KR102053166B1 - Molded case circuit breaker - Google Patents

Molded case circuit breaker Download PDF

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Publication number
KR102053166B1
KR102053166B1 KR1020150045631A KR20150045631A KR102053166B1 KR 102053166 B1 KR102053166 B1 KR 102053166B1 KR 1020150045631 A KR1020150045631 A KR 1020150045631A KR 20150045631 A KR20150045631 A KR 20150045631A KR 102053166 B1 KR102053166 B1 KR 102053166B1
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KR
South Korea
Prior art keywords
core
movable core
shaft member
sides
bearing groove
Prior art date
Application number
KR1020150045631A
Other languages
Korean (ko)
Other versions
KR20160117047A (en
Inventor
강성우
Original Assignee
현대일렉트릭앤에너지시스템(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 현대일렉트릭앤에너지시스템(주) filed Critical 현대일렉트릭앤에너지시스템(주)
Priority to KR1020150045631A priority Critical patent/KR102053166B1/en
Publication of KR20160117047A publication Critical patent/KR20160117047A/en
Application granted granted Critical
Publication of KR102053166B1 publication Critical patent/KR102053166B1/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
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/66—Power reset mechanisms
    • H01H71/68—Power reset mechanisms actuated by electromagnet
    • 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
    • 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
    • H01H71/66—Power reset mechanisms
    • H01H2071/665—Power reset mechanisms the reset mechanism operating directly on the normal manual operator, e.g. electromagnet pushes manual release lever back into "ON" position

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Abstract

In the present invention, a pair of support members (side panels) constituting the core holder is provided with bearing grooves, and shaft members are respectively provided on the bearing grooves of the support member on both sides of the movable core, and the lower end of the movable core is provided. The jaw portion for preventing the detachment of the shaft member through the inlet of the bearing groove by the engaging action with the lower end of any one of the supporting member is provided, the circuit breaker for wiring.

Description

Circuit Breakers {MOLDED CASE CIRCUIT BREAKER}

The present invention relates to a molded case circuit breaker (MCCB) for protecting a circuit or a load by blocking a circuit when a fault current occurs.

In general, a circuit breaker includes a main circuit unit having a fixed contactor and a movable contactor, an opening / closing mechanism for opening and closing the main circuit unit, and a tripping circuit for blocking the main circuit unit by operating the opening / closing mechanism in a trip position when a fault current flows in the main circuit unit. And a trip mechanism. The movable contactor is contacted or separated (released) from the fixed contactor by the opening and closing mechanism. Therefore, when the opening and closing mechanism is operated to the trip position by the trip mechanism, the movable contact is separated from the fixed contact, and accordingly the main circuit unit is cut off.

The circuit breaker configured as described above is disclosed in Korean Patent Publication No. 10-1276370 (June 18, 2013).

1 is a cross-sectional view showing a tripping mechanism of a circuit breaker according to the prior art, and FIG. 2 is a cross-sectional view taken along the line A-A of FIG. The trip mechanism will be described in detail with reference to FIGS. 1 and 2.

The trip mechanism 1 is electrically connected to the main circuit unit, and is fixed to the fixed core 2 for generating electromagnetic force when a fault current is generated, and rotated by an electromagnetic suction force according to the occurrence of fault current. And a movable core assembly having a movable core 3 (also called an armature) for operation. The fixed core 2 is made of a magnetic body. The movable core 3 is composed of a rotating member 4 disposed to face the fixed core 2 and an operating member 5 extending upward from the rotating member 4 to manipulate the trip position operation of the opening and closing mechanism. .

The movable core assembly includes a core holder having side panels 6 disposed on the left and right sides of the movable core 3, and the rotating member 4 is coupled to the left and right side panels 6 so as to be rotatable on both sides. do. The upper side of the rotating member 4 is provided with a pinhole 7 penetrating from side to side, the side panel 6 is provided with a pinhole 8 corresponding to the pinhole 7 of the rotating member 4, When the fault current is generated by inserting the hinge pins 9 into the pinholes 7 and 8, the rotating member 4 is rotated about the hinge pins 9 by the electromagnetic attraction force, and the operation member 5 is rotated. It rotates in the same direction as the member 4 to operate the opening and closing mechanism in the trip position.

However, the wiring breaker including the trip mechanism 1 configured as described above, the assembly tolerance between the pinhole 7 and the hinge pin 9 of the rotating member 4 for smooth rotational movement of the movable core 3 and Since the assembly tolerances between the pinhole 8 and the hinge pin 9 of the side panel 6 must be considered together, the clearance between the pinholes 7 and 8 and the hinge pin 9 on both sides of the assembled panel must be increased. Accordingly, there is a problem in that the gap between the fixed core 2 and the movable core 3 facing each other is not maintained accurately at the set interval, and a defect is caused in the operation for operating the opening / closing mechanism to the trip position while moving away from the set interval.

In addition, in order to assemble the movable core 3 and the core holder, the pinhole 7 of the rotating member 4 and the pinhole 8 of the side panel 6 coincide with each other, and then the pinholes 7 and 8 matched with each other. After inserting the hinge pin 9, since the process of having to fix the position of the inserted hinge pin (9) has to go through, there is a problem that the maintenance and repair is inconvenient because the assembly is difficult.

Embodiments of the present invention have an object to provide a circuit breaker that is more advantageous in terms of improved operation reliability and assembly of the trip mechanism.

The problem to be solved is not limited thereto, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, a stationary core is electrically connected to a main circuit unit and generates an electromagnetic force when a fault current such as an overcurrent or a short circuit current flows in the main circuit unit. )Wow; It is disposed to face the fixed core, both sides are rotatably supported by a core holder (rotated), and includes a movable core that is rotated by electromagnetic attraction force to operate the switching mechanism to the trip position The core holder for supporting the movable core includes a pair of support members (side panels) disposed at both sides of the movable core and provided with bearing grooves at the top, respectively, and at both sides of the movable core with the bearing grooves. Each of the shaft members to be seated is provided, the movable core may be provided with a circuit breaker, the rotation around the shaft member.

A lower end of the movable core may be provided with a jaw to prevent the positional deviation of the shaft member through the inlet of the bearing groove by engaging with the lower end of at least one of the pair of support members.

At least one of the pair of supporting members has a bending portion bent from the lower side to the lower side of the movable core so as to be positioned below the movable core, and the jaw portion is disposed below the bending portion to engage with the bending portion. The positional deviation of the shaft member can be prevented by.

The jaw portion is preferably provided on both sides of the lower side of the movable core so as to engage with the lower ends of the pair of support members, respectively.

According to an embodiment of the present invention, the fixed core is electrically connected to the main circuit unit and generates an electromagnetic force when a fault current flows through the main circuit unit; It is disposed to face the fixed core, both sides are rotatably supported by a core holder, and includes a movable core rotated by electromagnetic attraction force to operate the opening and closing mechanism in the trip position, the core holder is on both sides of the movable core And a pair of support members each disposed and provided with a bearing groove at an upper end thereof, wherein the movable core is provided with shaft members seated at the bearing grooves on both sides thereof, and is rotated about the shaft member, and is prevented by the separation preventing means. A circuit breaker can be provided which prevents the positional deviation of the shaft member through the inlet of the bearing groove.

Means for solving the problems will become more specific and clear through the embodiments, drawings, and the like described below. In addition, in the following, various solutions other than the above-mentioned solutions may be further presented.

According to the embodiment of the present invention, the movable core is rotatably assembled to the core holder when the shaft member of the movable core is inserted into the bearing grooves provided on both support members (side panels) constituting the core holder. The skilled person also has the advantage of simple and quick assembly and disassembly of the movable core and core holder.

In addition, in order to accurately rotate the movable core, only the assembly tolerance between the bearing groove and the shaft member needs to be taken into consideration, so that the gap between the fixed core and the movable core can be minimized due to the tolerances, which can minimize the occurrence of the problem of deviation from the set interval. There is this.

In addition, according to the jaw portion (release prevention means) for preventing the displacement of the shaft member through the inlet of the bearing groove by the engaging action of the lower end of the support member on the lower side of the movable core, the movable core is unintentionally separated from the core holder. There is an advantage that can prevent the phenomenon. For example, it is possible to prevent the movable core from being separated from the core holder when the circuit breaker is installed upside down on the ceiling or when an external force such as an impact is applied to the circuit breaker.

1 is a cross-sectional view showing a tripping mechanism of a circuit breaker according to the prior art.
FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1.
3 is a perspective view illustrating a part of a circuit breaker according to an exemplary embodiment of the present invention.
4 is a perspective view illustrating a part of the trip mechanism shown in FIG. 3.
5 is a perspective view illustrating a portion B of FIG. 4.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. For reference, in the drawings referred to describe the embodiments of the present invention, the size of the component, the thickness of the line, etc. may be somewhat exaggerated for convenience of understanding. In addition, the terms used to describe the embodiments of the present invention are mainly defined in consideration of functions in the present invention, and may vary according to intentions, customs, and the like of users and operators. Therefore, the terms should be interpreted based on the contents throughout the present specification.

A circuit breaker according to an embodiment of the present invention is shown in FIGS. 3 to 5.

As shown in FIG. 3, a circuit breaker according to an exemplary embodiment of the present invention includes a circuit breaker case 10, a main circuit unit (not shown), an opening and closing mechanism 20, and a tripping mechanism 100. Then, the main circuit unit, the opening and closing mechanism 20 and the trip mechanism 100 are mounted on the circuit breaker case 10.

The main circuit unit includes a stationary contactor and a movable contactor disposed to face the stationary contactor. The main circuit unit has a configuration in which the movable contactor is in contact with or separated from the fixed contactor according to the rotational direction.

The opening and closing mechanism 20 rotates the movable contactor to open or close the main circuit unit. When the opening and closing mechanism 20 is operated in the trip position, the movable contactor is disconnected (released) from the fixed contactor, whereby the main circuit unit is cut off (circuit open).

The trip mechanism 100 is configured to operate the switch mechanism 20 to a trip position when a fault current such as an overcurrent or a short circuit current flows through the main circuit unit.

The trip mechanism 100 will be described with reference to FIGS. 4 and 5. The trip mechanism 100 includes a fixed core 110, a movable core 120, a core holder 130, and a trip shaft 140.

The fixed core 110 is electrically connected to the main circuit unit, and is composed of a magnet (magnetic material) to generate an electromagnetic force when a fault current is generated in the main circuit unit.

The movable core 120 is disposed to face the fixed core 110 in front of the fixed core 110, is rotatably supported in the front-rear direction by the core holder 130, and is rotated by electromagnetic attraction force. For reference, the movable core 120 is also called an armature.

The trip shaft 140 is disposed in the left and right direction between the opening and closing mechanism 20 and the movable core 120. The trip shaft 140 is rotated by the rotation operation force from the movable core 120 to operate the opening and closing mechanism 20 to the trip position.

The fixed core 110, the movable core 120, and the core holder 130 may be provided in plural sets and spaced apart from each other in the left and right directions.

In the trip mechanism 100, when a fault current flows through the main circuit unit and an electromagnetic force is generated in the fixed core 110, the movable core 120 is rotated by an electromagnetic suction force and attracted to the fixed core 110, and the trip shaft 140 is rotated by the rotatable movable core 120 to operate the opening and closing mechanism 20 to block the main circuit unit.

The core holders 130 are disposed on both sides of the movable core 120 so as to face each other, and both sides of the core holder 130 are connected to the pair of side panels 130B and the pair of side panels 130B, respectively, to form a core receiving region therebetween. It consists of a connection panel 130A. The connection panel 130A is arranged to block the rear of the core receiving area.

The fixed core 110 is preferably mounted on the connection panel 130A to be located in the core receiving area.

The movable core 120 protrudes upward from the rotary block 120-1 and the rotary block 120-1 disposed to face the fixed core 110 in the core receiving area and is located outside the core receiving area. It consists of the member 120-2.

The rotating block 120-1 includes a pair of side members 120B facing each of the side panels 130B and a connecting member 120A connected to both sides of the pair of side members 120B, respectively. . The operation member 120-2 may be connected to an upper end of any one of the pair of side members 120B. The connecting member 120A is arranged to block the front of the core receiving area. The side member 120B and the connection member 120A are preferably formed to have a plate-like structure.

The side panels 130B respectively support both sides of the rotation block 120-1 so that the rotation block 120-1 can rotate. To this end, a bearing groove 132 having a concave recessed shape is provided at an upper end of each side panel 130B, and a shaft member 122 seated in the bearing groove 132 is provided at an upper portion of each side member 120B. To be prepared.

According to the shaft member 122 and the bearing groove 132, the movable core 120 is inserted into the bearing member 132 in both bearing grooves 132 and seated in the core holder 130 in the front and rear directions. It is assembled rotatably. At this time, the shaft member 122 is maintained in the bearing groove 132 by the weight of the movable core 120 is maintained.

When the electromagnetic attraction force acts upon the occurrence of the fault current, the rotary block 120-1 is rotated about the shaft member 122 so that the lower end side is attracted to the fixed core 110. At this time, the operation member 120-2 is also rotated to rotate the trip shaft 140.

The movable core 120 is fixed in position by release preventing means (see reference numerals 124 and 134) which prevents the positional deviation of the shaft member 122 through the inlet (open top) of the bearing groove 132.

The separation preventing means (refer to reference numerals 124 and 134) is a bending portion 134 and each bending bent about 90 degrees from the lower end of each side panel 130B toward the core receiving region so as to be located below each side member 120B. It is composed of a jaw portion 124 provided on the lower side of each side member 120B to be positioned below the portion 134 to prevent the positional deviation of the shaft member 122 by the engaging action with the bending portion 134. Of course, the jaw portion 124 and the bending portion 134 paired with each other to be engaged are provided to have a structure that does not interfere with the rotational movement of the movable core 120.

The jaw portion 124 preferably extends downward from the lower end of the side member 120B so as to be positioned behind the bending portion 134 and then bent about 90 degrees forward. If the jaw portion 124 is formed in this way, the movable core 120 which is rotated by the electromagnetic attraction force and then returned to the original position may be excessively rotated to prevent the jaw portion 124 from being displaced from the home position. That is, the vertical portion of the vertical portion disposed in the vertical direction of the jaw portion 124 and the horizontal portion disposed in the front-back direction is caught by the bending portion 134, so that the rotation of the movable core 120 returned to the original position is limited.

The present invention has been described above, but the present invention is not limited to the disclosed embodiments and the accompanying drawings, and may be variously modified by those skilled in the art without departing from the technical spirit of the present invention. In addition, the technical idea described in the embodiments of the present invention may be implemented independently, or two or more may be implemented in combination with each other.

100: trip mechanism
110: fixed core
120: movable core (amateur)
122: shaft member
124: jaw
130: core holder
132: bearing groove
134: bending part
140: trip shaft

Claims (4)

A fixed core electrically connected to the main circuit unit and generating an electromagnetic force when a fault current flows through the main circuit unit;
It is disposed to face the fixed core, both sides are rotatably supported by a core holder, and includes a movable core that is rotated by electromagnetic attraction force to operate the opening and closing mechanism in the trip position,
The core holder is disposed on both sides of the movable core and is provided with a bearing groove at the upper end, respectively, the lower end includes a pair of support members including a bending portion bent toward the movable core receiving area,
The movable core is provided with shaft members which are respectively seated in the bearing grooves on both sides thereof, are rotated around the shaft member, and the bearing grooves are engaged with at least one bending part of the pair of supporting members at a lower side thereof. The jaw portion is provided to prevent the positional deviation of the shaft member through the inlet of,
The bearing groove and the shaft member, the circuit breaker is provided to be completed so that the movable core is rotatable in the front and rear direction when the shaft member is seated in the bearing groove. The method according to claim 1,
The jaw portion is provided on both sides of the lower side of the movable core, respectively engaging with the bending portion of the pair of support members,
Circuit breakers. The method according to claim 1 or 2,
At least one of the pair of support members has the bending portion bent from the lower side to the lower side of the movable core to be located below the movable core,
The jaw portion is disposed on the lower side of the bending portion to prevent the positional deviation of the shaft member by the locking action with the bending portion,
Circuit breakers. A fixed core electrically connected to the main circuit unit and generating an electromagnetic force when a fault current flows through the main circuit unit;
It is disposed to face the fixed core, both sides are rotatably supported by a core holder, and includes a movable core that is rotated by electromagnetic attraction force to operate the opening and closing mechanism in the trip position,
The core holder is disposed on both sides of the movable core and includes a pair of support members each provided with a bearing groove at the top,
The movable core is provided with shaft members which are respectively seated in the bearing grooves on both sides thereof, are rotated about the shaft member, and the separation of the shaft members through the inlet of the bearing grooves is prevented by the separation preventing means.
The bearing groove and the shaft member, the circuit breaker is provided to be completed so that the movable core is rotatable in the front and rear direction when the shaft member is seated in the bearing groove.
KR1020150045631A 2015-03-31 2015-03-31 Molded case circuit breaker KR102053166B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150045631A KR102053166B1 (en) 2015-03-31 2015-03-31 Molded case circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150045631A KR102053166B1 (en) 2015-03-31 2015-03-31 Molded case circuit breaker

Publications (2)

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KR20160117047A KR20160117047A (en) 2016-10-10
KR102053166B1 true KR102053166B1 (en) 2019-12-06

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102358819B1 (en) * 2021-06-30 2022-02-08 상도일렉트릭 주식회사 Circuit breaker equipped with instantaneous earth leakage double trip device and instantaneous earth leakage double trip device insulated from the circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200477250Y1 (en) * 2011-12-30 2015-05-22 엘에스산전 주식회사 Instant trip mechanism for molded case circuit breaker

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