KR101078916B1 - Under voltage trip mechanism for mold cased circuit breaker - Google Patents

Under voltage trip mechanism for mold cased circuit breaker Download PDF

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Publication number
KR101078916B1
KR101078916B1 KR1020100025471A KR20100025471A KR101078916B1 KR 101078916 B1 KR101078916 B1 KR 101078916B1 KR 1020100025471 A KR1020100025471 A KR 1020100025471A KR 20100025471 A KR20100025471 A KR 20100025471A KR 101078916 B1 KR101078916 B1 KR 101078916B1
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South Korea
Prior art keywords
trip
circuit breaker
lever
undervoltage
lever mechanism
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KR1020100025471A
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Korean (ko)
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KR20110106198A (en
Inventor
김웅재
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엘에스산전 주식회사
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Abstract

The present invention is to provide a low-voltage trip device of a circuit breaker, in accordance with the present invention; A lever that displaces the normal energized operation position advanced to energize the circuit breaker normally when the normal voltage is energized on the circuit and the undervoltage trip driven position that is retracted to trip the circuit breaker when the undervoltage occurs on the circuit. A coil assembly unit having a pressing portion; A cover having a first spring support COVER; A first operating position installed at an upper portion of the cover and pressed by the lever pressing portion of the coil assembly unit to move in the same direction as the lever pressing portion to normally energize the circuit breaker, and a lever pressing portion of the coil assembly unit to undervoltage trip A trip lever mechanism having a second operating position for retracting the circuit breaker to trip (TRIP) when retracted to a drive position and having a second spring support; And a spring that retracts the elastic energy when the trip lever mechanism is advanced to the first operating position, and retreats the trip lever mechanism to the second operating position by preserving the elastic energy when the lever pressing unit is retracted to the undervoltage trip driving position. ; Disclosed is an undervoltage trip device for a circuit breaker, comprising a.

Description

Undervoltage trip device of circuit breaker {UNDER VOLTAGE TRIP MECHANISM FOR MOLD CASED CIRCUIT BREAKER}

The present invention relates to a circuit breaker, and more particularly, to an undervoltage trip device of a circuit breaker.

In the circuit breaker, the undervoltage trip device is a device that can block (trip) the circuit so as to protect the circuit and damage of the load equipment connected to the circuit due to the instantaneous voltage drop on the circuit. The circuit breaker can be tripped by transmitting a control signal through a control signal line electrically connected to the assembly unit.

The circuit breaker can open and close a relatively low voltage power circuit of several hundred volts or less, and performs a trip operation to automatically cut off the power circuit when an abnormal current flows in the power circuit, thereby causing the load device and the life connected to the power circuit and the power circuit. It is a power device that protects. Such a circuit breaker has a top cover and a lower case forming a large enclosure as well known, a contact that is housed in the lower case and opens and closes a power circuit, and an opening / closing mechanism for providing opening / closing driving force of the contact. A trip bar that triggers the opening and closing mechanism to trip, a trip mechanism that detects abnormal currents such as overcurrent and short circuit current in a power circuit, and operates the trip bar, between contacts in a trip operation. And an arc extinguishing mechanism to extinguish the arc that occurs. In the above, the opening and closing mechanism is a rotating support shaft rotatably supporting the movable contactor, a manual operating handle, a lever providing a rotational support point of the manual operating handle (see numeral 31 of FIG. 5), and a trip driving force of the opening and closing mechanism as is well known. A main spring connected between the manual handle and the upper and lower links, a latch and a latch holder for maintaining or releasing the elastic energy accumulation state of the main spring, and an upper link driven between the latch and the shaft. And a nail for restraining or restraining the lower link, the latch holder, and the like.

The configuration and operation of the undervoltage trip device in such a circuit breaker may refer to Korean Patent Registration No. 0344330 (name of the invention: Undervoltage trip device of a circuit breaker) filed and registered by the applicant of the present invention.

The undervoltage trip device of the circuit breaker according to the related art has a rotational operation structure, which is inconvenient in assembly due to power transmission by a plurality of spring connections, and thus has problems in assembly productivity, and the operation structure of the trip lever is rotated by a plurality of link connections. Since operation structure is incompletely performed, there is a problem that operation reliability is not guaranteed.

In addition, the undervoltage trip device of the circuit breaker according to the prior art is a device specialized for the configuration of the trip lever and the opening / closing mechanism to be suitable for the position and / or configuration of a particular trip bar and the opening / closing mechanism. Since it can not be applied to the location and / or configuration of the trip bar and can be applied only to a limited model, there was a problem in terms of reducing the manufacturing cost by using the parts of the wiring breaker and the use of the corresponding parts.

In addition, a trip bar that triggers the opening and closing mechanism of the circuit breaker to trip and the peripheral portion of the trip lever included in the undervoltage trip device interfere with each other during the reset operation of the circuit breaker, resulting in incomplete reset operation. There was a problem that could be performed.

Accordingly, a first object of the present invention is to provide an undervoltage tripping device for a circuit breaker in which the assembly is easy, the assembly productivity is excellent, and the operation structure of the trip lever can be reliably performed as the slide structure.

A second object of the present invention is to provide an undervoltage trip device of a circuit breaker suitable for common use of an undervoltage trip device in a circuit breaker, which can cope with various switching mechanisms and trip bars.

A third object of the present invention is to provide a circuit breaker which can prevent the reset of the switchgear from being incompletely performed by interference with a part of the undervoltage trip device when the switchgear of the wiring breaker is reset from the trip position to the initial state. It is to provide an undervoltage trip device.

A first object of the present invention is for a circuit breaker having a switch bar and a trip bar for triggering a trip operation of the switch device, wherein the undervoltage trip device of the circuit breaker includes:

BASE;

It is housed in the base and supported by the base. The normal energizing operation position is advanced so that the circuit breaker is normally energized when the normal voltage on the circuit is energized, and the circuit breaker trips when the undervoltage on the circuit occurs. A coil assembly unit (COIL ASSEMBLY UNIT) having a lever urging portion displaced to an undervoltage trip driving position retracted so as to retreat;

A cover (COVER) fixedly installed to cover the coil assembly unit from an upper portion and having a first spring support;

A first operating position installed at an upper portion of the cover and pressurized by a lever presser of the coil assembly unit to linearly advance in the same direction as the lever presser to normally energize the circuit breaker; A trip lever mechanism having a second operating position for linearly retreating the circuit breaker so that the circuit breaker is tripped when the lever pressing unit is retracted to the undervoltage trip driving position; And

One end is supported by the first spring support of the cover, the other end is supported by the second spring support of the trip lever mechanism, and when the trip lever mechanism is advanced to the first operating position, the elastic energy is accumulated and the lever A spring for retreating and driving the trip lever mechanism to the second operation position by preserving the elastic energy accumulated when the pressing unit retracts to the undervoltage trip driving position; It can be achieved by providing an undervoltage trip device of the circuit breaker according to the invention characterized in that it comprises a.

In particular, the assembly productivity aspect of the first object of the present invention can be achieved by the configuration in which the base, coil assembly unit, cover, trip lever mechanism are unitized.

The second object and the third object of the present invention, in addition to the above-described structure, in the undervoltage trip device of the circuit breaker according to the present invention, the trip lever mechanism is the first operating position during the normal current energization on the circuit; The trip lever mechanism has a flat surface such that a surface facing the trip bar of the circuit breaker does not protrude toward the trip bar, so that there is no interference with the trip bar of the circuit breaker when advancing toward the trip bar of the circuit breaker. It can be achieved by providing an undervoltage trip device of the circuit breaker according to the present invention, characterized in that the advancing distance of the circuit breaker does not reach the trip bar of the circuit breaker.

The undervoltage trip device of the circuit breaker according to the present invention has a structure in which the trip lever mechanism is linearly advanced or retracted to pressurize or release the trip bar, so that the operation reliability is excellent and assembled in comparison with the prior art having a plurality of springs and a rotating structure. You can get this handy effect.

In the undervoltage tripping device for a circuit breaker according to the present invention, the trip lever mechanism is constituted by a flat surface such that a surface facing the trip bar of the circuit breaker does not protrude toward the trip bar, and the advance distance of the flat circuit breaker is equal to that of the circuit breaker. Since it is determined that the trip bar does not reach the trip bar, when the trip lever mechanism is advanced toward the trip bar of the circuit breaker for resetting the opening and closing mechanism, there is no interference with the trip bar of the circuit breaker.

In the undervoltage tripping device for a circuit breaker according to the present invention, the trip lever mechanism includes a body portion and an inclined portion extending from the body portion beyond a trip bar of the circuit breaker without contact with each other and at the end of the inclined portion. And a trip lever having a downward extension extending downward from the portion and contacting the trip bar of the circuit breaker in the first operating position of the trip lever mechanism and pressing the trip bar of the circuit breaker in the second operating position of the trip lever mechanism. The circuit does not interfere with the trip lever mechanism and the trip bar when the current is energized, and in the case of undervoltage trip operation, the downward extension presses the trip bar to trigger the circuit breaker to trip reliably. Can be obtained.

In the undervoltage trip device of the circuit breaker according to the present invention, a guide shoe is provided on either one of the trip lever mechanism and the cover so that the trip lever mechanism can slide on the cover. Since the guide rail is provided on the opposite side, the trip lever mechanism can smoothly and reliably operate in the forward position and the retracted position to press the trip bar.

In the undervoltage trip device of the circuit breaker according to the present invention, the spring is composed of a compression spring, so that when the tripping lever mechanism is advanced by moving the lever pressing portion of the coil assembly unit during normal current energization, the elastic energy may be accumulated. When the lever pressurization part is retracted due to the undervoltage generation on the power circuit, the resilient energy is stored to rapidly retreat the trip lever mechanism, thereby quickly pressing the trip bar to trigger the trigger operation.

1 is an exploded perspective view showing the configuration of an undervoltage trip device of a circuit breaker according to a preferred embodiment of the present invention;
2 is a side view showing only the trip lever mechanism of the undervoltage trip device of the circuit breaker according to a preferred embodiment of the present invention;
3 is a front view separately showing only the trip lever mechanism of the undervoltage trip device of the circuit breaker according to a preferred embodiment of the present invention;
Figure 4 is a side view of the assembled state of the undervoltage trip device of the circuit breaker according to a preferred embodiment of the present invention,
5 is a perspective view showing a circuit breaker equipped with an undervoltage trip device according to a preferred embodiment of the present invention with a top cover removed;
FIG. 6 is a perspective view of the wiring breaker equipped with an undervoltage trip device according to a preferred embodiment of the present invention as viewed obliquely from below.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings.

The undervoltage trip device according to the present invention is suitable for being used by being installed in a circuit breaker having a switch bar and a trip bar that triggers the operation of the switch device. As described above, the undervoltage trip device according to the preferred embodiment of the present invention is largely divided into a base 27, a coil assembly unit 26, a cover 25, and a trip. And a lever lever (trip lever mechanism) 29.

The base 27 is a means for receiving and supporting the coil assembly unit 26, and may be composed of an open box component with an open top surface and an empty interior for storage. In addition, the base 27 is provided to support the lever pressing portion 26a and coil extension unit 26a in the longitudinal direction opposite to each other in the longitudinal direction of the lever pressing portion 26a (not shown) so as to move forward and backward. ) Is provided with "U" shaped openings on both sides, and may be composed of a synthetic resin material having electrical insulation. In addition, the base 27 is provided with connection grooves (not shown) on both side lower ends so that the lower extension of the cover 25 can be fitted.

The coil assembly unit 26 is accommodated in the base 27 and supported by the base 27, and is fixed to be magnetized by the coil, which is an electromagnet at the time of current conduction, as is well known in the undervoltage trip device. A core, a movable core movable into a position in contact with the fixed core or a position separate from the fixed core according to the magnetization of the fixed core, a moving shaft connected to the movable core to be movable in the same direction with the movable core, One end of the moving shaft becomes a lever presser 26a to which FIG. 1 can be referred. The lever pressurizing portion 26a has a normal conduction operation position for advancing the circuit breaker for normal energization when the normal voltage on the circuit is energized, and an undervoltage retracted for tripping the circuit breaker for tripping when the circuit undervoltage occurs. Displace to trip drive position. The displacement of the lever pressing portion 26a is movable to move in the same direction with the movable core in accordance with the generation or disappearance of the magnetic attraction force from the fixed core magnetized or demagnetized by the coil as described above. It can be made by the moving shaft connected to the forward or retracted. In FIG. 1, the direction moving to the left direction is the retreat direction of the lever pressing section 26a, and the direction moving to the right direction is the forward direction of the lever pressing section 26a. In the periphery of the lever pressing portion 26a between the end portion of the lever pressing portion 26a and one side of the coil assembly unit 26, as shown in FIGS. 1 and 4, the retracting portion of the lever pressing portion 26a is retracted. A return spring 26a-1 is provided which imparts elastic force to move to one position. Here, in order to prevent separation of the return spring 26a-1, the end portion of the lever pressing portion 26a is formed to have a diameter larger than that of the return spring 26a-1. Therefore, when the fixed core is brought into the element state from the energizing state of the coil by energizing, the lever pressing portion 26a is moved to the retracted position by applying the elastic force of the return spring 26a-1.

The cover 25 is fixedly installed to cover the coil assembly unit 26 from the top and has a first spring support 25a. Preferably, the cover 25 may also be made of a synthetic resin material having electrical insulation. The cover 25 includes a body portion covering the coil assembly unit 26 from an upper portion thereof, and a downward extension portion 25d extending downward from the body portion and fitted into and supported by the connection groove formed at the lower end portion of the outer surface of the base 27. Include. For the connection support, the lower extension 25d has a hook portion 25d1 at the lower end. As shown in FIG. 1, the first spring support 25a protrudes laterally to support the spring 28 from one protruding wall portion protruding upward from one side of the upper surface of the body and the protruding wall portion. And a spring seat portion (unsigned).

The trip lever mechanism 29 is installed in the upper part of the cover 25 so as to be able to move linearly from the upper part of the cover 25, in more detail, to be able to slide. For this slide movement, the trip lever mechanism 29 may be provided with a pair of guide shoes 29i1 and 29i2 which are formed in a predetermined length so as to protrude upward from the upper surface, and the corresponding cover 25 A pair of guide rails 25b1 formed to protrude from the top surface of the cover 25 and to be separated from each other so as to guide and slide the guide shoes 29i1 and 29i2 on the upper surface thereof. , 25b2 and guide rail grooves 25c1 and 25c2 may be provided on one side of the guide rails 25b1 and 25b2 to be recessed inwardly. Here, the guide rail grooves 25c1 and 25c2 are portions into which the guide shoes 29i1 and 29i2 are fitted, and the guide rails 25b1 and 25b2 form the guide rail grooves 25c1 and 25c2. And support. The guide rails 25b1 and 25b2 of the cover 25 are assembled so as to protrude upward through guide slots 29h, which are long holes formed in the upper surface of the trip lever mechanism 29. Moreover, the trip lever mechanism 29 is pressurized by the lever press part 26a of the coil assembly unit 26, and advances in the same direction as the lever press part 26a, and makes a circuit breaker normally energize; The lever presser 26a of the coil assembly unit 26 has a second operation position for retracting the circuit breaker so as to trip the trip when the lever pressurizing portion 26a retreats to the undervoltage trip driving position.

1, the trip lever mechanism 29 is provided on the body portion 29f, the trip lever 29d, the opening and closing mechanism reset action portion 29g, and the body portion 29f. It has a second spring support 29b. The body portion 29f may be made of a synthetic resin material having electrical insulation in the form of a schematic rectangular parallelepiped. A spring support 29a is formed to extend in a "U" shape, which is turned upside down from one side of the body portion 29f, and has a spring support (25) for accommodating the spring 28 and the first spring support 25a therein. Between 29a) and one side of the body portion 29f, an empty accommodation space is provided. The second spring support 29b is provided as a protrusion protruding from one inner wall surface of the spring support 29a.

A power receiving unit (unsigned) is provided extending from the body portion 29f to have a predetermined area downward, and receives the power by the forward movement of the lever pressing portion 26a of the coil assembly unit 26 to provide a trip lever mechanism ( 29). In order to receive the power for the forward movement of the trip lever mechanism 29, the power receiving portion is located on the movement path of the lever pressing portion 26a while facing the free end of the lever pressing portion 26a.

The trip lever 29d is a side view showing only a trip lever mechanism of the undervoltage trip device of the circuit breaker according to the preferred embodiment of the present invention as shown in FIG. 2, the inclined portion 29d-1 and a downward direction. It has the extension part 29d-2. The inclined portion 29d-1 extends from the body portion 29f beyond the trip bar (see reference numeral 30 in FIGS. 5 and 6) of the circuit breaker so that there is no contact with each other (that is, between the trip bar and the inclined portion). The downward extension part 29d-2 extends downward from the end of the inclination part 29d-1, and the trip bar of the circuit breaker at the first operating position (advanced position) of the trip lever mechanism 29 (Fig. 5). And reference numeral 30 in FIG. 6), and presses the trip bar of the circuit breaker in the second operating position (retracted position) of the trip lever mechanism 29 to trigger the trigger operation. In Fig. 2, the length l1 of the inclined portion 29d-1 is preferably provided at a predetermined length that is sufficiently extended so that there is no interference with the trip bar at the time of energizing the normal current on the circuit and also in the positions and configurations of the various trip bars. do.

The opening and closing mechanism reset action portion 29g extends downward from one side portion of the body portion 29f and presses the opening and closing mechanism of the circuit breaker to the reset position (especially the position where the latch and the latch holder are not shown). A pair of connecting parts connected to both sides of the lower portion of the circuit breaker lever (the lower part of the manual operation handle of the circuit breaker) by extending rearward from the upper portion of the reset action portion 29g1 and the reset action portion 29g1. (31) is pressed by the corresponding lever 31 which rotates when it is manually operated to the reset position (OFF position of the manual operation handle of the circuit breaker), thereby receiving the driving force from the lever 31, and the reset action portion 29g1 It has a power receiving portion (29g2) for transmitting to advance. The reset action portion 29g1 advances and presses the opening / closing mechanism to return from the trigger operation position to an initial position (especially, a position where the latch and the latch holder are not shown).

In addition, the movement paths of the reset action portion 29g1 and the power receiving portion 29g2 and the trip paths of the trip lever 29d have different paths so as not to interfere with each other. In addition, since the reset action portion 29g1, the power reception portion 29g2, and the trip lever 29d are integrally connected to each other together with the body portion 29f, and move together, the reset action portion 29g1 and the power reception portion 29g2. ) And the trip lever 29d do not cause any interference during the reset operation.

 When operating the opening and closing mechanism in the reset position, the side of the trip lever which protrudes in the prior art and interfered with the trip bar of the wiring breaker, in the present invention, as shown in FIG. The lever mechanism comprises a flat surface, that is, a flat portion 29e such that a surface facing the trip bar of the circuit breaker does not protrude toward the trip bar, that is, a flat portion 29e, and the forward distance of the flat portion 29e is the trip of the circuit breaker. Decided not to reach the bar.

One end of the spring 28 is supported by the first spring support 25a of the cover 25 and the other end of the spring 28 is supported by the second spring support 29b of the trip lever mechanism 29. In addition, when the trip lever mechanism 29 advances to the first operating position, the spring 28 accumulates elastic energy, and when the lever pressurizing portion 26a retreats to the undervoltage trip driving position, the spring elastic force is accumulated. In return, the trip lever mechanism 29 is retracted to the second operating position (retracted position). The spring 28 preferably consists of a compression spring.

Meanwhile, the assembly of the undervoltage trip device according to the preferred embodiment of the present invention configured as described above is as follows.

First, an assembly of an undervoltage trip device according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 4, and then the undervoltage trip according to a preferred embodiment of the present invention assembled with reference to FIGS. 5 and 6. Assembling the device to the circuit breaker will be described briefly.

As can be seen in FIG. 1, the coil assembly unit 26 is housed in a base 27, which is an open box-shaped component with an open top surface and an empty interior. At this time, the lever pressing portion 26a of the coil assembly unit 26 and opposite end portions of the moving shafts thereof are installed to extend to the outside through the “U” shaped openings formed at both sides of the base 27.

Next, the cover 25 is installed to cover the upper portion of the coil assembly unit 26. At this time, the hook 25d1 formed at the end of the lower extension 25d so that the lower extension 25d of the cover 25 protrudes outside the side of the base 27 is connected to the lower end of the side of the base 27. It is caught in the groove and stopped. Therefore, the cover 25 can be firmly bound to the base 27 and fixed in position while preventing the upward movement from the base 27 of the coil assembly unit 26.

Next, the trip lever mechanism 29 is mounted on the cover 25. At this time, the guide rails 25b1 and 25b2 of the cover 25 are fitted with the trip levers while the guide shoes 29i1 and 29i2 of the trip lever mechanism 29 are inserted into the guide rail groove portions 25c1 and 25c2 of the cover 25. The first spring support 25a of the cover 25 is inserted so as to project upward through the guide slot 29h of the mechanism 29 and is formed in the inner through hole formed by the spring support 29a of the trip lever mechanism 29. The fitting (assembly) of the trip lever mechanism 29 on the cover 25 is completed by inserting the.

Next, the spring 28 is fitted between the first spring support 25a and the second spring support 29b. This simply completes the assembly of the undervoltage trip device of the circuit breaker according to the present invention.

A method of assembling the completed undervoltage trip device to the circuit breaker will be briefly described with reference to FIGS. 5 and 6.

The circuit breaker 10 shown in FIGS. 5 and 6 is a three-phase circuit breaker shown in a state where the top cover is removed in order to facilitate understanding of the invention. The illustrated circuit breaker 10 is provided with three single pole breaking units in the lower enclosure. Here, the single-pole blocking unit is a sealed housing of the movable contactor, the fixed contactor, the rotary support shaft of the movable contactor, and the arc extinguishing mechanism for each phase electrical insulation. The furnace projects only the terminal portion of the fixed contact. Opening / closing mechanism for opening / closing the rotating support shaft of the single-pole blocking unit on the central S-phase single-pole blocking unit among the R-phase, S-phase, and T-phase three-phase single-pole blocking units (manual operation handle and rotation support point of the manual operation handle) A lever 31 for providing a trip spring, a trip spring for providing a trip driving force, a latch, a latch holder, an upper and a lower link, and the like. In FIG. 5, a trip bar 30 is rotatably installed to traverse three-phase single-pole blocking units at a position adjacent to the opening and closing mechanism, and energization of an abnormal current in a circuit is detected at a position adjacent to the right of the trip bar 30. Unsigned trip mechanisms are provided. The assembly of the undervoltage trip device according to the present invention may be installed at the center of the R-phase single-pole blocking unit, and the inclined portion 29d-1 of the trip lever 29d of the trip lever mechanism 29 is tripped to the trip bar 30. ) Is installed to extend beyond the top.

Meanwhile, the operation of the undervoltage trip device of the circuit breaker according to the present invention constructed and assembled as described above will be described with reference to FIGS. 1 to 6.

First, the operation of the undervoltage trip device of the circuit breaker according to the present invention when the normal current on the circuit is energized, the operation when the undervoltage occurs on the circuit and finally the reset operation for the switching mechanism will be described.

When the normal current is energized on the power circuit with the circuit breaker connected, the internal fixed coil of the coil assembly unit 26 is energized by energizing the internal excitation coil of the undervoltage trip device according to the present invention so that the surrounding fixed core is magnetized and operated. As the moving shaft connected to suck the core and move together with the movable core moves, the lever pressing portion 26a which is the right end of the moving shaft in FIG. 1 or 4 moves to the right in the drawing. At this time, the lever pressing portion 26a overcomes the elastic force of the return spring 26a-1 and moves to the right. Accordingly, the end of the lever presser 26a presses one side lower portion of the trip lever mechanism 29 in FIG. 4, so that the trip lever mechanism 29 moves forward and is not in contact with the trip bar 30. It is located at. Also, at this time, as the trip lever mechanism 29 moves toward the trip bar 30 side, the spring 28 is compressed between the second spring support 29b advancing in FIG. 1 and the stopped first spring support 25a. Charging elastic energy.

FIG. 5 shows a state where the trip lever mechanism 29 is located in this first position. Since there is no contact between the trip bar 30 and the trip lever mechanism 29, the trip bar 30 remains stopped at the initial position. Therefore, since there is no trigger action of the opening and closing mechanism, the opening and closing mechanism is not tripped and is fixed with the movable contactor. Normal energization is maintained on the circuit with the contacts in contact.

Next, the operation at the time of undervoltage occurrence on the circuit will be described.

On the power circuit on which the circuit breaker is connected, if an undervoltage condition occurs due to a drop in voltage on the power circuit on which the circuit breaker is connected, the current is decreased in the internal excitation coil of the coil assembly unit 26 among the undervoltage trip devices according to the present invention. And the excitation coil is thus demagnetized, so that the surrounding fixed core is also demagnetized and loses the attraction force to the movable core. Therefore, the movable shaft connected to move together with the movable core is left by the elastic return force of the return spring 26a-1. As shown in FIG. 1 or FIG. 4, the lever pressing portion 26a, which is the right end of the moving shaft, moves to the left in the drawing. Therefore, the pressure at which the end of the lever pressing portion 26a presses one side lower portion of the trip lever mechanism 29 in FIG. 4 disappears, so that the elastic energy stored in the spring 28 as it is tensioned and stored is restrained. 29) is pressed to move to the retracted second position. Thereby, the downward extension part 29d-2 of the trip lever 29d of the trip lever mechanism 29 which moves backward repulsively drives the trip bar 30, and rotates. Therefore, the trip bar 30 is triggered to trip the opening and closing mechanism by rotating from the initial position, and the opening and closing mechanism performs a tripping operation, thereby tripping the movable contactor and the fixed contactor in the monopole blocking unit in FIGS. 5 and 6. This is done so the circuit is cut off.

Next, a reset operation for the opening and closing mechanism is finally described with reference to FIGS. 1 to 6.

After the tripping operation of the circuit breaker 10, the cause of the trip is eliminated, and in order to put the circuit breaker in the on state again, it is required to reset the trip bar 30 and the opening and closing mechanism to the initial position. In order to operate the manual operation handle in the off position, the reset operation is performed. This will be described with reference to the present invention.

When the user operates the manual override handle in the off position for reset, the lever 31 of Fig. 5, which is connected to both lower sides of the manual override handle to provide a rotation point, rotates while the lever 31 of FIG. One side of the undervoltage trip device according to the present invention in the trip lever mechanism 29 to press the power receiving portion (29g2) formed to extend toward the lever (31). Then, the reset action portion 29g1 integrally connected with the power receiving portion 29g2 advances and presses the opening / closing mechanism (especially the latch and the latch holder) from the tripping position to return to the initial position where the latch holder restrains the latch. The reset operation for the switchgear is completed.

10: circuit breaker 25: cover
25a: 1st spring support part 25b1, 25b2: guide rail part
25c1, 25c2: guide rail groove portion 25d: downward extension portion
25d1: hook part
26: Coil Assembly Unit (COIL ASSEMBLY UNIT)
26a: lever pressing portion 26a-1: return spring
27: base 28: spring
29: trip lever mechanism 29a: spring support
29b: 2nd spring support part 29c1, 29c2: guide rail groove part
29d: trip lever 29d-1: inclined portion
29d-2: downward extension 29e: flat portion
29f: body portion 29g: switching mechanism reset
29g1: reset action portion 29g2: power receiving portion
29h: guide slots 29i1, 29i2: guide shoes
30: trip bar 31: lever

Claims (6)

In the circuit breaker for wiring having a switchgear and a trip bar which triggers a tripping operation of the switchgear, In the undervoltage trip device of a circuit breaker,
BASE;
It is housed in the base and supported by the base. The normal energizing operation position is advanced so that the circuit breaker is normally energized when the normal voltage on the circuit is energized, and the circuit breaker trips when the undervoltage on the circuit occurs. A coil assembly unit (COIL ASSEMBLY UNIT) having a lever urging portion displaced to an undervoltage trip driving position retracted so as to retreat;
A cover (COVER) fixedly installed to cover the coil assembly unit from an upper portion and having a first spring support;
A first operating position installed at an upper portion of the cover and pressurized by a lever presser of the coil assembly unit to linearly advance in the same direction as the lever presser to normally energize the circuit breaker; A trip lever mechanism having a second operating position for linearly retracting the circuit breaker to trip (TRIP) when the lever pressing portion is retracted to the undervoltage trip driving position; And
One end is supported by the first spring support of the cover, the other end is supported by the second spring support of the trip lever mechanism, and when the trip lever mechanism is advanced to the first operating position, the elastic energy is accumulated and the lever A spring for retreating and driving the trip lever mechanism to the second operation position by preserving the elastic energy accumulated when the pressing unit retracts to the undervoltage trip driving position; Undervoltage trip device of the circuit breaker, characterized in that comprising a. The method of claim 1,
The trip lever mechanism has a flat surface such that a surface facing the trip bar of the circuit breaker does not protrude toward the trip bar so that the trip lever mechanism does not interfere with the trip bar of the circuit breaker when the trip lever mechanism is advanced for the reset operation of the opening and closing mechanism. And the advancing distance of the corresponding flat surface is determined not to reach the trip bar of the circuit breaker. The method of claim 1,
The trip lever mechanism,
A body portion;
An inclined portion extending from the body portion beyond the trip bar of the circuit breaker without contact with each other, extending downward from the end of the inclined portion, and contacting the trip bar of the circuit breaker at the first operating position of the trip lever mechanism; And a trip lever having a downward extension portion for pressing the trip bar of the circuit breaker in the second operating position of the trip lever mechanism. The method of claim 3,
The trip lever mechanism,
Undervoltage trip device of the circuit breaker, characterized in that it further comprises an opening and closing mechanism reset action extending from the body portion. The method of claim 4, wherein
The opening and closing mechanism reset part,
A reset action portion formed to extend downward from the body portion and movable to a position contacting the opening / closing mechanism of the circuit breaker to be reset and separated from the opening / closing mechanism; And
And a power receiving portion extending from the reset action portion and receiving power for the reset action of the reset action portion by pressing from a lever LEVER that provides a rotation point of the manual operation handle of the circuit breaker. Undervoltage trip device of circuit breaker. The method of claim 1,
Guide shoes are formed to have a predetermined length to project upwardly from the top surface of the trip lever mechanism so that the trip lever mechanism can slide on the cover, the cover being provided from the top surface. The guide rail is provided to protrude, and the undervoltage trip device of the circuit breaker, characterized in that the guide rail groove is formed concave inward on one side of the guide rail so that the guide shoe can be fitted.
KR1020100025471A 2010-03-22 2010-03-22 Under voltage trip mechanism for mold cased circuit breaker KR101078916B1 (en)

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Publication number Priority date Publication date Assignee Title
KR101463048B1 (en) * 2014-01-06 2014-11-18 엘에스산전 주식회사 Shunt trip apparatus for molded case circuit breaker
KR101678001B1 (en) 2014-10-31 2016-11-21 엘에스산전 주식회사 Tripping device of circuit braker
CN114089178A (en) * 2021-11-17 2022-02-25 奔龙自动化科技有限公司 Multi-station circuit breaker comprehensive detection equipment

Citations (4)

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Publication number Priority date Publication date Assignee Title
KR100245190B1 (en) 1998-02-18 2000-02-15 김화중 Oxide compound coated platinum metals vessel
KR100434330B1 (en) 2002-04-25 2004-06-04 엘지산전 주식회사 trip device of short voltage in MCCB
KR100516944B1 (en) 2003-12-26 2005-09-23 엘에스산전 주식회사 Interlocking structure of lead starting under voltage trip gear
KR100848563B1 (en) 2006-12-29 2008-07-25 엘에스산전 주식회사 Circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100245190B1 (en) 1998-02-18 2000-02-15 김화중 Oxide compound coated platinum metals vessel
KR100434330B1 (en) 2002-04-25 2004-06-04 엘지산전 주식회사 trip device of short voltage in MCCB
KR100516944B1 (en) 2003-12-26 2005-09-23 엘에스산전 주식회사 Interlocking structure of lead starting under voltage trip gear
KR100848563B1 (en) 2006-12-29 2008-07-25 엘에스산전 주식회사 Circuit breaker

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