JP2014199755A - Electromagnetic tripping device and circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic tripping device and a circuit breaker ensuring a stabilized coil spring load.SOLUTION: An electromagnetic tripping device 90 includes a coil spring 98, a fixed iron core 93 to be inserted into the coil spring 98, and a movable iron core 97 provided while separated from the fixed iron core 93 via the coil spring 98. In the electromagnetic tripping device 90, the fixed iron core 93 and the movable iron core 97 are brought into contact with each other or separated from each other by an electromagnetic force acting on the fixed iron core 93. The electromagnetic tripping device 90 includes a spacer 100 for suppressing the space between the outer periphery of the fixed iron core 93 and the inner periphery of the coil spring 98.

Description

  The present invention relates to an electromagnetic trip device and a circuit breaker.

  When the circuit breaker reaches a predetermined circuit state in a circuit in which a power source and a load are connected, the circuit breaker disconnects between the contacts to interrupt the circuit (see, for example, Patent Document 1). Examples of the circuit breaker include a circuit breaker, a leakage breaker, an overvoltage breaker, an undervoltage breaker, and the like. The circuit breaker interrupts the circuit when an abnormal current flows due to a short circuit or overload. The earth leakage breaker breaks the circuit when an earth leakage occurs. The overvoltage circuit breaker breaks the circuit when the voltage of the circuit is higher than a predetermined voltage. The undervoltage circuit breaker breaks the circuit when the voltage of the circuit is lower than a predetermined voltage. A composite circuit breaker combining the above circuit breakers may be used.

The circuit breaker includes a breaking mechanism that opens and closes the contacts, a handle that opens and closes the circuit, and an electromagnetic trip device that trips the contacts through the breaking mechanism.
In the electromagnetic tripping device provided in the circuit breaker described in Patent Document 1, the interlocking rod protrudes from the side surface of the housing, and the interlocking rod is inserted into the housing of the connected circuit breaker. When the abnormality occurs, the interlocking rod is moved to trip the circuit breaker breaking mechanism. In the electromagnet device, a coil wound around a bobbin, a first iron core passed through a hole in the bobbin, a second iron core attracted to the magnetic pole of the first iron core when energized to the coil, and a second iron core are adsorbed. And a coil spring that applies a load in a direction opposite to the direction in which the load is applied.

JP 2000-231869 A

  By the way, in the electromagnetic tripping device as described above, the first iron core has a structure inserted into a coil spring. And there is a space between the outer periphery of the first iron core and the inner diameter of the coil spring. For this reason, if the coil spring is deformed when the coil spring is compressed, a desired coil spring load may not be obtained. In addition, there is a similar problem in an electromagnetic trip device having a structure in which an iron core is inserted through a coil spring. Therefore, there is a need for an electromagnetic trip device and a circuit breaker that can obtain a stable coil spring load.

  This invention is made | formed in view of such a situation, The objective is to provide the electromagnetic trip apparatus and circuit breaker which can obtain the stable coil spring load.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
An electromagnetic trip device that solves the above problem is a coil spring, a first iron core that is inserted inside the coil spring, and a second iron coil that is provided apart from the first iron core via the coil spring. An electromagnetic trip device in which the first iron core and the second iron core are brought into contact with and separated from each other by electromagnetic force acting on the first iron core, the outer periphery of the first iron core, and the coil spring The gist of the invention is to provide a space suppressing member that suppresses the space with the inner periphery.

About the said electromagnetic trip apparatus and a circuit breaker, it is preferable that the said space suppression member is integrally formed with the said 1st iron core.
A circuit breaker that solves the above-described problem, wherein the circuit breaker rotates between the electromagnetic trip device, an on position that closes the movable contact with respect to the fixed contact, and an off position that opens the movable contact with respect to the fixed contact. A handle that is movably supported; and a blocking mechanism that is directly or indirectly connected to the handle and that contacts and separates the movable contact with respect to the fixed contact in response to rotation of the handle. When the connected circuit reaches a predetermined circuit state, the tripping device preferably disconnects the contacts to interrupt the circuit.

  With respect to the circuit breaker, the electromagnetic trip device disconnects between the contacts when the circuit becomes a predetermined voltage or less to interrupt the circuit, and when the circuit is below the predetermined voltage, The attraction force with the second iron core is set to be smaller than the biasing force of the coil spring, and it is preferable that the first iron core and the second iron core are separated when the circuit becomes the predetermined voltage or less.

  With respect to the circuit breaker, the electromagnetic trip device includes a link member linked to the breaker mechanism, and when the circuit becomes a predetermined voltage or higher, the circuit between the contacts is tripped through the link member. And the attraction force between the first iron core and the second iron core is set larger than the urging force of the coil spring when the voltage is equal to or higher than the predetermined voltage, and when the circuit is equal to or higher than the predetermined voltage, It is preferable that the first iron core and the second iron core are adsorbed to separate the fixed contact and the movable contact.

  According to the present invention, a stable coil spring load can be obtained.

The disassembled perspective view which shows the structure of a circuit breaker. The left view which shows the structure of the circuit breaker in an OFF state. The right view which shows the structure of the circuit breaker in an OFF state. The perspective view which shows the structure of an electromagnetic trip apparatus. The disassembled perspective view which shows the structure of an electromagnetic trip apparatus. The side view which shows the structure of an electromagnetic trip apparatus. Sectional drawing which shows the structure of an electromagnetic trip apparatus. 8-8 sectional drawing of FIG. 6 which shows the structure of an electromagnetic trip apparatus. The left view which shows the structure of the circuit breaker in an ON state. The left view which shows the structure of the circuit breaker in the moment when an undervoltage trip. The left view which shows the structure of the circuit breaker in an undervoltage trip state. The perspective view which shows the structure of the electromagnetic trip apparatus of another example. Sectional drawing which shows the structure of an electromagnetic trip apparatus. The left view which shows the structure of the circuit breaker in the ON state of another example. The left view which shows the structure of the circuit breaker in an OFF state.

Hereinafter, an embodiment in which an electromagnetic trip device is embodied as an undervoltage circuit breaker, which is a type of circuit breaker, will be described with reference to FIGS.
As shown in FIG. 1, the undervoltage circuit breaker breaks the circuit when the voltage of the circuit becomes lower than a predetermined voltage. An undervoltage circuit breaker is used in combination with a circuit breaker such as a circuit breaker for breaking a circuit when an abnormal current due to a short circuit or overload flows. The casing 10 of the undervoltage circuit breaker has a flat shape, for example. A terminal portion 11 for connecting an external electric wire is provided on the rear side of the undervoltage breaker housing 10 in the figure. The undervoltage circuit breaker housing 10 includes a first cover 14 and a second cover 15. The first cover 14 and the second cover 15 are formed of a synthetic resin having insulating properties. The first cover 14 and the second cover 15 are formed in a box shape having openings 14a and 15a. The opening 14a of the first cover 14 and the opening 15a of the second cover 15 are assembled to face each other. In the space formed by the first cover 14 and the second cover 15, the handle 20, the display member 30, the blocking mechanism 40, and the electromagnetic trip device 90 are arranged. A handle gate 16 is formed at the center of the upper surface of the casing 10 of the undervoltage circuit breaker. A display window 17 is formed on the side of the upper surface of the casing 10 of the undervoltage circuit breaker opposite to the terminal portion 11.

  As shown in FIGS. 2 and 3, the shut-off mechanism 40 includes a interlocking piece 41, a drive member 50, a thrust bar 60, a latch member 70, an electromagnetic trip device 90, and a circuit board on which an excitation circuit is mounted. 13 is stored. A display member 30 and a display latch member 80 are housed inside the housing 10 in order to display the operating state of the undervoltage circuit breaker.

  The handle 20 includes a columnar rotation unit 21 and an operation unit 22. The rotation unit 21 rotates about the first rotation shaft 18. The first rotation shaft 18 is provided on the first cover 14. The handle 20 rotates about the first rotation shaft 18 when the operation unit 22 is operated. The operation portion 22 is provided with a rectangular bar-like connecting rod 23 that is connected to the operation portion of the handle of the circuit breaker to be connected. Therefore, the handle 20 of the undervoltage circuit breaker is rotated together with the handles of other circuit breakers by the connecting rod 23. The ON position (energization position) is when the operation unit 22 is located on the side opposite to the terminal unit 11. When the operation unit 22 is located on the terminal unit 11 side, it is an off position (current interruption position). The handle 20 is constantly applied with an urging force by a handle spring 25 in the direction of rotation from the on position to the off position. The rotation direction of the handle 20 from the off position to the on position is referred to as “on rotation direction”, and the rotation direction of the handle 20 from the off position to the on position is referred to as “off rotation direction”.

  The interlocking piece 41 is supported so as to be rotatable about the third rotation shaft 43. The interlocking piece 41 holds one end of a metal interlocking rod 42. The other end of the interlocking rod 42 protrudes outside from the slit 15 b of the second cover 15. The other end of the interlocking rod 42 is connected to an interlocking piece of another circuit breaker.

  The drive member 50, the latch member 70, and the display member 30 rotate about the second rotation shaft 19. Both ends of the second rotation shaft 19 are held by the housing 10. The drive member 50 is constantly applied with an urging force in the off-rotation direction of the handle 20 by a return spring 55 made of a coil spring and a return spring 56 made of a torsion coil spring. One ends of the return springs 55 and 56 are respectively locked to the first cover 14. The other ends of the return springs 55 and 56 are locked to the drive member 50. An urging force in the off-rotation direction is constantly applied to the handle 20 by the handle spring 25. In addition, the display latch member 80 is constantly given a biasing force in the on-rotation direction of the handle 20 by a display latch spring 83 that is a torsion coil spring.

  The thrust bar 60 is formed in a U shape by a metal round bar. The operation side end 61 of the thrust bar 60 is inserted into the connection hole 24 of the handle 20. The transmission side end 62 of the thrust bar 60 is disposed in a link hole 54 formed by the engagement protrusion 51 of the drive member 50 and the latch piece 71 of the latch member 70. This state is a state where the thrust bar 60 is latched by the latch member 70 (latched state). In this latched state, the movement of the handle 20 is transmitted to the drive member 50 via the thrust bar 60. On the other hand, when the driving member 50 is driven by the electromagnetic trip device 90 and the driving member 50 and the latch member 70 are relatively rotated, the link hole 54 is opened. Then, the transmission side end 62 of the thrust bar 60 comes out of the link hole 54, and the thrust bar 60 is unlatched (latched state).

  The display latch member 80 is supported so as to be rotatable about the fourth rotation shaft 82. The display latch member 80 is constantly applied with an urging force in the off-rotation direction of the handle 20 by the display latch spring 83. The upper end portion 81 of the display latch member 80 comes into contact with the engaging convex portion 32 provided on the lower side of the display member 30 from the lower side, so that the display member 30 cannot be rotated in the off rotation direction of the handle 20. ing. The tip of the display member 30 is a display unit 31 that displays a circuit state. The upper surface of the display unit 31 is divided into two regions along the direction of the display member 30. On the upper surface of the display member 30, a normal region 31a indicating a normal state and a trip region 31b indicating a trip state are arranged in order from the handle 20 side. One of these areas 31a and 31b is exposed from the display window 17.

  A circuit board 13 is accommodated in the housing 10. The circuit board 13 includes an electromagnetic trip device 90 that drives the latch member 70 in response to energization of the coil 92, and an excitation circuit that stops excitation of the coil 92 of the electromagnetic trip device 90 when an abnormality in the power supply voltage is detected. The component is mounted.

  4 and 5, the electromagnetic tripping device 90 includes a synthetic resin bobbin 91, a coil 92, a fixed iron core 93, a spacer 100, a holder member 96, a movable iron core 97, and a coil. And a spring 98. The fixed iron core 93 corresponds to the first iron core, the movable iron core 97 corresponds to the second iron core, and the spacer 100 corresponds to the space suppressing member. Further, the holder member 96 functions as a link member.

  The fixed iron core 93 is a magnetic material (for example, iron) and is formed in a U shape by a plate material. The lower leg piece 95 of the fixed iron core 93 is inserted into the hole of the bobbin 91. At both ends of the bobbin 91, an insertion side flange 91a and a protruding side flange 91b are provided. The tip of the lower leg piece 95 of the fixed iron core 93 is exposed from the protruding side flange portion 91 b of the bobbin 91. A coil spring 98 is provided around the upper leg piece 94 of the fixed iron core 93.

  As shown in FIGS. 6 and 7, the holder member 96 is rotatably attached to the protruding side flange 91 b of the bobbin 91. A protrusion 96 b is provided at the tip of the holder member 96. The protrusion 96b contacts the driving member 50 when the holder member 96 rotates, and rotates the driving member 50 in the on-rotation direction. The holder member 96 holds a plate-shaped movable iron core 97 made of a magnetic material. The holder member 96 rotates around a holder rotation shaft 96a held by the protruding side flange 91b. The movable iron core 97 is located between a position where it comes into contact with the tip surfaces (magnetic pole surfaces) of both leg pieces 94, 95 of the fixed iron core 93 and a position where it is separated from the tip surfaces (magnetic pole surfaces) of both leg pieces 94, 95 of the fixed iron core 93. It can be rotated with.

  As shown in FIGS. 7 and 8, a spacer 100 that suppresses a space between the outer periphery of the fixed iron core 93 and the inner periphery of the coil spring 98 is attached to the fixed iron core 93. The spacer 100 includes two plate pieces 101 and 102 extending in the extending direction of the upper leg piece 94 of the fixed iron core 93 and facing each other, and a connection piece 103 connecting the plate pieces 101 and 102. The spacer 100 is positioned in the front-rear direction by the connection piece 103 contacting the back surface 93 a of the fixed iron core 93. The spacer 100 is positioned in the vertical direction by the lower part of the plate pieces 101, 102 on the connection piece 103 side coming into contact with the insertion side flange 91 a of the bobbin 91. The outer shape of the spacer 100 is set so as not to generate a frictional force that prevents the coil spring 98 from expanding and contracting. The spacer 100 is located in the space between the outer periphery of the fixed iron core 93 and the inner periphery of the coil spring 98, thereby suppressing the coil spring 98 from being deformed inside the coil spring 98. For this reason, the coil spring 98 is not greatly deformed, and the load obtained from the coil spring 98 is stabilized. Further, the magnetic field is stabilized by stabilizing the coil spring load.

The operation of the undervoltage circuit breaker will be described with reference to FIGS. 2, 3 and 9 to 11.
First, an operation when the handle 20 is moved from the off position to the on position and the undervoltage circuit breaker is switched from the off state shown in FIG. 2 to the on state shown in FIG. 9 will be described.

  As shown in FIG. 9, when the handle 20 is rotated from the off position to the on position (on rotation direction), the thrust protrusion 60 of the drive member 50 is pushed by the thrust bar 60, and the drive member 50 is Rotates in the on rotation direction.

  Here, a straight line connecting the first rotation shaft 18 of the handle 20 and the transmission side end 62 of the thrust bar 60 is defined as a switching boundary line L. When the handle 20 is rotated and the operation side end 61 of the thrust bar 60 exceeds the switching boundary line L, the transmission side end 62 of the thrust bar 60 is stopped while being pressed against the engagement protrusion 51. At this time, the handle 20 and the thrust bar 60 are held in the on position, and the undervoltage circuit breaker is turned on. The latch member 70 receives the urging force of the latch spring 34 and rotates to a position where it comes into contact with the transmission side end 62 side of the thrust bar 60. When the locking portion 33 of the display member 30 is pushed by the driving member 50, the display member 30 rotates in the on rotation direction and moves to the display reset position. In this state, the display latch member 80 receives an urging force and moves to a position where the display member 30 can be latched. The interlocking piece 41 rotates in the on-rotation direction in accordance with the rotation of the driving member 50 and displaces the interlocking piece of another circuit breaker via the interlocking rod 42. Further, when the power supply voltage is normal in the ON state, the electromagnetic trip device 90 is energized to the coil 92 by the excitation circuit, and the movable iron core 97 is attracted to the fixed iron core 93. The holder member 96 is rotated to the on position against the biasing force of the coil spring 98. In this state, the protrusion 96 b at the tip of the holder member 96 has moved to a position away from the drive member 50.

Next, the operation when the handle 20 is moved from the on position to the off position to switch the undervoltage circuit breaker from the on state shown in FIG. 9 to the off state shown in FIG. 2 will be described.
As shown in FIG. 2, when the handle 20 is rotated in the off rotation direction from the on position to the off position, the latch member 70 is pulled by the thrust bar 60. The latch member 70 rotates in the off-rotation direction of the handle 20 against the urging force of the latch spring 34, and the link hole 54 is opened upward. The drive member 50 receives the urging force of the return springs 55 and 56, rotates in the off-rotation direction of the handle 20, contacts the locking piece 14 b of the first cover 14, and stops. When the interlocking piece 41 is pushed by the protrusion 52 of the driving member 50, the interlocking piece 41 rotates in the off-rotation direction of the handle 20 against the urging force. The display member 30 receives the urging force of the latch spring 34 and rotates in the off-rotation direction of the handle 20, and the engagement convex portion 32 comes into contact with the upper end portion 81 of the display latch member 80 and stops. In this state, the normal area 31 a of the display unit 31 is exposed from the display window 17. The protrusion 96 b at the tip of the holder member 96 is pushed by the engaging protrusion 53 of the drive member 50. The holder member 96 rotates in the off-rotation direction of the handle 20 and is held at a position where the movable iron core 97 contacts the magnetic pole surface of the fixed iron core 93.

  Next, when the undervoltage breaker is switched from the ON state shown in FIG. 9 to the trip state shown in FIG. 11 through the moment when the undervoltage trip of FIG. The operation will be described.

  As shown in FIG. 10, when the excitation circuit detects that the power supply voltage is lower than a predetermined set value lower than the rated voltage (undervoltage condition) in the on state, the excitation circuit Is tripped, the switch connected in series with the coil 92 is turned off. At this time, the energization of the coil 92 is stopped, and the electromagnetic attractive force generated between the fixed iron core 93 and the movable iron core 97 is eliminated. Therefore, the holder member 96 receives the biasing force of the coil spring 98 and the handle 20 is turned on. Rotate in the direction. When the holder member 96 rotates in the on-rotation direction of the handle 20, the engagement protrusion 53 of the drive member 50 is pushed on the distal end side of the holder member 96. The latch member 70 rotates in the off-rotation direction of the handle 20, and the transmission side end portion 62 of the thrust bar 60 is separated from the latch piece 71 of the latch member 70. When the latch piece 71 of the latch member 70 is separated from the transmission side end 62 of the thrust bar 60, the handle 20 rotates in the off-rotation direction around the operation side end 61.

  As shown in FIG. 11, since the transmission side end 62 of the thrust bar 60 is disengaged outside the link hole 54, the drive member 50 that has lost the support of the thrust bar 60 receives the biasing force of the return springs 55 and 56. Then, the handle 20 rotates in the off rotation direction and moves to the off position. Further, the interlocking piece 41 is pushed upward by the protrusion 52 of the driving member 50, the opening / closing mechanism of another circuit breaker is driven by the interlocking rod 42, and the contact is turned off by the opening / closing mechanism. Thereby, the power supply to the load device connected to another circuit breaker is interrupted, and the load device can be protected. The holder member 96 receives the urging force of the coil spring 98 and rotates in the on-rotation direction of the handle 20, but when the protrusion 96b comes into contact with the engaging protrusion 53 of the drive member 50, the urging force of the return springs 55 and 56 is applied. Is set to be larger than the urging force of the coil spring 98, the handle 20 cannot be further rotated in the on-rotation direction. When the driving member 50 receives the urging force of the return springs 55 and 56 and rotates in the off-rotation direction of the handle 20, the holder member 96 is pushed by the engaging protrusion 53 of the driving member 50, whereby the holder member 96 rotates in the off-rotation direction of the handle 20 and moves to a position where the movable iron core 97 contacts the magnetic pole surface of the fixed iron core 93.

  Further, when the display latch member 80 is pushed by the protrusion 96c (see FIG. 3) of the holder member 96 and rotates in the off rotation direction of the handle 20, the latch of the display member 30 is released. When the latch is released, the display member 30 receives the biasing force of the latch spring 34 and rotates in the off-rotation direction of the handle 20. A trip area 31 b of the display unit 31 is exposed from the display window 17. Thereafter, when the handle 20 receives the urging force of the handle spring 25 and rotates in the off-rotation direction of the handle 20 and moves to the off position, the transmission side end 62 of the thrust bar 60 passes through the opening of the link hole 54. It is inserted into the link hole 54 and moved to a position where it engages with the latch piece 71. At this time, the transmission side end portion 62 of the thrust bar 60 is inserted into the link hole 54 surrounded by the drive member 50 and the latch member 70, and the handle 20 is rotated in the on-rotation direction and moved to the on position. Then, the state shown in FIG. 9 is obtained.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) Even if the coil spring 98 is to be deformed into a space formed by the outer periphery of the upper leg piece 94 of the fixed iron core 93 and the inner periphery of the coil spring 98 itself, the spacer 100 exists in the space. For this reason, deformation of the coil spring 98 can be suppressed. Therefore, a stable coil spring load can be obtained.

  (2) A circuit breaker including an electromagnetic trip device 90 in which the spacer 100 is present in a space in which the coil spring 98 is formed by the outer periphery of the fixed iron core 93 and the inner periphery of the coil spring 98 itself. For this reason, when the circuit is interrupted, the deformation of the coil spring 98 is suppressed, and the stability of the circuit interrupt can be improved.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the plate pieces 101 and 102 of the spacer 100 are formed in a flat plate shape, but the surface of the plate pieces 101 and 102 facing the coil spring 98 may be formed in a cross-sectional arc shape along the inner peripheral surface of the coil spring 98. Good. In this way, the gap between the outer shape of the fixed iron core 93 including the spacer 100 and the inner periphery of the coil spring 98 can be reduced, and the deformation of the coil spring 98 to the inside of the coil spring 98 is reliably suppressed. be able to.

  In the above embodiment, the spacer 100 is separately inserted into the space between the outer periphery of the fixed iron core 93 and the inner periphery of the coil spring 98, but the fixed iron core 93 and the spacer 100 may be formed integrally. For example, as shown in FIG. 12, the fixed iron core 193 is a U-shaped cylinder. That is, the outer diameter of the upper leg piece 194 of the fixed iron core 193 is set slightly smaller than the inner diameter of the coil spring 98. If it does in this way, as FIG. 13 shows, it can suppress reliably that the coil spring 98 deform | transforms into the coil spring 98 inside. For this reason, the coil spring 98 is not greatly deformed. In addition, the increase in the number of parts is suppressed, and there is no need to assemble the fixed iron core 93 and the spacer 100 separately.

  In the above embodiment, the electromagnetic trip device is used as an undervoltage circuit breaker, but the electromagnetic trip device may be used as an overvoltage circuit breaker. The overvoltage circuit breaker breaks the circuit when the voltage of the circuit becomes higher than a predetermined voltage. For example, as shown in FIGS. 14 and 15, the overvoltage circuit breaker includes a movable contact plate 201 in the driving member 50, and breaks off by moving the movable contact 202 provided on the movable contact plate 201 from the fixed contact 203. To do. In the electromagnetic trip device 290 provided in the overvoltage circuit breaker, the positions of the bobbin 291 (coil 292) and the coil spring 298 with respect to the fixed iron core 293 are opposite to those in the above embodiment. The holder member 296 rotates around a holder rotation shaft 296a provided on the top of the bobbin 291. The movable iron core 297 of the electromagnetic trip device 290 is separated from the fixed iron core 293 during normal operation, and contacts the fixed iron core 293 when an overvoltage occurs. At this time, when the tip of the holder member 296 contacts the latch member 70, the driving member 50 is displaced and the movable iron core 297 is pulled away from the fixed iron core 293. On the lower leg piece 295 of the fixed iron core 293, the same spacer 100 as that of the above embodiment is attached upside down. For this reason, the electromagnetic trip device 290 of the present invention can also be employed in an overvoltage circuit breaker.

  L ... switching boundary line, 10 ... housing, 11 ... terminal part, 13 ... circuit board, 14 ... first cover, 14a ... opening, 14b ... locking piece, 15 ... second cover, 15a ... opening, 15b ... Slit, 16 ... Handle gate, 17 ... Display window, 18 ... First rotating shaft, 19 ... Second rotating shaft, 20 ... Handle, 21 ... Rotating portion, 22 ... Operating portion, 24 ... Connection hole, 25 DESCRIPTION OF SYMBOLS ... Handle spring, 30 ... Display member, 31 ... Display part, 31a ... Normal area | region, 31b ... Trip area | region, 32 ... Engagement convex part, 33 ... Locking part, 34 ... Latch spring, 36 ... Return spring, 40 ... Shut off Mechanism: 41 ... interlocking piece, 42 ... interlocking rod, 43 ... third rotating shaft, 50 ... driving member, 51 ... engaging protrusion, 52 ... protrusion, 53 ... engaging protrusion, 54 ... link hole, 55 ... Return spring 56 ... Return spring 60 ... Thrust bar 61 ... Operation side end 62 ... Transmission side , 70 ... latch member, 71 ... latch piece, 80 ... display latch member, 81 ... upper end, 82 ... fourth pivot shaft, 83 ... display latch spring, 90 ... electromagnetic trip device, 91 ... bobbin, 91a ... Insertion side flange, 91b ... projection side flange, 92 ... coil, 93 ... fixed iron core, 93a ... back surface, 94 ... upper leg piece, 95 ... lower leg piece, 96 ... holder member, 96a ... holder rotating shaft, 96b ... projection, 96c ... projection, 97 ... movable iron core, 98 ... coil spring, 100 ... spacer, 101 ... plate piece, 102 ... plate piece, 103 ... connection piece, 193 ... fixed iron core, 201 ... movable contact plate, 202 ... Movable contact, 203 ... fixed contact, 290 ... electromagnetic trip device, 291 ... bobbin, 293 ... fixed iron core, 295 ... lower leg piece, 296 ... holder member, 296a ... holder rotating shaft, 297 ... movable iron core, 298 ... Coil spring.

Claims (5)

A coil spring;
A first iron core inserted inside the coil spring;
A second iron core provided apart from the first iron core via the coil spring;
In the electromagnetic trip device in which the first iron core and the second iron core are contacted and separated by the electromagnetic force acting on the first iron core,
An electromagnetic trip device comprising: a space suppressing member that suppresses a space between an outer periphery of the first iron core and an inner periphery of the coil spring. The electromagnetic trip device according to claim 1, wherein the space suppressing member is formed integrally with the first iron core. The electromagnetic trip device according to claim 1 or 2,
A handle that is rotatably supported between an on position that closes the movable contact with respect to the fixed contact and an off position that opens the movable contact with respect to the fixed contact;
A blocking mechanism that is directly or indirectly connected to the handle and that contacts and separates the movable contact with respect to the fixed contact in accordance with the rotation of the handle;
When the connected circuit reaches a predetermined circuit state, the electromagnetic trip device trips between the contacts to interrupt the circuit. The circuit breaker according to claim 3,
The electromagnetic trip device, when the circuit becomes a predetermined voltage or less, trips between the contacts to interrupt the circuit,
When the voltage is equal to or lower than the predetermined voltage, the attractive force between the first iron core and the second iron core is set smaller than the urging force of the coil spring,
The circuit breaker, wherein the first iron core and the second iron core are separated from each other when the circuit becomes equal to or lower than the predetermined voltage. The circuit breaker according to claim 3,
The electromagnetic trip device includes a link member linked to the blocking mechanism,
When the circuit becomes a predetermined voltage or more, the circuit is cut off by pulling off the contacts through the link member,
When the voltage is equal to or higher than the predetermined voltage, the attractive force between the first iron core and the second iron core is set larger than the urging force of the coil spring,
The circuit breaker, wherein when the circuit becomes equal to or higher than the predetermined voltage, the first iron core and the second iron core are adsorbed to separate the fixed contact and the movable contact.

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