Overload alarm non-tripping circuit breaker

Abstract

The utility model discloses an overload alarm non-tripping circuit breaker, which comprises a base, a rotating part, a bimetallic strip, a bimetallic pull rod and a microswitch, the bimetallic strip is in a flat plate shape, one end of the bimetallic strip is a movable end, and the first end of the bimetallic pull rod is fixed to the movable end. The microswitch is indirectly or directly fixed on the base; the rotating piece is rotationally arranged relative to the base and comprises a driving part and a jacking part which are arranged on the two sides of the rotating center of the rotating piece respectively; the driving part extends towards the direction of the bimetal pull rod, and the second end of the bimetal pull rod is hooked on the driving part; the top pressing part is used for being matched with the microswitch; when the circuit to be protected is not overloaded, the top pressing part and the microswitch are in a first state; when the to-be-protected circuit is overloaded, the bimetallic strip is bent in the direction away from the rotating piece, the rotating piece is pulled to rotate, and the jacking part microswitch is in a second state; the method has the advantage that the production process of the bimetallic strip is simplified.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a circuit breaker, specifically a circuit breaker with an overload alarm but no tripping. Background Art

[0002] Existing molded case circuit breakers generally include an overload protection function, that is, when an overload occurs in the line, the circuit breaker will automatically trip. However, in some special fields, such as the fire protection field, the circuit breaker is not allowed to trip even if the line is overloaded, but a signal must be output to allow maintenance personnel to know whether the line is overloaded.

[0003] The existing overload alarm non-tripping structure basically adopts the form of a micro switch, that is, after the bimetallic strip of the circuit breaker is bent due to overload, it triggers some transmission components to finally switch the state of the micro switch, thereby outputting an overload signal. However, in the existing overload alarm non-tripping structure, because the contact position of the bimetallic strip and the transmission structure is very far from the installation position of the bimetal, in order to meet the transmission requirements, the bimetallic strip is extended and bent. For example, the structure disclosed in CN100495620C has a bimetallic strip that is a V-shaped structure after bending. This bending process of the bimetallic strip is very unfavorable for processing.

[0004] Therefore, how to design an overload alarm non-tripping circuit breaker using a traditional flat bimetal strip is a problem worth studying. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a circuit breaker with an overload alarm that does not trip, which can simplify the production process of the bimetallic strip as much as possible.

[0006] The present application provides: a circuit breaker with overload alarm but no tripping, which comprises a base, a rotating member, a bimetallic strip, a bimetallic pull rod and a micro switch; the bimetallic strip is a flat plate, and one end of the bimetallic strip is a movable end; the micro switch is indirectly or directly fixed to the base; the rotating member is rotatably arranged relative to the base, the rotating member comprises a driving part and a pressing part, the driving part and the bimetallic strip are distributed on the left side of the rotation center, and the pressing part and the micro switch are distributed on the right side of the rotation center; the first end of the bimetallic pull rod is fixed on the movable end, and the second end is hooked on the driving part; the pressing part is used to cooperate with the micro switch; when the circuit to be protected is not overloaded, the pressing part and the micro switch are in a first state; when the circuit to be protected is overloaded, the bimetallic strip bends in a direction away from the rotating member, pulls the rotating member to rotate, and the micro switch of the pressing part is in a second state.

[0007] With the above structure, since the driving part and the pressing part are arranged on both sides of the rotating center of the rotating part, and the driving part extends toward the direction where the bimetallic pull rod is located, such a transmission structure design can make the bimetallic strip adopt the traditional flat structure, reducing the problem of overly complicated process caused by the bending process of the bimetallic strip in the prior art. With such a structure, the transmission structure is also relatively simple, which is convenient for production and assembly.

[0008] In some embodiments of the present application, the base includes at least two phase partitions, which are arranged at intervals; and also includes a rotating shaft, which is arranged on two adjacent phase partitions, and the rotating member is connected to the rotating shaft to form a rotational connection with the base.

[0009] With this structure, the rotating member is directly connected to the phase partition through the rotating shaft. This transmission structure is more streamlined, uses fewer parts, and is easy to produce and process.

[0010] In some embodiments of the present application, from the height direction of the circuit breaker, the driving part is higher than the rotation center of the rotating member, and the rotation center of the rotating member is higher than the pressing part.

[0011] Such a structure will not occupy too much space above the height of the circuit breaker, and can reduce the height of the circuit breaker as much as possible.

[0012] In some embodiments of the present application, the base includes at least two phase partitions, one of which is provided with a mounting groove and an avoidance groove at the notch of the mounting groove, the micro switch is arranged in the mounting groove, and the top pressure part is in the avoidance groove; regardless of whether it is the first state or the second state, the top pressure part is always in the avoidance groove.

[0013] The micro switch is set in the phase partition, which can effectively utilize the space of the phase partition, avoid occupying the space of other parts of the circuit breaker, and make the product more compact.

[0014] In some embodiments of the present application, the base includes at least two phase partitions; it also includes a fixed bracket, which is fixed above the at least two phase partitions; the rotating member is rotatably arranged on the fixed bracket to form a rotating arrangement relative to the base; from the height direction of the circuit breaker, the driving part and the top pressure part are both shorter than the rotation center of the rotating member; an installation groove is opened on the fixed bracket, and the micro switch is arranged in the installation groove.

[0015] With this structure, the fixed bracket is fixed on the phase partition, and the rotating member is rotatably connected to the fixed bracket. Although this structure has relatively more parts, it is relatively easy to install and is assembled above the base.

[0016] In some embodiments of the present application, the fixed bracket includes a mounting plate, which is fixed to at least two phase partitions by fixing screws; the fixed bracket is provided with at least two groups of pre-installation holes for the fixing screws to pass through, and the spacing between the pre-installation holes in each group of pre-installation holes is different.

[0017] This method of fastening is convenient for installation. At the same time, the design of multiple pre-installed hole groups with different spacings can be suitable for circuit breakers of different specifications. Because the phase partitions of circuit breakers of different specifications have different spacings, the pre-installed hole groups with different spacings can adapt to the phase partitions with different spacings, so that circuit breakers of multiple specifications can share a pair of mounting plates.

[0018] In some embodiments of the present application, the fixed bracket includes a mounting plate and two side panels arranged at intervals, a rotation groove is provided on the side panel, and the side panel is also provided with an opening groove that connects the rotation groove and the upper surface of the side panel, and the opening groove is a notch whose size gradually decreases from top to bottom; the rotating part has a columnar structure, and the columnar structure is inserted into the rotation groove through the open groove to form a rotation connection with the fixed bracket.

[0019] The design of the opening groove, the rotating groove and the columnar structure makes the installation of the rotating part very simple. It is only necessary to place the columnar structure on the opening groove and press the columnar structure.

[0020] In some embodiments of the present application, the fixed bracket also includes a fixing frame fixed on the fixed bracket, and the mounting groove is opened on the fixing frame; the fixing frame is located in the gap between the two side panels, and the fixing frame is connected to the two side panels through a first reinforcing rib; the first reinforcing rib is connected to the mounting plate through a second reinforcing rib.

[0021] This structural design is convenient for assembling the switch and can ensure the connection strength of the side panels and the fixing frame.

[0022] In some embodiments of the present application, a reset spring is also included; the first state is a state in which the pressing part squeezes the micro switch, and the second state is a state in which the pressing part is separated from the micro switch; the reset spring is connected to the rotating part to give the rotating part a biasing force, and the direction of the biasing force is the direction in which the pressing part squeezes the micro switch, and the biasing force is smaller than the force of the bimetal strip pulling the rotating part to rotate when the circuit to be protected is overloaded.

[0023] With this structure, the first state can be ensured to be stable through the design of the reset spring. At the same time, the biasing force is smaller than the force of the bimetal strip pulling the rotating part to rotate when the circuit to be protected is overloaded, which can ensure that when an overload occurs, the rotating part rotates and switches to the second state.

[0024] In some embodiments of the present application, the driving part is a fully enclosed annular structure or a semi-enclosed annular structure, and the double metal pull rod includes a rod and a head, the head is the second end of the double metal pull rod, and the size of the head is larger than the size of the rod; the head is hooked on the side wall of the fully enclosed annular structure or hooked on the side wall of the semi-enclosed annular structure.

[0025] The design of this structure will be beneficial to the coordination between the double metal pull rod and the driving part. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a circuit breaker according to an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram of the structure of the circuit breaker after the upper cover is removed according to the embodiment of the present application is shown;

[0029] Figure 3 An exploded view of a first implementation of a thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application is shown;

[0030] Figure 4 A structural schematic diagram showing a first implementation of a thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application;

[0031] Figure 5 It shows a structural schematic diagram of a first implementation mode of a thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application in a first state;

[0032] Figure 6 It shows a schematic structural diagram of a first implementation mode of a thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application in a second state;

[0033] Figure 7 A structural schematic diagram and a partial enlarged diagram of a second implementation of a thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application are shown;

[0034] Figure 8 It shows a structural schematic diagram of a second implementation mode of the thermal overload alarm non-tripping structure in the circuit breaker of the embodiment of the present application in a first state;

[0035] Fig. 9A structural schematic diagram of a second implementation of the thermal overload alarm non-tripping structure in a circuit breaker in an embodiment of the present application is shown in a second state. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0041] like Figure 1-Figure 9 As shown, an embodiment of the present application is a circuit breaker, which includes a housing, an operating mechanism, a contact system, an arc extinguishing system, and an overload alarm non-tripping function. The overload alarm non-tripping function here means that the circuit breaker will not trip even if the protected line is overloaded.

[0042] The alarm non-tripping function here is achieved in the following way:

[0043] The housing includes a base 100 and an upper cover 200, and the upper cover 200 is fixed on the base 100, and the fixing here is bolted. Of course, in addition to bolting, the fixing method here can also be selected from clamping, riveting and other methods.

[0044] The bimetal strip 300 is a flat plate structure. One end of the bimetal strip 300 is a fixed end 300b, which is connected to the thermal element 900 of the circuit breaker. The other end of the bimetal strip 300 is a movable end 300a, on which a bimetal rod 400 is arranged. When the protected line is overloaded, the thermal element 900 will heat up. Since the fixed end 300b is connected to the thermal element 900 of the circuit breaker, the bimetal strip 300 will bend when heated (the bending direction is away from the direction of the rotating member 600). The bimetal rod 400 here includes a head 400a and a rod 400b. The head 400a is connected to one end of the rod 400b. Therefore, the head 400a is the second end of the bimetal rod 400, and the end of the rod 400b where the head 400a is not arranged is the first end. The bimetal rod 400 here can be a screw, or a combination of a nut and a threaded cylindrical screw. This embodiment adopts a combination of a nut and a threaded cylindrical screw.

[0045] The micro switch 500 is fixed on the base 100 in an indirect or direct manner.

[0046] Rotating member 600, the rotating member 600 here is rotatably arranged relative to the base 100. The rotatably arranged relative to the base 100 here includes that the rotating member 600 directly has a rotational relationship with the base 100, and also includes that the rotating member 600 indirectly has a rotational relationship with the base 100. In either case, as long as the base 100 can be guaranteed to be stationary when the rotating member 600 rotates, the rotating member 600 includes a driving part 600a and a pressing part 600b, wherein the driving part 600a and the pressing part 600b are respectively arranged on the left and right sides of the rotation center of the rotating member 600, and the bimetallic strip 300 and the micro switch 500 are also respectively arranged on the left and right sides of the rotation center of the rotating member 600. Since the driving part 600a extends in the direction of the double-metal pull rod 400, and the second end of the double-metal pull rod 400 is hooked on the driving part 600a, when the line is overloaded, the double-metal pull rod 400 can pull the driving part 600a to rotate the rotating member 600. After the rotating member 600 rotates, the pressing part 600b also rotates. Here, the pressing part 600b and the micro switch 500 are used to cooperate with the micro switch 500. Therefore, when the line is not overloaded, the pressing part 600b and the micro switch 500 are in the first state, and when the line is overloaded, the pressing part 600b and the micro switch 500 are in the second state. Here, the first state is the state in which the pressing part 600b squeezes the micro switch 500, and the second state is the state in which the pressing part 600b leaves the micro switch 500. In this way, the state change of the micro switch 500 can be realized, so as to know whether there is an overload situation in the line to be protected.

[0047] In order to ensure that the pressing part 600b is relatively stable in the first state, a return spring 700 is further included. The return spring 700 here can be a tension spring, a compression spring, or a torsion spring. As long as the return spring 700 is connected to the rotating member 600, a biasing force is applied to the rotating member 600 so that the pressing part 600b presses the micro switch 500, and the biasing force is less than the pulling force of the bimetallic strip 300 when the line is overloaded, it will be sufficient.

[0048] The installation of the rotating member 600 and the micro switch 500 is introduced below through two specific implementations.

[0049] like Figure 7-9 As shown, the base 100 includes two phase partitions 101 . The phase partition 101 here is used to isolate two adjacent main circuits of the circuit breaker, and is therefore called a phase partition 101 .

[0050] A rotation hole is opened on the adjacent surfaces of the two phase partitions 101 , and both ends of the rotation shaft 103 are inserted into the rotation hole. The rotation shaft 103 can rotate relative to the base 100 through the rotation hole.

[0051] The rotating member 600 has a rotating portion 600 c , and the rotating portion 600 c is connected to the rotating shaft 103 , so that the rotating member 600 can directly rotate with the base 100 through the rotating shaft 103 .

[0052] In this embodiment, the driving part 600a is a semi-enclosed annular structure, which can also be understood as a U-shaped structure. The head 400a of the bimetal pull rod 400 is hooked on the side wall of the semi-enclosed annular structure, thereby pulling the rotating part 600 to rotate when the bimetal strip 300 bends.

[0053] In this embodiment, from the height direction of the circuit breaker, the driving portion 600a is higher than the rotation center of the rotating member 600, and the rotation center of the rotating member 600 is higher than the pressing portion 600b.

[0054] A mounting groove 101 a and an escape groove 101 b are formed on one of the phase partitions 101 . The escape groove 101 b is formed at the notch position of the mounting groove 101 a .

[0055] The micro switch 500 is disposed in the mounting groove 101 a , and a button of the micro switch 500 is located at a notch position of the mounting groove 101 a .

[0056] The pressing portion 600b is located in the avoiding groove 101b. No matter the pressing portion 600b is in the first state or the second state, the pressing portion 600b is always in the avoiding groove 101b.

[0057] The return spring 700 is a torsion spring, which abuts against the rotating member 600 to provide a biasing force.

[0058] like Figure 1-6 As shown, in this embodiment, the base 100 includes two phase partitions 101 . The phase partition 101 here is used to isolate two adjacent main circuits of the circuit breaker, and is therefore called a phase partition 101 .

[0059] The fixing bracket 800 is fastened to the two phase partitions 101 by using fixing screws.

[0060] The fixing bracket 800 here includes a mounting plate 801, two side plates 802, and a fixing frame 803. A pre-installation hole group 804 is opened on the mounting plate 801, and fixing screws can pass through the pre-installation hole group to fix the mounting plate 801 above the phase partition 101.

[0061] There are three pre-installation hole groups 804 here, and there are two pre-installation hole groups in each group. The spacing between the pre-installation hole groups in the three pre-installation hole groups 804 is different. Because the distances between the phase partitions 101 of circuit breakers of different specifications are different, pre-installation hole groups with different spacings can adapt to phase partitions 101 with different spacings.

[0062] The two side plates 802 are connected to the upper surface of the mounting plate 801, and are spaced apart from each other. A rotation groove 802a is provided on the side plate 802, and an opening groove 802b is formed between the rotation groove 802a and the upper surface of the side plate 802, wherein the opening groove 802b is a notch whose size gradually decreases from top to bottom.

[0063] The two ends of the rotating member 600 are columnar structures 600d. With the design of the opening groove 802b, the columnar structure 600d can be placed in the opening groove 802b, and the columnar structure 600d can be pressed downward to enter the rotating groove 802a to form a rotating connection.

[0064] Such a rotating member 600 is rotatably connected with the fixed bracket 800 , and the fixed bracket 800 is fastened to the base 100 , thereby achieving an indirect rotational relationship between the rotating member 600 and the base 100 .

[0065] In this embodiment, the driving portion 600 a and the pressing portion 600 b are both lower than the rotation center of the rotating member 600 .

[0066] The driving part 600a here is a fully enclosed annular structure, and the head 400a of the bimetal pull rod 400 is hooked on the side wall of the fully enclosed annular structure, so as to pull the rotating member 600 to rotate when the bimetal strip 300 is bent.

[0067] The fixing frame 803 is connected to the upper surface of the mounting plate 801, and the mounting groove 101a is opened on the fixing frame 803. The notch of the mounting groove 101a faces the top pressing portion 600b. The micro switch 500 is in the mounting groove 101a, and the button of the micro switch 500 is adjacent to the notch of the mounting groove 101a.

[0068] Here, the fixing frame 803 is located between the two side plates 802 , the fixing frame 803 and the two side plates 802 are connected via a first reinforcing rib 805 , and the first reinforcing rib 805 and the mounting plate 801 are connected via a second reinforcing rib 806 .

[0069] The return spring 700 is a tension spring, one end of which is connected to the fixed bracket 800 and the other end of which is connected to the rotating member 600 to provide a biasing force.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0071] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A circuit breaker with overload alarm but no tripping, characterized in that: It includes a base, a rotating part, a bimetallic strip, a bimetallic pull rod and a micro switch; the bimetallic strip is a flat plate, and one end of the bimetallic strip is a movable end; the micro switch is indirectly or directly fixed to the base; the rotating part is rotatably arranged relative to the base, and the rotating part includes a driving part and a pressing part, the driving part and the bimetallic strip are distributed on the left side of the rotation center of the rotating part, and the pressing part and the micro switch are distributed on the right side of the rotation center; the first end of the bimetallic pull rod is fixed on the movable end, and the second end of the bimetallic pull rod is hooked on the driving part; the pressing part is used to cooperate with the micro switch; when the circuit to be protected is not overloaded, the pressing part and the micro switch are in a first state; when the circuit to be protected is overloaded, the bimetallic strip bends in a direction away from the rotating part, pulling the rotating part to rotate, and the pressing part and the micro switch are in a second state.

2. A circuit breaker with overload alarm and no tripping according to claim 1, characterized in that: The base comprises at least two phase partitions, which are arranged at intervals; and also comprises a rotating shaft, which is arranged on two adjacent phase partitions, and the rotating member is connected to the rotating shaft to form a rotating connection with the base.

3. A circuit breaker with overload alarm and no tripping according to claim 2, characterized in that: From the height direction of the circuit breaker, the driving part is higher than the rotation center of the rotating member, and the rotation center of the rotating member is higher than the pressing part.

4. The circuit breaker with overload alarm and non-tripping according to claim 1, characterized in that: The base includes at least two phase partitions, one of which is provided with a mounting groove and an avoidance groove at the notch of the mounting groove, the micro switch is arranged in the mounting groove, and the top pressure part is in the avoidance groove; whether in the first state or the second state, the top pressure part is always in the avoidance groove.

5. The circuit breaker with overload alarm and non-tripping according to claim 1, characterized in that: The base includes at least two phase partitions; it also includes a fixed bracket, which is fixed above the at least two phase partitions; the rotating member is rotatably arranged on the fixed bracket to form a rotating arrangement relative to the base; from the height direction of the circuit breaker, the driving part and the top pressure part are both shorter than the rotation center of the rotating member; an installation groove is opened on the fixed bracket, and the micro switch is arranged in the installation groove.

6. A circuit breaker with overload alarm and no tripping according to claim 5, characterized in that: The fixing bracket comprises a mounting plate, which is fixed on at least two phase partitions by fixing screws; the fixing bracket is provided with at least two groups of pre-installation holes for the fixing screws to pass through, and the spacing between the pre-installation holes in each group of pre-installation holes is different.

7. The circuit breaker with overload alarm and non-tripping according to claim 5, characterized in that: The fixed bracket includes a mounting plate and two side plates arranged at intervals. A rotation groove is provided on the side plate. The side plate also has an opening groove that connects the rotation groove and the upper surface of the side plate. The opening groove is a notch whose size gradually decreases from top to bottom. The rotating part has a columnar structure, and the columnar structure is inserted into the rotation groove through the open groove to form a rotation connection with the fixed bracket.

8. The circuit breaker with overload alarm and non-tripping according to claim 7, characterized in that: The fixing bracket also includes a fixing frame fixed on the fixing bracket, and the mounting groove is opened on the fixing frame; the fixing frame is located in the interval between the two side plates, and the fixing frame is connected to the two side plates through a first reinforcing rib; the first reinforcing rib is connected to the mounting plate through a second reinforcing rib.

9. The circuit breaker with overload alarm and non-tripping according to claim 1, characterized in that: It also includes a reset spring; the first state is the state in which the pressing part squeezes the micro switch, and the second state is the state in which the pressing part is separated from the micro switch; the reset spring is connected to the rotating part to give the rotating part a biasing force, and the direction of the biasing force is the direction in which the pressing part squeezes the micro switch, and the biasing force is smaller than the force of the bimetallic strip pulling the rotating part to rotate when the circuit to be protected is overloaded.

10. The circuit breaker with overload alarm and non-tripping according to claim 1, characterized in that: The driving part is a fully enclosed annular structure or a semi-enclosed annular structure. The double metal pull rod includes a rod and a head. The head is the second end of the double metal pull rod. The size of the head is larger than the size of the rod. The head is hooked on the side wall of the fully enclosed annular structure or on the side wall of the semi-enclosed annular structure.

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