A circuit overload protector

Abstract

The application discloses a kind of circuit overload protectors, it is related to overload protection technical field, including shell and cover plate installed on shell, shell is equipped with installation cavity, installation cavity two sides are respectively equipped with the input end and output end of through shell, power supply part and electrical connection part, respectively with input end and shell rotation setting;Bimetallic strip, fixed end and output end electric connection, free end and electrical connection part electric connection;Driving member and driven member, are slidably arranged relative to installation cavity, driving member side wall is equipped with the connecting lug below the free end of bimetallic strip;Elastic member, between driving member and driven member installation;Limiting piece, elastically slidably set in installation cavity;Switching part, installation in installation cavity, when driven member displacement, power supply part, electrical connection part connection state are switched by switching part. Through bimetallic strip deformation drive elastic force storage makes driven member instantaneous displacement cut-off circuit, and keep circuit communication when bimetallic strip initial deformation, avoid electric appliance start misfire and arc generation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overload protection, in particular to a circuit overload protector. BACKGROUND

[0002] The overload protector is a circuit protection device designed according to the actual needs of the electrical control industry. The bimetallic strip is a common control element in the overload protector. When the overload current passes, the bimetallic strip generates heat due to Joule heat. The expansion amounts of the two metals are different, causing the strip body to bend and displace one of the wiring end points, so that the two wires are disconnected, thereby achieving circuit interruption. Since the bimetallic strip has a certain deformation process, during the deformation process, the two wiring end points may not be completely disconnected. When the two wiring end points are not completely disconnected, the current will try to cross the gap between the two end points, thereby generating an arc discharge phenomenon. Continuous arc discharge can rapidly age and carbonize the insulating material around the wiring end points, reduce the insulation performance, and increase the risk of electric leakage and short circuit. SUMMARY

[0003] The technical scheme of the present application provides a circuit overload protector.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a circuit overload protector, comprising a shell and a cover plate mounted on the shell, an installation cavity is formed in the shell, and an input end and an output end penetrating the shell are respectively mounted on both sides of the installation cavity, characterized in that:

[0005] A power supply part and an electrical connection part are respectively arranged in rotation with the input end and the shell;

[0006] A bimetallic strip is electrically connected between the fixed end and the output end, and the free end is electrically connected to the electrical connection part;

[0007] A driving member and a driven member are both arranged in sliding connection with the installation cavity, and a connecting lug is arranged on the side wall of the driving member below the free end of the bimetallic strip;

[0008] An elastic member is arranged between the driving member and the driven member;

[0009] A limiting member is arranged in elastic sliding connection in the installation cavity, and the limiting member is used to limit the displacement of the driven member along with the driving member;

[0010] A switching part is arranged in the installation cavity, and the switching part is used to switch the connection state of the power supply part and the electrical connection part when the driven member is displaced.

[0011] As a further scheme of the present application, the switching part comprises:

[0012] A support is arranged in the installation cavity, and the support has a Y-shaped structure;

[0013] The dial lever is rotatably arranged in the middle of the support, and both ends are provided with a sliding slot, and the follower is slidably arranged in the sliding slot of one end of the dial lever.

[0014] The driving rod is arranged in pairs and slidably arranged at the top of the support, and the bottom is slidably arranged in the sliding slot of the dial lever, and the top is slidably arranged in the driving power supply part and the free end of the power supply part, respectively.

[0015] The elastic sheet is arranged between the support and the dial lever.

[0016] As a further scheme of the present application, the mounting cavity is provided with a position-adjustable base, the driving part and the driven part are slidably arranged on the base, and the limiting part comprises:

[0017] The limiting block is slidably arranged in the base, and both upper and lower ends are provided with a chamfer;

[0018] The disengaging part is slidably arranged in the base and used for driving the limiting block to disengage from the driven part;

[0019] The pre-pressure regulator is installed in the base and used for driving the limiting block to reset;

[0020] The limiting rod is installed in the base and used for limiting the movement range of the limiting block.

[0021] As a further scheme of the present application, the pre-pressure regulator comprises:

[0022] The sliding plate is slidably arranged in the base;

[0023] The spring plate is installed between the sliding plate and the limiting block and used for driving the limiting block to reset;

[0024] The adjusting bolt is threadedly connected to the base on the side wall, and the inner end is rotatably arranged on the sliding plate.

[0025] As a further scheme of the present application, the mounting cavity is provided with a slot, the mounting seat is slidably connected in the slot, the reset key is elastically slidably arranged in the mounting seat through a spring, the movement track of the reset key partially overlaps the outer end of the disengaging part, and the outer end of the reset key is provided with a pressing cap; the inner side of the cover plate is fixedly provided with a positioning part for limiting the movement of the mounting seat.

[0026] As a further scheme of the present application, the power receiving part comprises a fixed part slidably arranged in the mounting cavity; the fixed part is rotatably provided with a movable part, and the movable part is provided with a power receiving head; the power supply part is provided with a power supply head; the power receiving head and the power supply head are respectively electrically connected with the bimetallic sheet and the input end.

[0027] As a further scheme of the present application, the bottom of the support is fixedly provided with a positioning seat, and both ends of the positioning seat respectively abut against the shell and the cover plate.

[0028] As a further scheme of the present application, the output end is fixed with a pair of connecting posts, the connecting posts and the bimetallic strip are in interference fit, and the fixed end of the bimetallic strip is inserted into the mounting cavity.

[0029] As a further scheme of the present application, the output end is in Z shape, grooves are formed on both sides of the input end, and protrusions are arranged on the shell and the cover plate.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. In the present application, after the bimetallic strip is bent and deformed, the connecting lug drives the driving member to slide relative to the shell. Since the driven member is limited by the limiting member and cannot move synchronously with the driving member, the elastic member between the two members starts to store energy. As the elastic member stores energy, the force exerted by the driven member on the limiting member through the driven member gradually increases. When this force is sufficient to overcome the limiting resistance of the limiting member to the driven member, the driven member is instantaneously displaced by a certain amount under the action of the elastic member. At the same time, the driven member instantaneously changes the connection state of the power supply part and the power receiving part by means of the switching part, so that the two parts are quickly separated and the circuit is instantaneously cut off.

[0032] 2. In the present application, in the initial stage of deformation of the bimetallic strip, the circuit remains in a connected state. This design has two important meanings: first, it can effectively prevent the large current generated at the moment of starting of the electrical appliance from causing slight deformation of the bimetallic strip, thereby preventing accidental triggering of the protector and ensuring normal starting and running of the electrical appliance; second, the connection state of the power supply part and the power receiving part is not affected by the initial deformation of the bimetallic strip, avoiding the generation of electric arc when the power supply part and the power receiving part are slightly separated in the initial stage of deformation of the bimetallic strip. The generation of electric arc can accelerate the aging of the equipment, reduce the insulation performance of the equipment, and increase the risk of leakage and short circuit. This design effectively avoids such problems and ensures the safe and stable operation of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0035] Figure 2 It is a schematic diagram of the overall explosion structure of the present application;

[0036] Figure 3 It is a schematic diagram of the internal structure of the shell of the present application;

[0037] Figure 4 It is the switching part and its connection relation structure schematic view of the present application;

[0038] Figure 5 It is the base and its connection relation structure schematic view of the present application;

[0039] Figure 6 It is the switching part structure schematic view of the present application;

[0040] Figure 7 It is the shifting lever and its connection relation structure schematic view of the present application;

[0041] Figure 8 It is the shell and its connection relation structure schematic view of the present application;

[0042] Figure 9 It is the input end structure schematic view of the present application; Figure 8 It is the enlarged structure schematic view of A in the present application;

[0043] Figure 10 It is the input end structure schematic view of the present application;

[0044] Figure 11 It is the cover plate and its connection relation structure schematic view of the present application;

[0045] In the drawings, the component list represented by each sign is as follows:

[0046] 1, shell; 11, cover plate; 12, mounting cavity; 2, input end; 21, recess; 22, protrusion; 23, power supply part; 24, power supply head; 3, output end; 31, wiring post; 32, electricity connection part; 33, fixed part; 34, movable part; 35, electricity connection head; 4, bimetallic strip; 5, base; 51, driving piece; 52, driven piece; 53, connecting lug; 54, elastic piece; 6, limiting piece; 61, limiting block; 62, chamfer; 63, limiting piece releasing part; 64, limiting rod; 7, pre-pressure regulator; 71, sliding plate; 72, spring plate; 73, adjusting bolt; 8, switching part; 81, support; 82, positioning seat; 83, shifting lever; 84, sliding groove; 85, driving rod; 86, elastic sheet; 91, mounting seat; 92, insertion slot; 93, reset key; 94, pressing cap; 95, positioning piece. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0048] Please refer to Figures 1-11The application provides a technical scheme: a circuit overload protector, which comprises a shell 1, a cover plate 11 installed on the shell 1, an installation cavity 12 formed in the shell 1, an input end 2 and an output end 3 penetrating the shell and installed on both sides of the installation cavity 12 respectively, and a power supply part 23 and an electricity connection part 32 rotatably arranged on the shell 1 and in contact with the input end 2 and the output end 3 respectively.

[0049] The power supply part 23 and the electricity connection part 32 are rotatably arranged on the shell 1 and in contact with the input end 2 and the output end 3 respectively.

[0050] A bimetallic strip 4 is electrically connected to the fixed end and the output end 3 and electrically connected to the electricity connection part 32.

[0051] A driving part 51 and a driven part 52 are slidably arranged relative to the installation cavity 12, and a connecting lug 53 is arranged on the side wall of the driving part 51 and located below the free end of the bimetallic strip 4; when the bimetallic strip 4 is bent, the driving part 51 is driven to slide relative to the shell 1 through the connecting lug 53.

[0052] An elastic part 54 is arranged between the driving part 51 and the driven part 52.

[0053] A limiting part 6 is elastically and slidably arranged in the installation cavity 12, and the limiting part 6 is used for limiting the displacement of the driven part 52 along with the driving part 51; when the driving part 51 slides relative to the shell 1, the limiting part 6 limits the movement of the driven part 52, so that the elastic part 54 is charged; when the elastic force of the elastic part 54 reaches a preset value, the limiting part 6 releases the limiting of the driven part 52, so that the driven part 52 is instantaneously displaced.

[0054] A switching part 8 is arranged in the installation cavity 12, and the switching part 8 is used for switching the connection state of the power supply part 23 and the electricity connection part 32 when the driven part 52 is displaced.

[0055] Normal working state: the protector is connected to the circuit in the following mode: through the input end 2 and the output end 3. At this time, the power supply part 23 and the electricity connection part 32 are in close contact and are in conduction, and the current flows in the order of input end 2→power supply part 23→electricity connection part 32→bimetallic strip 4→output end 3, thereby forming a complete path.

[0056] Overload response process:

[0057] When the circuit is overloaded, the bimetallic strip 4 will be bent and deformed. The specific process is as follows:

[0058] When the bimetallic strip 4 is deformed, it drives the driving part 51 to slide relative to the shell 1 through the connecting lug 53. Since the driven part 52 is limited by the limiting part 6, it cannot move synchronously with the driving part 51, which makes the elastic part 54 between the two begin to store energy. As the elastic part 54 stores energy, the force exerted by the driven part 52 on the limiting part 6 gradually increases. When this force is sufficient to overcome the limiting resistance of the limiting part 6 to the driven part 52, the driven part 52 is instantaneously displaced by a certain amount under the action of the elastic part 54. At the same time, the driven part 52 instantaneously changes the connection state of the power supply part 23 and the electrical connection part 32 through the switching part 8, so that they are quickly separated from each other, thereby instantaneously cutting off the circuit;

[0059] In the initial stage of deformation of the bimetallic strip 4, the circuit still maintains a connected state. This design has two important meanings: first, it can effectively prevent the large current generated at the moment of starting of the electrical appliance from causing slight deformation of the bimetallic strip 4, thereby preventing accidental triggering of the protector and ensuring normal starting and running of the electrical appliance; second, the connection state of the power supply part 23 and the electrical connection part 32 is not affected by the initial deformation of the bimetallic strip 4, avoiding the generation of electric arc when the power supply part 23 and the electrical connection part 32 are slightly separated in the initial stage of deformation of the bimetallic strip 4. The generation of electric arc can accelerate the aging of the equipment, reduce the insulation performance of the equipment, and increase the risk of leakage and short circuit. This design effectively avoids such problems and ensures the safe and stable operation of the circuit.

[0060] As a further scheme of the present application, the switching part 8 comprises:

[0061] The bracket 81 is installed in the installation cavity 12, and the bracket 81 has a Y-shaped structure;

[0062] The push rod 83 is rotationally arranged at the middle part of the bracket 81, and both ends of the push rod 83 are provided with sliding grooves 84. The driven part 52 is slidably arranged in the sliding groove 84 at one end of the push rod 83. When the driven part 52 moves, the push rod 83 can be rotated through the sliding groove 84;

[0063] The driving rods 85 are arranged in pairs and slidably arranged at the top of the bracket 81. The bottom of each driving rod 85 is slidably arranged in the sliding groove 84 at the end of the push rod 83, and the top of each driving rod 85 is slidably arranged in the driving power supply part 23 and the electrical connection part 32. When the push rod 83 rotates, the two driving rods 85 at both ends of the sliding groove 84 are moved in opposite directions through the sliding groove 84. The two driving rods 85 drive the power supply part 23 and the electrical connection part 32, respectively, so that they are close to or away from each other, thereby changing the connection state of the power supply part 23 and the electrical connection part 32;

[0064] The elastic sheet 86 is arranged between the bracket 81 and the push rod 83. When the push rod 83 rotates, the elastic sheet 86 is deformed to store energy, which serves as the power for resetting the push rod 83;

[0065] Specifically, when the driven part 52 moves, the driven part 52 drives one end of the lever 83 to move through the sliding groove 84, so that the lever 83 rotates, the lever 83 drives the two drive rods 85 at both ends to move reversely through the sliding groove 84, and the two drive rods 85 drive the power supply part 23 and the power receiving part 32 to move close to or away from each other, so as to realize the switching of the connection state of the power supply part 23 and the power receiving part 32, that is, the switching between separation and adhesion; the lever 83 drives the power supply part 23 and the power receiving part 32 to move reversely by driving the two drive rods 85 at the same time, compared with the movement of a single contact, this design can increase the speed of circuit disconnection and the distance of disconnection, and avoid the phenomenon of arc discharge caused by incomplete circuit disconnection;

[0066] As a further scheme of the present application, the base 5 with adjustable position is installed in the installation cavity 12, and the shell 1 and the cover plate 11 fix the position of the base 5 in a clamping manner, when it is necessary to adjust the position of the base 5, the base 5 is moved to adjust, the driving part 51 and the driven part 52 are slidably arranged on the base 5, the position of the base 5 is changed, the driven part 52 installed on the base 5 moves accordingly, the driven part 52 moves while the lever 83 is fixed in position, the initial position of the contact between the two changes accordingly, the angle of rotation of the lever 83 can be adjusted, so that the movement distance of the power supply part 23 and the power receiving part 32 is adjusted, so that the protector can be applied to circuits with different power;

[0067] The limiting part 6 comprises:

[0068] The limiting block 61 is slidably arranged in the base 5, and chamfers 62 are arranged at both upper and lower ends of the limiting block 61;

[0069] The disengaging part 63 is slidably arranged in the base 5, and is used to drive the limiting block 61 to disengage from the driven part 52;

[0070] The pre-pressure regulator 7 is installed in the base 5, and is used to drive the limiting block 61 to reset;

[0071] The limiting rod 64 is installed in the base 5, and is used to limit the movement range of the limiting block 61;

[0072] In combination Figure 5When the bimetallic strip 4 is bent, the driving piece 51 will be lowered. In this process, the driving piece 51 applies a downward pressure to the driven piece 52 through the elastic piece 54. However, the driven piece 52 is limited by the limiting block 61 and cannot move downward directly, which makes the elastic piece 54 deformed and start to accumulate force. As the deformation of the elastic piece 54 increases, the downward pressure applied by the elastic piece 54 to the driven piece 52 increases. When the downward pressure is enough to overcome the resistance of the limiting block 61 to the driven piece 52, the driven piece 52 will extrude the limiting block 61 by using the chamfer 62, so as to make the limiting block 61 and the driven piece 52 disengage. At this time, the driven piece 52 is rapidly lowered under the elastic force accumulated by the elastic piece 54. The lowered driven piece 52 drives the power supply part 23 and the contact part 32 to separate rapidly through the transmission of the lever 83 and the driving rod 85, so as to realize the instantaneous disconnection of the circuit, and effectively avoid the incomplete disengagement of the contacts.

[0073] When the bimetallic strip 4 is reset, the elastic piece 86 will drive the lever 83 to rotate reversely. The reverse rotation of the lever 83 will drive the driven piece 52 to move, but at this time the driven piece 52 is limited by the bottom of the limiting block 61 and cannot move upward. In this case, the unblocking piece 63 will play a role to drive the limiting block 61 to disengage from the driven piece 52. Subsequently, the driven piece 52 is reset under the elastic force of the elastic piece 86. The reset driven piece 52 will drive the driving piece 51 to also return to the initial position through the elastic piece 54, and complete the whole reset process.

[0074] As a further scheme of the present application, the pre-pressure regulator 7 comprises:

[0075] The sliding plate 71 is slidingly arranged in the base 5;

[0076] The spring plate 72 is arranged between the sliding plate 71 and the limiting block 61, and is used to drive the limiting block 61 to reset;

[0077] The adjusting bolt 73 is threadedly connected to the side wall of the base 5, and the inner end is rotatably arranged on the sliding plate 71;

[0078] Specifically, the adjusting bolt 73 is rotated, and the inner end of the adjusting bolt 73 moves relative to the base 5, so that the sliding plate 71 moves;

[0079] After the sliding plate 71 moves, the distance between the sliding plate 71 and the limiting block 61 changes. At this time, the spring plate 72 is deformed by virtue of its elastic property to compensate for the changed distance between the sliding plate 71 and the limiting block 61. The deformation of the spring plate 72 causes the internal stress of the spring plate 72 to change, so that the pre-pressure of the spring plate 72 changes;

[0080] After the spring plate 72 pre-pressure changes, the pushing force applied to the limiting block 61 will also change; the change of the pushing force will directly affect the force required for driving the limiting block 61 to displace, that is, the difficulty of driving the limiting block 61 to displace is changed;

[0081] In this way, the displacement sensitivity of the driven part 52 can be adjusted; since the displacement of the driven part 52 is closely related to the state of the limiting block 61, the change of the displacement difficulty of the limiting block 61 will indirectly affect the response speed of the driven part 52, and finally the purpose of adjusting the sensitivity of the protector is achieved, and the application range of the protector under different working environments and load conditions is effectively increased.

[0082] As a further scheme of the present application, a slot 92 is arranged in the mounting cavity 12, a mounting seat 91 is slidably connected in the slot 92, a reset key 93 is elastically and slidably arranged in the mounting seat 91, the moving track of the reset key 93 overlaps with the outer side end of the disengaging part 63, and a pressing cap 94 is arranged at the outer side end of the reset key 93; a positioning part 95 for limiting the movement of the mounting seat 91 is fixedly arranged on the inner side of the cover plate 11;

[0083] Specifically, by pressing the pressing cap 94, the reset key 93 is driven to move, and the reset key 93 approaches the disengaging part 63, and when the two contact, the disengaging part 63 moves and drives the limiting block 61 to disengage from the driven part 52, so that the reset of the driving part 51 and the driven part 52 is realized; the positioning part 95 can limit the movement of the mounting seat 91 when the cover plate 11 is installed, so as to avoid the movement of the mounting seat 91, which causes the reset key 93 to fail to drive the disengaging part 63 to move; after the cover plate 11 is removed, the limitation on the mounting seat 91 is removed, so that the mounting seat 91 and the parts connected therewith can be taken out of the mounting cavity 12, and targeted maintenance and replacement of parts are facilitated.

[0084] As a further scheme of the present application, the power connection part 32 comprises a fixed part 33 slidably arranged in the mounting cavity 12; the fixed part 33 is rotatably provided with a movable part 34, and the movable part 34 is provided with a power connection head 35; the power supply part 23 is provided with a power supply head 24; the power connection head 35 and the power supply head 24 are electrically connected with the bimetallic strip 4 and the input end 2 respectively;

[0085] As a further scheme of the present application, the bottom of the support 81 is fixedly provided with a positioning seat 82, and the two ends of the positioning seat 82 respectively abut against the shell 1 and the cover plate 11;

[0086] Specifically, the cover plate 11 can limit the support 81 by extruding the positioning seat 82 when the cover plate 11 is installed, and the limitation on the support 81 can be cancelled after the cover plate 11 is removed, so that the support 81 and the parts installed on the support 81 can be taken out of the mounting cavity 12, and targeted maintenance and replacement of parts are facilitated.

[0087] As a further scheme of the present application, the output end 3 is fixed with a pair of connecting posts 31, the connecting post 31 and the bimetallic strip 4 are in interference fit, avoiding the existence of gap between the two, causing the generation of arc, affecting the service life of the protector, and the fixed end of the bimetallic strip 4 is inserted into the installation cavity 12;

[0088] As a further scheme of the present application, the output end 3 is Z-shaped, recesses 21 are formed on both sides of the input end 2, and protrusions 22 are arranged on the shell 1 and the cover plate 11;

[0089] Specifically, the recesses 21 and the protrusions 22 can limit the input end 2, avoiding displacement of the input end 2 and affecting the use of the protector. The output end 3 is Z-shaped, which can prevent displacement of the output end 3 and affect the use of the protector.

Claims

1. A circuit overload protector, comprising a shell (1) and a cover plate (11) mounted on the shell (1), an installation cavity (12) is formed in the shell (1), an input end (2) and an output end (3) penetrating the shell are mounted on both sides of the installation cavity (12), characterized in that: a power supply part (23) and an electricity connection part (32) are rotatably arranged with the input end (2) and the shell (1) respectively; a bimetallic strip (4) is electrically connected with a fixed end and the output end (3), and electrically connected with a free end and the electricity connection part (32); a driving part (51) and a driven part (52) are both slidably arranged relative to the installation cavity (12), a connecting lug (53) is arranged on the side wall of the driving part (51) below the free end of the bimetallic strip (4); an elastic part (54) is mounted between the driving part (51) and the driven part (52); a limiting part (6) is elastically and slidably arranged in the installation cavity (12), and the limiting part (6) is used for limiting the displacement of the driven part (52) with the driving part (51); a switching part (8) is mounted in the installation cavity (12), and the connection state of the power supply part (23) and the electricity connection part (32) is switched through the switching part (8) when the driven part (52) is displaced; the switching part (8) comprises: a support (81) mounted in the installation cavity (12), the support (81) is a Y-shaped structure; a lever (83) is rotatably arranged at the middle part of the support (81), and both ends of the lever (83) are provided with sliding grooves (84), the driven part (52) is slidably arranged in the sliding groove (84) at one end of the lever (83) through a shaft; a driving rod (85) is arranged in pairs, slidably arranged at the top of both ends of the support (81), and slidably arranged at both ends of the lever (83) through the sliding grooves (84) at the bottom, and slidably arranged at the free ends of the power supply part (23) and the electricity connection part (32) through a shaft at the top; an elastic sheet (86) is arranged between the support (81) and the lever (83); an adjustable base (5) is mounted in the installation cavity (12), the driving part (51) and the driven part (52) are slidably arranged on the base (5), and the limiting part (6) comprises: a limiting block (61) slidably arranged in the base (5), and both upper and lower ends of the limiting block (61) are provided with chamfers (62); a disengaging part (63) slidably arranged in the base (5) is used for driving the limiting block (61) to disengage from the driven part (52); a pre-pressure regulator (7) mounted in the base (5) is used for driving the limiting block (61) to reset; a limiting rod (64) mounted in the base (5) is used for limiting the movement range of the limiting block (61). The pre-pressure regulator (7) comprises: a sliding plate (71) slidably arranged in the base (5); a spring plate (72) mounted between the sliding plate (71) and the limiting block (61) is used for driving the limiting block (61) to reset; and an adjusting bolt (73) with a threaded side wall connected to the base (5) is rotatably arranged on the inner side end of the sliding plate (71). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A circuit overloader according to claim 1, characterised in that: ​ ​ ​ ​ 3. A circuit overloader according to claim 1, wherein: The installation cavity (12) is provided with a slot (92), the slot (92) is slidably connected with a mounting seat (91), the mounting seat (91) is elastically slidably provided with a reset key (93) through a spring, the reset key (93) is partially overlapped with the outer side end of the disengaging part (63), and the outer side end of the reset key (93) is provided with a pressing cap (94); the inner side of the cover plate (11) is fixedly provided with a positioning part (95) for limiting the movement of the mounting seat (91).

4. A circuit overloader according to claim 1, wherein: The power connection part (32) comprises a fixed part (33) slidably arranged in the installation cavity (12); the fixed part (33) is rotatably provided with a movable part (34), and the movable part (34) is provided with a power connection head (35); the power supply part (23) is provided with a power supply head (24); the power connection head (35) and the power supply head (24) are respectively electrically connected with the bimetallic strip (4) and the input end (2).

5. A circuit overloader according to claim 1, wherein: The bracket (81) is fixedly provided with a positioning seat (82) at the bottom, and the two ends of the positioning seat (82) are respectively in contact with the shell (1) and the cover plate (11).

6. A circuit overloader according to claim 1, wherein: The output end (3) is fixedly provided with a pair of connecting posts (31), the connecting posts (31) and the bimetallic strip (4) are in interference fit, and the fixed end of the bimetallic strip (4) is inserted into the installation cavity (12).

7. A circuit overloader according to claim 1, wherein: The output end (3) is Z-shaped, the input end (2) is provided with a groove (21) on both sides, and the shell (1) and the cover plate (11) are provided with a protrusion (22).

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