JPS6072122A - Polarized electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a polarized electromagnetic relay, and more particularly to a slim-type polarized electromagnetic relay in which constituent members are arranged side by side on an insulating base.

[Background of the invention]

Generally, a polarized electromagnetic relay includes at least one permanent magnet and an excitation winding as electromagnetic driving means, and the magnetic action of these electromagnetic driving means operates a armature to bring contact members into and out of contact. The operational feature of this relay is that the contact/open state of the contact members can be maintained in a monostable or bistable manner depending on the arrangement conditions of the electromagnetic drive means. The scope of application of this type of relay can extend from various communication devices to general home appliances (televisions, room coolers, etc.). In recent years, especially in the case of application to communication equipment, which has tended to be smaller and more highly integrated, it is important to have a size and shape that can be mounted on a printed wiring board together with extremely miniaturized electronic components without occupying as much space as possible. desired. In general, in general communication equipment, circuit components are mounted on printed wiring boards and packaged, and multiple circuit components are installed side by side in a mounting frame (package L7). As an electromagnetic relay, it is particularly necessary to have a flat shape with a limited height dimension.

Various flat type polarized electromagnetic relays have already been proposed. - As a polarized electromagnetic relay applied to home appliances, especially televisions and room coolers,
Because these devices tend to mount components with relatively high dimensions, such as large capacitors, on printed wiring boards,
It is preferable that the device has a slim shape that limits the mounting area on the printed wiring board surface, allowing effective use of space. Furthermore, it is desired that the contact opening/closing capacity be large. However, a polarized electromagnetic relay that satisfies these requirements has not been realized to date.

[Purpose of the invention]

An object of the present invention is to provide a slim-shaped polarized electromagnetic device which can limit the mounting area by arranging a winding assembly and a permanent magnet assembly constituting an electromagnetic drive means in parallel with each other on an insulating base together with a contact spring body. Our purpose is to provide relays.

Another object of the present invention is to improve productivity by assembling relay components by fitting them into an insulating base, and in particular to reduce costs due to automatic assembly, and without significantly changing placement force. An object of the present invention is to provide a polarized electromagnetic relay that can perform either monostable or bistable operation.

Still another object of the present invention is to provide a polarized electromagnetic relay that can easily increase the contact gap and contact force to increase the contact switching capacity.

[Summary of the invention]

The polarized electromagnetic relay according to the present invention includes a first wall portion erected at approximately the middle of an extending base so as to cut off both ends of the base in the longitudinal direction; an insulating base having second and third walls connected to the section and erected so as to form a substantially U-shaped cross section, and a protrusion provided on the first wall; the base; a first magnetic plate that is flatly arranged above and has one end sandwiched between the base and the abutment; a first magnetic plate that is sandwiched between the protrusion provided on the first wall and the second wall; a second magnetic plate erected along the second wall; and a third wall sandwiched between the protrusion provided on the first wall and the third wall. a yoke constituted by a third magnetic plate erected along the second and third yoke;
and a permanent magnet placed on the protrusion of the first wall with a magnetic pole part in contact with the magnetic plate;
A winding consisting of a magnetic bar erected at the other end of the first magnetic plate of the yoke, and a winding frame in which a hollow winding shaft around which an excitation winding is wound is fitted onto the magnetic bar. an assembly; a contact spring body erected at one end of the base and comprising at least one movable contact spring and at least two fixed contact springs; an armature whose other end is fitted to the magnetic bar of the winding assembly so as to selectively rotationally contact a magnetic plate; and a free end further extending beyond the one end of the armature. an armature assembly comprising a contact spring driver engaged with the movable contact spring; the insulating base, the permanent magnet assembly, the winding assembly;
A casing that accommodates the contact spring body and the armature assembly.

Further, one of ten thousand of the second and third magnetic plates of the permanent magnet assembly is integrally coupled to the one end of the first magnetic plate, and the other is integrally coupled to the one end of the first magnetic plate. It is characterized in that a monostable magnetic circuit is configured by being spaced apart from the magnetic circuit.

Further, the second and third magnetic plates are integrally coupled to the one end of the first magnetic plate of the permanent magnet assembly, and the magnetism between the second and third magnetic plates is integrally coupled to the one end of the first magnetic plate. A bistable magnetic circuit is constructed by providing a notch to prevent a short circuit.

Furthermore, the second magnetic plate is erected along the second wall on the opposing inner wall of the casing, and the third magnetic plate is erected along the third wall. It is characterized in that it is provided with a pair of ridge-like protrusions each holding a.

[Explanation of Examples]

Embodiments of the present invention will be described below with reference to the drawings. First, referring to FIG. 1 showing a perspective view of an embodiment of a polarized electromagnetic relay according to the present invention, and FIG. 2 showing a detailed structure of an insulating base in FIG. 1, an insulating base 1 is made of synthetic resin. A U-shaped insulating wall 1 is installed in the middle part of the base 1o.
A plurality of spring holding grooves 1 in which each plate spring 40°41.42 of the contact spring body is inserted into the end of the contact spring body.
2, and winding lead-out terminals 333, 33 at the other end.
A pair of grooves 131, 132 for pulling out the magnetic rod 4 and a four part 14 for accommodating the extra length of the lower end of the magnetic rod 30 forming the iron core are provided. Furthermore, the insulating wall 11 of the insulating base 1 includes a first wall portion 111 and second and third wall portions 112 and 11 that are connected to the first wall portion and are opposite each other and have a substantially U-shaped cross section.
It consists of 3. The first wall portion 111 includes a protrusion 15 on which the permanent magnet 20 is placed, and a protrusion 1 that abuts the upper surface of the permanent magnet 20.
6 is provided. In addition, the second and third wall portions 1
12 and 113 have projecting walls 171 and 172 respectively.Referring now to FIG. 3, permanent magnet assembly 2 and winding assembly 3 are shown. Permanent magnet assembly 2
is a permanent magnet 20 with magnetic poles “N” and “S” at both ends.
, a flat first magnetic plate 211, a second magnetic plate 212 integrally molded therewith and extending in the vertical direction, and this second magnetic plate 211.
A third magnet arranged opposite to the magnetic plate and holding the permanent magnet 20 therebetween.
The yoke 21 includes a magnetic plate 213 and a magnetic plate 213.

Note that here, the second magnetic plate 212 and the third magnetic plate 213
, and the second magnetic plate 212 is longer than the first magnetic plate 211 that constitutes the yoke 21.
and the third magnetic plate 213 are not directly magnetically coupled. Depending on the structure of this yoke 21, a monostable magnetic circuit can be constructed, as will become clear in the explanation of the operation described later. - The winding assembly 3 is constructed by fitting the small-diameter lower end 301 into the through hole 22 formed in the first magnetic plate 211 of the yoke 21 by crushing the second and third magnetic plates. 212, 213, a winding frame 31 fitted with the magnetic bar 30 as an iron core and erected on the first magnetic plate 211 of the yoke 21, and this winding. The first flange 32 and the second flange of the frame 31
The excitation winding 35 (see FIG. 1) is wound around the outer periphery of a winding shaft 34 that connects the flange 33 of the excitation winding 35 (see FIG. 1). The first flange 32 of the winding frame 31 is provided with an annular raised protrusion 321 that supports rotation of the armature, which will be described later.
Further, the second flange 33 is provided with grooves 331 and 332 for guiding the excitation winding 35 wound around the winding shaft 34, and winding lead-out terminals 333 and 33 for connecting the ends of the winding.
4 is implanted by press-fitting. The second flange 33 is further provided with a groove 335 for appropriately fitting the first magnetic plate 211 of the yoke 21. The permanent magnet assembly 2 and the winding assembly 3 are connected to the first magnetic plate 211 of the yoke 21.
It is assembled via a magnetic rod 3o that is erected. When assembling these assemblies 2 and 3 into the insulating base 1 having the configuration shown in FIG.
A permanent magnet 2 (1) is fitted between the protrusion 16 and a yoke 21.
The third magnetic plate 213 is fitted into the gap 11 between the third wall portion 113 and the protrusion 15. At this time, the protrusion 1 of the insulating wall 11
8 is engaged with the notch 2131 of the third magnetic plate 213, the lower end of the third magnetic plate 213 is connected to the first magnetic plate 21.
1 to a predetermined distance α. This distance forms the magnetic circuit necessary for monostable operation of the polarized electromagnetic relay. Note that it is not necessary to provide the protruding piece 2132 formed by the press construction method on the third magnetic plate 213, but the end of the first magnetic plate 211 of the yoke 21 is 2111 and the second part of the insulating wall 11
A second magnetic plate 2 is placed in the gap g3 between the wall 112 and the protrusion 15.
The permanent magnet assembly 2 and the winding assembly 3, which have already been integrally engaged as described above, are assembled into the insulating base 1 so that the lower ends 2121 of the permanent magnet assembly 12 fit together, respectively. Due to this assembly, the ends of the second flange 33 of the winding assembly 3 engage with the pair of protruding walls 171 and 172 of the insulating base 1, and Winding lead-out terminal 333.3
34 are located in the base 1° (lD grooves 131, 132, respectively. In this case, as clearly shown in FIG. 1, the insulating base l, the permanent magnet assembly 2 and the winding assembly 3 are firmly to fit.

The above-described permanent magnet assembly 2 constitutes a bistable type polarized electromagnetic relay, but in the case of a bistable type, a yoke of the permanent magnet assembly 2 may be configured as shown in FIG. 4. The yoke 21' consists of a flat first magnetic plate 2111, and second and third magnetic plates 212' and 213' having the same length and standing opposite to each other at the ends of the first magnetic plate 2111. It is constructed by integrally molding. Although not shown in FIG. 4, a permanent magnet 2o is inserted between the second magnetic plate 2121 and the third magnetic plate 213', similar to the permanent magnet assembly 2 shown in FIG. Ru.

The notch 23 formed by cutting the 7-shaped end of the first magnetic plate 211' in the direction of the other end is the magnetic The first magnetic plate 2111 and the second magnetic plate 2121 or the first magnetic plate 211' and the third magnetic plate 21 are provided to prevent short circuits.
Set the magnetic flux path between 31 and 31. Notch 2131' provided in third magnetic plate 213' and second magnetic plate 212
The first protruding piece 2132' is connected to the third magnetic plate 213 shown in FIG.
It works in the same way as the one provided in . The permanent magnet assembly 2 of the bistable polarized electromagnetic relay configured in this manner has the first
By fitting the small diameter lower end 301 of the magnetic rod 30 of the winding assembly 3 shown in FIG. 3 into the through hole 221 of the magnetic plate 211+ of . Both assemblies 2, 3 are assembled as described above into the insulating base 1 of the construction shown in FIG. Therefore, when configuring the magnetic circuit of the south pole electromagnetic relay as either a monostable type or a bistable type, the permanent magnet assembly 2 can be attached to the insulating base 1 and the winding assembly 3 without requiring structural changes. Can be assembled together.

However, if the insulating base 1 is not intended to be shared, there is no need to provide the protrusion 18 of the insulating base 1 constituting the bistable relay, and there is no need to provide the notch 2131' of the third magnetic plate 213+ of the yoke 211. It's fine. In this case, the protrusion 18 of the insulating base 1 constituting the monostable relay is not provided, and the yoke 2 is extended to the protrusion 15f and the third wall 113.
1, and the notch 2131 of the third magnetic plate 213 is also unnecessary.

Next, referring to FIG. 5, there is shown a contact spring body 4 incorporated into the insulating base 1 having the structure shown in FIG. The contact spring body 4 is attached to the spring holding grooves 12a, 12 of the insulating base 1.
It consists of a movable contact spring 4o and a pair of fixed contact springs 41 and 42, which are inserted into the contacts b and 12c from the direction of arrow A, respectively. The movable contact spring 4° is made by processing a highly flexible conductive spring material into a predetermined shape, and movable contact members 401a and 401b (401b not shown) are melted or crushed on both sides of the upper end. and has a hemispherical protrusion 40 on the upper edge that engages with a contact spring driver to be described later.
2 is provided. Furthermore, a claw 403 is provided at the bent lower end of the movable contact spring 4°, which comes into contact with the wall surface of the recess 121a of the groove 12a when inserted into the spring holding groove 12'a of the insulating base 1. - In case, the pair of fixed contact springs 41 and 42 are made of conductive plate material, fixed contact members 411 and 421 fc are respectively fixed to the upper ends, and spring holders are attached to the lower ends following the curved intermediate parts 412 and 422. Groove 12b
, 12c are provided with claws 413 and 423 that abut against the wall surfaces of the recesses 121b and 121c, respectively. Movable contact spring 4
0 claw 403 and fixed contact spring 41.42 claw 413.4
23 are the spring holding grooves 12a and 12 of the insulating base 1, respectively.
This prevents the contact springs 40, 41 and 42 from coming off from b and 12c.

The protrusions 404, 414, 424 provided at the lower ends of the contact springs 4o, 41.
, 12b; 12C from entering onto the base 10 of the insulating substrate 1.

Referring now to FIG. 6, armature assembly 5 is shown. The armature assembly 5 is composed of a rotating armature 50 made of a magnetic material and a contact spring driver 51 made of an insulator.The contact spring driver 51 has a through hole in a protrusion 501 of the armature 5o. After fitting 511, the protrusion 501
The curved fastening is done by welding the piece 52, the armature 5
It is assembled integrally with o. The integrated armature 50 (!: contact spring driver 51) is connected to the upper end of the magnetic bar 3o of the winding assembly 3 shown in FIG. The armature assembly 5 is assembled by fitting into the magnetic bar 302.
In order to be able to rotate using the armature 5o and the drive body 51 as rotation support shafts, the magnetic bar 3o is appropriately fitted into the through holes 502, 512 of the armature 5o and the driver 51. Also, the 6th
As can be understood more clearly by referring to FIG. 1 together with the drawings, the bifurcated rotating end portion 513 of the contact spring driver 51 is connected to the upper end protrusion 402 of the movable contact spring 4o that is already erected on the insulating base 1. to be locked. Further, the armature end portion 5 of the armature 5o
03 is located in the polar space between the second and third magnetic plates 212 and 213 of the permanent magnet assembly 2 which is incorporated into the insulating base 1 and stands facing each other. Note that the electrical withstand voltage between the armature 50 extending in this polar space and the contact spring body 4 is determined by the first wall portion 111 of the insulating wall 11 of the insulating base 1 (as clearly shown in FIG. 2).
This can be ensured.

From the above explanation, it can be understood that the polarized electromagnetic relay as shown in FIG. 1 is constructed.

Next, referring to Fig. 7, the explanation can be further explained.
The figure shows the housing 6 that houses the relay assembled as shown in FIG. 1 in a partially broken state. The casing 6 is molded into a predetermined shape from synthetic resin, and the inner wall surface of the first wall portion 60 is integrally molded with flat raised protrusions 601 and 602 and a stepped portion 603 connecting these protrusions. has been done. Further, although not shown, protrusions 611 and 612 and a stepped portion 613 are similarly provided on the inner wall surface of the opposing second wall portion 61. Here, the protrusions 601 and 602
holds the second wall portion 112 of the insulating base l, and this wall portion 1
The second magnetic plate 212 of the yoke 21 erected inside the 12
retain the arrangement. Further, the protrusions 611 and 612 sandwich the third wall 113 of the insulating base 1, and this wall 11
The arrangement of the third magnetic plate 213 of the yoke 21 erected inside the yoke 2 is maintained.

Further, in order to prevent the armature assembly 5, which is disposed on the winding frame 31 of the winding assembly 3 with the magnetic rod 30 as a rotation support shaft, from coming off, the inner wall surface of the third wall portion 62 is provided. A protrusion 621 that comes into contact with the contact spring driver 51 is provided. The third wall portion 62 is provided with a through hole 622 that functions as an injection hole for a sealed gas or a discharge hole for gas that has entered the housing 6 during sealing with a filler to be described later. The casing 6 thus constructed is fitted into the relay assembled as shown in FIG. 1 from the open bottom. Then, an insulating base 1. Permanent magnet assembly 22 Winding assembly 3, Contact spring body 4
．． In order to airtightly house the armature assembly 5, a filler is injected into the bottom side of the base 10 of the insulating base 10 that fits into the open bottom of the housing 6. After injecting the filler, reducing gas is injected through the negative through hole 622 provided in the third wall 62 of the casing 6 to close the through hole 622, thereby completing a sealed polarized electromagnetic relay. .

The operation of one embodiment of the polarized electromagnetic relay according to the present invention constructed as described above will be described below.

First, referring to FIG. 8(A) and FIG. 8(B), the magnetic circuit configuration when performing monostable operation will be described. During the period when the current 11 is supplied to the excitation winding 35,
As shown in Figure 8), the generated main magnetic flux Φ1 is transferred to the magnetic rod 30 - the armature 50 - the second magnetic plate 212 of the yoke 21 -
It passes through the first magnetic plate 211 of the yoke 21 - the magnetic bar 30 . Therefore, during this current supply period, the armature 50 is
is magnetically attracted to the magnetic plate 212 of. Also, although not shown in the figure, the contact (movable contact driven by the drive body 51) which is interlocked with the armature 50 is driven toward the fixed contact (the movable contact member 4013). and fixed contact side 41
1 comes into contact. When the current 11 to the excitation winding 35 is cut off to make it into a non-excited state, the magnetic attraction force becomes smaller than the repulsive force of the movable contact spring load, so as shown in FIG. 8(B), the armature 50 is a permanent magnet. 20 generates the third magnetism of the yoke 21 [213-armature 50-magnetic bar 30-yoke 2
1 first magnetic plate 211 - second magnetic plate 21 of yoke 21
The third magnetic plate 213 is magnetically attracted by the main magnetic flux Φ2 passing through the third magnetic plate 213. Therefore, the movable contact spring 40 driven by the contact spring driver 51 switches its movable contact member 401b into contact with the fixed contact member 421 of the fixed contact spring 42 . This contact state is maintained until the current 1 is applied to the excitation winding 35.

Next, referring to FIGS. 9(A) and 9(B), a magnetic circuit configuration for performing bistable operation will be described. In this configuration, the magnetic attraction force acting on the armature 50 is applied to the permanent magnet 20. Determined by When the armature 50 is attracted to the second magnetic plate 212' or the third magnetic plate 2131 of the yoke 21', the permanent magnet 20 exhibits an antisymmetric characteristic curve that exceeds the repulsive force of the movable contact spring load. held by magnetic attraction. As shown in Figure 9),
When the armature 50 is attracted and held by the second magnetic plate 212' of the yoke 21', when the pulse current 110 is applied to the excitation winding 35, the permanent magnet 20 - the third magnetic plate 213' - the third magnetic plate 212' The main magnetic flux Φ10 passing through the magnetic plate 211' of Φ 1, the magnetic bar 30, the armature 50, the second magnetic plate 212', and the permanent magnet 20 decreases, and the armature 50 (J shown in Fig. 9 (11) Like the third
It is switched and attracted to the magnetic plate 213'. In the state shown in FIG. 9(B), the armature 50 is composed of the permanent magnet 20 - the third magnetic plate 2131 - the armature 50 - the magnetic bar 30 - the first magnetic plate 21
11-Second magnetic plate 212+-Attracted and held by the third magnetic plate 2131 by the main magnetic flux Φ20 passing through the permanent magnet 20. At this time, when a pulse current of -110 is applied to the excitation winding 35, the magnetic flux Φ20 decreases and the armature 50 returns to the second position.
is switched and attracted to the magnetic plate 212'. Since the contact spring driving body 51 drives the movable contact spring 40 according to the rotation of the armature 50, the movable contact member 401a of the spring 40 and the fixed contact member 411 of the fixed contact spring 41, and the movable contact member 401b and the fixed contact The members 421 selectively contact each other.

In the monostable and bistable magnetic circuit configurations of the polarized electromagnetic relay of the present invention described above, the magnetic flux Φ2° Φ10. Φ20 depends on the energy product and cross-sectional area of the permanent magnet 20, and the magnitude of the magnetic attraction force is proportional to each of these magnetic fluxes.
If we increase the cross-sectional area by 9η in the longitudinal direction of the magnetic plate, then
The contact force can be easily increased. Further, the polarized space formed by the second and third magnetic plates of the yoke 21° 21' is located between the magnetic bar erected position forming the rotation support shaft of the armature 50 and each contact spring erected position. Exists in places,
Since the travel amount χ of the armature 50 can be set large by the lever ratio of the armature 50 and the contact spring driver 51,
Contact gap can be easily increased. Therefore, a magnetic relay can be configured with a pole having a large contact switching capacity.

[Effect of origin] As explained above, according to the present invention, the winding piece assembly and the permanent magnet assembly constituting the electromagnetic drive means are arranged in parallel with each other on the insulating base together with the contact spring body. The paid electromagnetic relay can be made into a slim shape that does not occupy the mounting area. Furthermore, by fitting the relay components into the insulating base and assembling them, it is possible to improve productivity and, in particular, to reduce costs through automatic assembly. Furthermore, according to the present invention, monostable and bistable operating type polarized electromagnetic relays can be constructed without significantly changing the shape and arrangement of the relay components. Further, according to the present invention, it is possible to easily increase the contact gap and contact force to increase the contact opening/closing capacity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a polarized electromagnetic relay according to the present invention, FIG. 2 is a perspective view showing an example of the structure of an insulating base in the same embodiment, partially cut away, and FIG. 3 is a perspective view showing an embodiment of the polarized electromagnetic relay according to the present invention. FIG. 4 is an exploded perspective view showing one configuration example of the permanent magnet assembly and winding assembly in the example; FIG. 4 is a partially cutaway perspective view showing another configuration example of the permanent magnet assembly in the same example; FIG. The figure is an exploded perspective view showing a contact spring body and an insulating base in the same embodiment, FIG. 6 is an exploded perspective view showing a configuration example of an armature assembly in the same embodiment, and FIG. 7 is a casing in the same embodiment. FIG. 8 (Al and FIG. 8) is a perspective view showing an example of the configuration of a monostable magnetic circuit in the same embodiment, and FIG. 9) is a perspective view showing a configuration example of a bistable magnetic circuit in the same embodiment. 1...Insulating base, 10...Base, 11
...Insulating wall・111,112,113・・・・
...First. Second. Third wall % 12, 12a, 121
)+12C-...=Spring holding groove, 15...Protrusion base・
16.18...Protrusion, 2...Permanent magnet assembly, 20...Permanent magnet, 21.21'...
...Yoke, 211.2121213.211', 212
', 213'・River... 1st ° 2nd. third magnetic plate, 3.
. . . Winding assembly, 31 . . . Winding frame, 32.
33... flange, 34... old winding shaft, 4...
... Contact spring body, 40 ... Movable contact spring, 41° 42 ... Fixed contact spring, 5 ... Armature assembly, 5° ... Armature , 51...Contact spring drive body, 52...Tighten 6°° on each side -
601, 602... Protrusions. s3 figure 1

Claims (4)

[Claims] (1) A first wall erected at approximately the middle of the extending base so as to cut off both ends in the longitudinal direction of the base; an insulating base having second and third walls erected in a U-shape and a protrusion provided on the first wall; flatly disposed on the base and having one end; a first magnetic plate sandwiched between the base and the abutment; a first magnetic plate sandwiched between the protrusion provided on the first wall and the second wall; a second magnetic plate erected along the third wall, and a second magnetic plate sandwiched between the protrusion provided on the first wall and the third wall and erected along the third wall; a yoke consisting of a third magnetic plate; and a yoke placed on the protrusion of the first wall with a magnetic pole part in contact with the second and third magnetic plates of the yoke. a permanent magnet assembly having a permanent magnet; a magnetic bar erected at the other end of the first magnetic plate of the yoke; a hollow winding shaft around which an excitation winding is wound is fitted onto the magnetic bar; a winding assembly comprising a winding frame equipped with a wire; a contact spring body erected on one end of the base and comprising at least one movable contact spring and at least two fixed contact springs; an armature whose other end is fitted to the magnetic rod of the winding assembly so as to selectively rotationally contact the second and third magnetic plates of the yoke; an armature assembly comprising a contact spring driver whose free end extending beyond one end is engaged with the movable contact spring; the insulating base, the permanent magnet assembly, the winding assembly;
A polarized electromagnetic relay comprising: a casing that accommodates the contact spring body and the armature assembly. (2) One of the second and third magnetic plates -1 of the permanent magnet assembly is integrally coupled to the one end of the first magnetic plate, and the other is integrally coupled to the one end of the first magnetic plate. A polarized electromagnetic relay according to claim 1, characterized in that a monostable magnetic circuit is configured by being spaced apart from the polarized electromagnetic relay. (3) The second and third magnetic plates are integrally connected to the one end of the first magnetic plate of the permanent magnet assembly, and the second and third magnetic plates are integrally connected to the one end of the first magnetic plate, and The polarized electromagnetic relay according to claim 1, characterized in that a bistable magnetic circuit is constructed by providing a notch for preventing magnetic short circuits. (4) The second magnetic plate erected along the second wall and the third magnetic plate erected along the third wall on opposing inner walls of the casing. 2. The polarized electromagnetic relay according to claim 1, further comprising a pair of protrusions for holding the ridges.