JP2005158456A - Electromagnetic tripping device for circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic tripping device for circuit breaker capable of attaining the miniaturization while keeping the same interrupting timing as in an existing device. <P>SOLUTION: An oil dash pot 1 comprises a screwing groove 20 for giving a rotating motion to a plunger 8 to spirally protrude the plunger 8, the groove being formed on the circumferential surface of the plunger 8 movably housed within a cylinder 7 from the lower end side toward the upper end side. The tip of a projection body 21 installed from the outside is protruded to the inner wall surface of the cylinder 7, and engagingly fitted to the upper end position of the groove 20 in the state where the plunger 8 is in an initial position. According to this, when the plunger 8 is moved upward, the projection body 21 is relatively moved in the groove 20 to give the rotating motion to the plunger 8. Thus, even if the longitudinal dimension of the cylinder 7 is short, the substantial moving time of the plunger 8 can be extended. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic trip device for a circuit breaker using an oil dash pot.

  Conventionally, the circuit breaker has an oil dash pot as a tripping device for tripping the switching mechanism A when an overcurrent or an excessive current during a short circuit flows as a load current as shown in FIG. The electromagnetic tripping device B using 1 is widely adopted. As shown in FIG. 11 (b), this electromagnetic tripping device B joins one end of a horizontal piece to the oil dashpot 1, the coil 2 wound around the outer periphery of the oil dashpot 1, and the oil dashpot 1. An L-shaped yoke 3 in which a vertical piece is arranged in parallel with the oil dash pot 1, an armature 5 whose one end is movably supported by the yoke 3 and is opposed to the pole head 4, and this armature 5 is a pole And a return spring 6 that is biased in a direction away from the head 4.

  Here, as a structure of the conventional example of the oil dash pot 1, there existed what was shown in FIG. 12 (patent document 1). That is, the oil dash pot 1 of this conventional example urges the cylinder 7 downward, and the cylinder 7 made of a non-magnetic material, the plunger 8 made of a magnetic material housed in the cylinder 7 so as to be movable up and down in the figure. The return spring 9 was housed, and braking oil 10 such as silicon oil was sealed, and the upper end opening of the cylinder 7 was sealed with a pole head 4 made of a magnetic material. The oil dash pot 1 shown in FIG. 12 is provided with an intermediate diameter portion at the base of the small diameter portion of the plunger 8 so as to prevent the radial displacement between the return spring 9 and the plunger 8. Yes.

  The coil 2 wound around the oil dash pot 1 has one end connected to the load terminal 11 and the other end connected to the movable contact 12 so that the load current is passed through the power terminal 13, the fixed contact 14 and the movable contact 12. Flows and is excited.

When a large magnetic attraction force is generated by exciting the coil 2 due to an excessive load current, the plunger 8 moves upward against the braking force of the braking oil 10 and the urging force of the return spring 10. 8, the yoke 3, and the armature 5, the magnetic flux flowing in the magnetic path increases, and the armature 5 is attracted and driven by the pole head 4 against the return spring 6 against urging. Then, the latching state of the opening / closing mechanism A is pulled off to perform a trip operation, the movable contact 12 is separated from the fixed contact 14 and the load current is interrupted.
JP-A-10-125206 (FIG. 1 of the accompanying drawings)

  By the way, circuit breakers, particularly those installed on electrical installation panels, are required to be reduced in size to eliminate installation space limitations, or to improve workability through weight reduction. Therefore, it is indispensable to reduce the size of the built-in electromagnetic tripping device itself and to further reduce the size of the oil dashpot. However, if the length of the oil dashpot is shortened or the cylinder diameter is reduced and the same shutoff timing as that of the existing device is to be obtained, the former increases the resistance to the movement of the plunger and increases the movement speed. Need to be late. In the latter case, since the viscous resistance is increased, it is necessary to increase the moving time. On the other hand, if the moving speed is slowed as described above, there is a problem that the operation timing of the amateur, that is, the interruption timing varies.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic trip device for a circuit breaker that can be miniaturized while having the same breaking timing as an existing device. It is in.

  In order to achieve the above-mentioned object, in the invention of claim 1, a plunger is housed in a cylinder in which braking oil is sealed so as to be movable in the axial direction, and the plunger is urged toward one end of the cylinder. An oil dashpot containing a spring, a coil wound around the cylinder outer periphery, a yoke joined to or close to the oil dashpot, and movably locked to the yoke, the other end of the cylinder And an armature facing the pole head of the oil dashpot that seals the side, and the plunger is moved to the other end side of the cylinder by the magnetic attraction force by the excitation of the coil according to the magnitude of the load current flowing through the coil In the electromagnetic tripping device for the circuit breaker to be operated, a moving time changing device for changing the moving time of the plunger is added. It is characterized in.

  According to the invention of claim 1, even if the cylinder length of the oil dash pot of the existing device is shortened or the device is downsized by reducing the inner diameter of the cylinder, the moving time changing device can The movement time of the plunger until reaching the position where the actuator is actuated can be set to the same movement time as the existing device, and as a result, a small circuit breaker electromagnetic trip device with the same interruption time as the existing device can be realized. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the moving time changing device comprises a rotation imparting device that imparts a movement in the rotational direction to the plunger.

  According to the invention of claim 2, it is possible to increase the movement distance by adding a rotational motion to the motion of the plunger. Therefore, even if the cylinder length of the oil dash pot of the existing device is shortened, the existing long cylinder length The amateur can be operated at the same timing as the device.

  According to a third aspect of the present invention, in the second aspect of the present invention, the rotation imparting device includes a screwing groove formed on the inner surface of the cylinder or the outer surface of the plunger, and a tip portion protruding from the outer surface of the plunger or the inner surface of the cylinder. It is comprised by the protrusion which engages.

  According to invention of Claim 3, the structure of the apparatus which gives a rotational motion to a plunger is realizable with a simple structure.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the moving time changing device is disposed at one end or the other end of the cylinder, and is magnetic in a suppression direction or an increase direction with respect to a magnetic attraction force due to excitation of the coil. It is comprised by the permanent magnet which gives an attractive force, It is characterized by the above-mentioned.

  According to the invention of claim 4, even if the cylinder length of the oil dash pot of the existing device is shortened to reduce the size, the movement of the plunger is delayed at the initial stage of energization of the overcurrent, thereby operating the amateur. The movement time of the plunger until reaching the position can be equivalent to that of an existing device having a long plunger length, or the movement of the plunger is increased when the spring force of the return spring is increased to delay the movement time of the plunger. By accelerating at the final position side, it is possible to suppress the variation in the shut-off timing due to slowing down the moving speed of the plunger from the initial position, and to stabilize the shut-off time.

  According to a fifth aspect of the present invention, in the first aspect of the invention, the moving time changing device is separated from one end side of the cylinder and closer to the other end side of the cylinder with respect to a central position in the radial direction of the cylinder. It is characterized by comprising the coil with the winding diameter changed.

  According to the invention of claim 5, even if the cylinder length of the oil dash pot of the existing device is shortened and the size is reduced, the magnetic attraction force due to the excitation of the coil is reduced at the initial position of the plunger movement to move the plunger. By slowing down the speed, the plunger movement time from the initial position to the position where the armature is operated can be made equivalent to that of the existing device, and the magnetic attraction force at the final position is increased to move the plunger. By increasing the speed, it is possible to suppress the variation in the shut-off timing caused by slowing down the moving speed of the plunger from the initial position, and to stabilize the shut-off time.

  According to a sixth aspect of the present invention, in the first aspect of the invention, the moving time changing device is configured by the coil having a coarse winding interval on one end side of the cylinder and a tight winding interval on the other end side of the cylinder. It is characterized by that.

  According to the invention of claim 6, even if the cylinder length of the oil dash pot of the existing apparatus is shortened and the size is reduced, the magnetic attraction force due to the excitation of the coil is reduced at the initial position of the plunger movement to move the plunger. By slowing down the speed, the plunger movement time from the initial position to the position where the amateur is operated can be made equivalent to that of the existing device, and the magnetic attraction force at the final position of the movement is increased to increase the plunger. By increasing the moving speed, the variation in the shut-off timing caused by slowing the moving speed of the plunger from the initial position can be suppressed, and the shut-off time can be stabilized.

  According to a seventh aspect of the invention, in the first aspect of the invention, the moving time changing device is constituted by the cylinder that is divided into two in the longitudinal direction and the inner diameter on the other end side is made larger than the inner diameter on the one end side. Features.

  According to the invention of claim 7, even if the cylinder length of the oil dash pot of the existing apparatus is shortened and the size is reduced, the armature can be moved from the initial position by increasing the viscous resistance of the brake oil on one end side of the cylinder. The movement time of the plunger to reach the operating position can be made equivalent to that of existing devices, and the moving speed at the final position of the plunger movement can be increased by reducing the viscous resistance at the other end. Thus, it is possible to suppress the variation in the cut-off timing due to the slow movement of the plunger from the initial position, and to stabilize the cut-off time.

  Even if the cylinder length of the oil dash pot of the existing device is shortened or the inner diameter of the cylinder is reduced to reduce the size of the device, the moving time changing device operates the armature from the initial position in the cylinder. The movement time of the plunger reaching the position to be moved can be set to the same movement time as the existing device, and as a result, there is an effect that a small circuit breaker electromagnetic trip device having the same interruption time as the existing device can be realized. .

  Embodiments of the present invention will be described below.

(Embodiment 1)
Since the electromagnetic trip device of the present embodiment is the same as the conventional example except for the configuration of the oil dash pot 1, the relationship with the circuit breaker and the configuration other than the oil dash pot 1 are shown in FIGS. ), And the configuration of the oil dash pot 1 as the main part will be described in detail with reference to FIG. In FIG. 1 (a), the excitation coil is not shown.

  The oil dash pot 1 used in the present embodiment is made smaller by shortening the cylinder length compared to the existing one, and is movably accommodated in the cylinder 7 as shown in FIG. On the outer peripheral surface of the plunger 8 is formed a screw groove 20 for rotating the plunger 8 by rotating the plunger 8 in the direction from one end (the lower end in the figure) to the other end (the upper end in the figure). On the other hand, the tip of the projection 21 attached from the outside is projected on the inner wall surface of the cylinder 7, and this tip is engaged with the upper end position of the screw groove 20 with the plunger 8 in the initial position. Yes. Thereby, when the plunger 8 moves upward in the figure, the protrusion 21 relatively moves in the screwing groove 20, thereby giving the plunger 8 a rotational motion. That is, the plunger 8 moves upward while rotating. Thereby, even if the length of the cylinder 7 in the longitudinal direction is short, the movement time of the plunger 8 can be substantially the same as that of an existing device having a long cylinder 7, that is, the screw groove 20 and the protrusion. 21 constitutes a moving time changing device for the plunger 8, and this device can set the moving time from the initial position to the position where the armature 5 is actuated when an overcurrent is applied, in the same manner as in the existing device. . As a result, even if the cylinder length is shortened to reduce the size, an electromagnetic trip device for a circuit breaker having a break time equivalent to that of an existing device can be realized.

  1 is provided with fine irregularities as shown in FIGS. 1B and 1C so that the plunger 8 can move smoothly. You may do it. Further, by providing similar irregularities on the outer surface of the plunger 8 (circle b in FIG. 1), the plunger 8 can be moved smoothly by reducing the contact area with the inner surface of the cylinder 7 or functioning as an oil reservoir. Anyway.

  In the oil dashpot 1 shown in FIG. 1, one set of the protrusion 21 and the screw groove 20 is provided, but three or two sets may be provided on the axis object. FIG. 2 shows a cross-sectional structure of the three oil dash pots 1 provided.

  The protrusion 21 may be provided not on the cylinder 7 side but on the plunger 8 side, and the screwing groove 20 may be provided on the cylinder 7 side instead of the plunger 8 side.

 Further, in the example shown in FIGS. 1 and 2, the protrusion 21 made of a member separate from the cylinder 7 is used. However, as shown in FIGS. 3A and 3B, a part of the cylinder 7 is plastically deformed. The protrusions 21 may be formed by projecting into the cylinder 7, and in this case, the protrusions 21 as separate members are unnecessary, and work such as attachment is not necessary.

  Further, when the protrusion 21 is provided on the plunger 8 side, a groove formed by deforming or cutting the inner wall surface of the cylinder 7 is used as the screwing groove 20 on the cylinder 7 side as shown in FIG. May be.

  Further, when the protrusion 21 is provided on the cylinder 7 side, as shown in FIGS. 4A and 4B, the cylindrical body 70 made of a nonmagnetic material for fitting the protrusion 21 into the recess 70a formed at the upper end. It is good also as a structure inserted in the one end side in the cylinder 7. In this case, the protrusion 21 can be easily formed. The gap between the inner peripheral surface of the oil dash pot 1 and the outer peripheral surface of the plunger 8 is a gap with the inner peripheral surface of the cylindrical body 70 on the initial position side, which is one end side (hereinafter referred to as the lower end side) of the cylinder 7. Since a gap with the inner peripheral surface of the cylinder 7 is provided at a position above the cylinder 70, the viscous resistance of the brake oil 10 is reduced above the cylinder 70, and as a result, the speed of the plunger 8 can be increased. That is, when the moving speed is slowed down, the timing at which the armature 5 is actuated by the magnetic force of the plunger 8, that is, the shut-off timing may vary. By operating the amateur 5 promptly, it is possible to absorb and suppress variations in the shut-off timing.

(Embodiment 2)
The electromagnetic tripping device of the present embodiment is a device for changing the movement time of the plunger 8, as shown in FIG. 5 (a), or the other end as shown in FIG. 5 (b). You may comprise by the cyclic | annular permanent magnet 22 attached to the outer periphery of an end side (henceforth upper end side).

  In other words, in the former configuration, by setting the magnetic pole direction of the permanent magnet 22 so as to suppress the magnetic attractive force due to the excitation of the coil 2, the moving speed of the plunger 8 at the initial stage of overcurrent energization can be reduced and the moving time can be reduced. The movement time from the initial position to the position where the plunger 5 is actuated is delayed so that the moving time is the same as that of the existing device having a long cylinder length, and the spring force of the return spring 9 is made weaker than that of the existing device. Thus, by increasing the moving speed of the plunger 8 in the vicinity of the final position as compared with the existing device, the armature 5 is actuated quickly in the same manner as described above, and the variation in the cut-off timing is absorbed and suppressed.

  On the other hand, in the latter configuration, the spring force of the return coil 9 is made larger than that of the existing device, and the movement time from the initial position to the position where the plunger 5 operates the armature 5 is delayed to make the movement time longer. By setting the magnetic pole direction of the permanent magnet 22 so as to increase the magnetic attractive force when the coil 2 is excited, the moving speed at the final position (near the upper end) of the plunger 8 is increased. In the same manner as described above, the armature 5 is actuated quickly to absorb and suppress the variation in the cut-off timing.

  For the relationship with the circuit breaker and the configuration other than the oil dash pot 1, refer to FIGS. 11 (a) and 11 (b).

(Embodiment 3)
In the present embodiment, as shown in FIG. 6, an annular permanent magnet 22 is provided on the upper end side of the cylinder 7 in the same manner as the configuration shown in FIG. 5B of the second embodiment, and a cylinder directly below the permanent magnet 22. The magnetic body 23 protrudes from the side surface 7 so as to be parallel to the armature 5, and the tip 23 a of the magnetic body 23 protrudes upward so as to be close to the lower surface in the vicinity of the pivotal support portion of the armature 5. That is, the permanent magnet 22, the magnetic body 23, and the amateur 5 constitute a closed magnetic circuit.

  Thus, in this embodiment, the magnetization direction of the permanent magnet 22 is set so that the magnetic attraction of the permanent magnet 22 is increased when the coil 2 is excited, as in the embodiment of FIG. Thus, the moving speed of the plunger 8 at the final position (near the upper end) can be increased to change the moving time of the plunger 8. In particular, when the magnetic flux of the permanent magnet 22 flows in the magnetic path, the magnetic force of the permanent magnet 22 works effectively, and the moving speed of the plunger 8 can be made faster than in the case of FIG. As a result, the armature 5 is actuated quickly, and the variation in the shut-off timing is further suppressed. In order to make the movement time of the plunger 8 from the initial position to the position where the armature 5 is operated equivalent to that of the existing one, the spring force of the return spring 9 is made larger than that of the existing device.

  The yoke 3 has one end of a horizontal piece connected to the lower part of the cylinder 7 of the oil dash pot 1 in the same manner as the conventional configuration shown in FIG. 11 (b), and pivotally supports the armature 5 at the upper end of the vertical piece. One end of the coil 2 is connected to the load terminal 11 provided on the lower back surface of the piece. The armature 8 is urged by the return spring 6 so that the tip of the armature 8 is separated from the pole head 4 of the oil dash pot 1.

  In addition, suppose that a related structure with a circuit breaker refers to Fig.11 (a).

(Embodiment 4)
As shown in FIG. 7, the electromagnetic tripping device of the present embodiment uses a coil 2 formed so as to gradually widen the winding diameter from the upper end side to the lower end side of the cylinder 7 as the moving time changing device of the plunger 8. The distance between the center in the diameter direction of the cylinder 7 and the coil wire of the coil 2 is small on the other end side and larger on the one end side. That is, when the plunger 8 is located at the lower end side (initial position side) of the cylinder 7, the plunger 8 exists at a position away from the coil 2, so that the magnetic flux density of the coil 2 at this position is reduced and the plunger 8 is moved. As the plunger 8 moves to the upper end side (final position side) of the cylinder 7, the distance between the plunger 8 and the coil 2 decreases, and the magnetic flux density of the coil 2 increases and passes through the plunger 8. Magnetic flux increases. That is, at the lower end side of the cylinder 7, that is, at the initial position of the plunger 8, the magnetic attraction force with respect to the plunger 8 is minimum and at the upper end side is maximum.

  Thus, in this embodiment, the magnetic attraction force generated by the excitation of the coil 2 is increased from the lower end side of the cylinder 7 to the other end side, thereby slowing the moving speed of the plunger 8 at the initial position (near the lower end). The movement time of the plunger 8 up to the position at which the armature 5 is operated is made equal to that of the existing device, and the movement time of the plunger 8 is changed by increasing the movement speed at the final position (near the upper end). In the same manner as described above, the armature 5 is actuated promptly to absorb and suppress the variation in the cut-off timing.

For the relationship with the circuit breaker and the configuration other than the oil dash pot 1, refer to FIGS. 11 (a) and 11 (b).
(Embodiment 5)
In the fourth embodiment, the coil 2 is used as a moving time changing device by changing the winding diameter of the coil 2 between the lower end side and the other end side of the cylinder 7, but in this embodiment, as shown in FIG. 7 is a moving time changing device using a coil 2 having a coarse winding interval on the lower end side, a little dense in the middle, and a dense winding interval on the upper end side of the cylinder 7. That is, the winding turn of the coil 2 is coarse on the lower end side (initial position side) of the cylinder 7, so that the ampere turn is small, and conversely, on the upper end side of the cylinder 7, the ampere turn is large because the winding interval is close. As a result, the magnetic attractive force acting on the plunger 8 becomes larger at the upper end side than at the lower end side of the cylinder 7.

  Thus, also in this embodiment, the magnetic attraction force generated by the excitation of the coil 2 is increased from the lower end side of the cylinder 7 to the other end side, thereby slowing the moving speed of the plunger 8 at the initial position (near the lower end). The movement time of the plunger 8 up to the position at which the armature 5 is operated is made equal to that of the existing device, and the movement time of the plunger 8 is changed by increasing the movement speed at the final position (near the upper end). In the same manner as described above, the armature 5 is actuated promptly to absorb and suppress the variation in the cut-off timing.

For the relationship with the circuit breaker and the configuration other than the oil dash pot 1, refer to FIGS. 11 (a) and 11 (b).
(Embodiment 6)
In the fifth embodiment, the ampere turn on the lower end side (initial position side) of the cylinder 7 is made small by using the coil 2 having a winding interval coarse on the lower end side of the cylinder 7 and dense on the upper end side. Although the ampere turn on the side (final position side) is increased, in this embodiment, as shown in FIG. 9, the number of winding layers is one layer on the lower end side (initial position side) of the cylinder 7 and on the intermediate position. The moving time changing device is configured by using the coil 2 configured to increase the ampere turn from the lower end side to the upper end side of the cylinder 7 by forming two layers and further forming three layers on the upper end side (final position side).

  Thus, in this embodiment as well, as in the fifth embodiment, the magnetic attraction force generated by the excitation of the coil 2 is increased from the lower end side to the upper end side of the cylinder 7, so that the plunger 8 is at the initial position (near the lower end). Change the movement time of the plunger 8 by slowing the movement speed and making the movement time of the plunger 8 to the position where the armature 5 is operated equivalent to the existing device, and further increasing the movement speed at the final position (near the upper end). As a result, the armature 5 is actuated quickly in the same manner as described above, and the variation in the cut-off timing is absorbed and suppressed.

For the relationship with the circuit breaker and the configuration other than the oil dash pot 1, refer to FIGS. 11 (a) and 11 (b).
(Embodiment 7)
In the present embodiment, the cylinder length is shortened to reduce the size, but as shown in FIG. 10, the upper part is divided into two parts, and the inner diameter of the lower part 7a corresponding to the lower end side is set to the upper part corresponding to the other end side. The cylinder 7 is formed to be smaller than the inner diameter of 7b, and the viscous resistance received from the braking oil 10 when the plunger 8 is moved is reduced at the upper portion 7b. The cylinder 7 constitutes a moving time changing device.

  Thus, in the present embodiment, the movement time of the plunger 8 to the position where the armature 5 is actuated by slowing the movement speed of the plunger 8 in the lower part 7a by a large viscous resistance is made equal to that of the existing device. In the upper part 7b, by reducing the viscous resistance, and further increasing the moving speed at the final position (near the upper end), the armature 5 is actuated quickly in the same manner as described above, and the variation in the cut-off timing is suppressed. It is.

  In addition, by dividing the upper and lower parts into two parts using a material that does not easily pass the magnetic flux of the coil 2, and using an upper part that easily passes the magnetic flux of the coil 2, the moving speed of the plunger 8 is slow at the initial position. You may make it quick at the last position.

  In FIG. 10, the coil 2 is omitted. Further, the relationship with the circuit breaker and the configuration other than the oil dash pot 1 will be described with reference to FIGS.

The oil dashpot used for Embodiment 1 is shown, (a) is side sectional drawing, (b), (c) is explanatory drawing of the principal part same as the above. It is a plane sectional view which can expand the example of another oil dashpot same as the above. (A) is a side sectional view of a cylinder used in another example of the oil dash pot of the above, (b) is an enlarged side sectional view of a part of the cylinder of (a) which can be omitted, and (c) is the other of the above. It is an expanded sectional side view which can abbreviate | omit a part of cylinder used for the example of this oil dashpot. , (A) is an enlarged perspective view in which a part of a cylinder inserted into a cylinder used in another example of the oil dash pot is omitted, and (b) is a side sectional view of the cylinder. (A) is a sectional side view of an example of the oil dashpot used for Embodiment 2, (b) is a sectional side view of another example of the oil dashpot used for the same. FIG. 6 is a side view of a third embodiment, in which a part is broken. It is a sectional side view of the oil dashpot of the state which wound the coil used for Embodiment 4. It is a sectional side view of the oil dashpot of the state which wound the coil used for Embodiment 5. FIG. It is a sectional side view of the oil dashpot of the state which wound the coil used for Embodiment 6. FIG. FIG. 10 is a side cross-sectional view of an oil dash pot used in Embodiment 7. (A) is a side sectional view of an example of a circuit breaker using an electromagnetic trip device, (b) is an enlarged perspective view of an electromagnetic trip device used for the circuit breaker same as above. It is a sectional side view of the oil dash pot of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil dash pot 4 Pole head 7 Cylinder 8 Plunger 9 Returning spring 10 Braking oil 20 Screwing groove 21 Projection body

Claims (7)

An oil dashpot that houses a plunger movably in the axial direction in a cylinder that encloses braking oil and a return spring that urges the plunger toward one end of the cylinder, and is wound around the outer periphery of the cylinder. An arm that is joined to or close to the oil dashpot, and that is movably locked to the yoke and that opposes the pole head of the oil dashpot that seals the other end of the cylinder. And an electromagnetic trip device for a circuit breaker that moves the plunger to the other end side of the cylinder by a magnetic attractive force generated by excitation of the coil according to the magnitude of the load current flowing in the coil. An electromagnetic trip device for a circuit breaker comprising a moving time changing device for changing The electromagnetic trip device for a circuit breaker according to claim 1, wherein the moving time changing device comprises a rotation applying device for applying a movement in a rotating direction to the plunger. The rotation applying device includes a screwing groove formed on a cylinder inner surface or a plunger outer surface, and a protrusion that protrudes from the plunger outer surface or the cylinder inner surface and engages a tip portion of the screw groove. An electromagnetic trip device for a circuit breaker according to claim 2. The moving time changing device is arranged at one end or the other end of a cylinder, and is composed of a permanent magnet that applies a magnetic attractive force in a suppressing direction or an increasing direction with respect to a magnetic attractive force generated by excitation of the coil. An electromagnetic trip device for a circuit breaker according to claim 1. The moving time changing device is configured by the coil that changes the winding diameter so as to be separated from one end side of the cylinder and closer to the other end side of the cylinder with respect to the radial center position of the cylinder. 2. An electromagnetic trip device for a circuit breaker according to claim 1, wherein 2. The circuit breaker according to claim 1, wherein the moving time changing device is configured by the coil having a coarse winding interval on one end side of the cylinder and a dense winding interval on the other end side of the cylinder. Electromagnetic trip device. 2. The circuit breaker according to claim 1, wherein the moving time changing device is constituted by the cylinder divided into two in the longitudinal direction and having an inner diameter on the other end side larger than an inner diameter on the one end side. Removal device.

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