JP2006196372A - Power relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power relay of a structure in which arc, which is generated when a control contact is opened by leading in a leak magnetic flux at switching on of a switching-on coil, is extended and in which, even if a plate spring installed with a movable contact is damaged by the arc generated, the contacting and separation action of the control contact is not affected greatly. <P>SOLUTION: The power relay has a structure in which when a control contact 4 consisting of a movable contact 42 and a fixed contact 41 is opened and the current is shut off by switching on the switching-on coil 6 provided at a yoke 2, a part of the magnetic flux generated at the yoke 2 is led to the control contact 4 and the discharge arc generated between the movable contact 42 and the fixed contact 41 is extended. The movable contact 42 is constructed on a plate spring 8 contacting an operating member 3, and the plate spring 8 has a projection member P which terminates extension of the arc on at least either right and left side end of the movable contact. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a power relay having a structure in which an arc generated when a control contact is opened to interrupt a current is extended by a magnetic force.

  This type of conventional power relay switches the energizing coil, opens and closes the operating piece, and contacts and separates the movable contact and fixed contact. At that time, arc discharge generated between the contacts The control contact and its peripheral part may be damaged.

The following patent document describes a self-holding type relay that extends an arc discharge generated between contacts to blow out by applying a magnetic flux generated when a current-carrying coil is energized.
Japanese Utility Model Publication No. 51-63143

However, when trying to extend such an arc, the other part other than the contact is damaged by the moved arc.
That is, in such a relay, when the operation of opening the control contact is performed, it is usually provided on the leaf spring in order to apply an elastic force to the movable contact and separate it from the fixed contact. If arc discharge occurs frequently, the leaf spring may be damaged. In such a case, the spring constant changes, the control contact cannot be normally connected and disconnected, and the reliability of the power relay is impaired. There was a problem.

  The present invention has been proposed in order to solve the above problem, and its purpose is to specify a projecting piece provided at a side end of the leaf spring as a terminal point for extending the arc, thereby damaging the leaf spring. However, it is to provide a power relay that does not significantly affect the contact / separation operation of the control contact.

  In addition, the second object is to replace the projecting piece described above with a power relay having a function of protecting the leaf spring from damage by guiding the arc extension to two fixed terminals further away from the leaf spring. It is to provide.

  The power relay according to the first aspect of the present invention proposed in order to achieve the above-described object is characterized in that an energizing coil is wound, a yoke with a built-in magnet, and energization to the energizing coil are switched. A control contact that reciprocates between the open position and the closed position by the magnetic flux generated in the yoke, and a control contact that opens and closes current by moving the fixed contact to and from the movable contact. When the operating piece is moved to the open position and the control contact is opened to interrupt the current, a part of the magnetic flux generated in the yoke by the energizing coil is guided to the control contact side. In the power relay in which the arc generated between the movable contact and the fixed contact is extended and extinguished, the movable contact is configured on a leaf spring that contacts the operating piece, and the leaf spring includes , At least left and right of the movable contact The side end of Zureka, characterized in that it forms a protruding piece to terminate stretching of the arc.

  A second aspect of the present invention is characterized in that, in the first aspect, the protruding piece has a tip formed in a spire shape.

  A third aspect of the present invention is characterized in that, in the first aspect, the projecting piece has a plurality of small projecting pieces each having a tip formed in a spire shape.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the projecting piece is formed with a rib strip that projects to the fixed contact side and extends from the movable contact to the side end of the leaf spring.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the protruding piece is formed on the lower side of the movable contact.

  According to a sixth aspect of the present invention, in the first aspect, the leaf spring is provided with an arch-shaped magnetic body having an inner surface facing the movable contact side instead of the protruding piece.

  The power relay according to the second aspect of the present invention proposed at the same time according to claim 7 is a magnetic flux generated in the yoke by winding a current-carrying coil and switching a current to the current-carrying coil by switching a current to the current-carrying coil. An operating piece that reciprocates between an open position and a closed position, and a movable contact that receives the movement of the operating piece, and a control contact that opens and closes a fixed contact to open and close the current. Is moved to the open position, and when the control contact is opened to interrupt the current, a part of the magnetic flux generated in the yoke by the energizing coil is guided to the control contact side, thereby fixing the movable contact. In the power relay in which an arc generated between the contacts is extended and extinguished, the fixed contact is provided on a first fixed terminal disposed to face the leaf spring, and the plate The spring includes the first fixed terminal and An arc horn that is curved in a direction away from the first fixed terminal is formed such that the separation distance increases toward the side end of the leaf spring, and the separation distance from the first fixed terminal is further increased. The second fixed terminal is provided so as to be smaller than the separation distance from the tip of the horn and set to the same potential as the leaf spring.

  According to the power relay of the first aspect of the present invention described in claims 1 to 5, the side end of the leaf spring provided with the movable contact that generates an arc with the fixed contact when the control contact is opened is provided at the side end of the leaf spring. Since the projecting piece for guiding and terminating the arc is formed, damage to the leaf spring body can be prevented by guiding the arc there.

  In addition, since the protruding piece is located at the side end of the leaf spring body away from the location where the movable contact is provided, even if it is damaged, the spring constant is greatly changed, affecting the normal contact / separation operation of the leaf spring. Little to give.

  In the second and third aspects, since the tip of the protruding piece has a spire shape, the electric field strength is increased and the arc easily moves to the protruding piece. In particular, the third aspect of the present invention has a plurality of small projecting pieces whose tips are spire-shaped, so that the portions where the arc is extended can be dispersed, which is beneficial.

  According to the fourth aspect of the present invention, the rib strip formed along the extending direction of the arc functions as a guide when the arc is extended, so that the arc can be quickly extended to the protruding piece.

  According to the fifth aspect, since the protruding piece is formed on the lower side of the movable contact, even if the protruding piece is damaged, the spring constant of the leaf spring is not greatly changed.

According to the sixth aspect of the present invention, since an arch-shaped magnetic body is provided instead of the projecting piece and the arch-shaped inner surface is directed to the movable contact side, an arc can be guided there.
Also, by attaching a magnetic material, the movement of the arc can be made quicker, the load on the contact point can be increased, and therefore bounce can be reduced.

In the power relay of the second aspect of the present invention described in claim 7, instead of the projecting piece which is a requirement of the first aspect of the present invention, an arc horn and a second fixed terminal having the same potential as this are provided. Therefore, after the arc is guided to the side end of the leaf spring by the arc horn, the arc can be extinguished by jumping between the first fixed terminal and the second fixed terminal.
Further, since the arc horn can be formed by bending a leaf spring, it is not necessary to attach another member.

  Embodiments of the present invention will be described below with reference to the drawings.

6A to 6C are schematic cross-sectional views showing the structure when the present invention is applied to a power relay. Here, (a) is a schematic sectional view when the relay is viewed from above, (b) is a schematic sectional view when the relay is viewed from the front, and (c) is a schematic sectional view when the relay is viewed from the side. FIG.
XX, YY, and ZZ indicate cutting lines when viewed from the side, upper, and front, respectively.

The power relay R is configured on an insulating base 1 and is a block body that is entirely covered with an insulating case 5.

The insulating base 1 is made of a thick and highly insulating resin, and has a through hole 11 and a recess 12. A yoke 2 having a “U” -shaped cross section is inserted and fixed in the through hole 11. Below the insulating base 1, the leg portion T 1 B of the first fixed terminal T 1, the second portion The leg portion T2B of the fixed terminal T2 and the pair of coil energizing terminals T3 and T4 are projected.
Reference numeral 14 denotes a vertically long groove formed in the insulating base 1, and the arc generated when the movable contact 42 is separated from the fixed contact 41 is further extended by applying a leakage magnetic flux to be described later. When the metal vapor or carbon powder generated in the vicinity of the main body portions T1A and T2A of the fixed terminal 2 is dropped, the insulation deterioration of the insulating base 1 and the first and second fixed terminals A short circuit between T1 and T2 is prevented.

  The yoke 2 is made of, for example, pure iron or a semi-hard magnetic material, and a current-carrying coil 6 is wound around one side of a “U” -shaped main body formed with a gap 23, and a protruding bin 7 is attached. A permanent magnet 9 is embedded on the side facing the magnetic pole shown in FIG. 6B, and two protrusions 21 and 21 for swingingly supporting the operating piece 3 as an actuator are provided at the upper end thereof. Forming.

  Similarly to the yoke 2, the operating piece 3 is a plate made of a magnetic material, and is sucked into or released from the gap 23 of the yoke 2, and a first free end 31 which will be described later. An intermediate portion with the second free end 32 that applies a pressing force to the control contact 4 is bent to form a “<” shape, and in the vicinity of the bent portion 33, the two protrusions 21 of the yoke 2, Cutout portions 35, 35 into which 21 is inserted are formed, and the operating piece 3 is supported by the cutout portions 35, 35 so as to be swingable in contact with the yoke 2.

  Further, the second free end 32 side of the operating piece 3 is covered with a card 34 made of an insulating material such as a resin, and the card 34 is provided with a projection 36 protruding to the control contact 4 side. .

  The control contact 4 is the same as the first fixed terminal T1 and the fixed contact 41 provided on the screen-shaped main body T1A of the first fixed terminal T1 formed of a material having good conductivity such as copper on a thick plate. It is composed of a movable contact 42 provided on the leaf spring 8 riveted 81 to the horizontal portion of the arcuate body portion T2A of the second fixed terminal T2 made of a material. The movable contact 42 comes into contact with the fixed contact 41 by receiving the pressure of the projection 36 formed on the card 34 of the operating piece 3 and curves, so that the first fixed terminal T1 and the second fixed energization terminal T2 are contacted. The electric circuit is closed between and the current is passed.

  The leaf spring 8 is made of a non-magnetic material with high electrical conductivity, such as a copper plate, and has a movable contact 42 in the center. A pair of projecting pieces P are provided at both ends of the movable contact 42 as a center. Since this protrusion piece P is a principal part of this invention, it mentions later.

Further, the protrusion 36 formed on the card 34 covering the second free end 32 side of the operating piece 3 moves to the closed position when the free end 31 of the operating piece 3 is sucked by the opening end of the yoke 2. Then, the protrusion 36 of the card 34 presses the leaf spring 8 to bring the movable contact 42 into contact with the fixed contact 41. However, the energization to the energizing coil 6 is switched and the free end 31 of the operating piece 3 is connected to the yoke. If it moves to the open position released from the open end of 2, the leaf spring 8 releases the pressure accordingly, and the movable contact 42 is separated from the fixed contact 41.
Here, the material of the fixed contact 41 and the movable contact 42 may be Ag / Cu, AgCdO / Cu, AgNi / Cu, or AgSnO2 / Cu alloy. It is excellent in weldability.

  7A and 7B are cross-sectional views for explaining the basic operation of the power relay R. FIG.

  In this power relay R, by switching the energization to the energizing coil 6, the free end 31 of the operating piece 3 is attracted and released to the open end of the yoke 2, so that the operating piece 3 is moved between the open position and the closed position described above. Here, FIG. 7A shows a state where the operating piece 3 is in the closed position, and FIG. 7B shows a state where the operating piece 3 is in the open position.

  7A, when the operating piece 3 is in the closed position, the protrusion 36 provided on the card 34 that covers the operating piece 3 strongly presses the plate spring 8, and is fixed to the plate spring 8. Although the movable contact 42 and the fixed contact 41 provided on the first fixed terminal T1 are in contact with each other, the protrusion 36 also receives the elastic restoring force of the leaf spring 8, so this restoring force is It is transmitted to the operating piece 3 and acts to separate the first free end 31 from the open end of the yoke 2.

  In this state, the magnetic flux ΦM (shown by a solid line) generated from the magnet 9 is generated when the first free end 31 of the operating piece 3 is formed in close contact with the open end of the yoke 2 and the operating piece. 3 and the right loop path forming a large gap between the second free end side 32 and the yoke 2 circulates, but the right loop path has a large magnetoresistance due to the gap. In addition, most of the magnetic flux passes through the left loop path.

  Therefore, if the energization of the energizing coil 6 is interrupted, the magnetic force that attracts the first free end 31 of the operating piece 3 to the opening end of the yoke 2 overcomes the elastic force of the leaf spring 8 and the operating piece 3 It is held stationary in the closed position.

  In this state, when a current is applied to the energizing coil 6, the magnetic flux Φm (shown by a broken line) generated from the energizing coil 6 is divided into the left loop path and the large loop path via the second free end 33. However, in the left loop path, the magnetic flux generated from the magnet 9 and the magnetic flux generated from the energizing coil 6 cancel each other because their directions are opposite to each other. The free end 31 is released from the open end of the yoke 2 and the operating piece 3 moves to the open position.

  On the other hand, the magnetic flux generated from the energizing coil 6 has the same direction as the magnetic flux generated from the magnet 9 around the gap between the second free end 32 of the operating piece 3 and the yoke 2. 9 is added to the magnetic flux generated from 9. As a result, the second free end 32 of the operating piece 3 is attracted to the yoke 2, and this state is maintained even after the energization is interrupted (latched to the open position).

  The operation of the latch relay R will be described with reference to FIG. 7B. When the operating piece 3 is in the open position, the projection 36 provided on the card 34 covering the operating piece 3 presses the leaf spring 8. Therefore, the movable contact 42 fixed to the leaf spring 8 and the fixed contact 41 provided on the first fixed terminal T1 are separated by the elastic force of the leaf spring 8.

  Further, in this state, the magnetic flux ΦM generated from the magnet 9 causes the left loop path of the magnet 9 having the first free end 31 of the operating piece 3 and the open end of the yoke 2, and the second loop of the operating piece 3. The free end 32 and the right loop path of the magnet 9 with a small gap between the yoke 2 circulate, but the left loop path has a larger magnetoresistance, so that most of the magnetic flux Go through the loop path.

  Therefore, if the energization of the energizing coil 6 is interrupted at this time, the magnetic force for attracting the first free end 31 of the operating piece 3 to the opening end of the yoke 2 causes the second free end 32 of the operating piece 3 to be attracted. Since it becomes smaller than the magnetic force attracted to the yoke 2, the second free end 32 is pressed against the yoke 2, so that the operating piece 3 is held stationary in the open position.

  In this state, when the energizing coil 6 is energized in the opposite direction, the magnetic flux Φm generated by the energizing coil 6 is divided into the left loop path and the large loop path passing through the second free end 33. In the loop path on the left side, the magnetic flux ΦM generated from the magnet 9 and the magnetic flux Φm generated from the energizing coil 6 are added in the same direction, so that the first free end 31 of the operating piece 3 is As a result, the operating piece 3 is moved to the closed position. And if the 1st free end 31 of the action piece 3 is attracted | sucked by the opening end of the yoke 2, after that, even if it interrupts energization, this state will be hold | maintained with the magnetic flux by the magnet 9, and a closed state will be maintained. (Latched to the closed state).

  Further, in this power relay R, since the second free end side 32 of the operating piece 3 is extended to the vicinity of the movable contact 42, when the energizing coil 6 is energized and the control contact 4 is opened. The magnetic flux ΦM generated from the magnet 9 and the magnetic flux Φm generated from the energizing coil 6 merge in the same direction and become a leakage magnetic flux, which is induced to be orthogonal between the fixed contact 41 and the movable contact 42. In the relay R of the embodiment, the generated arc is extended to the protruding piece P provided at the side end of the leaf spring 8 and extinguished by such a principle.

  By the way, at the moment when the fixed contact 41 and the movable contact 42 are separated from each other, the potential difference between the two increases rapidly due to the inductive component of the circuit. The arc current generated in this case is mainly composed of charged particles such as thermoelectrons emitted from the fixed contact 41 and the movable contact 42 and evaporated metal vapor as heat is generated.

  Since the charged particle velocity vector and the surrounding magnetic flux vector intersect each other, the Lorentz force vector acting on the charged particle is determined by the charged particle velocity vector and the magnetic flux vector according to Fleming's left-hand rule. As a cross product, the trajectory of the charged particles acts so as to be a circular trajectory on a plane orthogonal to the magnetic flux vector.

  Further, since the electric field between the first fixed terminal T1, the second fixed terminal T2, and the leaf spring 8 acts on the charged particles simultaneously with the Lorentz force, the fixed contact 41 and the movable contact 42 The arc, which is an assembly of them generated in the meantime, is bent while moving to the side end of the fixed terminal T1 and the leaf spring 8, and thereafter the potential difference between the fixed terminal T1 and the leaf spring 8 is reduced, Disappears when the voltage required to maintain the discharge is insufficient due to the resistance increase (extinguishing action) of the path due to the arc discharge curvature.

In addition, since the direction of the curve and movement of the arc discharge differs depending on the direction of the current, when the current due to the arc discharge flows from the fixed contact 41 side to the movable contact 42 side, and when the current flows in the opposite direction , Curving and moving direction are also opposite.

  Next, an embodiment of a leaf spring that is a main part of the present invention will be described.

  FIG. 1A shows an example of a leaf spring 8 having a protruding piece P. FIG. 1B shows a leaf spring 8 in which a rib strip Pr is added to the protruding piece P shown in FIG. Is shown.

  In FIG. 1, the protruding protrusion P is formed on the left and right ends of the movable contact 42 of the leaf spring 8, that is, on both ends of the leaf spring 8, but one end side where the arc is extended. You may form in. If it is provided on both left and right side ends, it is possible to cope with the case where the moving direction of the arc cannot be specified.

  According to such a structure, the stretched arc is guided to the projecting piece P, and the portion is damaged. Therefore, the spring constant of the leaf spring 8 is greatly changed, and the normal contact / separation operation of the leaf spring 8 is performed. Will not be disturbed.

The leaf spring 8 is fixed to the above-described second fixed terminal and constitutes an electric circuit together with the second fixed terminal. Therefore, the leaf spring 8 is formed of a copper plate or the like which is a nonmagnetic material having excellent conductivity. P is preferably formed of the same material as the leaf spring 8.
If the same material is used, the projecting piece can be formed integrally only by cutting the sheet metal. Moreover, if it is integrally formed, the protruding piece will not be separated and dropped unlike the case where other members are attached.

  Further, in FIG. 1B, the rib strip Pr that protrudes toward the fixed contact 41 side along the extending direction of the arc, that is, the direction extending from the movable contact 42 provided at the center of the leaf spring 8 to the protruding piece P is further provided. Although it is formed, if such a rib strip Pr is formed, it becomes a guide for the movement of the arc, and the arc can be quickly moved to the protruding piece P.

  2A and 2B are diagrams showing examples of other shapes of the protruding pieces.

  In FIG. 2 (a), the leaf spring 8 is provided with a projecting piece Pa having a spire shape at the tip. However, with such a spire shape, the electric field strength is increased at the tip of the projecting piece Pa, and the arc projects. It becomes easy to move to the piece Pa.

  Further, in FIG. 2B, since a plurality of small projecting pieces Pb, Pb... Each having a spire shape at each tip are formed in a sawtooth shape, the damaged portions are dispersed and the leaf spring 8 is dispersed. Can extend the service life.

  FIG. 3A shows another example of a leaf spring having a protruding piece. In FIG. 3B, a rib strip serving as a guide for arc movement is formed on the projecting piece shown in FIG. In addition, the code | symbol in a figure attaches | subjects the same thing as FIG.

  In these examples, since the protruding piece P is formed below the movable contact 42, even if the protruding piece P is damaged by an arc, the spring constant of the leaf spring 8 is not greatly affected.

  In FIG. 3 (b), the rib strip Pr for guiding the arc movement is formed so as to go from the movable contact 42 to the projecting portion P formed to project below the movable contact 42. Therefore, the arc is the rib strip Pr. The factor that changes the spring constant of the spring plate further can be reduced.

  Next, a configuration in which the extension of the arc is terminated by a member that replaces the protruding piece will be described.

  FIG. 4 shows an example in which an arch-shaped magnetic body M is provided on the leaf spring 8.

  One set of arch-shaped magnetic bodies M is provided with each semicircular arc-shaped inner surface Ma facing the movable contact 42 side. Since the magnetic body M is formed in a semicircular shape and the inner surface Ma is directed to the contact side, the arc can be attracted and the movement of the arc can be accelerated.

  Moreover, since the load of the contact part of the leaf | plate spring 8 increases by attaching the magnetic body M, a bounce can be reduced.

  FIG. 5 shows an example in which an arc horn is provided instead of the protruding piece, and shows the control contact as viewed from above.

Here, the arc horn H is provided on the leaf spring 8 and on the side of the movable contact 42 so as to bend and project on both side ends of the leaf spring 8, and the projecting portion becomes the side end. Accordingly, the distance L2 from the first fixed terminal T1 provided with the fixed contact 41 is gradually increased, that is, curved away from the first fixed terminal T1.
Further, a second fixed terminal T2 is provided on the side of the first fixed terminal T1, and the second fixed terminal T2 is separated from the first fixed terminal T1 by a distance L1 from the tip of the arc horn. Are arranged so as to be smaller than the separation distance L <b> 2, and are at the same potential as the leaf spring 8.

  According to such a structure, when the arc generated between the fixed contact 41 and the movable contact 42 moves to the side end of the leaf spring 8, that is, the tip of the arc horn H (10 in FIG. 5), the further The arc that can no longer be maintained jumps to the gap between the first fixed terminal T1 and the second fixed terminal T2 that is at the same potential as the leaf spring 8, and is extinguished (10 in FIG. 5). ´).

  Since such an arc horn H can be formed by bending the leaf spring 8, it can be easily manufactured without requiring other members. In addition, since no other members are used, there is no fear of separation or dropping during use.

(A) is a front view of the movable contact part which shows an example of the leaf | plate spring which has the protrusion piece which makes the principal part of this invention. (B) is a figure which shows the leaf | plate spring which formed the rib strip on the protrusion piece shown by (a). (A), (b) is a figure which shows the other example of a protrusion piece. (A) is a front view of the movable contact part which shows the other example of the leaf | plate spring which has a protrusion piece. (B) is a figure which shows the leaf | plate spring which formed the rib strip on the protrusion piece shown by (a). It is a front view of the movable contact part which shows the example of the leaf | plate spring which provided the arch-shaped magnetic body. It is a front view explaining the example of the leaf | plate spring which provided the arc horn and the 2nd fixed terminal. It is a figure which shows the structure of the power relay by which this invention is implemented, (a) is a top view, (b) is a YY line schematic sectional drawing, (c) is a XX line schematic sectional drawing. (A), (b) is a figure explaining the basic operation | movement of the power relay of this invention.

Explanation of symbols

R power relay 2 yoke 3 operating piece 4 control contact 41 fixed contact 42 movable contact 6 energizing coil 8 leaf spring 9 magnet T1 first fixed terminal T2 second fixed terminal P protruding piece Pa protruding with spire-shaped end Piece Pb Spire-shaped small projecting piece Pr Rib strip H Arc horn M Arch-shaped magnetic body

Claims (7)

This is an operation piece in which a current-carrying coil is wound and a yoke with a built-in magnet is switched between the open position and the closed position by switching the current to the current-carrying coil to generate a reciprocating motion between the open position and the closed position. A movable contact that receives the movement of the piece, and has a control contact that opens and closes the current by moving the fixed contact, and when the operating piece is moved to the open position and the control contact is opened to cut off the current Is a power relay in which the arc generated between the movable contact and the fixed contact is extended and extinguished by guiding a part of the magnetic flux generated in the yoke by the energizing coil to the control contact side.
The movable contact is configured on a leaf spring that contacts the operating piece, and a projecting piece that terminates the extension of the arc is formed on at least the left or right side end of the movable contact. A power relay characterized by In claim 1,
The projecting piece has a tip formed in a spire shape, and is a power relay. In claim 1,
The power relay, wherein the protruding piece has a plurality of small protruding pieces each having a spire shape at each tip. In claim 1,
The power relay, wherein the protruding piece protrudes toward the fixed contact and forms a rib strip extending from the movable contact to a side end of the leaf spring. In any one of Claims 1-5,
The power relay, wherein the protruding piece is formed below the movable contact. In claim 1,
The power relay according to claim 1, wherein the leaf spring is provided with an arch-shaped magnetic body having an inner surface directed toward the movable contact instead of the protruding piece. This is an operation piece in which a current-carrying coil is wound and a yoke with a built-in magnet is switched between the open position and the closed position by switching the current to the current-carrying coil to generate a reciprocating motion between the open position and the closed position. A movable contact that receives the movement of the piece, and has a control contact that opens and closes the current by moving the fixed contact, and when the operating piece is moved to the open position and the control contact is opened to cut off the current Is a power relay in which the arc generated between the movable contact and the fixed contact is extended and extinguished by guiding a part of the magnetic flux generated in the yoke by the energizing coil to the control contact side.
The fixed contact is provided on a first fixed terminal disposed to face the leaf spring; and
The leaf spring is formed with an arc horn that is curved in a direction away from the first fixed terminal so that a separation distance from the first fixed terminal increases as the side end of the leaf spring increases.
Furthermore, a second fixed terminal that is arranged so that a distance from the first fixed terminal is smaller than a distance from the tip of the arc horn and is set to the same potential as the leaf spring is provided. A power relay characterized by

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