JP3161769B2 - relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay for remote control.

[0002]

2. Description of the Related Art A conventional relay of this type is shown in FIG.
A main contact block B and an auxiliary contact block C are provided on both sides of the base 11, and a yoke 27 'and an iron core 2 are provided in the center.
9 ', a coil block A including a coil frame 31 around which a coil 32 is wound is provided. A movable block D including a movable frame 36, an amateur 37, and a permanent magnet 38 is rotatably disposed on the coil block A.
Note that a cover 46 is provided on the base 11.

[0003] Here, a rotating shaft 35 is protruded from a flange portion 33 of the coil frame 31, and a shaft hole 40 supported by the rotating shaft 35 is formed at an end of the movable frame 36. Movable frame 36
By inserting the rotating shaft 35 of the coil frame 31 into the shaft hole 40, the movable frame 36 becomes rotatable about the rotating shaft 35 as an axis.

[0004]

FIG. 15 is an explanatory diagram showing the relationship of the suction force between the iron core 29 'and the amateur 37 in the above configuration. The magnetic pole pieces 28 formed at the ends of the conventional yoke 27 'are formed to face each other with the same size, so that the attractive force is balanced, not unbalanced. The main contact block B
The leaf spring 14 is driven by the movable frame 36.

The armature 37 is disposed on the movable frame 36, and the armature 37 is attracted to the magnetic pole surface 30 of the iron core 29 'and the magnetic pole piece 28 of the yoke 27', so that the movable frame 36
Drives the leaf spring 14 to open and close the contact. Here, the arrangement of the armature 37, the iron core 29 ', and the yoke 27' with the pole piece 28 is configured as shown in FIG.
And the armature 37 are opposed to each other, and the iron core 29 'and the pole piece 28 are also opposed to each other. As shown in FIG. 15, the upper side has the center of the attractive force between the iron core 29 'and the amateur 37 (line B in the figure), and the lower side has the attractive force between the magnetic pole piece 28 of the yoke 27' and the amateur 37. There is a center (C line in the figure).

Accordingly, the center of the attractive force of the entire electromagnet (line a in the figure) exists at the center. The point at which the plate spring 14 is driven on a line between the center of the attractive force of the entire electromagnet and the axis of the movable frame 36 (the shaft support portion between the shaft hole 40 and the rotating shaft 35) is a spring driving point P. In such a case, that is, when the attraction force is not unbalanced, since the center position of the electromagnet is almost near the center of the amateur 37, the spring driving point P is determined from the balance of the load for horizontally driving the movable frame 36.
Is at the top.

FIG. 16 shows a case in which the suction force is unbalanced to facilitate the unbalanced spring load and alignment of the main contact block and the auxiliary contact block. In order to unbalance the suction force, the yoke 27 'is used. Is shortened to a short piece 28a. When the short piece 28a is formed in this manner, there is a problem that the center position of the electromagnet (the line A in the figure moves downward, and the spring driving point P moves downward accordingly.

When the spring driving point P moves downward, there is a problem that stable operation cannot be obtained. The present invention has been made in view of the above points, and facilitates unbalanced spring load and alignment of a main contact block and an auxiliary contact block, and achieves stable operation by raising a spring driving point upward. It is intended to provide a relay for the purpose.

[0009]

According to the present invention, there is provided an armature which is attracted to a magnetic pole surface of an iron core on which a coil is wound by excitation and reverse excitation of the coil, and a yoke to which one end of the iron core is connected. An armature is attracted to the pole piece formed opposite to the end and the pole face of the iron core, and in a relay for opening and closing the contacts of the main contact block and the auxiliary contact block, one of a pair of pole pieces formed opposite to the other end of the yoke is connected. The short piece is shorter than the other piece, and the short piece and the armature have an opposing surface, and the short piece and the iron core are not opposed.

[0010]

The suction force is imbalanced by the short piece to facilitate the unbalanced spring load and alignment of the main contact block and the auxiliary contact block, and the short piece and the iron core are not opposed to each other, so that the gap between the iron core and the amateur can be reduced. By raising the central position of the attractive force acting on the magnet, the central position of the attractive force of the entire electromagnet can be moved upward, and the spring drive point can be raised upward to obtain a stable operation.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.
I do. First, before explaining the remote control relay itself,
Monitoring control by time division multiplex transmission using mocon relay
A schematic configuration of a remote monitoring control device that performs control will be described. Figure
10 is a remote monitoring system using the remote control relay according to the present invention.
This shows the schematic configuration of the control system.
And the unique address is set and the switch S₁~ S _FourMonitor
Monitoring terminals 2, load L₁~ L_FourControl
Control terminal 3, wireless relay terminal 7, external
Interface terminal 8 and selector switch terminal 9
Are connected by a pair of signal lines 4.

As shown in FIG. 11A, the transmission signal Vs transmitted from the central controller 1 to the signal line 4 includes a start pulse signal ST indicating the start of signal transmission, a mode data signal MD indicating a signal mode, and a terminal. vessels 2, 3, address data signal AD for transmitting 8-bit address data for calling the 7-9, the control data signal CD for transmitting the control data for controlling the load L ₁ ~L _4, check sum data signal CS
And a multi-pole (± 24 V) time-division multiplexed signal composed of a return standby signal WT for setting a return period from the terminals 2, 3, 7 to 9, and data is transmitted by pulse width modulation. I have.

In each of the terminals 2, 3, 7 to 9, when the address data of the transmission signal Vs received via the signal line 4 matches its own address data, the transmission signal Vs
In addition to taking in the control data of s, the monitor data signal is returned as a current mode signal (a signal transmitted by short-circuiting the signal lines 4 through an appropriate low impedance) in synchronization with the return signal WT of the transmission signal Vs. It is supposed to.

The central control unit 1 includes a dummy signal transmitting means for constantly transmitting a dummy transmission signal in which the mode data signal MD is set to the dummy mode, one of the monitoring terminal 2 or the wireless relay terminal 7, When an interrupt signal Vi as shown in FIG. 11 (b) returned from the interface terminal 8 and the selector switch terminal 9 is received, the interrupt generating terminals 2, 7 to 9 are detected and the terminal 2, Interrupt processing means for accessing 7 to 9 and returning monitoring data is provided.

In the central controller 1, as described above,
Monitoring terminal 2 or wireless relay terminal 7,
External interface terminal 8, selector switch terminal
Based on the monitoring data returned to the central controller 1 from the
Corresponding load L₁~ L_FourControl terminal 3 for controlling
Create control data to be transmitted, and
Time-division multiplexing to the control terminal 3 via the signal line 4
Transmit and load L₁~ L _FourIs controlled.

The wireless relay terminal 7 is a terminal for relaying data of an optical wireless system comprising an optical wireless transmitter X, an optical wireless receiver Y and a wireless signal line 4a. The received optical signal is received by the optical wireless receiver Y, the received data is received via the wireless signal line 4a, and this data is transferred to the central control device 1.

The external interface terminal 8 is
The selector switch terminal 9 is a terminal that performs data transmission with the external control device 8a, and the selector switch terminal 9 is a terminal that centrally controls a large number of loads. The monitoring terminal 2 and the control terminal 3 disposed in the distribution board 6 or the relay control panel 6a have a distribution board agreement size, and the control output thereof is used to control the remote control relay for load control. (Latching relay that can be turned on and off also by a hand switch) 5 is controlled.

Next, a remote control relay used for the control terminal 3 will be described. FIG. 12 is an exploded perspective view of the control terminal 3, and FIG. 13 is a block diagram.
Here, remote control relay is represented by Ry ₁ to Ry _4. The transmission module 59 includes a signal processing circuit including a microcomputer, an address setting unit 58 formed of an EEPROM, a photodiode PD, a light emitting diode LD, and the like.

Further, as shown in FIG.
4 sets of outputs are set winding S and reset respectively.
Remote control which is a two-winding latching relay having a winding R
Relay Ry₁~ Ry_FourIs connected. Each relay Ry₁
~ Ry_FourHas the main contact R₁~ R _FourAnd auxiliary contact r₁~ R_FourTo
With main contact R₁... A load is connected between the auxiliary contacts
r₁... are the signal processing of the transmission module 59
Input to the circuit and returned to the central control unit as a monitoring signal
It is supposed to be.

Normally, an arbitrary relay Ry ₁ ... Is driven on the basis of control data transmitted from the central control device to control on / off of a load connected to the main contacts R _1. However, in the present embodiment, the relay Ry ₁ ...
Are directly and collectively turned on or off, and switches SW ₁ and SW ₂ for turning on or off the load are provided. The switch SW ₁ is a switch for turning on the relays Ry ₁ ... Collectively, and the switch SW ₂ is a relay Ry
_This is a switch for turning off ₁ ... all together.

The transmission signal Vs transmitted via the signal line 4 is input to the signal processing circuit of the transmission module 59, and the unique address data set in the address setting unit 58 and the received transmission signal Vs is determined to match the address data, and control data (in the embodiment, dimming control data) transmitted at the time of the address match is taken in, and relays Ry ₁ ... Corresponding to the specified load are taken.
Control.

The relays Ry ₁ ... Energize the reset winding R or the set winding S of the relay Ry ₁ by a signal output from the transmission module 59, and the main contact R
Turn ₁ off or on. By this main contact R ₁ of the on-off is turned on or off control of the load. State of the load, the contact output of the auxiliary contact r ₁ relay Ry ₁ is input to the transmission module 59, is created as a monitoring signal indicating the operating state of the load. So that the the return signal V _B to be returned to the central control unit 1 is sent to the signal line 4 as returned by the monitoring data the current mode signal (inserting a resistor R of low resistance value between the signal line 4) .

On the other hand, the EE constituting the address setting unit 58
Writing of data to the PROM is performed by the transmission module 59.
Is performed by the signal processing circuit. FIG.
As shown in FIG. 2, the terminal device case 60 is formed to have two module sizes of the distribution board agreement size, and the terminal device case 60 is composed of the body 60a and the cover 60b. It is assembled and connected by a fixing screw 73.

The printed circuit board block 61 is composed of upper and lower printed circuit boards 61a and 61b. The upper printed circuit board 61a has a signal processing circuit comprising a microcomputer and an address setting section 58 comprising an EEPROM.
And a photodiode P for transmitting and receiving an optical wireless signal
D and a light emitting diode LD, a light emitting diode LDc for confirming reception, and switches SW ₁ and SW ₂ for collective control are mounted. Further, the relay Ry ₁ to Ry ₄ is mounted on the lower side of the printed circuit board 61b.

The upper printed circuit board 61a is disposed on the back surface of the cover 60b with screws 72, and an opening 62a corresponding to the light emitting diode LD and the photodiode PD is provided on the front surface of the terminal case 60, that is, on one end of the cover 60b.
And an opening 62 corresponding to the confirmation light emitting diode LDc.
b are provided, and a filter 63 for cutting unnecessary infrared rays is provided in the opening 62a for transmitting and receiving the optical wireless signal.

The light emitting diode LDc is connected to the opening 62.
The transparent nameplate 70 is attached to the concave portion 67 of the cover 60b provided with the opening 62b and the filter 63. The nameplate 70 has switches SW ₁ and SW
A cutout 70a for exposing the _second operation unit is formed.
In the case of a non-transparent nameplate, the opening 62b and the filter 63 may be cut out.

At one end of the cover 60b, four sets of connection terminals 74 for outputting contact outputs of the main contacts R ₁ ... Provided with a lead wire 75 are provided, and these connection terminals 74 are screwed with screws 78. It is covered with the terminal cover 79 attached. Also,
A signal terminal 7 to which a signal line is connected is provided at the other end of the cover 60b.
7 are provided. Each terminal 74, 77 is composed of a terminal plate and a terminal screw.

[0028] Incidentally, in the circuit of FIG. 13, the terminal T ₁ ~
T ₈ corresponds to the connection terminal 74, and the signal terminal 77
₉ and T ₁₀ correspond to each other. On the other hand, the terminal case 60
The body 60a is provided with a mounting groove 66 in which a connecting plate or a DIN rail mounting adapter is mounted. Next, a remote control relay which is the gist of the present invention will be described. This remote control relay corresponds to the above-mentioned remote control relays Ry ₁ . Also, the main contact R ₁
.. Correspond to the main contact block B, and the auxiliary contacts r ₁ .

FIG. 4 is an exploded perspective view of the whole, FIG. 5 is a perspective view, and FIG. 6 is a plan view. A coil block A is disposed at the center of the upper surface of a base 11 made of an insulating material, a main contact block B is disposed outside a partition wall 12 integrally protruding from the base 11, and an auxiliary contact is provided on the other insulating wall 12a. Block C is provided. Conductive terminal plate 1
A base of a conductive leaf spring 14 is fixed to the upper end of the base 3.
The terminal plate 13 is arranged on the base 11 through a hole 11 a formed in the base 11. Leaf spring 14
The movable contact 15 is fixed to one surface of the tip of the substrate, and the conductor plate 16 is fixed to the other surface. And these movable contacts 15,
The leaf spring 14 and the conductor plate 16 are fixed to three layers. That is, the leaf spring 14 and the conductor plate 16 are simultaneously caulked and fixed by the movable contact 15.

An iron piece 17 is fixed to a lower portion of the conductor plate 16. A flexible braided conductive wire 18 is connected between the lower portion of the conductor plate 16 and the central portion of the terminal plate 13 in parallel with the leaf spring 14 by spot welding. A fixed contact 20 facing the movable contact 15 is fixed to the upper end of the conductive terminal plate 19 provided in the hole 11b of the base 11, and a substantially U-shaped iron piece 21 is provided at the center. ing.

The auxiliary contact block C disposed on the side opposite to the main contact block B is configured as follows. That is, the base of a leaf spring 25 having a movable contact 26 fixed to the distal end thereof opposed to the fixed contact 23 fixed to the upper end of the auxiliary terminal plate 22 is inserted into the hole 11c of the insulating wall 12a. The auxiliary terminal plate 22 is also inserted and arranged in the hole of the insulating wall 12a.

Next, the coil block A disposed between the partition wall 12 at the center of the upper surface of the base 11 and the insulating wall 12a between the main contact block B and the auxiliary contact block C will be described. A rectangular hole 27a is bored in one piece of the yoke 27 bent into an L shape, and the pole pieces 28,
28a are erected opposite each other. Here, one of the pole pieces is a shortened short piece 28a.

A substantially L-shaped iron core 29 is inserted through the inside of the coil frame 31, and a protruding portion 29 a at the tip is formed into a hole 27 a of the yoke 27.
And the core 29 is fixed to the yoke 27 by caulking or the like.
Fixed to The end of the iron core 29 protrudes from the coil frame 31, and both side surfaces are magnetic pole surfaces 30. A coil 32 is wound around the outer peripheral surface of the coil frame 31, and three coil terminals 34 connected to terminals of the coil 32 are embedded in one thick flange portion 33 of the coil frame 31. Bottom of the coil terminals 34 are respectively inserted into the hole 11 ₁ of the base 11. A protrusion 33a is formed on the upper surface of the flange portion 33 of the coil frame 31, and a rotation shaft 35 is formed on the protrusion 33a.

The movable block D disposed above the coil block A includes a movable frame 36 and two amateurs 37 (3
7a, 37b) and a permanent magnet 38. A shaft hole 40 is formed at one end of the movable frame 36 made of an insulator. The rotating shaft 3 of the coil frame 31 is
5, the movable frame 36 is rotatable. On the lower surface of the other end of the movable frame 36, two armatures 37 sandwiching a permanent magnet 38 are arranged, and an arm 41 for driving the leaf spring 14 is formed from one side of the movable frame 36.

As shown in FIGS. 1 and 2, the amateur 3
The pole piece 7a and the pole piece 28 of the yoke 27 are substantially opposed to each other, but the armature 37b and the short piece 28a are partially opposed at the lower portion in order to achieve an unbalanced suction force. The magnetic pole surface 30 of the iron core 29 and the yoke 27
However, the iron core 29 and the short piece 28a are not opposed to each other in order to move the central position of the attractive force of the entire electromagnet upward.

The arm 41 constituting the card has a slit 44 formed in the lower surface opening, and the leaf spring 14 is disposed in the slit 44. The slit 44 is open at the lower surface and side, so that the leaf spring 14 can be easily arranged in the slit 44. A projection 45 is integrally provided on the opposite side of the arm 41, and the projection 45 is
The leaf spring 25 of the auxiliary contact block C is arranged in a slit formed on the lower surface of the plate to drive the leaf spring 25.

The base 11 on which the above members are provided is covered with a box-shaped cover 46 made of an insulating material having a lower surface opening. When the movable block D is provided on the coil block A, Is a main contact block B as shown in FIG.
The leaf spring 14 of the auxiliary contact block C is placed in the slit 44 of the movable frame 36, and the leaf spring 25 of the auxiliary contact block C is placed in the slit of the projection 45. Further, both armatures 37 are located between a pair of gaps formed between the pole face 30 of the iron core 29 and the pole piece 28. Thus, the movable block D is disposed above the coil block A to form a polarized electromagnet block.

Then, the inner surface of the armature 37 is alternately turned on the magnetic pole surface 30 of the iron core 29 by exciting and reverse exciting the coil 32.
And the magnetic pole piece 28 of the yoke 27 attracts the movable frame 36
To rotate the main contact block B and the auxiliary contact block C
To drive. Incidentally, the remote control relay is a latching relay, and the coil 32 has two windings. The coil 32 is connected to the coil terminal 34 as described above, but as shown in FIGS.
4 is a common terminal 34c, one set terminal 34a for turning on the main contact and a reset terminal 34b for turning off the main contact.
It is.

FIGS. 1A and 6 show a non-excited state, in which one of the armatures 37b is connected to the pole face 30 of the iron core 29. FIG.
The permanent magnet 3 is attached to the pole piece 28 of the other amateur 37a.
The magnetic flux of No. 8 attracts each, and both contacts 15 and 20 of the main contact block B are open. Further, since the movable frame 36 is biased in the counterclockwise direction, the leaf spring 25 of the auxiliary contact block C is elastically contacted with the slit of the projection 45 of the movable frame 36 to bring both contacts 23 and 26 into an open state. I have.

The set terminal 34a and the common terminal 34
When a voltage is applied to the coil c, the coil 32 is excited and
As shown in (b), one of the amateurs 37a has a core 2
9 and the other armature 37b is attracted to the short piece 28a, respectively, and the movable frame 36 is rotated clockwise about the rotation shaft 35 to be turned on. That is,
When the movable frame 36 rotates clockwise, the arm portion 41 urges the leaf spring 14 of the main contact block B, and the two contact points 15,
20 is closed, and the leaf spring 2 is
5, the contacts 23 and 26 are closed. When a voltage is applied to the reset terminal 34b and the common terminal 34c in this ON state, the state returns to the state shown in FIG.

Here, as described above, since the magnetic pole piece 28 and the short piece 28a are formed on the yoke 27, the attractive force characteristics can be unbalanced as shown in FIG.
It is possible to easily match the main contact block B and the auxiliary contact block C with the unbalanced spring load as in the present embodiment. The magnetic pole surface 30 of the iron core 29 and one magnetic pole piece 28 of the yoke 27 are opposed to each other, and the iron core 29 and the short piece 28a are not opposed to each other, as shown in FIG.
Move the center of suction force between 9 and amateur 37 to the upper part,
The central position of the attractive force of the entire electromagnet can be set to the same position as when the unbalance is not imbalanced.

That is, by raising the central position of the attractive force acting between the iron core 29 and the armature 37 upward, the central position of the attractive force of the entire electromagnet can be moved upward, and the spring drive point can be pulled upward. Action can be obtained. Here, since the braided conductive wire 18 is connected to the main contact block B of the main contact in parallel with the leaf spring 14, when a large current such as a short-circuit current flows, the current is connected to the leaf spring 14 by the braid. Since the heat is diverted to the conducting wire 18 to prevent fusing of the leaf spring 14 and also reduce heat generation of the leaf spring 14, melting of the arm 41, which is a spring driving part of the movable frame 36, is also prevented.

When a short-circuit current flows, the conductor plate 16
Attraction force is generated by the iron pieces 17 and 21 provided on the terminal plate 19 to prevent electromagnetic repulsion of the contacts. still,
In order to increase the current withstand capability of the leaf spring 14, it is sufficient to increase the cross-sectional area of the leaf spring 14 itself. However, in this case, the spring load becomes large, and it is difficult to match the movable block D with the attraction force of the electromagnet. turn into.

However, in this embodiment, since only the leaf spring 14 having a small sectional area is pushed, the spring load can be made similar to that of the conventional relay. Further, in the present embodiment, the braided conductor 18 is attached to the conductor plate 16, but the braided conductor 18 may be directly connected to the back surface of the movable contact 15 or the like. In the embodiment of the present invention, the main contact is a flexure and the auxiliary contact is a lift-off type. However, the present invention is not limited to this. On the auxiliary contact side, the contacts 23 and 26 are plated with gold or the like in order to improve reliability.

FIGS. 7 to 9 show an embodiment in which two sets of main contact blocks B are provided to form a so-called double-cut type.
That is, the partition walls 12 are formed on both sides of the base 11, respectively.
A main contact block B having the same configuration as that of the previous embodiment is disposed outside the partition wall 12, and an auxiliary contact block C is disposed outside one main contact block B. In this embodiment, the leaf spring 2 of the auxiliary contact block C is used.
5 is fixedly arranged on the upper part of the auxiliary terminal plate 24 fixed to the base 11.

The protruding base 33 of the flange 33 of the coil frame 31
a, a substantially semicircular recess 48 is formed.
At the center of 8, a rotating shaft 35 is protruded. In addition, movable frame 3
A boss 49 that fits into the recess 48 protrudes from one end of the shaft 6, and a shaft hole 4 into which the rotary shaft 35 is inserted.
0 is drilled. In addition, since the main contact blocks B are provided on both sides, the arm portions 41 and 50 are formed on both sides of the movable frame 36 in the present embodiment, and the protrusions 42 formed on the both arm portions 41 and 50, respectively. The leaf springs 14 of both main contact blocks B are arranged in the slits 44 between the 43. Further, the arm 50
A projection 51 for urging the leaf spring 25 of the auxiliary contact block C protrudes from the tip of the auxiliary contact block C.

[0047]

According to the present invention, as described above, the coil excitation,
An armature is attracted to the magnetic pole surface of the iron core on which the coil is wound by the reverse excitation, and a yoke is connected to one end of the iron core. The armature is attracted to the magnetic pole piece formed opposite the other end of the yoke and the magnetic pole surface of the iron core. In a relay that opens and closes the contacts of the main contact block and the auxiliary contact block, one of a pair of magnetic pole pieces formed to face the other end of the yoke is a short piece shorter than the other, and the short piece and the amateur have opposing surfaces. At the same time, since the short piece and the iron core are not opposed to each other, the suction force is imbalanced by the short piece to facilitate alignment with the unbalanced spring load of the main contact block and the auxiliary contact block. By raising the center of the attractive force acting between the iron core and the amateur upward, the central position of the attractive force of the entire electromagnet is moved upward, and the spring drive Pull up cement at the top in which is provided an advantage of being able to obtain a stable operation.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are cross-sectional views of main parts during operation of an embodiment of the present invention.

FIG. 2 is a perspective view of a yoke and an iron core according to the first embodiment.

FIG. 3 is an explanatory diagram showing a suction force characteristic of the above.

FIG. 4 is an exploded perspective view of the whole relay.

FIG. 5 is a perspective view of the entire relay.

FIG. 6 is a plan view of the relay.

FIG. 7 is an exploded perspective view of another embodiment of the above.

FIG. 8 is an overall perspective view of the relay.

FIG. 9 is a plan view of the relay.

FIG. 10 is a schematic system diagram of a remote control system using the relay.

FIG. 11 is an operation explanatory diagram of FIG. 10;

FIG. 12 is an exploded perspective view of the control terminal.

FIG. 13 is a block circuit diagram of a control terminal.

FIG. 14 is an exploded perspective view of a conventional relay.

FIG. 15 is an explanatory diagram of a conventional example.

FIG. 16 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 27 yoke 28 pole piece 28a short piece 29 iron core 30 pole face 32 coil 37 amateur

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-114424 (JP, A) JP-A-61-39331 (JP, A) Jpn. Field (Int.Cl. ⁷ , DB name) H01H 51/22 H01H 50/36

Claims (1)

(57) [Claims] 1. An armature that is attracted to a magnetic pole surface of an iron core on which a coil is wound by excitation and reverse excitation of a coil, and a yoke to which one end of the iron core is connected, and a magnetic pole piece formed opposite to the other end of the yoke. An amateur is attracted to the magnetic pole face of the iron core,
In a relay that opens and closes the contacts of the main contact block and the auxiliary contact block, one of a pair of magnetic pole pieces formed to face the other end of the yoke is a short piece shorter than the other, and the short piece and the armature have facing surfaces. And the short piece and the iron core are not opposed to each other.