KR102018874B1 - Trip device of molded case circuit breaker - Google Patents

Trip device of molded case circuit breaker Download PDF

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Publication number
KR102018874B1
KR102018874B1 KR1020150045646A KR20150045646A KR102018874B1 KR 102018874 B1 KR102018874 B1 KR 102018874B1 KR 1020150045646 A KR1020150045646 A KR 1020150045646A KR 20150045646 A KR20150045646 A KR 20150045646A KR 102018874 B1 KR102018874 B1 KR 102018874B1
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KR
South Korea
Prior art keywords
contact surface
shaft
contact
trip
adjustable trip
Prior art date
Application number
KR1020150045646A
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Korean (ko)
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KR20160117056A (en
Inventor
윤대영
김덕중
박도현
Original Assignee
현대일렉트릭앤에너지시스템(주)
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Priority to KR1020150045646A priority Critical patent/KR102018874B1/en
Publication of KR20160117056A publication Critical patent/KR20160117056A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide
    • H01H73/303—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide with an insulating body insertable between the contacts when released by a bimetal element

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Abstract

The thermally adjustable trip device for a circuit breaker according to the present invention includes a bimetal, a contact member provided on one side of the bimetal, and a bimetal deformed at a predetermined distance from the contact member so as to operate when the contact member is pushed. It includes an adjustment trip shaft, the adjustable trip shaft is provided with a contact surface having a plurality of planes of different heights in the direction of the contact member in a position where the contact member is spaced apart from the contact, it is configured to adjust the distance to the contact member, The rated current value range can be set more easily, and the error range can be minimized to improve the reliability of the circuit breaker.

Description

Thermal adjustable trip device of circuit breaker {TRIP DEVICE OF MOLDED CASE CIRCUIT BREAKER}

The present invention relates to a circuit breaker, and more particularly, to a thermally adjustable trip device of a circuit breaker for adjusting a trip time.

In general, Molded Case Circuit Breaker (MCCB) is an auto shut-off function that automatically cuts off the current in case of an accident such as grounding or short-circuit in case of transmission, substation or electric circuit by using electromagnet or bimetal. And, it has a manual cutoff function that can switch the electric line to the open or closed state by the user's operation.

Such a circuit breaker protects the load device and the line by cutting off the circuit when an overload or short circuit occurs in the line.

1 is a cross-sectional view showing the internal structure of a circuit breaker.

Referring to FIG. 1, the circuit breaker for the wiring is largely composed of the trip device 100, the opening / closing mechanism 200, the switch unit 300, and the arc extinguishing unit 400.

The trip device 100 is configured to have a function of blocking a circuit by detecting an abnormal current and an accident current such as an overcurrent, and is largely comprised of a bimetal 110, a trip adjustment bolt 120, and a adjustable trip shaft 150. . The trip device 100 will be described below with reference to FIGS. 2 to 4.

The opening / closing mechanism 200 has a function of mechanically turning on / off the converter, and is connected to the handle 210 and a handle 210 capable of opening and closing a circuit by a pushing or pulling operation, and the handle 210. A lever 220 providing a rotational support (not shown).

The switch unit 300 includes a fixed contactor 310 and a movable contactor 320 to which a power source and a load are connected. The fixed contactor 310 is fixed to a case and connected to an input side power source. It is installed to be separated from or contact with the fixed contact 310 is connected to the load side power.

Here, the movable contact 320 is manually operated by the lever 220, or is operated by the opening and closing mechanism 200 triggered by the trip device 100.

The arc extinguishing unit 400 is configured to insulate the moving path between the fixed contact 310 and the movable contact 320 of the switch unit 300 or the movable contact 320 to improve the breaking performance of the circuit breaker.

That is, when an accident current is generated, when the movable contact 320 is separated from the fixed contact 310 to trip the circuit to protect the circuit, the insulation in the air is destroyed by the current between the contacts and the plasma is heated. An arc is generated. In addition, the arc may be generated by melting an insulator or the like by the arc to generate gas. At this time, the arc extinguishing unit 400 divides and cools the generated arc, and discharges the arc pressure to the outside.

The circuit breaker configured as described above has one-sheet and forward-sheet characteristics when viewed mainly from circuit breakage.

One sheet characteristic refers to an overcurrent trip characteristic having an operation time inversely proportional to the overcurrent value. Such one-sheet characteristics include a thermal electron type using a thermal element such as bimetal and a fully electronic type using a braking action of ODP (Oil Dash Pot).

On the other hand, the forward seating characteristic means that the breaker is quickly tripped by a relatively large overcurrent such as a short circuit current.

Here, when looking at the one-sheet characteristic, the one-sheet characteristic trips the breaker before the temperature reaches a dangerous state due to joule heat when the overcurrent flows over the rated current.

In terms of protection, the breaker should work quickly, but in the converter there is a transient overcurrent, such as the starting current of the motor, in addition to the normal load current. Therefore, it is better to operate with time delay within the range that the temperature of the converter does not exceed the allowable temperature so that the circuit breaker is not operated by such overcurrent. This is called the demonstration operation characteristic.

Determining the time delay in the demonstration operation characteristics corresponds to the time from when the overcurrent flows and the bimetal 110 starts to bend until the opening / closing mechanism 200 is operated by the rotation of the adjustable trip shaft 150.

This delay time is the initial setting interval (gap) of the bimetal 110 and the adjustable trip shaft 150, the rotation of the adjustable trip shaft 150 from the time when the bimetal 110 is in contact with the adjustable trip shaft 150. Therefore, the rotation distance of the adjustable trip shaft 150 until the start of the opening / closing mechanism 200 is determined as an important factor.

Now, the main configuration and problems of the trip device 100 will be described with reference to FIGS. 2 to 4, with the initial gap set between the bimetal 110 and the adjustable trip shaft 150.

 2 is a perspective view showing the adjustable trip shaft 150, Figure 3 is a plan view of the main portion showing the arrangement of the adjustable trip shaft 150 and the trip adjustment bolt 120, Figure 4 is a part shown in FIG. Perspective view.

When the trip device 100 generates an abnormal current or an accident current such as an overcurrent, the bimetal 110 is bent in the direction of the adjustable trip shaft 150 and the trip adjustment bolt 120 is temporarily adjustable. ) By rotating, and the adjustable trip shaft 150 is configured to trip the switch unit to cut off the circuit by rotating the mechanism unit at the rear again. Reference numeral 130 is a nut for fixing the trip adjustment bolt 120 to the bimetal (110).

The trip device 100 is configured to adjust the trip time by moving the adjustable trip shaft 150 to adjust the interval with the bimetal 100 to adjust the trip time to have a demonstration operation characteristic.

That is, the adjustable trip shaft 150 has a contact surface 155 inclined at a portion corresponding to the contact portion 125 of the trip adjustment bolt 120. Accordingly, by operating an adjustment knob (not shown) connected to the support bar 151 side of the adjustable trip shaft 150, the contact portion 125 of the trip adjustment bolt 120 is moved by moving the adjustable adjustment shaft 150 left and right. ) And the interval (distance) between the inclined contact surface 155 of the adjustable trip shaft 150 is adjusted, thereby adjusting the trip time.

For example, the thermal rated current value may be arbitrarily adjusted to 0.8-0.9-1.0 through the inclined contact surface 155 of the adjustable trip shaft 150.

However, the trip device as described above is configured so that the contact surface 155 of the adjustable trip shaft 150 is inclined so that the trip time can be adjusted in a manner of adjusting the gap with the trip adjustment bolt 120, so that an accident occurs. When the bimetal 110 is bent and the trip adjustment bolt 120 pushes the adjustable trip shaft 150, the contact portion 125 of the trip adjustment bolt 120 is inclined contact surface of the adjustable trip shaft 150 ( A problem of sliding sideways along the 155 is generated, resulting in a large error range of the trip operation time.

In addition, the trip device as described above, since the gap jig is assembled along the inclined surface during the gap jig adjustment during the 200% thermal test, there is also a problem that the characteristic value is not constant.

The contents of the background art described above are technical information possessed by the inventor of the present application for the derivation of the present invention or acquired in the derivation process of the present invention, and are known technologies disclosed to the general public before the application of the present invention. You can't.

Republic of Korea Patent Publication No. 10-1198972

The present invention has been made to solve the above problems, by configuring the distance between the bimetal and the adjustable trip shaft using a step distance difference, it is possible to increase the thermal rated current value range more easily, and error An object of the present invention is to provide a thermally adjustable trip device for a circuit breaker that can minimize the range and improve the reliability of the circuit breaker.

In the thermally adjustable trip device of the circuit breaker according to the present invention for realizing the above object, the bimetal is deformed in a state spaced apart from the contact member and a contact member provided on one side of the bimetal And an adjustable trip shaft operated when the contact member is pushed, wherein the adjustable trip shaft includes a contact surface having a plurality of planes having different heights in the direction of the contact member at positions where the contact member is contacted and spaced apart from each other. Characterized in that configured to adjust the gap with the contact member.

Here, the contact surface of the adjustable trip shaft may be configured to have a continuous stepped structure.

The adjustable trip shaft may include a shaft main body disposed to the left and right, and the contact surface may be configured by combining a contact surface protruding from the shaft body toward the contact member and a contact surface of a groove structure recessed inwardly of the shaft body. have.

In addition, the adjustable trip shaft may be configured to be movable in the longitudinal direction for adjusting the distance to the contact member, the contact surface may be formed to gradually increase or decrease in the longitudinal direction of the adjustable trip shaft.

The contact member is preferably composed of a trip adjustment bolt which is assembled with a nut on the upper end of the bimetal projecting in the direction of the contact surface of the adjustable trip shaft.

On the other hand, according to another embodiment of the present invention, the contact surface of the adjustable trip shaft may have a configuration in which a plurality of planes of different heights are connected to the guide inclined surface.

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

In the thermal adjustable trip device of the circuit breaker according to the present invention, since the contact surface having a plurality of planes having different heights is formed on the adjustable trip shaft, the distance between the bimetal and the adjustable trip shaft can be set using a flat or stepped distance difference. Accordingly, the thermal rated current value range can be more easily set, and the error range according to the set value range can be minimized, thereby improving the reliability of the circuit breaker as a whole.

That is, in the present invention, when the rated current according to the load fluctuation is adjusted to an arbitrary value, the contact surface of the adjustable trip shaft is set using a plane distance difference or a step distance difference having different heights, so that the bolt is bent while the bimetal is bent in the event of an accident. When pushing the adjustable trip shaft, the adjustable trip shaft can be operated without slipping, thereby minimizing the error range of the trip operation.

In addition, the present invention can be designed so that the initial bolt position is only 0.63 times by increasing the amount of heat to prevent the jam caused by the distance difference when adjusting the range of thermal rated current value by using a planar distance difference or step distance difference of different heights. As a result, the thermal rated current range can be increased from 0.8-0.9-1.0 to 0.63-0.8-1.0.

In addition, since the gap jig can be assembled along the plane during the gap jig adjustment during the 200% thermal test, the present invention also has the effect of constantly setting the characteristic value for the trip operation.

1 is a cross-sectional view showing the internal structure of a conventional circuit breaker.
Figure 2 is a perspective view of the adjustable trip shaft of the conventional circuit breaker.
Figure 3 is a plan view of the main portion showing the arrangement of the adjustment trip shaft and trip adjustment bolt of the conventional circuit breaker.
4 is a perspective view of the portion shown in FIG. 3.
5 is a cross-sectional view showing the internal structure of a circuit breaker according to an embodiment of the present invention.
6 is a perspective view illustrating an adjustable trip shaft of a circuit breaker according to an exemplary embodiment of the present invention.
Figure 7 is a plan view of the main portion showing the arrangement of the adjustment trip shaft and the trip adjustment bolt of the circuit breaker according to an embodiment of the present invention.
8 is a perspective view of the portion shown in FIG. 7.
Figure 9 is a plan view of the main portion showing the arrangement of the adjustment trip shaft and the trip adjustment bolt of the circuit breaker according to another embodiment of the present invention.

With reference to the accompanying drawings will be described a preferred embodiment of the present invention.

5 is a cross-sectional view showing the internal structure of a circuit breaker according to an embodiment of the present invention.

Referring to FIG. 5, a circuit breaker according to an embodiment of the present invention includes a trip device 10, an opening and closing mechanism 20, a switch part (main circuit part 30) and an arc extinguishing part 40 of a case 5. It has a structure assembled inside.

The main components of the circuit breaker will be described below with reference to the main parts.

The trip device 10 is composed of a bimetal 50, a trip adjustment bolt 55, and a provisional trip shaft 60. The trip device 10 will be described in detail below with reference to FIGS. 6 to 8.

The opening and closing mechanism 20 has a function of mechanically turning on and off the converter, and a handle 21 capable of opening and closing a circuit by a pushing or pulling operation, and connected to the handle 21 to provide a handle 21. It consists of a lever 22 that provides a rotational support (not shown).

The switch unit 30 includes a fixed contactor 31 and a movable contactor 32 to which a power supply and a load are connected. The fixed contactor 31 is fixed to the case 5 and connected to an input side power supply. ) Is installed to be separated or contacted with the fixed contact 31 is connected to the load side power.

Here, the movable contact 32 is manually operated by the lever 22, or is operated by the opening and closing mechanism 20 triggered by the trip device 10.

The arc extinguishing unit 40 insulates the moving path between the fixed contactor 31 and the movable contactor 32 or separates it so as to divide and cool the arc generated when an accident current is generated and to discharge the arc pressure to the outside. It is composed.

 6 is a perspective view showing the adjustable trip shaft 60 of the trip device 10 according to an embodiment of the present invention, Figure 7 is a adjustable trip shaft of the trip device 10 according to an embodiment of the present invention 60 is a plan view of an essential part showing the arrangement of the trip adjustment bolt 55 and FIG. 8 is a perspective view of the portion shown in FIG.

6 to 8, when an abnormal current such as an overcurrent or an accident current occurs, the trip device 10 may be curved in the direction of the adjustable trip shaft 60 by the bimetal 50 connected to the circuit. The trip adjustment bolt 55 which is bent and the contact member pushes and rotates the adjustable trip shaft 60. At this time, the temporary adjustable trip shaft 60 rotates the mechanism part at the rear again, so that the switch part 30 and FIG. 5 are referred to. ) To trip the circuit.

The trip device 10 is configured to adjust the trip time by moving the provisional adjustment shaft 60 to adjust the interval with the bimetal 50 to have a demonstration operation characteristic.

When explaining the embodiment according to the present invention for this purpose is as follows.

The bimetal 50 is formed by attaching two kinds of thin metal plates having different coefficients of thermal expansion, and when heat is transferred from a heater (not shown) that generates heat when an abnormal overcurrent occurs, the adjustable trip shaft 60 side It is configured to bend in a direction.

The upper end 51 of the bimetal 50 is provided with a contact member in contact with the adjustable trip shaft 60. In this embodiment, the contact member exemplifies an embodiment consisting of a trip adjustment bolt 55 is assembled with a nut 58 to the upper end 51 of the bimetal 50 and arranged to protrude in the direction of the adjustable trip shaft 60. .

The trip adjustment bolt 55 has a contact portion 56 in contact with the adjustable trip shaft 60 at the end thereof. In this case, the contact portion 56 may be configured such that the end portion protrudes in a cone shape as illustrated in the figure.

The contact member is not limited to the trip adjustment bolt 55, and if the structure is capable of operating the adjustable trip shaft 60 according to the deformation of the bimetal 50, the contact member may be changed to various structures including a known contact member. can do.

The adjustable trip shaft 60 is configured to be operated when the bimetal 50 is deformed and the trip adjustment bolt 55 is pushed in a state spaced apart from the trip adjustment bolt 55 at a predetermined interval.

As shown in FIG. 6, the adjustable trip shaft 60 is formed of a shaft main body 61 arranged to be long to the left and a right, and a support bar protruding in a direction orthogonal to one side of the shaft main body 61. (67) is provided. An adjustment knob (not shown) is connected to the support bar 67 so that the temporary adjustment trip shaft 60 can be moved to the left and right, that is, the longitudinal direction X of the shaft main body 61 during the trip time adjustment. It is composed. Reference numeral 66 denotes a coupling shaft connected to the rear opening and closing mechanism side.

Since the configuration to move the provisional adjustment shaft 60 in the left and right directions (X direction) using an adjustment knob or the like for adjusting the distance from the trip adjustment bolt 55 is known in Korea Patent Publication No. 10-1198972, etc. , Drawings and detailed description thereof will be omitted.

The shaft body 61 of the adjustable trip shaft 60 has a plurality of planes having different heights in the trip adjustment bolt direction at positions where the trip adjustment bolt 55 is in contact with the trip adjustment bolt 55 so as to adjust the gap therebetween. The contact surface 65 which has is provided.

6 illustrates a configuration in which three pairs of contact surfaces 65 are provided. However, the configuration is not limited thereto, and the number of contact surfaces 65 may be variously modified and applied according to an implementation condition.

The contact surface 65 is preferably configured to have a continuous stepped structure that gradually increases or decreases in the longitudinal direction of the adjustable trip shaft 60 as illustrated in the figure.

At this time, referring to Figure 7, the contact surface 65, the contact surface (62, 63) protruding in the direction of the trip adjustment bolt 55 from the shaft body 61 and the inside of the shaft main body 61 The contact surface 64 of the groove structure can be combined.

Thus, according to the contact surface 65 which has the contact surface 62 and 63 of the protruding shape, and the recessed contact surface 64 of the groove structure, the shaft main body 61 is provided with a plurality of contact surfaces formed at different heights, and the shaft main body is provided. The height of the contact surface protruding from 61 can be minimized. As a result, since the thickness of the shaft main body 61 can be minimized as a whole, the usability of the internal circuit space of the circuit breaker can be greatly increased, and as a result, the circuit breaker can be more compactly constructed.

Through the configuration of the trip device 10 as described above, by operating the adjustment knob (not shown) configured on the support bar 151 side of the adjustable trip shaft 60 to adjust the adjustable trip shaft 60 to the left and right. When it is moved (X direction), the distance (distance) between the contact portion 56 of the trip adjustment bolt 55 and the stepped contact surface 65 of the adjustable trip shaft 60 is adjusted, and the trip time is adjusted through this distance adjustment. Can be adjusted.

That is, as illustrated in FIG. 7, when the adjustable trip shaft 60 is moved in the horizontal direction (X direction), the distance between the contact portion 56 of the trip adjustment bolt 55 and the contact surface 65 is A. FIG. The distance can be adjusted to any one of, B and C.

In addition, it is possible to easily increase the thermal rated current value range to 0.63-0.8-1.0 by using the distance difference between the stepped contact surfaces 65, which has conventionally set the thermal rated current value range to 0.8-0.9-1.0. .

Figure 9 is a plan view of the main portion showing the arrangement of the adjustment trip shaft and the trip adjustment bolt of the circuit breaker according to another embodiment of the present invention.

As shown in FIG. 9, in another embodiment of the present invention, contact surfaces 62, 63, and 64 of different heights adjacent to each other are connected to the inclined surface 71, respectively. That is, the contact surfaces 62 and 63 of the protruding shapes adjacent to each other are connected to the inclined surface 71, and the contact surfaces 64 of the groove structure adjacent to each other and the contact surfaces 63 of the protruding shape are inclined surfaces 72. To be connected.

According to the configuration in which the inclined surfaces 71 and 72 are connected between the contact surfaces 62, 63, and 64 having different heights, the trip time is adjusted while moving the adjustable trip shaft 60 in the left and right directions (X directions). At this time, it is possible to minimize the problem that the contact portion 56 of the trip adjustment bolt 55 is in contact with a contact surface of a different height than the contact surface set by being caught between neighboring contact surfaces 62, 63, 64. For example, although the contact portion 56 of the trip adjustment bolt 55 is set to contact the contact surface 64 of the groove structure, the adjustable trip shaft 60 is inadvertently moved to the contact surface 64 of the neighboring groove structure. And the inclined surface 72 between the contact surface 64 of the adjacent groove structure and the contact surface 63 of the protruding shape, even if the contact portion 56 of the trip adjustment bolt 55 is in contact with the contact surface 63 of the protruding shape. Since it is guided toward the contact surface 64 of the groove structure, the contact portion 56 of the trip adjustment bolt 55 can be guided to contact the contact surface 64 of the groove structure as set.

For reference, other components except for the inclined surfaces 71 and 72 in FIG. 9 may be configured in the same or similar to the exemplary embodiment of the present invention described above, and the same reference numerals will be described, and description thereof will be omitted.

As described above, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, which is merely exemplary, and various modifications and equivalents may be made by those skilled in the art to which the present invention pertains. Other embodiments are possible. Therefore, the technical protection scope of the present invention will be defined by the appended claims.

10: trip device 20: opening and closing mechanism
30: switch part 40: arc extinguishing part
50: bimetal 55: trip adjustment bolt
56 contact portion 60 adjustable trip shaft
61: shaft body 62, 63, 64, 65: contact surface
67: support bar 71, 72: inclined surface

Claims (5)

And a bimetal, a contact member provided on one side of the bimetal, and an adjustable trip shaft operated when the bimetal is deformed and the contact member is pushed while being spaced apart from the contact member at a predetermined interval.
The adjustable trip shaft has a contact surface having a plurality of planes different in height in the direction of the contact member at a position where the contact member is in contact with the contact member, and configured to adjust a distance from the contact member,
The adjustable trip shaft includes a shaft body disposed long left and right,
The contact surface is a contact surface protruding from the shaft body in the direction of the contact member and the contact surface of the groove structure that is dug inwardly of the shaft body is combined to form a stepped structure in the longitudinal direction of the shaft body,
The height of the protruding contact surface is constant for a predetermined length in the longitudinal direction of the shaft body in a stepped structure,
The height of the contact surface of the fine groove structure is a constant section in the longitudinal direction of the shaft body in the stepped structure,
The height of the protruding contact surface and the height of the contact surface of the fine groove structure are differently provided in the longitudinal direction of the shaft body, thereby increasing space utilization and minimizing an error range of the adjustable trip shaft. Adjustable trip device. The method according to claim 1,
The thermally adjustable trip device of the circuit breaker, characterized in that the contact surface of the adjustable trip shaft has a continuous stepped structure. delete The method according to claim 1 or 2,
The adjustable trip shaft is configured to be movable in the longitudinal direction for adjusting the distance with the contact member,
The thermally adjustable trip device of the circuit breaker, characterized in that the contact surface is formed to gradually increase or decrease in the longitudinal direction of the adjustable trip shaft. The method according to claim 1 or 2,
The contact surface of the adjustable trip shaft is a thermal adjustable trip device of the circuit breaker, characterized in that a plurality of planes of different heights are connected to each other by the guide inclined surface.
KR1020150045646A 2015-03-31 2015-03-31 Trip device of molded case circuit breaker KR102018874B1 (en)

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KR102018874B1 true KR102018874B1 (en) 2019-09-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240001886A (en) 2022-06-28 2024-01-04 에이치디현대일렉트릭 주식회사 Apparatus for strain measurement of bimetal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101489603B1 (en) * 2013-11-22 2015-02-06 현대중공업 주식회사 Trip device of molded-case circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200190797Y1 (en) * 1997-11-11 2000-08-01 이종수 Trip device of a circuit breaker
KR101198972B1 (en) * 2008-10-14 2012-11-07 현대중공업 주식회사 Thermal Adjustable Trip Device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101489603B1 (en) * 2013-11-22 2015-02-06 현대중공업 주식회사 Trip device of molded-case circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240001886A (en) 2022-06-28 2024-01-04 에이치디현대일렉트릭 주식회사 Apparatus for strain measurement of bimetal

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