KR20170009349A - Relay of electronic vehicle for improved arc extinguish - Google Patents

Abstract

The present invention relates to a relay capable of quickly breaking a current, comprising: a fixed contact; A movable contact which is brought into contact with and separated from the fixed contact; A shaft connected to the movable contact to move the movable contact; A housing for accommodating the stationary contact and the movable contact; An actuator for driving the shaft; And an arc stretching member detachably attached to the housing to elongate an arc generated between the stationary contact and the movable contact.

Description

[0001] RELAY OF ELECTRONIC VEHICLE FOR IMPROVED ARC EXTINGUISH [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a relay for an electric vehicle, and more particularly, to a relay that improves current interruption performance by extending an arc generated when a stationary contact and a movable contact are separated,

Generally, an electric vehicle uses a motor using a battery as a power source, and a hybrid electric vehicle uses a motor using an engine of an internal combustion engine and a battery as a power source. In a hybrid vehicle or an electric vehicle, a plurality of batteries are connected in series or series and a parallel combination structure according to a required capacity, and the vehicle is driven by supplying power to the motor by mounting the battery in a form of a battery set .

In such an electric vehicle, a circuit opening / closing device for supplying and disconnecting the electric power stored in the battery to the motor as needed is required. A direct current relay is mainly used as the circuit opening / closing device. The relay is a type of an electric circuit switching device that transmits mechanical signals and current signals using the electromagnet principle. These relays are disposed inside the battery system to switch the battery to supply or cut off the motors and various parts of the electric vehicle.

But. When the relay is used as a circuit opening / closing device, the following problems arise. Generally, a relay includes a fixed contact and a movable contact, and the movable contact is driven by an electrical signal to contact or separate from the fixed contact, thereby supplying or blocking electric power.

High voltage is applied to these relays. When separating the fixed contact and the movable contact to cut off the power, arc and heat are generated near the contact point by the high voltage. However, since the arc itself is a current flow and the stationary contact and the movable contact are connected by the arc, the current is not blocked by the arc even if the stationary contact and the movable contact are separated from each other.

As a result, current interruption can not be performed quickly, and precise control of the relay can not be performed. Also, wear of the contacts is cumulative due to repetitive contact or disconnection of the contacts, shortening the service life of the relay.

An object of the present invention is to provide a relay capable of quickly blocking an electric current by providing an arc elongating member for extending an arc.

Another object of the present invention is to provide a relay capable of detachably attaching an arc elongating member to a housing.

In order to achieve the above object, a relay according to the present invention includes: a stationary contact; A movable contact which is brought into contact with and separated from the fixed contact; A shaft connected to the movable contact to move the movable contact; A housing for accommodating the stationary contact and the movable contact; An actuator for driving the shaft; And an arc stretching member detachably attached to the housing to elongate an arc generated between the stationary contact and the movable contact.

The actuator includes an exciting coil for generating an electromagnetic force; A stator and a movable element vertically disposed in the exciting coil; And a return spring disposed between the stator and the mover for returning the mover to the home position, wherein the housing is made of ceramic.

Wherein the arc elongating member comprises: a body disposed within the housing; An arc inducing part formed on a first surface of the main body and flowing an arc; And a first engaging portion formed on a second surface of the main body and coupled with the housing, wherein the arc guiding portion is formed of at least one metal protrusion of a circular or polygonal shape.

In addition, the arc elongating member may be an arc guiding part detachably attached to the inside of the housing made of metal or an arc guiding part detachably attached to the outside of the housing.

In the present invention, an arc elongating member is provided in a relay to extend an arc length by inducing an arc generated at a stationary contact and a movable contact, and an arc can be quickly removed according to elongation of an arc, . ≪ / RTI > As a result, it is possible to quickly supply and cut off the current applied to the motor or the parts of the electric vehicle, thereby enabling accurate control of the motor and the parts.

Further, in the present invention, since the arc elongating member is detachably assembled inside or outside the housing of the relay, it is possible to form it separately from the housing of the relay. As a result, the manufacturing process of the arc elongated member of simplified shape can be simplified and the manufacturing cost can be reduced.

1 is a block diagram conceptually showing a schematic structure of an electric vehicle according to the present invention;
2 is a perspective view of a relay according to a first embodiment of the present invention;
3 is a sectional view taken along the line AA in Fig.
4 is a perspective view showing a structure of an arc stretching member according to the present invention.
5 shows the arc elongation in a relief according to the invention;
6A and 6B are views showing another structure of a relay according to the first embodiment of the present invention.
7 is a cross-sectional view showing a structure of a relay according to a second embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing an internal structure of an electric vehicle according to the present invention.

As shown in FIG. 1, the electric vehicle according to the present invention includes a battery unit 101 for storing electric energy of a high voltage, and an electric motor 101 connected to the battery unit 101, And a relay 103 connected to the battery unit 101 via the relay 103. The current supplied from the battery unit 101 is supplied to the relay unit 103, A converter 105 for controlling the electric charging of the battery unit 101 to determine the remaining capacity of the battery unit 101 and the necessity of charging the battery unit 101 and supplying the current stored in the battery unit 101 to the motor A battery control unit 190 for controlling the operation of the converter 105 and a start unit 106 for applying a start signal to the vehicle control unit 104, ).

The battery unit 101 includes a plurality of battery cells storing high-voltage electric energy, and is charged with power supplied from a charging station, a vehicle charging facility, or a home. The battery unit 101 supplies the energy required for driving the electric vehicle or the energy required to operate the components such as an electric power steering, a water pump, an air conditioner, a turn signal lamp, a tail lamp, a head lamp, a brush and the like.

The relay 103 operates in accordance with a control signal applied from the vehicle control unit 104 to supply the current charged in the battery unit 101 to the converter 105. That is, the relay 103 operates according to a control command of the vehicle control unit 104 at the start of the vehicle to supply current to the converter 105, converts the current supplied from the converter 105, Apply current to motor and each part.

The battery management unit 108 charges the battery cells of the battery unit 101 and keeps the voltage difference between the battery cells in the battery unit 101 constant during operation of the electric vehicle so that the battery unit 101 is overcharged or overdischarged The life of the battery unit 101 can be extended. In addition, the battery management unit 108 allows the vehicle to run for a long time through the management of the current use, measures the remaining amount and voltage of the battery unit 101, and outputs the measured remaining amount and voltage to the vehicle control unit 104. Although not shown in the figure, the battery management unit 108 may include a protection circuit for current supplied to the battery unit 101. [

The vehicle control unit 104 transmits a relay driving signal for driving the relay 103 to the relay 103. As the relay 103 is driven, the battery unit 101 is electrically connected to the converter 105, (101) is supplied to the converter (105).

The relay 103 is controlled so that high-voltage operation power is not suddenly supplied when the vehicle starts, so that the power can be stably supplied to the vehicle. The vehicle control unit 104 also controls the converter 105 by controlling the on / off state of the relay 103 and transmitting and receiving the control signal with the converter 105.

Although not shown in the drawings, the starting portion 106 may be configured to turn on / off the connection between the key box of the vehicle and the vehicle accessory, the connection between the battery and the electric wire of the vehicle, And a start switch driving unit for driving the start switching unit and the start switching unit. At this time, the starting unit 106 may include not only the starting of the vehicle starting with the automobile key but also the starting portion of the start button.

When the vehicle is started by the starting unit 106, a signal is applied from the starting unit 106 to the vehicle control unit 104, and the vehicle control unit 104 executes overall control related to the vehicle operation. At this time, the vehicle control unit 104 controls the battery unit 101 through the battery management unit 108.

The converter 105 transmits a relay driving command signal requesting the vehicle control unit 104 to drive the relay 103 and the vehicle control unit 104 drives the relay 103 upon receiving the signal. The converter 105 performs PMW switching according to a control signal applied from the vehicle control unit 104 to convert the voltage of the battery unit 101 of several hundred volts to a voltage of approximately 12 V and supplies the voltage to the motor and various components.

2 and 3 are views showing a structure of a relay of an electric vehicle according to a first embodiment of the present invention, wherein Fig. 2 is a perspective view and Fig. 3 is a sectional view taken along the line A-A.

As shown in FIG. 2, the relay 103 according to the present invention includes a housing 132 and a case 130 under the housing 132.

A fixed contact 134, a movable contact 136, a shaft 138, and a contact spring 148 are provided in the housing 132. At this time, the housing 132 extends to the case 130 disposed at the lower part and contacts the upper surface of the case 130, and contacts the fixed contact 134, the movable contact 136, the shaft 138 and the contact spring 148, Lt; / RTI > The housing 132 is preferably made of a material such as ceramic that has heat resistance and wear resistance and is easy to mold. The fixed contact 134 and the movable contact 136 may be made of a highly conductive metal such as copper.

A screw hole 134a is formed in the fixed contact 134 so that a cable or a bus bar 150 for transmitting current to the load side is fastened to the fixed contact 134 by a screw 152.

The fixed contact 134 is disposed on the upper portion of the housing 132 and is connected to the motor and various parts of the electric vehicle. The movable contact 136 moves in the vertical direction and contacts or separates from the fixed contact 134, Or to supply or block the load. On the other hand, the contact pressure spring 148 maintains the contact state with a pressure equal to or higher than a certain level when the movable contact 136 contacts the fixed contact 134 due to elasticity.

In the case 130, an electric actuator is disposed. The electric actuator includes an exciting coil 142, a stator 143, a mover 146, a return spring 144, and a shaft 138 passing through the case 130 along the axial direction from the top.

The exciting coil 142 is formed in a cylindrical shape to form an empty space therein and generates electromagnetic force by an electrical signal to generate a driving force between the stator 143 and the moving element 146. The stator 143 is connected to the exciting coil (142). The mover 146 is disposed in a cylindrical shape below the stator 143 of the vacant space inside the exciting coil 142.

The mover 146 is also referred to as an armature. The mover 146 is cylindrical and has a through-hole formed along the central axis thereof, so that the other end of the shaft 138 is fixedly inserted. The mover 146 is moved upward by the electric power generated by the exciting coil 142 and the upward motion of the mover 146 is transmitted to the movable contact 136 through the shaft 138, The contact 136 is moved up and down.

The return spring 144 is positioned between the stator 143 and the mover 146 to return the mover 146 to the original position by elasticity when the mover 146 is driven in the vertical direction.

The shaft 138 is axially passed through the center of the stator 143, the return spring 144 and the mover 146 to be engaged with the contact spring 148 and the movable contact 136. Accordingly, as the mover 145 moves by the electromagnetic force, the shaft 138 moves upward, and the movable contact 136 moves upward by the movement of the shaft 138 to move the fixed contact 134 .

An arc elongating member 160 is disposed in the housing 132 to remove an arc generated when the movable contact 136 and the stationary contact 134 come into contact with each other. When the movable contact 136 and the fixed contact 134 in the housing 132 are separated from each other to cut off the current supply to the motor or the load, an arc and a magnetic field are generated near the contacts of the movable contact 136 and the fixed contact 134. [ Heat is generated. Since the arc is a current flow, when the movable contact 136 and the fixed contact 134 are separated from each other, a current flows through the arc and the interruption of the current is delayed. As a result, since the current is not quickly blocked, the driving of the motor and various components can not be precisely controlled. Therefore, in order to quickly shut off the current to control the motor and the component, the arc generated between the movable contact 136 and the fixed contact 134 must be extinguished.

In the present invention, an arc elongating member 160 is provided to extinguish an arc generated in the movable contact 136 and the stationary contact 134. That is, the arc elongating member 160 exerts an arc by extending an arc. The elongation of the arc means extending the length of the arc, and since the arc is a discharge in space, when the length becomes longer, the thickness of the arc becomes relatively thin and eventually breaks. , The flow of current through the arc is blocked.

3, the arc elongating member 160 includes a main body 160a and a fixed contact 134 formed on the upper surface of the main body 160a and including a movable contact 136 and a fixed contact 134 inside the housing 132, An arc inducing part 160b protruding toward the contact area of the main body 160a to induce an arc and a first engaging part 160c formed on the lower surface of the main body 160a.

The arc inducing portion 160b is made of metal and an arc generated between the movable contact 136 and the stationary contact 134 is guided to the arc inducing portion 160b and the main body 160a can be formed of various materials have. For example, the main body 160a may be formed of the same material as the arc guide portion 160b, that is, a metal, and may be integrally formed with the arc guide portion 160b. The main body 160a may be made of the same material as the housing 132, (Not shown). The main body 160a may be formed of any material as long as it has heat resistance and wear resistance.

The first engaging portion 160c has a convex shape protruding from the rear surface of the main body 160a. In addition, a second engaging portion 132a is formed on the housing 132 to which the arc stretching member 160 is attached. The second engaging portion 132a is formed in a concave shape so that the first engaging portion 160c of the arc elongating member 160 is inserted into the second engaging portion 132a of the housing 132, An arc stretching member 160 is attached to the inner wall of the housing 132. [ At this time, the first coupling portion 160c is formed of a material having elasticity such as resin and is detachably coupled to the second coupling portion 132a.

The first engaging portion 160c is formed in a concave shape and the second engaging portion 132a is formed in a convex shape so that the first engaging portion 160c is inserted into the second engaging portion 132, The stretching member 160 may be coupled to the inner wall of the housing 132. [

4 is a perspective view showing the structure of the arc elongating member 160. As shown in FIG. As shown in FIG. 4, the main body 160a of the arc elongating member 160 is formed in a plate shape having a predetermined height h. In the drawing, four such plate-like shapes are provided in a rectangular shape and attached inside four side walls of the housing 132, but the arc-stretching member 160 may be composed of three plates or two plates parallel to each other. Since the arc elongating member 160 is for guiding an arc generated between the movable contact 136 and the stationary contact 134, if the arc can be easily guided, its shape and position can be any shape and position Do.

The arc guide portion 160b is formed along the longitudinal direction of the main body 160a on the inner surface of the main body 160a. Although the arc derivative 160b is formed as a rectangular protrusion, any shape can be used as long as it can easily induce an arc generated between the movable contact 136 and the fixed contact 134. [ Further, although a certain number of protruding arcuate guiding portions 160b are formed in the drawing, the arc guiding portion 160b of the present invention need not be limited to a specific number.

The first engaging portion 160c is formed on the outer surface of the main body 160a along the longitudinal direction of the main body 160a. Although not shown in the drawing, a concave second engaging portion 132a having the same length as the first engaging portion 160c is formed on the inner wall of the housing 132 corresponding to the first engaging portion 160c The first engaging portion 160c is inserted into the second engaging portion 132a and the arc stretching member 160 is attached to the inner wall of the housing 132. [

As described above, in the present invention, the arc fastening member 160 is detachably attached to the inner wall of the housing 132 by engaging the first engaging portion 160c and the second engaging portion 132a. Although the first coupling portion 160c and the second coupling portion 132a are described as having a specific structure in the drawings and the above description, the first coupling portion 160c and the second coupling portion 132a of the present invention are not limited to the specific Structure need not be formed. In the present invention, since the arc stretching member 160 is detachably attached to the inner wall of the housing 132, the first and second engaging portions 160c and 132a may be formed in any structure There will be.

As described above, in the present invention, the arc stretching member 160 is detachably attached to the inner wall of the housing 132, so that the current supplied from the battery to the motor and the parts can be quickly cut off.

That is, in the present invention, since the arc elongating member 160 having the arc guide portion 160b of metal is installed on the inner wall of the housing 132, an arc generated between the movable contact 136 and the stationary contact 134 The arc is guided to the arc inducing part 160b, and the length of the arc is increased by induction of the arc.

5 is a view showing that the length of the arc A is elongated by the arc elongating member 160. Fig. The arc A generated between the movable contact 136 and the fixed contact 134 does not exist only between the movable contact 136 and the stationary contact 134, And is guided to the arc elongating member 160 side by the spring 160b to be elongated. The arc A between the movable contact 136 and the fixed contact 134 is reduced as the arc A is elongated and the length thereof becomes longer and the movable contact 136 is fixed to the movable contact 136 as the arc A is further elongated. The arc A is extinguished between the contact points 134 and the contact between the movable contact 136 and the fixed contact 134 is interrupted to interrupt the supply of current to the motor and the parts to stop the driving of the motor and the parts.

As described above, in the present invention, arc (A) generated between the movable contact 136 and the stationary contact 134 is extended by the arc elongating member 160 to move the movable contact 136 and the stationary contact 134, The electric current between the movable contact 136 and the fixed contact 134 is quickly blocked by the arc when the motor /

 Since the arc elongating member 160 elongates the arc A between the movable contact 136 and the stationary contact 134 as described above, the arc elongating member 160 moves the movable contact 136 and the stationary contact 134, And the height h of the arc elongating member 160 is set to cover the movable contact 136 and the fixed contact 134 so as to easily extend the arc A .

Further, in the present invention, since the arc stretching member 160 is detachably coupled to the housing 132, the manufacturing process is simplified and mass production is facilitated, resulting in a reduction in manufacturing cost. same.

In order to extend the arc, the housing may be formed of a metal, such as a metal, capable of inducing an arc. However, in this case, a structure for guiding an arc, for example, an arc-guiding protrusion protruded toward the arc side, must be formed, so that the structure of the housing becomes complicated. Therefore, the housing having such a structure is difficult to manufacture, and it is impossible to actually mass-produce the housing. Even if the housing is successfully mass-produced, the manufacturing cost is greatly increased.

In contrast, in the present invention, the arc elongating member 160 is separately formed from the housing 132, and the arc elongating member 160 is detachably coupled to the housing 132 to manufacture a relay having the arc elongating member 160 The structure of the arc elongating member 160 and the housing 132 can be relatively simplified, mass production becomes possible, and manufacturing cost can be reduced.

In the above description, the arc elongating member 160 has a plurality of rectangular arc inducing portions 160b. However, the arc elongating member 160 of the present invention is not limited to this specific shape. The arc elongating member 160 of the present invention can be of any shape as long as it can smoothly extend the arc A generated between the movable contact 136 and the stationary contact 134.

Particularly, the elongation of the arc A is determined by the interval when the movable contact 136 and the fixed contact 134 are separated from each other, the sectional area of the movable contact 136 and the fixed contact 134, 134 and so on, the shape and size of the arc elongate member 160 are determined according to these various factors.

6A and 6B are diagrams showing examples of arc elongating members having various structures. Of course, although the arc stretching member of the present invention is not limited to such a structure, another structure of the arc stretching member will be described with reference to the drawings.

6A, the arc elongating member 160 of this structure includes an arc inducing portion 160b formed in the main body 160a and guiding an arc generated between the movable contact 136 and the stationary contact 134 Sectional shape is a circular shape. That is, in the arc elongating member having the structure shown in FIG. 3, the arc inducing portion 160b has a rectangular cross-section, whereas the arc inducing portion 160b of the arc elongating member 160 having the structure shown in FIG. It is possible to smoothly induce the arc generated between the movable contact 136 and the stationary contact 134 by the arc guiding portion 160b even in a circular cross section.

In addition, the cross-sectional shape of the arc guide portion 160b is not limited to a rectangular shape or a circular shape, but may have various shapes such as a triangular shape and a pentagonal shape.

As shown in Fig. 6B, the arc elongating member 162 of this structure is arranged along the inner wall of the housing 132 in a triangular-shaped cross-section. At this time, the arc elongating member 162 is formed of a conductive material such as metal, and an arc generated between the movable contact 136 and the stationary contact 134 is elongated by the arc elongating member 162 .

3 and 6A, the arc elongating member 160 is composed of a separate body 160a and an arc inducing portion 160b, and an arc is induced by the arc inducing portion 160b made of metal. On the other hand, The arc elongating member 162 having the structure shown in FIG. 6A is not formed separately from the main body and the arc guiding portion, and the arc elongating member 162 itself induces the arc as an arc guiding portion made of metal. Of course, the arc stretching member 162 of this structure also has a protruding coupling portion and is coupled with the housing 132. [

As described above, since the arc elongating member 162 of this structure is made of metal and induces an arc, a separate main body is not required. In the drawing, the arc elongating member 162 has one triangular prism shape in cross section, but a plurality of prism shapes may be disposed. Further, the arc elongating member 162 may be formed of a metal having a circular section or a polygonal section.

7 is a diagram illustrating a structure of a relay according to a second embodiment of the present invention. Since the relay of this structure is similar in structure to the relay of the first embodiment except for the arc stretching member, the same structure will be described briefly and only the other structure will be described in detail.

7, the relay 203 of this embodiment includes a fixed contact 234 and a movable contact 236, a shaft 238 and a contact spring 248 inside the housing 232, a case 230, And includes an electric actuator composed of an exciting coil 242, a stator 243, a mover 246, and a return spring 244 disposed inside. At this time, the shaft 238 passes through the case 230 at the housing 232.

The arc stretching member 260 is disposed outside the housing 232. The arc elongating member 260 may be formed entirely of metal or may have an arc guide portion formed of metal in a separate body. In addition, the shape thereof may be variously shaped like the shape disclosed in the first embodiment.

The arc elongating member 260 may be disposed along the entire circumference of the housing 232 or may be arranged to surround some of the surfaces. At this time, protrusions or grooves are formed in the arc elongating member 260, grooves or protrusions are formed in the housing 232, and the grooves are inserted into the protrusions so that the arc elongating member 260 is detachably coupled to the housing 232 . Of course, other coupling means may be provided in the housing 232 and the arc elongating member 260 instead of the groove or the projection.

As described above, in the relay 203 of this embodiment, the arc elongating member 260 is disposed outside the housing 232, unlike the relay of the first embodiment. In the relay 203 of this embodiment, however, an arc between the stationary contact 234 and the movable contact 236 is elongated by the arc elongating member 260 and the current between the stationary contact 234 and the movable contact 236 It is possible to promptly control the motor or the like by quickly shutting off the flow.

Of course, unlike the first embodiment, in this embodiment, a housing 232 made of a dielectric material such as ceramic is gradually disposed between the arc elongating member 260 and thus influences the induction of the arc, The arc stretching member 260 may be designed in consideration of the insulation characteristics of the arc-welding electrodes 232 and 232 to smoothly extend the arc.

In other words, the arc elongating member 260 of this embodiment has the opposite area size and spacing of the stationary contact 234 and the movable contact 236, the intensity of the applied voltage, the contact between the stationary contact 234 and the movable contact 236 The arc is stretched smoothly by designing factors such as the distance between the arc-stretching member 260 and the material and thickness of the housing 232. As a result, the motor and the like can be accurately controlled.

As described above, according to the present invention, an arc elongating member is provided in a relay to extend an arc length by inducing an arc generated at a stationary contact and a movable contact, and an arc can be quickly removed according to elongation of an arc , The current flow caused by the arc can be cut off. As a result, it is possible to quickly supply and cut off the current applied to the motor or the parts of the electric vehicle, thereby enabling accurate control of the motor and the parts.

Further, in the present invention, since the arc elongating member is detachably assembled inside or outside the housing of the relay, it is possible to form it separately from the housing of the relay. As a result, the manufacturing process of the arc elongated member of simplified shape can be simplified and the manufacturing cost can be reduced.

Meanwhile, although the relays of the specific structure are described in the above detailed description, the present invention is not limited to the relays of this specific structure. The present invention is characterized in that the arc elongating member is manufactured separately from the housing of the relay to relatively simplify the shape of the arc elongating member and the manufactured arc elongating member is detachably attached to the relay. Thus, if the arc elongate member can be separately fabricated and detachably attached, all currently known structures of relays may be included in the present invention.

Further, although the above-described detailed description describes that the relay of the present invention is used in an electric vehicle, it is exemplified that the relay is applied for convenience of explanation. The relay of the present invention can be applied not only to an electric vehicle but also to a hybrid vehicle including both an electric vehicle and an engine, as well as to various industrial equipments and machines.

101: Battery section 103: Relay
104: vehicle control unit 105: converter
106: Startup unit 108: Battery management unit
130: Case 132: Housing
134: Fixed contact 136: Movable contact
138: shaft 160: arc elongate member

Claims (8)

Fixed contact;
A movable contact which is brought into contact with and separated from the fixed contact;
A shaft connected to the movable contact to move the movable contact;
A housing for accommodating the stationary contact and the movable contact;
An actuator for driving the shaft;
And an arc elongating member detachably attached to the housing to elongate an arc generated between the stationary contact and the movable contact. 2. The actuator according to claim 1,
An exciting coil for generating an electromagnetic force;
A stator and a movable element vertically disposed in the exciting coil;
And a return spring disposed between the stator and the mover and returning the mover back to the original position. The relay according to claim 1, wherein the housing is made of ceramic. The arc-expanding member according to claim 1,
A body disposed within the housing;
An arc inducing part formed on a first surface of the main body and flowing an arc; And
And a first coupling portion formed on a second surface of the main body and coupled with the housing. The relay according to claim 4, wherein the arc guide portion is made of a metal. [5] The relay according to claim 4, wherein the arc guide portion is formed of at least one protrusion formed in a circular or polygonal shape. The relay according to claim 4, wherein a second coupling portion is formed on an inner wall of the housing to be coupled to the first coupling portion. The relay according to claim 7, wherein the first engaging portion and the second engaging portion are protrusions and grooves, respectively.

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