresponding to positions of the four first incoming line terminals, and first incoming lines penetrate through the first incoming line holes and are connected to the first incoming line terminals; the second circuit breaker mechanism comprises a second switch and a second shell, the second switch is arranged in the middle of the second shell, the upper side of the second shell is connected with four second wire inlet binding posts in a screwing mode, the lower side of the second shell is connected with four second wire outlet binding posts in a screwing mode, four second wire inlet holes are formed in the top of the second shell, the positions of the four second wire inlet holes and the positions of the four second wire inlet binding posts are arranged correspondingly, and a second wire inlet penetrates through the second wire inlet holes and is connected to the second wire inlet binding posts; the inside of low-voltage moulded case circuit breaker is provided with female row of U type, female row of U type is used for passing through first inlet wire terminal with the second inlet wire terminal connection is to first inlet wire with the second inlet wire.

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