Electromagnetic tripping device and electrical device

Abstract

The invention discloses an electromagnetic tripping device, characterized in that, comprises a breaking unit and a tripping unit. The breaking unit comprises a breaking unit housing, a static contact conducting bar fixed on the breaking unit housing and extending out of the breaking unit housing in a first direction, a trip-actuating member configured to be triggerable to cause the breaking unit to complete a tripping action. The tripping unit comprises a tripping unit housing, a trigger member being movably mounted on the tripping unit housing relative to the tripping unit housing. The tripping unit is detachably mounted as a whole to the breaking unit, and in a state where the tripping unit is mounted to the breaking unit, the trigger member moves relative to the tripping unit housing to trigger the trip-actuating member when a current flowing through the static contact conducting bar exceeds a threshold.

Description

TECHNICAL FIELD

[0001] The invention relates to the electric field, in particular to an electromagnetic tripping device and an electric device comprising the electromagnetic tripping device.BACKGROUND

[0002] The electromagnetic tripping device of circuit breaker is generally composed of armature, yoke, traction rod, adjusting device, striking rod, driving spring for striking rod and meniscus. In the prior art, the loaded copper bars of some electromagnetic tripping devices are connected with the static contacts through screws. When the current passing through the loaded copper bars reaches the set current, the yoke attracts the armature to act, which strikes the traction rod and moves it. The movement of the traction rod causes the spring of the striking rod to be biased. The spring energy release causes the striking rod to hit the meniscus to move, which in turn causes the mechanism to complete the tripping action. This kind of electromagnetic tripping device has mature technology and good reliability, but its volume is relatively large, its parts are complicated and its cost is relatively high. The most important thing is that the tripping action is completed by releasing the elastic potential energy of the spring through the electromagnetic mechanism, which takes a certain time, which will delay the tripping action, and the tripping speed is mainly determined by the release speed of the spring potential energy, so it is impossible to adjust the tripping speed.

[0003] In the prior art, there are some devices that are directly driven by electromagnets to realize tripping, and they are provided with bias springs that can adjust the tripping force, but the replacement of the bias springs is troublesome. Multiple components need to be disassembled at the same time to realize replacement. These devices include many components, and these components need to meet a certain mating relationship and mating accuracy, which is inconvenient to install and has poor maintainability. In addition, some components are not well positioned, which may affect the attraction stability of electromagnets, which brings security risks.

[0004] Therefore, an electromagnetic tripping device which is easy to install is needed to solve these problems.SUMMARY

[0005] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure provides an electromagnetic tripping device, characterized in that, comprises a breaking unit and a tripping unit. The breaking unit comprises a breaking unit housing, a static contact conducting bar fixed on the breaking unit housing and extending out of the breaking unit housing in a first direction, a trip-actuating member configured to be triggerable to cause the breaking unit to complete a tripping action. The tripping unit comprises a tripping unit housing, a trigger member being movably mounted on the tripping unit housing relative to the tripping unit housing. The tripping unit is detachably mounted as a whole to the breaking unit, and in a state where the tripping unit is mounted to the breaking unit, the trigger member moves relative to the tripping unit housing to trigger the trip-actuating member when a current flowing through the static contact conducting bar exceeds a threshold.

[0006] For example, according to some embodiments of the present disclosure, the tripping unit further comprises an armature arranged to be movable between a first position and a second position in a second direction relative to the tripping unit housing, and a pull rod arranged to extend in a second direction, the pull rod having a first end and a second end, the first end being connected with the armature to move in the second direction relative to the tripping unit housing together with the armature, and the second end of the pull rod being fitted with the trigger member such that the movement of the pull rod from the first position to the second position causes the trigger member to perform a pivoting motion.

[0007] In the state that the tripping unit is installed to the breaking unit, the second position is closer to the static contact conducting bar than the first position, the pivoting motion of the trigger member can trigger the trip-actuating member, and when the current flowing through the static contact conducting bar exceeds the threshold, the armature can move to the second position in the second direction towards the static contact conducting bar.

[0008] For example, according to some embodiments of the present disclosure, the static contact conducting bar is fixed on the breaking unit housing and has an extension segment and an external connection segment extending in the first direction, and the external connection segment being located at the free end of the static contact conducting bar.

[0009] The breaking unit further comprises a yoke, the yoke being fixed on the breaking unit housing adjacent to the extension segment, in the state that the tripping unit is installed to the breaking unit, the second direction being perpendicular to the first direction, and the external connection segment extending out of the breaking unit housing and the tripping unit housing.

[0010] The yoke attracting the armature to move to the second position along the second direction toward the extension segment when the current flows through the static contact conducting bar exceeds the threshold.

[0011] For example, according to some embodiments of the present disclosure, the tripping unit further comprises a reset spring detachably mounted to the tripping unit housing, and the reset spring biases the armature to the first position.

[0012] For example, according to some embodiments of the present disclosure, the reset spring is a torsion spring, one end of the reset spring being connected with the pull rod. The tripping unit housing comprises a plurality of accommodation portions, the other end of the reset spring extending into one of the plurality of accommodation portions, wherein extending into different accommodation portions causes the reset spring to have different degrees of pre-deformation.

[0013] For example, according to some embodiments of the present disclosure, the tripping unit further comprises a guide groove extending in the second direction, and the pull rod comprises a tab extending into the guide groove, such that the pull rod moves along the guide groove in a second direction.

[0014] For example, according to some embodiments of the present disclosure, the yoke comprises a first section, a second section, and a connecting section connecting the first section and the second section, and has a U-shaped structure, an opening of the U-shaped structure faces the armature, and the extension segment being arranged between the first section and the second section.

[0015] For example, according to some embodiments of the present disclosure, the tripping unit housing also comprises guiding portion, which comprises two first surfaces perpendicular to a third direction and facing each other, and two second surfaces perpendicular to the third direction and facing away from each other. Planes where the two first surfaces are located being positioned between the planes where the two second surfaces are located. The third direction is perpendicular to the first direction and the second direction. The armature moves in the second direction between the two opposite first surfaces. The two second surfaces are located in the first section and the second section of the yoke and respectively abut against the first section and the second section of the yoke in the third direction.

[0016] For example, according to some embodiments of the present disclosure, the electromagnetic tripping device comprises a plurality of breaking units.

[0017] For example, according to some embodiments of the present disclosure, the tripping unit comprises two sets of armatures, a pull rod, a reset spring and a trigger member, wherein all the trigger share one pivot shaft to pivot synchronously.

[0018] The present disclosure also provides an electrical device, comprising the electromagnetic tripping device according to any one of the above contents.BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 shows a schematic sectional plan view of an electromagnetic tripping device according to an embodiment of the present disclosure; Figs. 2a and 2b show schematic perspective views of a tripping unit according to an embodiment of the present disclosure, wherein Fig. 2a is a complete schematic perspective view of the tripping unit, and for convenience of display, a part of the tripping unit housing is cut away to show its interior structure in Fig. 2b. Figs. 3a and 3b are schematic diagrams showing the mating relationship of the tripping unit in Figs. 2a and 2b with the static contact conducting bar and the yoke, and for convenience of display, the tripping unit housing is partially cut away to leak its interior structure in Fig. 3a, and Fig. 3b is a plan view and the guiding portion is sectioned for showing. Fig. 4 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit in Figs. 2a and 2b; Fig. 5 shows a schematic perspective view of a tripping unit according to another embodiment of the present disclosure; Fig. 6 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit in Fig. 5. DETAILED DESCRIPTION

[0020] In order to make the purpose, scheme, and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiment of the present disclosure will be described clearly and completely with the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meaning in the art.. Like reference numerals in the drawings represent like components.

[0021] In the description of this disclosure, it should be noted that unless otherwise specified and limited, the terms "instal", "link" and "connect" should be broadly understood, for example, they can be fixed connection, detachable connection or integrated connection; It can be a mechanical connection or an electrical connection; Can be directly connected, can also be indirectly connected through an intermediate medium, and can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood in specific situations.

[0022] For convenience of explanation, in this disclosure, the direction in which the static contact conducting bar extends out of the breaking unit housing is designated as the first direction, the movement direction of the pull rod is designated as the second direction, and the direction perpendicular to the first direction and the second direction is designated as the third direction. The first direction D1, the second direction D2, and the third direction D3 are shown by arrows in Figs. 2a and 3a.

[0023] According to an embodiment of the present disclosure, as shown in combination with Figs. 1 and 4, an electromagnetic tripping device may include a tripping unit 1 and a tripping unit 2, and the tripping unit 2 is detachably mounted as a whole to the tripping unit 1. In particular, the breaking unit 1 may include a breaking unit housing 11, a static contact conducting bar 12, a trip-actuating member 13 and a yoke 14, while the tripping unit 2 may include a tripping unit housing 21, an armature 22, a pull rod 23, a reset spring 25, a trigger member 24, a plurality of accommodation portions 26 and a guiding portion 29. The tripping unit 2 integrated with the above components can be disassembled and replaced from the breaking unit as a single module unit. In particular, the tripping unit 2 and the breaking unit 1 can be detachably installed by means of buckle and screw connection.

[0024] In addition, the installation of multiple components in the whole electromagnetic tripping device can be realized by only installing the tripping unit 2, and the relative positions of multiple components can meet the functional requirements, thus greatly reducing the assembly process and preventing the tripping instability caused by possible assembly dislocation. In particular, the most suitable tripping unit can be selected or replaced for specific application scenarios, for example, the tripping unit with the most suitable tripping force can be selected according to the required tripping current, without the need for custom assembly and design of the whole device.

[0025] Specifically, as shown in Figs. 1 and 3a, the static contact conducting bar 12 can be made of metals such as copper, aluminum, iron or other alloys, which are fixed on the breaking unit housing 11 and have an extension segment 121 and an external connection segment 122 extending in the first direction D1. The external connection segment 122 is located at the free end of the static contact conducting bar 12 and extends out of the breaking unit housing 11 and the tripping unit housing 21 for externally connecting to power supply. In addition, the extension segment 121 and the external connection segment 122 may be adjacent. When the electromagnetic tripping device is connected to a circuit and the circuit is turned on, a current flow through the static contact conducting bar 12.

[0026] The yoke 14 can be fixed on the breaking unit housing 11 adjacent to the extension segment 121 of the static contact conductor bar 12. As shown in Figs. 1 and 3a, the yoke 14 can have a U-shaped structure, specifically, it can include, for example, a first section 141, a second section 142, and a connecting section 33 connecting the first section 141 and the second section 142. The first section 141 and the second section 142 are opposite in the third direction. The opening of the U-shaped structure may face the armature 22 (which will be described in detail later), and the extension segment 121 may be arranged between the first section 141 and the second section 142. In particular, the extension segment 121 may be adjacent to the connection section 33. This arrangement makes it possible for the yoke 2 to induce a magnetic field which can act on the armature to realize the function of causing the armature to move, when a current flow through the static contact conducting bar 12.

[0027] As shown in Fig. 1, the trip-actuating member 13 can be, for example, a meniscus, which is configured to be triggered, for example, to make the breaking unit 1 complete the tripping action via more transmission members (not shown), that is, to separate the moving contact and the static contact (not shown) in the breaking unit from each other, thereby electrically insulating the breaking unit 1.

[0028] Referring to Figs. 2a to 3a, the armature 22 may be arranged to move in the second direction D2 relative to the tripping unit housing 21 to switch between the first position and the second position. In the state that the tripping unit 2 is installed in the breaking unit 1, the armature 22 can be arranged on the side of the extension segment 121 of the static contact conducting bar 12 far from the connecting end 33, and is movable towards or away from the extension segment 121 in the second direction D2, wherein the farthest position of the armature 22 from the extension segment 121 is the first position, and the nearest position of the armature 22 from the extension segment 121 is the second position. The armature 22 can be biased in a first position (which will be described in detail later) by a reset spring 25, and the magnetic field induced by the yoke 2 can attract the armature 22 to move to a second position along the second direction D2 toward the extension segment 121 when the current flowing through the static contact bus 12 exceeds a threshold value (i.e., corresponding to a short-circuit condition and / or an overload condition).

[0029] Further, the armature 22 can be arranged between the first section 141 and the second section 142 in the third direction D3, especially the first position of the armature 22 can be arranged between the first section 141 and the second section 142, such that the structure of the electromagnetic tripping device is more compact. Closer proximity of the armature 22 to the yoke 14 results in a greater magnetic force exerted on the armature 22 and a faster movement of the armature 22 from the first position to the second position. In particular, the two opposite faces of the first section 141 and the second section 142 are perpendicular to the third direction D3, and the two side faces of the armature 22 are also perpendicular to the third direction D3.

[0030] Referring to Figs. 2a to 3a, the pull rod 23 extends in the second direction D2 and can move in the second direction D1. The pull rod 23 has a first end 231 and a second end 232, and the first end 231 is connected with the armature 22, such as but not limited to, for example, screw connection, welding, riveting and other connection methods, such that the pull rod 23 can move together with the armature 22.

[0031] Referring to Figs. 2a to 3a, the trigger member 24 is pivotally mounted to the tripping unit housing 21, and the trigger member 24 can be fitted with the second end 232 of the pull rod 23, which can be any fit that can be thought of by those skilled in the art, such as but not limited to keyway fit, hinge fit, cam slider fit and insertion fit of concave and convex portions as shown in Figs. 2a to 3a, etc., such that the movement of the pull rod 23 in the second direction D2 can cause the trigger member 24 to perform a pivoting motion. In particular, the movement of the pull rod 23 in the second direction D2 towards the extension segment 121 of the static contact conducting bar 2 driven by the armature 22 can cause the trigger member 24 to perform a pivoting motion in a specific pivot direction (for example, counterclockwise in Fig. 3a) towards the trip-actuating member 13 so as to contact the trip-actuating member 13 and trigger the trip-actuating member 13 (e.g., a meniscus), which in turn triggers the breaking unit to complete the tripping action, i.e., the breaking action of the movable contact and the static contact.

[0032] The structure of the moving components involved in the magnetic tripping action and the cooperation relationship between the moving components are described above. The armature 22 is acted by electromagnetic force to overcome the biasing force of the reset spring 25 to complete the tripping when short-circuit current or overload occurs. By arranging the static contact conducting bar 12, the trip-actuating member 13 and the yoke 14 in the breaking unit 1, and simultaneously arranging the armature 22, the pull rod 23 and the trigger member 24 in the tripping unit 2, the modularized arrangement of the electromagnetic tripping device is realized. Therefore, the installation of a plurality of components in the whole electromagnetic tripping device can be realized by only installing the tripping unit 2, and the relative positions of the components can meet the functional requirements, thus greatly reducing the assembly process and preventing the tripping instability caused by possible assembly dislocation.

[0033] Further, as shown in Figs. 2a to 3a, the tripping unit may further include a reset spring 25 which can bias the armature 22 in the first position, for example, the reset spring 25 may have a pre-deformation amount to directly bias the armature 22 or indirectly bias the armature 4 in the first position via the pull rod 5, so as to ensure that the armature 4 remains in the first position when the current is lower than the threshold, and when the current is greater than the threshold, the armature 22 can move to the second position against the bias of the reset spring 25, and it is able to automatically reset at the end of this movement process. Preferably, the reset spring 6 is compressed and biased, which is beneficial to saving space and making the structure more compact.

[0034] Further, the reset spring 25 is detachably mounted to the tripping unit housing 21, and in particular, the reset spring 25 is a torsion spring, which comprises a circular ring section and free ends at both ends of the circular ring section, and the circular ring section is sleeved on the support column 27 of the tripping unit 2. The support column 27 extends perpendicular to the second direction D2 and has a free end at one end, as shown in Fig. 2b, such that the reset spring 25 can be detached from the support column 27 for convenient replacement.

[0035] Further, one end of the reset spring 25 is coupled to (for example, abuts against) the pull rod 23, as shown in Figs. 2b and 3b. The other end may be coupled to the tripping unit housing 21, for example, accommodated in the accommodation portions 26 of the tripping unit housing 21. The tripping unit housing 21 may include a plurality of accommodation portions 26, as shown in Figs. 2a-3b. For example, the plurality of accommodation portions 26 are arranged in the second direction D2, and the other end of the reset spring 25 extends into one of the pluralities of accommodation portions 26. Extending into different accommodation portions causes the reset spring to have different degrees of pre-deformation. Therefore, the resistance needed to overcome the magnetic tripping action can be adjusted according to different models and different application scenarios, such that the electromagnetic tripping device can be used in various scenarios. The targeted adjustment makes the tripping more stable and reliable, and meets different requirements.

[0036] Further, the tripping unit 2 may further include a guide groove 28 extending along the second direction D2, and in particular, for example, has two guide grooves 28, as shown in Fig. 2a. The pull rod 23 comprises a tab 233 extending into the guide groove 28, as shown in Fig. 2b (in which, for convenience of illustration, a part of the tripping unit housing is cut away to show its interior structure), such that the pull rod 23 can move along the guide groove 28 in the second direction D2.

[0037] When short-circuit current or overload occurs, the armature 22 is acted by electromagnetic force to overcome the biasing force of the reset spring 25 to complete tripping. However, in order to ensure that the armature 22 is reliably sucked into the yoke 14, a certain gap needs to be set between the armature 22 and the yoke 14 in the third direction D3, which makes it very important to guide the armature 22 during the movement and accurately position it relative to the yoke 14, so as to avoid the tripping failure caused by the collision with the yoke 14 during the movement.

[0038] To this end, the tripping unit housing 21 may further include a guiding portion 29, as shown in Figs. 2a and 2b, the guiding portion 29 may include two first surfaces 291 (only one is shown in Fig. 2b) perpendicular to the third direction D3 and facing each other, and two second surfaces 292 (only one is shown in Figs. 2a and 2b) perpendicular to the third direction D3 and facing away from each other. The planes where the two first surfaces291 are located being positioned between the planes where the two second surfaces 292 are located, as shown in Figs. 3a and 3b. Thus, the armature 22 can move in the second direction D2 between the two opposite first surfaces 291, as shown in Fig. 3b. The two second surfaces 292 are located between the first section 141 and the second section 142 of the yoke 14, and the two second surfaces 292abut against the first section 141 and the second section 142 of the yoke 14 in the third direction D3, respectively, as shown in Figs. 3a and 3b.

[0039] As shown in Figs. 3a and 3b, the distance between the first section 141 and the second section 142 of the yoke 14 is greater than the width of the armature 22. After the tripping unit 2 is installed on the breaking unit 1, the position of the yoke 14 in the third direction D3 will be defined by the second surface 292, and the position of the armature 22 in the third direction D3 will be defined by the first surface 291. The positions of the yoke 14 and the armature 22 in the third direction D3 are defined by the guiding portion 29, and the first surface 291 and the second surface 292 are spaced apart in the third direction D3 (it is difficult to show in Fig. 3b because the gap is too small, but those skilled in the art can understand), such that a reliable gap can be ensured between the yoke 14 and the armature 22 in the third direction D3.

[0040] The present disclosure realizes reliable guidance of the armature 22 during the movement through the mating relationship between the guiding portion 29 of the tripping unit 2 and the armature 22 and the yoke 14 respectively. The armature 22 and the yoke 14 are guaranteed not to collide in the movement through the first surface 291 and the second surface 292 spaced apart in the third direction D3, such that there is no need for components processing and assembly with too high precision requirements, and the structure is simple, which is beneficial to reducing the cost.

[0041] Fig. 4 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit 2 in Figs. 2a and 2b. The electromagnetic tripping device may include a plurality of breaking units 1, for example, 2 (as shown in Fig. 4), 3, 4, etc. Each breaking unit 1 can be provided with a corresponding tripping unit 2.

[0042] Further, the present disclosure also proposes another embodiment of the tripping unit 2, as shown in Fig. 5, that is, the tripping unit 2 with a plurality of sets comprising the combination of the armature 22, the pull rod 23, the reset spring 25 and the trigger member 24, for example, two sets as shown in Fig. 5, or three sets, four sets, etc. The structure and mating relationship of the armature 22, the pull rod 23, the reset spring 25 and the trigger member 24 in each combination set are the same as those described above in connection with Figs. 2a- 3b. In particular, all the trigger members 24 may share a pivot shaft to pivot synchronously, as shown in Fig. 5.

[0043] Fig. 6 shows an electromagnetic tripping device comprising four breaking units 1, and every two adjacent breaking units 1 are provided with a tripping unit 2 as shown in Fig. 5.

[0044] The present disclosure also proposes an electrical device, such as a contactor or a circuit breaker, comprising the electromagnetic tripping device according to the present disclosure.

[0045] It should be understood that the above description is intended to be illustrative rather than limiting. For example, the above embodiments (and / or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of this disclosure without departing from its scope. The functions or performances of various elements or modules described herein are only for illustration and are in no way restrictive, but only exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art after reading the above description. Therefore, the scope of the present disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

[0046] In the appended claims, the terms "comprising" and "in which" are used as simple English equivalents of the corresponding terms "comprising" and "in which". In addition, in the following claims, the terms "first", "second" and "third" are only used as labels, and no numerical requirements are intended to be imposed on their objects.List of reference numerals:

[0047] 1 breaking unit, 11 breaking unit housing, 12 static contact conducting bar, 121 extension segment, 122 external connection segment, 13 trip-actuating member, 14 yoke, 141 first section, 142 second section, 143 third section, 2 tripping unit, 21 tripping unit housing, 22 armature, 23 pull rod, 231 first end, 232 second end, 233 tab, 24 trigger member, 25 reset spring, 26 accommodation portion, 27 support column, 28 guide groove, 29 guiding portion, 291 first surface, 292 second surface, D1 first direction, D2 second direction, D3 third direction

Examples

Embodiment Construction

[0020]In order to make the purpose, scheme, and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiment of the present disclosure will be described clearly and completely with the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meaning in the art.. Like reference numerals in the drawings represent like components.

[0021]In the description of this disclosure, it should be noted that unless otherwise specified and limited, the terms "instal", "link" and "connect" should be broadly understood, for example, they can be fixed connection, detachable connection or integrated connection; It can be a mechanical connection or an electrical connection; Can be directly connected, can also be indirectly connected through an intermediate medium, and can be connected inside two elements. For those skilled in the art, the specific meanings of the above ter...

TECHNICAL FIELD

[0001] The invention relates to the electric field, in particular to an electromagnetic tripping device and an electric device comprising the electromagnetic tripping device.BACKGROUND

[0002] The electromagnetic tripping device of circuit breaker is generally composed of armature, yoke, traction rod, adjusting device, striking rod, driving spring for striking rod and meniscus. In the prior art, the loaded copper bars of some electromagnetic tripping devices are connected with the static contacts through screws. When the current passing through the loaded copper bars reaches the set current, the yoke attracts the armature to act, which strikes the traction rod and moves it. The movement of the traction rod causes the spring of the striking rod to be biased. The spring energy release causes the striking rod to hit the meniscus to move, which in turn causes the mechanism to complete the tripping action. This kind of electromagnetic tripping device has mature technology and good reliability, but its volume is relatively large, its parts are complicated and its cost is relatively high. The most important thing is that the tripping action is completed by releasing the elastic potential energy of the spring through the electromagnetic mechanism, which takes a certain time, which will delay the tripping action, and the tripping speed is mainly determined by the release speed of the spring potential energy, so it is impossible to adjust the tripping speed.

[0003] In the prior art, there are some devices that are directly driven by electromagnets to realize tripping, and they are provided with bias springs that can adjust the tripping force, but the replacement of the bias springs is troublesome. Multiple components need to be disassembled at the same time to realize replacement. These devices include many components, and these components need to meet a certain mating relationship and mating accuracy, which is inconvenient to install and has poor maintainability. In addition, some components are not well positioned, which may affect the attraction stability of electromagnets, which brings security risks.

[0004] Therefore, an electromagnetic tripping device which is easy to install is needed to solve these problems.SUMMARY

[0005] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure provides an electromagnetic tripping device, characterized in that, comprises a breaking unit and a tripping unit. The breaking unit comprises a breaking unit housing, a static contact conducting bar fixed on the breaking unit housing and extending out of the breaking unit housing in a first direction, a trip-actuating member configured to be triggerable to cause the breaking unit to complete a tripping action. The tripping unit comprises a tripping unit housing, a trigger member being movably mounted on the tripping unit housing relative to the tripping unit housing. The tripping unit is detachably mounted as a whole to the breaking unit, and in a state where the tripping unit is mounted to the breaking unit, the trigger member moves relative to the tripping unit housing to trigger the trip-actuating member when a current flowing through the static contact conducting bar exceeds a threshold.

[0006] For example, according to some embodiments of the present disclosure, the tripping unit further comprises an armature arranged to be movable between a first position and a second position in a second direction relative to the tripping unit housing, and a pull rod arranged to extend in a second direction, the pull rod having a first end and a second end, the first end being connected with the armature to move in the second direction relative to the tripping unit housing together with the armature, and the second end of the pull rod being fitted with the trigger member such that the movement of the pull rod from the first position to the second position causes the trigger member to perform a pivoting motion.

[0007] In the state that the tripping unit is installed to the breaking unit, the second position is closer to the static contact conducting bar than the first position, the pivoting motion of the trigger member can trigger the trip-actuating member, and when the current flowing through the static contact conducting bar exceeds the threshold, the armature can move to the second position in the second direction towards the static contact conducting bar.

[0008] For example, according to some embodiments of the present disclosure, the static contact conducting bar is fixed on the breaking unit housing and has an extension segment and an external connection segment extending in the first direction, and the external connection segment being located at the free end of the static contact conducting bar.

[0009] The breaking unit further comprises a yoke, the yoke being fixed on the breaking unit housing adjacent to the extension segment, in the state that the tripping unit is installed to the breaking unit, the second direction being perpendicular to the first direction, and the external connection segment extending out of the breaking unit housing and the tripping unit housing.

[0010] The yoke attracting the armature to move to the second position along the second direction toward the extension segment when the current flows through the static contact conducting bar exceeds the threshold.

[0011] For example, according to some embodiments of the present disclosure, the tripping unit further comprises a reset spring detachably mounted to the tripping unit housing, and the reset spring biases the armature to the first position.

[0012] For example, according to some embodiments of the present disclosure, the reset spring is a torsion spring, one end of the reset spring being connected with the pull rod. The tripping unit housing comprises a plurality of accommodation portions, the other end of the reset spring extending into one of the plurality of accommodation portions, wherein extending into different accommodation portions causes the reset spring to have different degrees of pre-deformation.

[0013] For example, according to some embodiments of the present disclosure, the tripping unit further comprises a guide groove extending in the second direction, and the pull rod comprises a tab extending into the guide groove, such that the pull rod moves along the guide groove in a second direction.

[0014] For example, according to some embodiments of the present disclosure, the yoke comprises a first section, a second section, and a connecting section connecting the first section and the second section, and has a U-shaped structure, an opening of the U-shaped structure faces the armature, and the extension segment being arranged between the first section and the second section.

[0015] For example, according to some embodiments of the present disclosure, the tripping unit housing also comprises guiding portion, which comprises two first surfaces perpendicular to a third direction and facing each other, and two second surfaces perpendicular to the third direction and facing away from each other. Planes where the two first surfaces are located being positioned between the planes where the two second surfaces are located. The third direction is perpendicular to the first direction and the second direction. The armature moves in the second direction between the two opposite first surfaces. The two second surfaces are located in the first section and the second section of the yoke and respectively abut against the first section and the second section of the yoke in the third direction.

[0016] For example, according to some embodiments of the present disclosure, the electromagnetic tripping device comprises a plurality of breaking units.

[0017] For example, according to some embodiments of the present disclosure, the tripping unit comprises two sets of armatures, a pull rod, a reset spring and a trigger member, wherein all the trigger share one pivot shaft to pivot synchronously.

[0018] The present disclosure also provides an electrical device, comprising the electromagnetic tripping device according to any one of the above contents.BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 shows a schematic sectional plan view of an electromagnetic tripping device according to an embodiment of the present disclosure; Figs. 2a and 2b show schematic perspective views of a tripping unit according to an embodiment of the present disclosure, wherein Fig. 2a is a complete schematic perspective view of the tripping unit, and for convenience of display, a part of the tripping unit housing is cut away to show its interior structure in Fig. 2b. Figs. 3a and 3b are schematic diagrams showing the mating relationship of the tripping unit in Figs. 2a and 2b with the static contact conducting bar and the yoke, and for convenience of display, the tripping unit housing is partially cut away to leak its interior structure in Fig. 3a, and Fig. 3b is a plan view and the guiding portion is sectioned for showing. Fig. 4 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit in Figs. 2a and 2b; Fig. 5 shows a schematic perspective view of a tripping unit according to another embodiment of the present disclosure; Fig. 6 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit in Fig. 5. DETAILED DESCRIPTION

[0020] In order to make the purpose, scheme, and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiment of the present disclosure will be described clearly and completely with the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meaning in the art.. Like reference numerals in the drawings represent like components.

[0021] In the description of this disclosure, it should be noted that unless otherwise specified and limited, the terms "instal", "link" and "connect" should be broadly understood, for example, they can be fixed connection, detachable connection or integrated connection; It can be a mechanical connection or an electrical connection; Can be directly connected, can also be indirectly connected through an intermediate medium, and can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood in specific situations.

[0022] For convenience of explanation, in this disclosure, the direction in which the static contact conducting bar extends out of the breaking unit housing is designated as the first direction, the movement direction of the pull rod is designated as the second direction, and the direction perpendicular to the first direction and the second direction is designated as the third direction. The first direction D1, the second direction D2, and the third direction D3 are shown by arrows in Figs. 2a and 3a.

[0023] According to an embodiment of the present disclosure, as shown in combination with Figs. 1 and 4, an electromagnetic tripping device may include a tripping unit 1 and a tripping unit 2, and the tripping unit 2 is detachably mounted as a whole to the tripping unit 1. In particular, the breaking unit 1 may include a breaking unit housing 11, a static contact conducting bar 12, a trip-actuating member 13 and a yoke 14, while the tripping unit 2 may include a tripping unit housing 21, an armature 22, a pull rod 23, a reset spring 25, a trigger member 24, a plurality of accommodation portions 26 and a guiding portion 29. The tripping unit 2 integrated with the above components can be disassembled and replaced from the breaking unit as a single module unit. In particular, the tripping unit 2 and the breaking unit 1 can be detachably installed by means of buckle and screw connection.

[0024] In addition, the installation of multiple components in the whole electromagnetic tripping device can be realized by only installing the tripping unit 2, and the relative positions of multiple components can meet the functional requirements, thus greatly reducing the assembly process and preventing the tripping instability caused by possible assembly dislocation. In particular, the most suitable tripping unit can be selected or replaced for specific application scenarios, for example, the tripping unit with the most suitable tripping force can be selected according to the required tripping current, without the need for custom assembly and design of the whole device.

[0025] Specifically, as shown in Figs. 1 and 3a, the static contact conducting bar 12 can be made of metals such as copper, aluminum, iron or other alloys, which are fixed on the breaking unit housing 11 and have an extension segment 121 and an external connection segment 122 extending in the first direction D1. The external connection segment 122 is located at the free end of the static contact conducting bar 12 and extends out of the breaking unit housing 11 and the tripping unit housing 21 for externally connecting to power supply. In addition, the extension segment 121 and the external connection segment 122 may be adjacent. When the electromagnetic tripping device is connected to a circuit and the circuit is turned on, a current flow through the static contact conducting bar 12.

[0026] The yoke 14 can be fixed on the breaking unit housing 11 adjacent to the extension segment 121 of the static contact conductor bar 12. As shown in Figs. 1 and 3a, the yoke 14 can have a U-shaped structure, specifically, it can include, for example, a first section 141, a second section 142, and a connecting section 33 connecting the first section 141 and the second section 142. The first section 141 and the second section 142 are opposite in the third direction. The opening of the U-shaped structure may face the armature 22 (which will be described in detail later), and the extension segment 121 may be arranged between the first section 141 and the second section 142. In particular, the extension segment 121 may be adjacent to the connection section 33. This arrangement makes it possible for the yoke 2 to induce a magnetic field which can act on the armature to realize the function of causing the armature to move, when a current flow through the static contact conducting bar 12.

[0027] As shown in Fig. 1, the trip-actuating member 13 can be, for example, a meniscus, which is configured to be triggered, for example, to make the breaking unit 1 complete the tripping action via more transmission members (not shown), that is, to separate the moving contact and the static contact (not shown) in the breaking unit from each other, thereby electrically insulating the breaking unit 1.

[0028] Referring to Figs. 2a to 3a, the armature 22 may be arranged to move in the second direction D2 relative to the tripping unit housing 21 to switch between the first position and the second position. In the state that the tripping unit 2 is installed in the breaking unit 1, the armature 22 can be arranged on the side of the extension segment 121 of the static contact conducting bar 12 far from the connecting end 33, and is movable towards or away from the extension segment 121 in the second direction D2, wherein the farthest position of the armature 22 from the extension segment 121 is the first position, and the nearest position of the armature 22 from the extension segment 121 is the second position. The armature 22 can be biased in a first position (which will be described in detail later) by a reset spring 25, and the magnetic field induced by the yoke 2 can attract the armature 22 to move to a second position along the second direction D2 toward the extension segment 121 when the current flowing through the static contact bus 12 exceeds a threshold value (i.e., corresponding to a short-circuit condition and / or an overload condition).

[0029] Further, the armature 22 can be arranged between the first section 141 and the second section 142 in the third direction D3, especially the first position of the armature 22 can be arranged between the first section 141 and the second section 142, such that the structure of the electromagnetic tripping device is more compact. Closer proximity of the armature 22 to the yoke 14 results in a greater magnetic force exerted on the armature 22 and a faster movement of the armature 22 from the first position to the second position. In particular, the two opposite faces of the first section 141 and the second section 142 are perpendicular to the third direction D3, and the two side faces of the armature 22 are also perpendicular to the third direction D3.

[0030] Referring to Figs. 2a to 3a, the pull rod 23 extends in the second direction D2 and can move in the second direction D1. The pull rod 23 has a first end 231 and a second end 232, and the first end 231 is connected with the armature 22, such as but not limited to, for example, screw connection, welding, riveting and other connection methods, such that the pull rod 23 can move together with the armature 22.

[0031] Referring to Figs. 2a to 3a, the trigger member 24 is pivotally mounted to the tripping unit housing 21, and the trigger member 24 can be fitted with the second end 232 of the pull rod 23, which can be any fit that can be thought of by those skilled in the art, such as but not limited to keyway fit, hinge fit, cam slider fit and insertion fit of concave and convex portions as shown in Figs. 2a to 3a, etc., such that the movement of the pull rod 23 in the second direction D2 can cause the trigger member 24 to perform a pivoting motion. In particular, the movement of the pull rod 23 in the second direction D2 towards the extension segment 121 of the static contact conducting bar 2 driven by the armature 22 can cause the trigger member 24 to perform a pivoting motion in a specific pivot direction (for example, counterclockwise in Fig. 3a) towards the trip-actuating member 13 so as to contact the trip-actuating member 13 and trigger the trip-actuating member 13 (e.g., a meniscus), which in turn triggers the breaking unit to complete the tripping action, i.e., the breaking action of the movable contact and the static contact.

[0032] The structure of the moving components involved in the magnetic tripping action and the cooperation relationship between the moving components are described above. The armature 22 is acted by electromagnetic force to overcome the biasing force of the reset spring 25 to complete the tripping when short-circuit current or overload occurs. By arranging the static contact conducting bar 12, the trip-actuating member 13 and the yoke 14 in the breaking unit 1, and simultaneously arranging the armature 22, the pull rod 23 and the trigger member 24 in the tripping unit 2, the modularized arrangement of the electromagnetic tripping device is realized. Therefore, the installation of a plurality of components in the whole electromagnetic tripping device can be realized by only installing the tripping unit 2, and the relative positions of the components can meet the functional requirements, thus greatly reducing the assembly process and preventing the tripping instability caused by possible assembly dislocation.

[0033] Further, as shown in Figs. 2a to 3a, the tripping unit may further include a reset spring 25 which can bias the armature 22 in the first position, for example, the reset spring 25 may have a pre-deformation amount to directly bias the armature 22 or indirectly bias the armature 4 in the first position via the pull rod 5, so as to ensure that the armature 4 remains in the first position when the current is lower than the threshold, and when the current is greater than the threshold, the armature 22 can move to the second position against the bias of the reset spring 25, and it is able to automatically reset at the end of this movement process. Preferably, the reset spring 6 is compressed and biased, which is beneficial to saving space and making the structure more compact.

[0034] Further, the reset spring 25 is detachably mounted to the tripping unit housing 21, and in particular, the reset spring 25 is a torsion spring, which comprises a circular ring section and free ends at both ends of the circular ring section, and the circular ring section is sleeved on the support column 27 of the tripping unit 2. The support column 27 extends perpendicular to the second direction D2 and has a free end at one end, as shown in Fig. 2b, such that the reset spring 25 can be detached from the support column 27 for convenient replacement.

[0035] Further, one end of the reset spring 25 is coupled to (for example, abuts against) the pull rod 23, as shown in Figs. 2b and 3b. The other end may be coupled to the tripping unit housing 21, for example, accommodated in the accommodation portions 26 of the tripping unit housing 21. The tripping unit housing 21 may include a plurality of accommodation portions 26, as shown in Figs. 2a-3b. For example, the plurality of accommodation portions 26 are arranged in the second direction D2, and the other end of the reset spring 25 extends into one of the pluralities of accommodation portions 26. Extending into different accommodation portions causes the reset spring to have different degrees of pre-deformation. Therefore, the resistance needed to overcome the magnetic tripping action can be adjusted according to different models and different application scenarios, such that the electromagnetic tripping device can be used in various scenarios. The targeted adjustment makes the tripping more stable and reliable, and meets different requirements.

[0036] Further, the tripping unit 2 may further include a guide groove 28 extending along the second direction D2, and in particular, for example, has two guide grooves 28, as shown in Fig. 2a. The pull rod 23 comprises a tab 233 extending into the guide groove 28, as shown in Fig. 2b (in which, for convenience of illustration, a part of the tripping unit housing is cut away to show its interior structure), such that the pull rod 23 can move along the guide groove 28 in the second direction D2.

[0037] When short-circuit current or overload occurs, the armature 22 is acted by electromagnetic force to overcome the biasing force of the reset spring 25 to complete tripping. However, in order to ensure that the armature 22 is reliably sucked into the yoke 14, a certain gap needs to be set between the armature 22 and the yoke 14 in the third direction D3, which makes it very important to guide the armature 22 during the movement and accurately position it relative to the yoke 14, so as to avoid the tripping failure caused by the collision with the yoke 14 during the movement.

[0038] To this end, the tripping unit housing 21 may further include a guiding portion 29, as shown in Figs. 2a and 2b, the guiding portion 29 may include two first surfaces 291 (only one is shown in Fig. 2b) perpendicular to the third direction D3 and facing each other, and two second surfaces 292 (only one is shown in Figs. 2a and 2b) perpendicular to the third direction D3 and facing away from each other. The planes where the two first surfaces291 are located being positioned between the planes where the two second surfaces 292 are located, as shown in Figs. 3a and 3b. Thus, the armature 22 can move in the second direction D2 between the two opposite first surfaces 291, as shown in Fig. 3b. The two second surfaces 292 are located between the first section 141 and the second section 142 of the yoke 14, and the two second surfaces 292abut against the first section 141 and the second section 142 of the yoke 14 in the third direction D3, respectively, as shown in Figs. 3a and 3b.

[0039] As shown in Figs. 3a and 3b, the distance between the first section 141 and the second section 142 of the yoke 14 is greater than the width of the armature 22. After the tripping unit 2 is installed on the breaking unit 1, the position of the yoke 14 in the third direction D3 will be defined by the second surface 292, and the position of the armature 22 in the third direction D3 will be defined by the first surface 291. The positions of the yoke 14 and the armature 22 in the third direction D3 are defined by the guiding portion 29, and the first surface 291 and the second surface 292 are spaced apart in the third direction D3 (it is difficult to show in Fig. 3b because the gap is too small, but those skilled in the art can understand), such that a reliable gap can be ensured between the yoke 14 and the armature 22 in the third direction D3.

[0040] The present disclosure realizes reliable guidance of the armature 22 during the movement through the mating relationship between the guiding portion 29 of the tripping unit 2 and the armature 22 and the yoke 14 respectively. The armature 22 and the yoke 14 are guaranteed not to collide in the movement through the first surface 291 and the second surface 292 spaced apart in the third direction D3, such that there is no need for components processing and assembly with too high precision requirements, and the structure is simple, which is beneficial to reducing the cost.

[0041] Fig. 4 shows a schematic perspective view of an electromagnetic tripping device comprising the tripping unit 2 in Figs. 2a and 2b. The electromagnetic tripping device may include a plurality of breaking units 1, for example, 2 (as shown in Fig. 4), 3, 4, etc. Each breaking unit 1 can be provided with a corresponding tripping unit 2.

[0042] Further, the present disclosure also proposes another embodiment of the tripping unit 2, as shown in Fig. 5, that is, the tripping unit 2 with a plurality of sets comprising the combination of the armature 22, the pull rod 23, the reset spring 25 and the trigger member 24, for example, two sets as shown in Fig. 5, or three sets, four sets, etc. The structure and mating relationship of the armature 22, the pull rod 23, the reset spring 25 and the trigger member 24 in each combination set are the same as those described above in connection with Figs. 2a- 3b. In particular, all the trigger members 24 may share a pivot shaft to pivot synchronously, as shown in Fig. 5.

[0043] Fig. 6 shows an electromagnetic tripping device comprising four breaking units 1, and every two adjacent breaking units 1 are provided with a tripping unit 2 as shown in Fig. 5.

[0044] The present disclosure also proposes an electrical device, such as a contactor or a circuit breaker, comprising the electromagnetic tripping device according to the present disclosure.

[0045] It should be understood that the above description is intended to be illustrative rather than limiting. For example, the above embodiments (and / or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of this disclosure without departing from its scope. The functions or performances of various elements or modules described herein are only for illustration and are in no way restrictive, but only exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art after reading the above description. Therefore, the scope of the present disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

[0046] In the appended claims, the terms "comprising" and "in which" are used as simple English equivalents of the corresponding terms "comprising" and "in which". In addition, in the following claims, the terms "first", "second" and "third" are only used as labels, and no numerical requirements are intended to be imposed on their objects.List of reference numerals:

[0047] 1 breaking unit, 11 breaking unit housing, 12 static contact conducting bar, 121 extension segment, 122 external connection segment, 13 trip-actuating member, 14 yoke, 141 first section, 142 second section, 143 third section, 2 tripping unit, 21 tripping unit housing, 22 armature, 23 pull rod, 231 first end, 232 second end, 233 tab, 24 trigger member, 25 reset spring, 26 accommodation portion, 27 support column, 28 guide groove, 29 guiding portion, 291 first surface, 292 second surface, D1 first direction, D2 second direction, D3 third direction

Examples

Embodiment Construction

[0020]In order to make the purpose, scheme, and advantages of the technical scheme of the present disclosure clearer, the technical scheme of the embodiment of the present disclosure will be described clearly and completely with the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meaning in the art.. Like reference numerals in the drawings represent like components.

[0021]In the description of this disclosure, it should be noted that unless otherwise specified and limited, the terms "instal", "link" and "connect" should be broadly understood, for example, they can be fixed connection, detachable connection or integrated connection; It can be a mechanical connection or an electrical connection; Can be directly connected, can also be indirectly connected through an intermediate medium, and can be connected inside two elements. For those skilled in the art, the specific meanings of the above ter...

Claims

1. An electromagnetic tripping device, characterized in that, comprises a breaking unit comprising: a breaking unit housing, a static contact conducting bar fixed on the breaking unit housing and extending out of the breaking unit housing in a first direction, a trip-actuating member configured to be triggerable to cause the breaking unit to complete a tripping action, a tripping unit comprising: a tripping unit housing, a trigger member being movably mounted on the tripping unit housing relative to the tripping unit housing, wherein the tripping unit is detachably mounted as a whole to the breaking unit, and in a state where the tripping unit is mounted to the breaking unit, the trigger member moves relative to the tripping unit housing to trigger the trip-actuating member when a current flowing through the static contact conducting bar exceeds a threshold.

2. The electromagnetic tripping device according to claim 1, characterized in that, the tripping unit further comprises: an armature arranged to be movable between a first position and a second position in a second direction relative to the tripping unit housing, a pull rod arranged to extend in a second direction, the pull rod having a first end and a second end, the first end being connected with the armature to move in the second direction relative to the tripping unit housing together with the armature, and the second end of the pull rod being fitted with the trigger member such that the movement of the pull rod from the first position to the second position causes the trigger member to perform a pivoting motion, wherein, in the state that the tripping unit is installed to the breaking unit, the second position is closer to the static contact conducting bar than the first position, the pivoting motion of the trigger member can trigger the trip-actuating member, and when the current flowing through the static contact conducting bar exceeds the threshold, the armature can move to the second position in the second direction towards the static contact conducting bar.

3. The electromagnetic tripping device according to claim 2, characterized in that, the static contact conducting bar is fixed on the breaking unit housing and has an extension segment and an external connection segment extending in the first direction, and the external connection segment being located at the free end of the static contact conducting bar, and the breaking unit further comprises a yoke, the yoke being fixed on the breaking unit housing adjacent to the extension segment, in the state that the tripping unit is installed to the breaking unit, the second direction being perpendicular to the first direction, and the external connection segment extending out of the breaking unit housing and the tripping unit housing, wherein the yoke attracting the armature to move to the second position along the second direction toward the extension segment when the current flows through the static contact conducting bar exceeds the threshold.

4. The electromagnetic tripping device according to claim 3, characterized in that, the tripping unit further comprises a reset spring detachably mounted to the tripping unit housing, and the reset spring biases the armature to the first position.

5. The electromagnetic tripping device according to claim 4, characterized in that, the reset spring is a torsion spring, one end of the reset spring being connected with the pull rod, the tripping unit housing comprises a plurality of accommodation portions, the other end of the reset spring extending into one of the plurality of accommodation portions, wherein extending into different accommodation portions causes the reset spring to have different degrees of pre-deformation.

6. The electromagnetic tripping device according to claim 5, characterized in that, the tripping unit comprises a support column extending perpendicular to the second direction, one end of the support column being a free end, and a circular ring section of the reset spring being sleeved on the support column.

7. The electromagnetic tripping device according to claim 3, characterized in that, the tripping unit further comprises a guide groove extending in the second direction, and the pull rod comprises a tab extending into the guide groove, such that the pull rod moves along the guide groove in a second direction.

8. The electromagnetic tripping device according to claim 3, characterized in that, the yoke comprises a first section, a second section, and a connecting section connecting the first section and the second section, and has a U-shaped structure, an opening of the U-shaped structure faces the armature, and the extension segment being arranged between the first section and the second section.

9. The electromagnetic tripping device according to claim 8, characterized in that, the tripping unit housing also comprises guiding portion, which comprises two first surfaces perpendicular to a third direction and facing each other, and two second surfaces perpendicular to the third direction and facing away from each other, planes where the two first surfaces are located being positioned between the planes where the two second surfaces are located, the third direction being perpendicular to the first direction and the second direction, the armature moving in the second direction between the two opposite first surfaces, the two second surfaces being located in the first section and the second section of the yoke and respectively abutting against the first section and the second section of the yoke in the third direction.

10. The electromagnetic tripping device according to any one of claims 1-9, characterized in that, the electromagnetic tripping device comprises a plurality of breaking units.

11. The electromagnetic tripping device according to claim 10, characterized in that, the tripping unit comprises two sets of armatures, a pull rod, a reset spring and a trigger member, wherein all the trigger share one pivot shaft to pivot synchronously.

12. An electrical device, characterized in that, comprising: the electromagnetic tripping device according to any one of the preceding claims 1-11.

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