CN115775710A - Alarm contact and circuit breaker - Google Patents

Abstract

The application relates to the technical field of electrical devices, in particular to an alarm contact and a circuit breaking device. The alarm contact comprises a shell, and a contact support, a first fixed contact, a first moving contact, a second fixed contact and a second moving contact which are arranged in the shell. The contact support is linked with an operating mechanism of the circuit breaker and is used for jumping between the first position and the second position according to whether the operating mechanism is tripped or not. The first moving contact is electrically connected with the second wiring terminal and is used for being pushed by the contact support to be in contact with the first fixed contact when the contact support jumps to the first position, so that the first alarm loop is conducted. The second moving contact is electrically connected with the fourth wiring terminal and is used for being pushed by the support of the contact to be in contact with the second fixed contact when the support of the contact jumps to the second position, so that the first alarm loop is conducted. The alarm contact reduces the problems of poor reliability of on-off and low alarm accuracy of an alarm loop, and enlarges the application range of the alarm contact.

Description

Alarm contact and circuit breaker

Technical Field

The application relates to the technical field of electrical devices, in particular to an alarm contact and a circuit breaking device.

Background

The alarm contact is mainly used in cooperation with the circuit breaker to transmit a normal on-off signal of the circuit breaker or transmit a fault signal of the circuit breaker.

In the related art, there is an alarm contact, in which fixed contacts are respectively disposed on two sides of a movable contact, and the movable contact is respectively contacted with different fixed contacts under the conditions of normal use and fault tripping of a circuit breaker, so as to implement conduction of different alarm circuits, and indicate the normal state and the tripping state of the circuit breaker respectively.

Although the alarm contact is simple in structure and easy to realize, the mutual influence of the two alarm loops often occurs in the using process, so that the problem of poor on-off reliability of the alarm loops is caused.

Disclosure of Invention

In view of the above problems, the embodiment of the present application provides an alarm contact and a circuit breaker, which reduces the problems of poor reliability and low accuracy of alarm in connection and disconnection of an alarm loop, so that the alarm contact can be applied to an environment requiring electrical isolation between two alarm loops.

The embodiment of the application provides an alarm contact on one hand, and the alarm contact comprises a shell, and a contact support, a first fixed contact, a first moving contact, a second fixed contact and a second moving contact which are arranged in the shell.

The contact support is linked with an operating mechanism of the circuit breaker and is used for jumping between a first position and a second position according to whether the operating mechanism is tripped or not; the first position is the position where the contact support is located when the operating mechanism is buckled; the second position is the position where the contact support is located when the operating mechanism is tripped.

The first moving contact and the first fixed contact are used for being connected with the first alarm loop, and the first moving contact is used for being pushed by the contact support to be in contact with the first fixed contact when the contact support jumps to the first position, so that the first alarm loop is conducted.

The second moving contact and the second fixed contact are used for being connected with a second alarm loop, and the second moving contact is used for being pushed by the support of the contact to be in contact with the second fixed contact when the support of the contact jumps to a second position, so that the second alarm loop is conducted.

By adopting the scheme, the two moving contacts, namely the first moving contact and the second moving contact, are arranged, so that when the operating mechanism of the circuit breaker is buckled, the first moving contact is in contact with the first fixed contact, the first alarm loop is conducted, and the circuit breaker is in a normal use state in an auxiliary indication manner; when the operating mechanism of the circuit breaker is tripped, the second moving contact is in contact with the second fixed contact, so that the second alarm loop is switched on to assist in indicating that the circuit breaker is in a fault tripping state. The first moving contact only needs to be in contact with or separated from the first fixed contact in one action and the second moving contact only needs to be in contact with or separated from the second fixed contact in one action along with the jumping action of the contact support between the first position and the second position, so that the first fixed contact and the second fixed contact can be arranged according to actual needs, for example, enough distance can be kept between the first fixed contact and the second fixed contact without limitation of action amplitude supported by the contact, the action of the first moving contact cannot influence the second fixed contact, the action of the second moving contact cannot influence the first fixed contact, electric arcs between the first fixed contact and the first moving contact and electric arcs between the second fixed contact and the second moving contact are prevented from influencing each other, and therefore the problems of poor on-off reliability and low alarm accuracy of two alarm loops under the mutual influence are solved, and the alarm contact can be applied to an environment requiring the electrical isolation of the two alarm loops.

In some embodiments, the first movable contact includes a first elastic sheet, and the first movable contact is separated from the first fixed contact in a natural state of the first elastic sheet. The second moving contact comprises a second elastic sheet, and the second moving contact is separated from the second fixed contact when the second elastic sheet is in a natural state, wherein the natural state refers to a state of not being pushed by external force.

By adopting the scheme, the first elastic sheet and the second elastic sheet have certain elasticity, and in addition, when the first elastic sheet is in a natural state, the first moving contact is separated from the first fixed contact, and when the second elastic sheet is in a natural state, the second moving contact is separated from the second fixed contact, so that the contact support only needs to push the second elastic sheet in the process of jumping from the first position to the second position, the second moving contact is contacted with the second fixed contact, and the first moving contact can rebound to a natural state separated from the first fixed contact under the action of the elasticity of the second elastic sheet without pushing the first elastic sheet; similarly, the contact support only needs to push the first elastic sheet in the process of jumping from the second position to the first position, so that the first moving contact is in contact with the first fixed contact, and the second elastic sheet does not need to be pushed at the same time, so that the second moving contact can be separated from the second fixed contact in the process of recovering the natural state by the second elastic sheet, and the structure of the contact support and the matching relationship between the contact support and other structures are simpler.

In some embodiments, the contact support is disposed between the first moving contact and the second moving contact, and the first fixed contact is disposed on a side of the first moving contact away from the contact support; the second fixed contact is arranged on one side of the second moving contact far away from the contact support.

By adopting the above scheme, the contact supports the in-process of jumping between the first position and the second position, pushes against the first moving contact and keeps away from the second moving contact in the process of being close to the first moving contact, pushes against the second moving contact and keeps away from the first moving contact in the process of being close to the second moving contact, and the pushing against different moving contacts in different processes is realized. In addition, after the layout is carried out, in a limited space, the first moving contact and the second moving contact can be far away from each other, and the first static contact and the second static contact are far away from each other, so that a loop formed by the first moving contact and the first static contact and a loop formed by the second moving contact and the second static contact are prevented from being influenced with each other.

In some embodiments, the contact support is a plate-shaped structure, a first protrusion and a second protrusion are arranged on a first side surface of the plate-shaped structure, the first protrusion is used for pushing the first moving contact towards the first fixed contact, the second protrusion is used for pushing the second moving contact towards the second fixed contact, and the first moving contact and the second moving contact are both located between the first side surface and one of the inner walls of the housing; the first side face is one surface of the plate-shaped structure in the thickness direction.

Through adopting above-mentioned scheme, can set the contact support into thinner platelike structure, in order to reach the effect of save material and reduction in weight, meanwhile, the first arch of setting at platelike structure's first side is used for supporting and pushes away first moving contact, the second arch is used for supporting and pushes away the second moving contact, make the contact support to pushing away more reliable to first moving contact and second moving contact, and through setting up first moving contact and second moving contact between one of them inner wall of first side and casing, make first moving contact and second moving contact receive the restriction of one of them inner wall of first side and casing, be difficult to produce the skew, thereby keep with first arch or the bellied reliable butt of second.

In some embodiments, the first side surface is further provided with a third protrusion and a fourth protrusion, the first movable contact is at least partially located between the first protrusion and the third protrusion, and the second movable contact is at least partially located between the second protrusion and the fourth protrusion; the third bulge is used for pushing the first moving contact to move in a direction far away from the first fixed contact in the process that the contact support jumps from the first position to the second position; the fourth protrusion is used for pushing the second moving contact to move in a direction away from the second fixed contact in the process that the contact support jumps from the second position to the first position.

By adopting the above scheme, under the condition that the first moving contact cannot automatically recover to be far away from the first fixed contact after being separated from the abutting of the first bulge, the third bulge can push the first moving contact in the process that the contact supports jumping from the first position to the second position, so that the first moving contact moves towards the direction far away from the first fixed contact, and the first moving contact and the first fixed contact can be reliably separated in the process. Similarly, the fourth protrusion can push the second moving contact in the process that the contact supports jumping from the second position to the first position, so that the second moving contact moves towards the direction far away from the second fixed contact, and the second moving contact and the second fixed contact can be reliably separated in the process. Therefore, the arrangement can increase the alarm reliability of the alarm contact to different states of the circuit breaker.

In some embodiments, a first moving silver point is disposed on the first moving contact, a first static silver point is disposed on the first static contact, a convex portion is disposed on at least one of the first static silver point and the first moving silver point, and the first static silver point and the first moving silver point are in contact through the convex portion.

By adopting the scheme, the first movable silver point is contacted with the first static silver point through the convex part, so that the contact area of the first movable silver point and the first static silver point is reduced, charges are collected and circulated at the convex part, the application of the alarm contact in an alarm loop with lower capacity is facilitated, and the phenomenon of unreliable switch-on of the alarm loop with low capacity is prevented.

In some embodiments, the projections are elongated projections; when the first static silver point and the first movable silver point are respectively provided with the convex parts, the convex part on the first movable silver point and the convex part on the first static silver point have a non-zero included angle in the space.

Through adopting above-mentioned scheme, the top area of rectangular form convex part is bigger, can reduce the unable problem that passes through the convex part contact of first quiet silver point and second quiet silver point. When the first static silver point and the first movable silver point are respectively provided with the convex parts, the convex parts on the first movable silver point and the convex parts on the first static silver point have non-zero included angles in the space, so that when the first movable silver point and the first static silver point are close to each other, the contact range of the convex parts on the first movable silver point and the convex parts on the first static silver point is wider, and the problem that the first movable silver point and the second static silver point cannot be contacted through the convex parts is further reduced.

In some embodiments, the alarm contacts further comprise: stop platform, spacing portion, supporting part and the piece that resets.

The stop table is arranged on a handle of the alarm contact, the stop table rotates along with the handle in the opening and closing process of the alarm contact to form a first rotating track, and one side of the first rotating track, which is far away from the support of the contact, is a limiting area.

The limiting part is arranged on the contact support and moves along with the contact support, when the contact support is located at the first position, the limiting part is located in the limiting area, and when the contact support is located at the second position, the limiting part is not located in the limiting area.

The supporting piece is arranged on one side supported by the contact, swings along with the opening and closing of the alarm contact, and is linked with the operating mechanism of the circuit breaker.

And a reset member having one end connected to the housing and the other end connected to the contact support, the reset member having a tendency to cause the contact support to jump from the first position to the second position.

When the alarm contact is opened under the buckling state of the operating mechanism of the circuit breaker, the stop table is positioned on the motion path of the limiting part so as to limit the limiting part in the limiting area; when the alarm contact is switched on, the stop table is not positioned on the motion path of the limiting part, and the contact supports the support piece to be abutted so that the limiting part is positioned in the limiting area.

When the operating mechanism of the circuit breaker is in a tripping state, the supporting piece is separated from the contact support, so that the contact support jumps to the second position under the elastic force of the resetting piece.

By adopting the above scheme, under the operating device lock state of circuit breaker, when the warning contact breaks off, spacing portion receives the restriction of backstop platform and is located spacing district, when the warning contact closes the floodgate, the contact supports the butt that receives the supporting piece and makes spacing portion also be located spacing district, that is to say, under the operating device lock state of circuit breaker, spacing portion is located spacing district all the time to make the contact support be located the first position all the time, under this condition, first moving contact and first static contact keep in contact and do not receive the influence of warning contact divide-shut brake. When the operating mechanism of the circuit breaker is in a tripping state, the supporting piece is separated from the abutting connection with the contact support, so that the contact support jumps to the second position under the elastic force of the resetting piece, the contact support pushes the second moving contact so as to enable the second moving contact to be in contact with the second fixed contact, the switching-on of an alarm loop under the tripping condition of the operating mechanism is realized, and the alarm under the tripping condition of the operating mechanism is further realized. The alarm contact has reasonable structural design and compact matching among components, is favorable for leading the alarm contact to be respectively connected with different alarm loops under the conditions of buckling and tripping of the operating mechanism of the circuit breaker, and realizes accurate indication of different states of the circuit breaker.

In some embodiments, the contact support is provided with a first mating portion and the support member is provided with a second mating portion; after an operating mechanism of the circuit breaker is tripped and buckled again, the second matching part is used for being abutted against the first matching part in the first closing process of the alarm contact to push the contact support to jump from the second position to the first position.

By adopting the scheme, after the operating mechanism of the circuit breaker is tripped and buckled again, when the alarm contact drives the supporting piece to swing in the first closing process, the contact support is pushed to jump from the second position to the first position through the butting of the second matching part and the first matching part, so that the circuit where the second moving contact and the second fixed contact are located is disconnected, the circuit where the first moving contact and the first fixed contact are located is connected, and the indication state of the alarm contact conforms to the buckling state of the operating mechanism of the circuit breaker.

In some embodiments, the contact support is provided with a kidney-shaped hole, one side of the support piece, which is close to the contact support, is provided with a convex column, the first matching part is configured as a hole wall of the kidney-shaped hole, and the second matching part is configured as the convex column; or a convex column is arranged on one side of the contact support close to the support piece, a waist-shaped hole is arranged on the support piece, the first matching part is configured to be the convex column, and the second matching part is configured to be the hole wall of the waist-shaped hole; when the contact support is at the first position, the support swings with the switch of the alarm contact, and the convex column moves in the kidney-shaped hole.

By adopting the scheme, when the contact support and the support piece do not need to move together, the convex column occupies partial space in the kidney-shaped hole in the swinging process, so that the partial space is reused; when the contact support moves along with the support piece, the convex column is abutted against the hole wall of the waist-shaped hole, and the part where the waist-shaped hole is located is pushed to move by the part where the convex column is located, or the part where the waist-shaped hole is located is pushed to move by the part where the waist-shaped hole is located, so that the purpose that the contact support moves along with the support piece is achieved.

According to another aspect of the embodiments of the present application, a circuit breaking device with an alarm contact is provided, which comprises a circuit breaker and the alarm contact in any of the embodiments of the above subject, wherein the circuit breaker and the alarm contact are assembled.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of the contact support in the first position and the alarm contact in the open state.

Fig. 2 is a schematic structural diagram of the contact support in the first position and the alarm contact in a closing state.

FIG. 3 is a schematic diagram of the structure of the contact support at the second position and the alarm contact in the opening state

Fig. 4 is a schematic structural diagram of a first movable contact in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a first stationary contact according to an embodiment of the present application.

Fig. 6 is a schematic view of the structure of the contact support.

Fig. 7 is an exploded view of the contact support and support member.

Description of reference numerals: 1. a housing; 2. a first terminal; 3. a second terminal; 4. a third terminal; 5. a fourth terminal; 6. a contact support; 7. a first fixed contact; 71. a first static silver point; 8. a first moving contact; 81. a first spring plate; 82. a first movable silver point; 83. a first lug plate; 9. a second fixed contact; 10. a second moving contact; 11. a convex portion; 12. a first protrusion; 13. a second protrusion; 14. a third protrusion; 15. a fourth protrusion; 16. a stop table; 17. a limiting part; 18. a support member; 19. a reset member; 20. a first mating portion; 21. a second mating portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and in the description of the figures are intended to cover, but not exclude, other things. The word "a" or "an" does not exclude the presence of a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

The term "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "coupling" of circuit structures may mean not only physical coupling but also electrical or signal coupling, for example, direct coupling, i.e., physical coupling, or indirect coupling via at least one element therebetween, as long as electrical communication is achieved, or communication between the two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The problem that two alarm loops influence each other and the alarm accuracy reduces often appears in the alarm contact among the correlation technique in the use.

The inventor finds that, in the alarm contact, two static contacts are generally arranged on two sides of a moving contact, and the two static contacts are respectively located on two sides of the moving contact, and are contacted with a first static contact when the moving contact swings towards a first side to connect a first alarm loop, and are contacted with a second static contact when the moving contact swings towards a second side to connect a second alarm loop.

In view of the above problems, the embodiment of the present application provides an alarm contact and a circuit breaker, which reduces the problem of poor reliability of the on/off state of an alarm loop caused by the mutual influence of two alarm loops, and expands the application range of the alarm contact.

Fig. 1 is a schematic structural view of a contact support located at a first position and an alarm contact located in an opening state, fig. 2 is a schematic structural view of the contact support located at the first position and the alarm contact located in a closing state, and fig. 3 is a schematic structural view of the contact support located at a second position and the alarm contact located in an opening state. As shown in fig. 1, fig. 2 and fig. 3, an alarm contact provided in an embodiment of the present application includes a housing 1, and a contact support 6, a first stationary contact 7, a first movable contact 8, a second stationary contact 9 and a second movable contact 10 that are disposed in the housing 1.

The contact support 6 is linked with an operating mechanism of the circuit breaker and is used for jumping between a first position and a second position according to whether the operating mechanism is tripped or not; as shown in fig. 1 and 2, the first position is a position where the contact support 6 is located when the operating mechanism is engaged; as shown in fig. 3, the second position is the position of the contact support 6 when the operating mechanism is tripped.

The first moving contact 8 and the first fixed contact 7 are used for connecting with a first alarm loop, and the first moving contact 8 is used for contacting with the first fixed contact 7 under the push of the contact support 6 when the contact support 6 jumps to the first position, so that the first alarm loop is conducted.

The second moving contact 10 and the second fixed contact 9 are used for connecting with a second alarm loop, and the second moving contact 10 is used for being pushed by the contact support 6 to contact with the second fixed contact 9 when the contact support 6 jumps to a second position, so that the second alarm loop is conducted.

The shell 1 is thin-walled, an accommodating cavity is formed in the shell 1, and the first fixed contact 7, the first movable contact 8, the second fixed contact 9, the second movable contact 10 and other components are accommodated in the accommodating cavity, so that the precise components are protected by the shell 1 from external interference. The housing 1 may be integrally formed, or may be composed of two, three, or four parts, for example, in some embodiments, the housing 1 includes two parts that are fastened to each other, the two parts are half-shell-shaped respectively, and after the two parts are fastened, a relatively closed inner space is formed, or one part is half-shell-shaped and the other part is plate-shaped, and the plate-shaped part covers the opening of the half-shell-shaped, so that a relatively closed space is formed between the two parts. Wherein the relative closure does not preclude the housing 1 being provided with necessary apertures, such as wiring holes, assembly gaps or heat dissipation holes.

The first alarm circuit and the second alarm circuit are different alarm circuits, the first moving contact 8 and the first fixed contact 7 are connected with the first alarm circuit, the second moving contact 10 and the second fixed contact 9 are connected with the second alarm circuit, so that the on-off of the first moving contact 8 and the first fixed contact 7 can control the on-off of the first alarm circuit, and the on-off of the second moving contact 10 and the second fixed contact 9 can control the on-off of the second alarm circuit. Illustratively, at least four connection terminals are arranged on the shell of the alarm contact, which are a first connection terminal 2, a second connection terminal 3, a third connection terminal 4 and a fourth connection terminal 5, respectively, the first connection terminal 2 is connected with a first fixed contact 7, the second connection terminal 3 is connected with a first movable contact 8, the third connection terminal 4 is connected with a second fixed contact 9, and the fourth connection terminal 5 is connected with a second movable contact 10.

The first terminal 2, the second terminal 3, the third terminal 4 and the fourth terminal 5 are parts of the alarm contact for connecting an external conductor, for example, an external circuit is a first alarm loop, the first alarm loop has two conducting wires connected to the first terminal 2 and the second terminal 3 respectively, and when the first movable contact 8 contacts the first fixed contact 7, the first alarm loop is connected with the first terminal 2, the first fixed contact 7, the first movable contact 8 and the second terminal 3 in sequence to form a loop, so that the first alarm loop is conducted. The structure and the using method of the third terminal 4 and the fourth terminal 5 can be the same as those of the first terminal 2 and the second terminal 3, except that the conduction of the second alarm loop connected to the third terminal 4 and the fourth terminal 5 needs to be realized by the contact between the second movable contact 10 and the second fixed contact 9. The structures of the first terminal 2, the second terminal 3, the third terminal 4 and the fourth terminal 5 may be the same as or different from those of the terminal in the related art, as long as the connection of an external conductor is facilitated, which is not limited in the embodiment of the present application.

The operating device of circuit breaker belongs to the comparatively ripe technique in the circuit breaker field, and this application embodiment does not do special limit to circuit breaker and operating device. The contact support 6 is linked with an operating mechanism of the circuit breaker, and is used for jumping between a first position and a second position along with whether the operating mechanism is tripped or not, wherein the jumping can be moving or swinging, the first position is the position where the contact support 6 is located in a buckling state of the operating mechanism of the circuit breaker, and the second position is the position where the contact support 6 is located in a tripping state of the operating mechanism of the circuit breaker, wherein the buckling state refers to that a lock catch and a trip catch of the operating mechanism are in a buckling state, when the operating mechanism is in the buckling state, the circuit breaker can normally open and close the circuit without influencing the buckling state of the operating mechanism, namely, in the normal opening and closing process of the circuit breaker, as long as the operating mechanism is in the buckling state, the contact support 6 is located at the first position, so that the first movable contact 8 is always in a state of contacting with the first fixed contact 7; when the circuit breaker is abnormal, the operating mechanism is tripped under the action of the tripping component, for example, the latch of the operating mechanism is disengaged from the trip, at this time, the contact support 6 jumps from the first position to the second position, and in the process, the second moving contact 10 is pushed against, so that the second moving contact 10 is contacted with the second fixed contact 9, and meanwhile, because the pushing of the contact support 6 is disengaged, the first moving contact 8 moves in the direction away from the first fixed contact 7 and is not contacted with the first fixed contact 7.

Because the first moving contact 8 needs to be pushed by the contact support 6 to be close to or far from the first fixed contact 7, and the second moving contact 10 needs to be pushed by the contact support 6 to be close to or far from the second fixed contact 9, at least one end of the first moving contact 8 and the second moving contact 10 needs to be capable of moving when being subjected to an external force, taking the first moving contact 8 as an example, the first moving contact 8 can be connected in the housing 1 in a sliding manner and can slide towards a direction close to or far from the first fixed contact 7 under the pushing of the contact support 6; the first moving contact 8 can also be rotatably arranged in the shell 1, and under the pushing action of the contact support 6, the first moving contact 8 can rotate around the position of the rotary connection, so that one end of the first moving contact is close to or far away from the first fixed contact 7; the first movable contact 8 may also be fixedly connected in the housing 1, and the movable contact can deform, for example, can bend, under the action of an external force, so that when the contact support 6 pushes against the first movable contact 8, the first movable contact 8 deforms, thereby moving closer to or away from the first stationary contact 7. The structure of the second movable contact 10 may be the same as or different from that of the first movable contact 8, but there are no exceptions to the above, and this embodiment of the present application does not give any detailed examples of the possible structure of the second movable contact 10.

When the alarm contact is used, a first alarm loop can be connected to the first terminal 2 and the second terminal 3, a second alarm loop can be connected between the third terminal 4 and the fourth terminal 5, alarm components such as an indicator light, an electric bell or a buzzer can be connected to the first alarm loop and the second alarm loop, and when a circuit where a certain display component is located is connected, the alarm components display or remind the state of the circuit breaker through colors, sounds and the like.

Obviously, when the operating mechanism of the circuit breaker is buckled, the first moving contact 8 is in contact with the first fixed contact 7, so that the first terminal 2, the first fixed contact 7, the first moving contact 8 and the second terminal 3 are sequentially connected to form a loop, the first alarm loop is connected, and the alarm component connected to the first alarm loop indicates that the circuit breaker is in a normal use state through color, sound or other auxiliary indication. When an operating mechanism of the circuit breaker is tripped abnormally, the second moving contact 10 is in contact with the second fixed contact 9, the third wiring terminal 4, the second fixed contact 9, the second moving contact 10 and the fourth wiring terminal 5 are sequentially connected to form a loop, the second alarm loop is connected, and the alarm component connected to the second alarm loop indicates that the circuit breaker is in a fault tripping state through color, sound or other assistance.

To sum up, in the embodiment of the present application, by providing two moving contacts, that is, the first moving contact 8 and the second moving contact 10, along with the jumping motion of the contact support 6 between the first position and the second position, the first moving contact 8 only needs to be in contact with or separated from the first fixed contact 7 in one motion, and does not need to be in contact with both the first fixed contact 7 and the second fixed contact 9 in one motion of the contact support 6; meanwhile, the second movable contact 10 only needs to be in contact with or separated from the second fixed contact 9 in one action, and does not need to be in contact with the first fixed contact 7 as well as separated from the second fixed contact 9 in one action of the contact support 6, so that the first fixed contact 7 and the second fixed contact 9 can be set according to actual needs, for example, a sufficient distance can be kept between the first fixed contact 7 and the second fixed contact 9 without being limited by the action amplitude of the contact support 6, the action of the first movable contact 8 cannot influence the second fixed contact 9, the action of the second movable contact 10 cannot influence the first fixed contact 7, electric arcs between the first fixed contact 7 and the first movable contact 8 and electric arcs between the second fixed contact 9 and the second movable contact 10 are prevented from influencing each other, so that the on-off of the first alarm loop and the second alarm loop cannot be influenced mutually, the accuracy and the reliability of the alarm time of the alarm contact are improved, and the alarm device is particularly suitable for being used in occasions requiring complete electrical isolation of the two alarm loops.

Fig. 4 is a schematic structural diagram of the first movable contact 8 in an embodiment of the present application, as shown in fig. 4, in some embodiments, the first movable contact 8 includes a first elastic sheet 81 and a first movable silver point 82, the first movable silver point 82 faces the first fixed contact 7, and when the first elastic sheet 81 is in a natural state, the first movable silver point 82 is separated from the first fixed contact 7. The second moving contact 10 includes a second elastic sheet and a second moving silver point, the second moving silver point faces the second fixed contact, and when the second elastic sheet is in a natural state, the second moving silver point is separated from the second fixed contact 9, wherein the natural state is a state where the second moving silver point is not pushed by an external force.

The first elastic sheet 81 and the second elastic sheet have certain elasticity, and in addition, when the first elastic sheet 81 is in a natural state, the first movable silver point 82 is separated from the first fixed contact 7, and when the second elastic sheet is in a natural state, the second movable silver point is separated from the second fixed contact 9, so that the contact support 6 only needs to be capable of pushing against the second elastic sheet in the process of jumping from the first position to the second position, the second movable silver point is in contact with the second fixed contact 9, the first elastic sheet 81 does not need to be pushed against, and the first elastic sheet 81 can automatically drive the first movable silver point 82 to rebound to be in a natural state of being separated from the first fixed contact 7; similarly, in the process of jumping from the second position to the first position, the contact support 6 only needs to push the first elastic sheet 81 to make the first movable silver point 82 contact with the first fixed contact 7, and does not need to push the second elastic sheet at the same time, and the second elastic sheet can be separated from the second fixed contact 9 in the process of recovering the natural state, so that the structure of the contact support 6 and the matching relationship between the contact support 6 and other structures are simpler.

In order to be more easily elastically deformed, the thicknesses of the first elastic sheet 81 and the second elastic sheet are generally set to be thinner, so that if the first elastic sheet 81 is directly connected with the second terminal 3 and the second elastic sheet is directly connected with the fourth terminal 5, when the alarm circuit is connected, the phenomena of poor contact between the first elastic sheet 81 or the second elastic sheet and the alarm circuit and unstable electrical performance may exist.

In view of this, taking the first movable contact 8 as an example, as shown in fig. 4, in some embodiments, the first movable contact 8 further includes a first connecting tab 83, a thickness of the first connecting tab 83 is greater than a thickness of the first elastic sheet 81, the first connecting tab 83 is connected to an end of the first elastic sheet 81 far away from the first movable contact 82, and the first movable contact 8 is connected to the second terminal 3 through the first connecting tab 83.

The embodiment of the application does not limit the elasticity of the first lug 83, because as long as the thickness of the first lug 83 is larger, when the first alarm circuit is connected, the connection stability of the first lug 83 and the second terminal 3 can be more stable than that of the second terminal 3 directly connected with the first elastic sheet 81, and when the first alarm circuit is connected behind the second terminal 3, the electrical connection stability between the first alarm circuit and the first lug 83 is stronger, so that the indication result of the alarm contact is more accurate and reliable.

The first tab 83 and the first elastic sheet 81 may be made of the same material or different materials, and the connection manner of the first tab 83 and the first elastic sheet 81 may be riveting, welding, or punch forming, which is not limited in this application.

The structure of the second movable contact 10 can also refer to the structure of the first movable contact 8, and the structure of the second movable contact 10 is not described in detail in this embodiment of the application.

Fig. 5 is a schematic structural view of a first fixed contact 7 in an embodiment of the present application, and as shown in fig. 5, in some embodiments, a first fixed silver point 71 is disposed on the first fixed contact 7.

The first static silver point 71 is a silver portion on the first static contact 7, and because the conductivity coefficient of silver is relatively large, when the first moving contact 8 and the first static contact 7 contact the first static silver point 71 through the first moving silver point 82, even if the contact area is relatively small, the contact position can have relatively small resistance, which is beneficial to the current flowing through the contact position.

The first static silver point 71 and the first moving silver point 82 are similar in structure, for example, in some embodiments, the first static silver point 71 is disposed near the first moving contact 8 and has a structure similar to a coin shape, and the first moving silver point 82 is disposed near the first stationary contact 7 and has a structure similar to a coin shape. The first moving contact 8 is in contact with the first fixed contact 7 through the end face of the coin-shaped structure of the first moving silver point 82 and the first fixed silver point 71.

In other embodiments, as shown in fig. 4 and 5, at least one of the first static silver point 71 and the first movable silver point 82 is provided with a convex portion 11, and the first static silver point 71 and the first movable silver point 82 are contacted by the convex portion 11.

In a specific implementation manner, the convex portion 11 may be provided only on the first silver static point 71, or only the convex portion 11 may be provided on the first movable silver point 82, or both the first silver static point 71 and the first movable silver point 82 may be provided with the convex portion 11, and the convex portion 11 is a structure that protrudes from a relatively flat surface, for example, protrudes from an end surface of a coin-shaped structure, and when the first movable silver point 82 and the first silver static point 71 approach each other, the convex portion 11 first contacts each other, so that the first silver static point 71 and the first movable silver point 82 contact each other through the convex portion 11.

In the scheme, the first movable silver point 82 is contacted with the first static silver point 71 through the convex part 11, so that the contact area of the first movable silver point 82 and the first static silver point 71 is reduced, charges are collected and circulated at the convex part 11, the application of the alarm contact in an alarm loop with lower capacity is facilitated, and the phenomenon of unreliable connection of the alarm loop with low capacity is prevented.

As shown in fig. 4 and 5, in some embodiments, the convex portion 11 is an elongated protrusion; when the first static silver point 71 and the first movable silver point 82 are respectively provided with the convex part 11, the convex part 11 on the first movable silver point 82 and the convex part 11 on the first static silver point 71 have a non-zero included angle in space.

The area of the top of the elongated projection 11 is larger, and the problem that the first and second silver static points 71 and 11 cannot come into contact with each other can be reduced.

When the first silver static point 71 and the first silver static point 82 are respectively provided with the convex part 11, the convex part 11 on the first silver static point 82 and the convex part 11 on the first silver static point 71 have a non-zero included angle in the space, so that when the first silver static point 82 and the first silver static point 71 approach each other, the contact range between the convex part 11 on the first silver static point 82 and the convex part 11 on the first silver static point 71 is wider, and the problem that the first silver static point 71 and the first silver static point 71 cannot contact through the convex part 11 is further reduced.

For example, in some embodiments, the convex portion 11 on the first moving silver point 82 is substantially perpendicular to the rotation plane of the first moving contact 8 along the length direction, and the convex portion 11 on the first static silver point 71 is substantially parallel to the rotation plane of the first moving contact 8 along the length direction. Thus, the convex portion 11 on the first movable silver point 82 and the convex portion 11 on the first fixed silver point 71 can be in crisscross contact, and when the first movable contact 8 approaches the first fixed contact 7, even if the track and the angle of the first movable silver point 82 are deviated, the convex portion 11 on the first fixed silver point 71 is not easily deviated, so that the reliable contact between the convex portion 11 on the first fixed silver point 71 and the convex portion 11 on the first movable silver point 82 is ensured.

In some embodiments, the protruding portion 11 on the first movable silver point 82 may be provided with a plurality of protruding portions 11, and similarly, the protruding portion 11 on the first fixed silver point 71 may also be provided with a plurality of protruding portions 11, so that the number of contact points between the first fixed silver point 71 and the first movable silver point 82 can be increased, the contact resistance between the first movable contact 8 and the first stationary contact 7 is reduced, stable passage of current between the first movable silver point 82 and the first fixed silver point 71 is facilitated, and electrical loss is reduced.

As shown in fig. 1, 2 and 3, in some embodiments, the contact support 6 is disposed between the first movable contact 8 and the second movable contact 10, and the first stationary contact 7 is disposed on a side of the first movable contact 8 away from the contact support 6; the second fixed contact 9 is arranged on the side of the second movable contact 10 far away from the contact support 6.

By adopting the above scheme, in the process of jumping between the first position and the second position, the contact support 6 pushes against the first moving contact 8 and is far away from the second moving contact 10 in the process of approaching the first moving contact 8, and pushes against the second moving contact 10 and is far away from the first moving contact 8 in the process of approaching the second moving contact 10, so that pushing against different moving contacts in different processes is realized. In addition, after the layout is carried out, the distance between the first moving contact 8 and the second moving contact 10 can be far, and the distance between the first fixed contact 7 and the second fixed contact 9 is far, so that a loop formed by the first moving contact 8 and the first fixed contact 7 and a loop formed by the second moving contact 10 and the second fixed contact 9 are prevented from being influenced with each other.

In some embodiments, the contact support 6 is used to push the first movable contact 8 near the edge of the first movable contact 8, and to push the second movable contact 10 near the edge of the second movable contact 10.

By adopting the scheme, the first moving contact 8 and the second moving contact 10 can be pushed by utilizing the edge of the contact support 6, a pushing structure is not required to be additionally arranged on the contact support 6, and the structure of the contact support 6 is simpler.

Fig. 6 is a schematic structural diagram of a contact support, as shown in fig. 6, in some embodiments, the contact support 6 is a plate-shaped structure, a first side surface of the plate-shaped structure is provided with a first protrusion 12 and a second protrusion 13, the first protrusion 12 is used for pushing the first movable contact 8 toward the first fixed contact 7, the second protrusion 13 is used for pushing the second movable contact 10 toward the second fixed contact 9, and both the first movable contact 8 and the second movable contact 10 are located between the first side surface and one of the inner walls of the housing 1; wherein, the first side is one surface of the plate-shaped structure in the thickness direction.

By adopting the above scheme, the contact support 6 can be set to be a thin plate-shaped structure, so as to achieve the effects of saving materials and reducing weight, meanwhile, the first protrusion 12 arranged on the first side surface of the plate-shaped structure is used for pushing against the first moving contact 8, and the second protrusion 13 is used for pushing against the second moving contact 10, so that the pushing against of the contact support 6 to the first moving contact 8 and the second moving contact 10 is more reliable, and the first moving contact 8 and the second moving contact 10 are arranged between the first side surface and one of the inner walls of the shell 1, so that the first moving contact 8 and the second moving contact 10 are limited between the first side surface and one of the inner walls of the shell 1, and the offset is not easy to generate, thereby maintaining the reliable abutting between the first protrusion 12 or the second protrusion 13.

As shown in fig. 6, in some embodiments, the first side surface is further provided with a third protrusion 14 and a fourth protrusion 15, the first movable contact 8 is at least partially located between the first protrusion 12 and the third protrusion 14, and the second movable contact 10 is at least partially located between the second protrusion 13 and the fourth protrusion 15; the third protrusion 14 is used for pushing the first movable contact 8 to move away from the first fixed contact 7 in the process that the contact support 6 jumps from the first position to the second position; the fourth protrusion 15 is used for pushing the second movable contact 10 to move away from the second fixed contact 9 in the process that the contact support 6 jumps from the second position to the first position.

By adopting the above scheme, after the first movable contact 8 is separated from the first protrusion 12, and cannot be automatically restored to the state of being away from the first fixed contact 7, the third protrusion 14 can push the first movable contact 8 in the process that the contact support 6 jumps from the first position to the second position, so that the first movable contact 8 moves in the direction away from the first fixed contact 7, thereby ensuring that the first movable contact 8 and the first fixed contact 7 can be reliably separated in the process. Similarly, the fourth protrusion 15 can push the second moving contact 10 in the process that the contact support 6 jumps from the second position to the first position, so that the second moving contact 10 moves in the direction away from the second fixed contact 9, thereby ensuring that the second moving contact 10 and the second fixed contact 9 can be reliably separated in the process. Therefore, the arrangement can increase the alarm reliability of the alarm contact to different states of the circuit breaker.

As shown in fig. 1, 2 and 3, in some embodiments, the alarm contacts further comprise: a stop table 16, a limit part 17, a support 18 and a reset piece 19.

The stopping table 16 is arranged on a handle of the alarm contact, the stopping table 16 rotates along with the handle in the switching-on and switching-off process of the alarm contact to form a first rotating track, and one side of the first rotating track, which is far away from the contact support 6, is a limiting area.

The limiting part 17 is arranged on the contact support 6 and moves along with the contact support 6, when the contact support 6 is positioned at the first position, the limiting part 17 is positioned in the limiting area, and when the contact support 6 is positioned at the second position, the limiting part 17 is not positioned in the limiting area.

The supporting piece 18 is arranged on one side of the contact support 6, the supporting piece 18 swings along with the opening and closing of the alarm contact, and the supporting piece 18 is linked with an operating mechanism of the circuit breaker.

The reset element 19 is connected at one end to the housing 1 and at the other end to the contact support 6, the reset element 19 having a tendency to cause the contact support 6 to jump from the first position to the second position.

As shown in fig. 1, in a buckling state of an operating mechanism of the circuit breaker, when the alarm contact is opened, the stopping table 16 is located on a moving path of the limiting part 17 to limit the limiting part 17 in a limiting area; as shown in fig. 2, when the alarm contact is closed, the stopper 16 is not located on the movement path of the stopper 17, and the contact support 6 is abutted by the support member 18 so that the stopper 17 is located in the stopper region.

As shown in fig. 3, in the tripped state of the operating mechanism of the circuit breaker, the supporting member 18 is out of contact with the contact holder 6, and the contact holder 6 jumps to the second position by the elastic force of the reset member 19.

The stopping table 16 may be an elongated shape disposed along the first rotation track, and when the stopping table 16 is located on the movement path of the limiting portion 17, the stopping table 16 can have a larger abutting area with the limiting portion 17 to prevent the limiting portion 17 from being separated from the limiting region.

Since the stopper portion 17 is provided in the contact holder 6 and moves with the contact holder 6, the contact holder 6 can be restricted to the first position only by restricting the stopper portion 17 in the stopper region.

Reset piece 19 can make contact support 6 jump to the second position automatically when not receiving external force to support and push, and reset piece 19 can be the extension spring, also can be the torsional spring, and this application does not limit to this.

According to the scheme, in the buckling state of the operating mechanism of the circuit breaker, when the alarm contact is opened, the limiting part 17 is limited by the stop table 16 and is located in the limiting area, when the alarm contact is closed, the contact support 6 is abutted by the support piece 18 to enable the limiting part 17 to be located in the limiting area, namely, in the buckling state of the operating mechanism of the circuit breaker, the limiting part 17 is always located in the limiting area, so that the contact support 6 is always located in the first position, and in this case, the first movable contact 8 is in contact with the first fixed contact 7 and is not affected by the opening and closing of the alarm contact.

In the tripping state of the operating mechanism of the circuit breaker, because the supporting member 18 is separated from the abutting connection with the contact support 6, the contact support 6 jumps to the second position under the elastic force of the resetting member 19, so that the contact support 6 pushes the second movable contact 10 to make the second movable contact 10 contact with the second fixed contact 9, thereby realizing the switching-on of the alarm loop under the tripping condition of the operating mechanism and further realizing the alarm under the tripping condition of the operating mechanism.

The alarm contact has reasonable structural design and compact matching among components, is favorable for enabling the alarm contact to be respectively connected with different alarm loops under the conditions of buckling and tripping of the operating mechanism of the circuit breaker, and realizes accurate indication of different states of the circuit breaker.

Fig. 7 is a schematic view of an exploded structure of the contact support and support member, as shown in fig. 7, in some embodiments, a first mating portion 20 is provided on the contact support 6, and a second mating portion 21 is provided on the support member 18; after the operating mechanism of the circuit breaker is tripped and buckled again, the second matching part 21 is used for abutting against the first matching part 20 in the first closing process of the alarm contact to push the contact support 6 to jump from the second position to the first position.

In some embodiments, the support member 18 and the contact support 6 may be both configured in a plate shape, and the support member 18 and the contact support 6 are configured substantially in parallel, so that they occupy less space in the housing 1, which is beneficial for the reasonable layout of the components in the housing 1.

By adopting the above scheme, after the operating mechanism of the circuit breaker is tripped and buckled again, when the alarm contact drives the supporting piece 18 to swing in the first closing process, the contact support 6 is pushed to jump from the second position to the first position by the abutting of the second matching part 21 and the first matching part 20, so that the loop where the second moving contact 10 and the second fixed contact 9 are located is disconnected, the first moving contact 8 and the first fixed contact 7 are connected, and the indication state of the alarm contact conforms to the buckling state of the operating mechanism of the circuit breaker.

The first and second engaging portions 20 and 21 may have various structures.

For example, as shown in fig. 7, in some embodiments, a kidney-shaped hole is formed on the contact support 6, a convex pillar is formed on the support 18 near the contact support 6, the first mating portion 20 is configured as a hole wall of the kidney-shaped hole, and the second mating portion 21 is configured as a convex pillar; or, a convex column is arranged on one side of the contact support 6 close to the support 18, a kidney-shaped hole is arranged on the support 18, the first matching part 20 is configured as the convex column, and the second matching part 21 is configured as the hole wall of the kidney-shaped hole; the convex column is used for abutting against the hole wall of the waist-shaped hole in the switching-on process of the alarm contact to push the contact support 6 to jump from the second position to the first position; when the contact support 6 is at the first position, the support 18 swings with the switch-on and switch-off of the alarm contact, and the convex column moves in the kidney-shaped hole.

By adopting the scheme, when the contact support 6 and the support piece 18 do not need to move together, the convex column occupies part of space in the kidney-shaped hole in the swinging process, so that the part of space is reused; when the contact support 6 moves along with the support 18, the convex column is abutted against the hole wall of the waist-shaped hole, and the part where the waist-shaped hole is located is pushed to move by the part where the convex column is located, or the part where the convex column is located is pushed to move by the part where the waist-shaped hole is located, so that the purpose that the contact support 6 moves along with the support 18 is achieved.

In other embodiments, the contact support 6 is provided with a notch, the first matching portion 20 is a notch side wall arranged on the contact support 6, the second matching portion 21 is a convex handle arranged on the support 18, and the convex handle is used for abutting against the notch side wall to push the contact support 6 to jump from the second position to the first position in the process of closing the alarm contact; when the contact support 6 is in the first position, the support member 18 swings along with the switching-on and switching-off of the alarm contact, and the convex handle moves in the notch.

According to another aspect of the embodiments of the present application, a circuit breaking device with an alarm contact is provided, which comprises a circuit breaker and the alarm contact in any of the embodiments of the above subject, wherein the circuit breaker and the alarm contact are assembled.

The alarm contact can be spliced on one side of the shell of the circuit breaker, the alarm contact is connected with the circuit breaker through a linkage piece penetrating through the shell wall of the circuit breaker and the shell wall of the alarm contact, one end of the linkage piece is matched with an operating mechanism of the circuit breaker, and the other end of the linkage piece is matched with the contact support of the alarm contact, so that the linkage of the operating mechanism and the contact support is realized. The cooperation between the linkage member and the operating mechanism and the cooperation between the linkage member and the contact support may be direct or indirect, which is not limited in the embodiments of the present application.

The alarm contact in any embodiment has the advantages of less interference among different alarm loops, high alarm accuracy and reliability and suitability for being used in occasions requiring complete electrical isolation of the two alarm loops, so that the circuit breaking device using the alarm contact also has the beneficial effects.

Those of skill in the art will understand that while some embodiments herein include certain features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above examples are only intended to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.

Claims (11)

1. An alarm contact, comprising: the device comprises a shell, and a contact support, a first fixed contact, a first moving contact, a second fixed contact and a second moving contact which are arranged in the shell;

the contact support is linked with an operating mechanism of the circuit breaker and is used for jumping between a first position and a second position along with whether the operating mechanism is tripped or not; the first position is a position where the contact support is located when the operating mechanism is buckled; the second position is a position where the contact support is located when the operating mechanism is tripped;

the first moving contact and the first fixed contact are used for being connected with a first alarm loop, and the first moving contact is used for being pushed by the contact support to be in contact with the first fixed contact when the contact support jumps to the first position, so that the first alarm loop is conducted;

the second moving contact and the second fixed contact are used for being connected with a second alarm loop, and the second moving contact is used for being pushed by the contact support to be in contact with the second fixed contact when the contact support jumps to the second position, so that the second alarm loop is conducted.

2. The alarm contact according to claim 1, wherein the first movable contact comprises a first spring, and the first movable contact is separated from the first fixed contact when the first spring is in a natural state;

the second moving contact comprises a second elastic sheet, and when the second elastic sheet is in a natural state, the second moving contact is separated from the second fixed contact;

the natural state refers to a state that is not pushed by an external force.

3. The alarm contact as claimed in claim 1 or 2, wherein the contact support is disposed between the first movable contact and the second movable contact, and the first stationary contact is disposed on a side of the first movable contact away from the contact support; the second fixed contact is arranged on one side of the second moving contact far away from the contact support.

4. The alarm contact as claimed in claim 3, wherein the contact support is a plate-shaped structure, a first protrusion and a second protrusion are disposed on a first side of the plate-shaped structure, the first protrusion is configured to push the first movable contact toward the first fixed contact, the second protrusion is configured to push the second movable contact toward the second fixed contact, and the first movable contact and the second movable contact are both located between the first side and one of the inner walls of the housing;

the first side surface is one surface in the thickness direction of the plate-shaped structure.

5. The alarm contact as in claim 4, wherein the first side further defines a third protrusion and a fourth protrusion, the first movable contact is at least partially disposed between the first protrusion and the third protrusion, and the second movable contact is at least partially disposed between the second protrusion and the fourth protrusion;

the third bulge is used for pushing the first moving contact to move in a direction away from the first fixed contact in the process that the contact supports jumping from the first position to the second position; the fourth bulge is used for pushing the second moving contact to move in a direction far away from the second fixed contact in the process that the contact support jumps from the second position to the first position.

6. The alarming contact as recited in claim 1, wherein a first moving silver point is disposed on the first moving contact, a first static silver point is disposed on the first static contact, a convex portion is disposed on at least one of the first static silver point and the first moving silver point, and the first static silver point and the first moving silver point are in contact via the convex portion.

7. The alarm contact according to claim 6, wherein the convex portion is an elongated protrusion; when the first static silver point and the first movable silver point are respectively provided with the convex parts, the convex parts on the first movable silver point and the convex parts on the first static silver point have a non-zero included angle in the space.

8. The alarm contact according to claim 1, further comprising:

the stopping table is arranged on a handle of the alarm contact, the stopping table rotates along with the handle in the opening and closing processes of the alarm contact to form a first rotating track, and one side, far away from the contact support, of the first rotating track is a limiting area;

the limiting part is arranged on the contact support and moves along with the contact support, when the contact support is positioned at the first position, the limiting part is positioned in the limiting area, and when the contact support is positioned at the second position, the limiting part is not positioned in the limiting area;

the supporting piece is arranged on one side supported by the contact, swings along with the opening and closing of the alarm contact, and is linked with an operating mechanism of the circuit breaker;

a reset member having one end connected to the housing and the other end connected to the contact support, the reset member having a tendency to cause the contact support to jump from the first position to the second position;

when the alarm contact is switched off under the buckling state of the operating mechanism of the circuit breaker, the stop table is positioned on the motion path of the limiting part so as to limit the limiting part in the limiting area, when the alarm contact is switched on, the stop table is not positioned on the motion path of the limiting part, and the contact support is abutted by the support piece so that the limiting part is positioned in the limiting area;

and when the operating mechanism of the circuit breaker is in a tripping state, the supporting piece is separated from the contact support, so that the contact support jumps to the second position under the elastic force of the resetting piece.

9. The alarm contact according to claim 8, wherein the contact support is provided with a first mating portion and the support is provided with a second mating portion;

after the operating mechanism of the circuit breaker is tripped and buckled again, the second matching part is used for being abutted against the first matching part in the first closing process of the alarm contact to push the contact support to jump from the second position to the first position.

10. The alarm contact according to claim 9, wherein the contact support is provided with a kidney-shaped hole, the support member is provided with a convex pillar near one side of the contact support, the first mating portion is configured as a hole wall of the kidney-shaped hole, and the second mating portion is configured as the convex pillar; or,

a convex column is arranged on one side, close to the support piece, of the contact support, a kidney-shaped hole is formed in the support piece, the first matching portion is configured to be the convex column, and the second matching portion is configured to be the hole wall of the kidney-shaped hole;

when the contact support is located at the first position, the support piece swings along with the opening and closing of the alarm contact, and the convex column moves in the waist-shaped hole.

11. A circuit-breaking device with an alarm contact, characterized in that it comprises a circuit-breaker and an alarm contact according to any one of claims 1-10, said circuit-breaker being assembled with said alarm contact.

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