JPH04337224A - Trip device for circuit breaker - Google Patents

Abstract

PURPOSE:To reset the plunger of a release type electromagnet to the original position in a short time after a trip action without using a handle, simplify the combination structure with the internal electric parts of a circuit breaker, and prevent the occurrence of the malfunction of the electromagnet. CONSTITUTION:When an overcurrent is detected or a leak is detected, an electromagnet 22 is operated, a plunger 23 is protruded, a trip lever 24 is rotated in the direction of an arrow C, a main body structure section 14 is tripped, and a cross bar 30 is rotated in the direction of an arrow F. A reset lever 27 is rotated in the direction of an arrow D by the second hook section 30b of the cross bar 30, the trip lever 24 is rotated in the direction opposite to the arrow C by a press section 27b, and the protruded plunger 23 is moved to the original retreated position by the press section 24c of the trip lever 24.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripping device for a circuit breaker that trips a main body mechanism based on the operation of a release type electromagnet when an overcurrent or leakage occurs in a main circuit.

0003

2. Description of the Related Art Conventionally, earth leakage circuit breakers and electronic circuit breakers have been equipped with a tripping device that trips a main body mechanism when a leakage or overcurrent occurs in the main circuit. Conventionally, some tripping devices use so-called release type electromagnets. A specific example is shown in FIG.

[0004] In the figure, a trip rod 1 is attached to a trip member (not shown), and when the trip rod 1 is operated, the main body mechanism is tripped. In order to operate the trip rod 1, a release type electromagnet 2 is provided, and a plunger 2a of this electromagnet 2 is normally held in a retracted position shown by a solid line. One end 4a of a link 4 that rotates around a pin 3 is connected to the plunger 2a.

[0005] On the other end 4b side of this link 4,
Sliding plate 5 movable in the direction of arrow A and the opposite direction
is provided, and this sliding plate 5 is always urged in the direction of arrow A by a spring 6. One end 5a of this sliding plate 5
can be engaged with the trip rod 1, and this sliding plate 5 is locked in the illustrated state by an electromagnet 2 against the spring force of a spring 6. In this case, the electromagnet 2 is in a state where a permanent magnet (not shown) attracts and holds the plunger 2a.

[0006] When a current leakage or an overcurrent occurs in the main circuit, the electromagnet 2 is energized and excited, that is, operates to form a repelling magnetic field against the permanent magnet and release the plunger 2a from being attracted to the plunger 2a. Then link 4
is free to rotate, the lock on the sliding plate 5 is released, the sliding plate 5 is moved in the direction of arrow A by the spring force of the spring 6, and the sliding plate 5 moves the trip rod 1. activated. As a result, the main body mechanism trips and the main circuit is cut off. At this time, due to the movement of the sliding plate 5 in the direction of arrow A, the plunger 2a is moved to protrude rightward in the figure via the link 4.

After this, in order to turn on the main circuit, since the plunger 2a remains protruding, it is necessary to return it to its original retracted position. In this conventional configuration, by operating the handle 7 in the direction of arrow B, the convex portion 8a of the handle receiver 8 is removed.
By moving the receiving part 5b of the sliding plate 5 in the same direction,
is engaged with the convex portion 8a, thereby moving the sliding plate 5 in the direction opposite to the direction of arrow A. As a result, the plunger 2 is reset to its original retracted position via the link 4.

[0008]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional configuration, the movement of the handle receiver 8 is used to reset the plunger 2a of the electromagnet 2. It is necessary to provide

However, it is necessary to provide electrical parts such as an auxiliary switch, an alarm switch, and a circuit board near the handle receiver 8, which makes it difficult to layout the internal structure in consideration of their combination, and furthermore, the structure becomes complicated. Become. In addition, since the plunger 2a of the electromagnet 2 remains in a protruding state, there is a risk that metal powder generated when a large current is cut off may adhere to the plunger 2a and enter the electromagnet 2, causing the electromagnet 2 to malfunction. There is a risk of triggering.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to be able to reset the plunger of a release type electromagnet to its original position in a short time after a tripping operation and without using a handle, thereby preventing the internal electrical components of the circuit breaker from collapsing. It is an object of the present invention to provide a tripping device for a circuit breaker which can simplify the combination structure of the circuit breaker and prevent the electromagnet from causing malfunction.

[Configuration of the invention]

0012

[Means for Solving the Problems] The circuit breaker tripping device of the present invention includes a release type electromagnet that normally holds a plunger in a retracted position and is activated to project the plunger when an overcurrent or leakage is detected. , a trip lever that rotates in a predetermined direction based on the operation of the electromagnet to trip the main body mechanism; a crossbar that rotates in conjunction with the tripping operation of the main body mechanism; and a reset lever that moves the plunger to a retracted position by rotating the trip lever in a direction opposite to the predetermined direction.

[0013]

According to the above means, when the electromagnet is activated when overcurrent or leakage is detected, the plunger of the electromagnet is projected, the trip lever is rotated in a predetermined direction, and the main body mechanism is tripped. Along with this tripping operation, the crossbar rotates in the direction of opening the circuit. In conjunction with the crossbar, a reset lever rotates the trip lever in a direction opposite to the predetermined direction, and the trip lever moves the protruding plunger to its original retracted position. Therefore, when the tripping operation is completed, the plunger of the electromagnet is reset to the original retracted position, and after the tripping operation, the plunger can be reset to the original position within a short time and without using the handle. Can be done.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. First, in FIGS. 5 and 6, the main body case 11 is provided with a handle 12, and a handle receiver 12a is provided inside. Further, a frame 13 of a tripping device is provided inside the main body case 11, and a trip member 15 constituting a part of the main body mechanism section 14 (only a part is shown) is attached to the shaft 16.
It is attached so that it can rotate around the center.

A trip rod 15a is attached to the lower part of the trip member 15, as shown in FIGS. 1 and 2. The trip member 15 is urged to rotate counterclockwise in FIG. 1 by a torsion spring 17. Further, the catch receiver 18 constituting a part of the main body mechanism section 14 is rotatably supported by a shaft 19, and is biased to rotate clockwise in FIG. 1 by a torsion spring 20. portion is locked to the trip member 15. One end of the catch 21 is locked to this catch receiver 18.

The release type electromagnet 22 is attached to the frame 13 and has a permanent magnet inside, and in the state shown in FIG. be.

The trip lever 24 has an intermediate portion rotatably supported on the frame 13 by a shaft 25, and is connected between a protrusion 24a formed on the upper part of the trip lever 24 and a spring hook 13a formed on the frame 13. A tension spring 26 tensioned in
is biased to rotate in the direction of arrow C (clockwise) in FIG. An engaging portion 24b and a pressing portion 24c are formed at the lower part of the trip lever 24, of which the engaging portion 2
4b engages with the engagement pin 23a of the plunger 23, and is prevented from rotating in the direction of arrow C.
4c faces the trip rod 15a.

The reset lever 27 has an upper end rotatably supported on the frame 13 by a shaft 28 above the trip lever 24, and has a pair of arm portions 27a, 2.
7a extends downward. A pressing portion 27b is formed in the middle of each arm portion 27a so as to face the trip lever 24. Further, a tension spring 29 with a small spring force is tensioned between the lower part of each arm part 27a and a spring hanging part 13b formed on the frame 13, and the reset lever 27 is moved by the tension spring 29 shown in FIG. It is rotationally biased in the D direction (counterclockwise).

An engaging portion 27c is formed at the lower end of each arm portion 27a, and this engaging portion 27c connects to the first and second locking portions 30a formed on the rotatable cross bar 30. , 30b. In the state shown in FIG. 1, each engaging portion 27c of the reset lever 27 is locked to the first locking portion 30a of the cross bar 30, and rotation in the direction of arrow D is prevented.

The cross bar 30 is configured to rotate in accordance with the operation of the main body mechanism 14, and as the cross bar 30 rotates, it causes the movable contact 31 to approach and separate from a fixed contact (not shown).

Primary conductor 32 connected to movable contact 31
As shown in FIG. 5, there is provided an earth leakage detector 33 consisting of a zero-phase current transformer and an overcurrent detector 34 consisting of a current transformer. When detected, the electromagnet 22 is energized.

Next, the operation of the above configuration will be described. Figure 1
In the state shown in , the plunger 23 of the electromagnet 22 is attracted to the permanent magnet and is in the retracted position, and although the trip lever 24 is receiving rotational force in the direction of arrow C by the tension spring 26, It is locked in the state shown.

Now, when a leakage or overcurrent is detected in the leakage detector 33 or the overcurrent detector 34,
The electromagnet 22 is energized and energized, forming a magnetic field with a polarity that repels the permanent magnet, and the plunger 23 is released from its attraction and retention and protrudes, thereby causing the trip lever 24 to receive the spring force of the tension spring 26. rotates about the shaft 25 in the direction of arrow C. Along with this, the trip lever 24
The trip rod 15a of the trip member 15 is pressed in the direction of arrow C by the pressing portion 24c. Trip member 15
is rotated in the direction of arrow E around the shaft 16 by being pressed in the direction of arrow C.

FIG. 3 shows a state in which the trip member 15 is in the middle of rotation and immediately before the trip operation. At the moment when the trip member 15 is further rotated in the direction of arrow E from the state shown in FIG.
The lock between the and the catch 21 is released, and the main body mechanism section 14 is thereby tripped. With this tripping operation, the crossbar 30 rotates in the direction of arrow F in FIG. 3 (opening direction), the movable contact 31 separates from the fixed contact, and the main opening is interrupted.

Further, as the cross bar 30 rotates in the direction of the arrow F, the second locking portion 30b is rotated as shown in FIG.
comes into contact with each engaging portion 27c of the reset lever 27 and presses it in the direction of arrow F. Then, the reset lever 27 is rotated in the direction of the arrow D around the shaft 28, and accordingly, each pressing portion 27b pulls the trip lever 24 and rotates in the direction opposite to the arrow C against the spring force of the spring 26. You will be able to do it. As a result, the pressing portion 24c of the trip lever 24 presses the plunger 23 of the electromagnet 22 to the right in FIG. 4, and the plunger 23 is returned to its original retracted position.

As described above, according to this embodiment, when the tripping operation is completed, the plunger 23 of the electromagnet 22 is reset to the original retracted position. Therefore, after the tripping operation, the plunger 23 can be reset to its original position within a short time and without using the handle receiver 12a. As a result, there is no need to provide components of the tripping device near the handle receiver 12a, and therefore the combination layout with auxiliary switches, alarm switches, and electrical components such as circuit boards that would normally be provided near the handle receiver 12a is eliminated. This makes the structure easier. In addition, since the plunger 23 of the electromagnet 22 does not remain in a protruding state, there is no risk of metal powder generated when interrupting a large current adhering to the plunger 23, and the electromagnet 22
2 may cause malfunction.

[0027]

Effects of the Invention As is clear from the above description, the present invention utilizes a crossbar that rotates with the tripping operation to trigger the electromagnetic plunger via the reset lever after the main body mechanism is tripped. Since it is returned to its original retracted position, the plunger of the electromagnet can be reset to its original position in a short time after tripping and without using the handle, making it easy to combine with the circuit breaker's internal electrical components. This has the excellent effect of simplifying the configuration and preventing the electromagnet from malfunctioning.

[Brief explanation of drawings]

[Fig. 1] A side view of essential parts showing an embodiment of the present invention.

[Figure 2]
Plan of main part

[Figure 3] Side view of the main parts in the state immediately before tripping operation

[Figure 4
】Side view of the main parts after the trip operation is completed

[Figure 5] Broken side view showing the whole

[Figure 6] Broken plan view showing the whole

[Figure 7] A diagram equivalent to Figure 6 showing the conventional configuration

[Explanation of symbols]

12 is a handle, 14 is a main mechanism, 15 is a trip member, 22 is a release type electromagnet, 23 is a plunger, 24 is a trip lever, 27 is a reset lever, 30 is a cross bar, 30a, 30b are first and second A locking portion, 33 is a leakage detector, and 34 is an overcurrent detector.

Claims (1)

[Claims] [Claim 1] A release type electromagnet that normally holds the plunger in a retracted position and is activated to project the plunger when an overcurrent or leakage is detected; A trip lever for tripping a mechanism section, a crossbar rotating in accordance with the tripping operation of the main body mechanism section, and rotating the trip lever in a direction opposite to the predetermined direction in conjunction with the crossbar. and a reset lever for moving the plunger to a retracted position.