KR101789224B1

KR101789224B1 - Thermal overload relay

Info

Publication number: KR101789224B1
Application number: KR1020157008644A
Authority: KR
Inventors: 유키나리 후루하타; 타케오 카모사키; 켄 후지타
Original assignee: 후지 덴키 기기세이교 가부시끼가이샤
Priority date: 2012-11-22
Filing date: 2013-09-30
Publication date: 2017-10-23
Also published as: CN104704599B; KR20150053946A; JP6255664B2; CN104704599A; WO2014080558A1; JP2014107023A

Abstract

The present invention provides a thermal overload relay capable of preventing a reset bar from being pushed down by an external factor other than a reset operation. A main bimetal for detecting and displacing an overload and a release lever for moving to a displacement of a shifter interlocking with the main bimetal are provided in the casing 2, A contact reversing mechanism for performing a reversal operation in accordance with the rotation of the release lever to switch the contact point and an operation section for operating the release lever and the contact reversal mechanism are disposed, And a reset bar (43) for returning the contact reversing mechanism to the initial state by projecting the reset bar (43) from the inside of the casing to the outside, characterized in that an external factor other than a reset operation for the reset bar Fitting protrusion 7 for restricting the press-fitting operation by the protrusion 7 is disposed.

Description

Thermal Overload Relay {THERMAL OVERLOAD RELAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal-type overload relay for switching a contact when an overcurrent is detected, and more particularly to an improvement of an operation portion for returning from a trip state to a return state.

BACKGROUND ART As a thermal overload relay that detects and operates an overload current flowing in a main circuit, for example, an apparatus disclosed in Patent Document 1 is known.

In the thermal overload relay described in Patent Document 1, the electromagnetic contactor is connected to the back side. A reset bar for returning from the tripped state to the returning state by pushing in the vicinity of the right end of the upper surface of the thermal overload relay and near the back surface is protruded and disposed.

Japanese Patent Application Laid-Open No. 2010-232057

In the conventional example described in the above-mentioned Patent Document 1, a reset bar for returning from a tripped state to a return state is projected and disposed by pushing the contactor on the back side connecting the electromagnetic contactor on the upper surface of the thermal overload relay. Therefore, when the wiring is connected to the external connection terminal on the side of the thermal overload relay formed on the electromagnetic contactor, the wiring comes into contact with the reset bar depending on the rounting state of the wiring, There is an uncertain problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned unsolved problem of the conventional example, and it is an object of the present invention to provide a thermal overload relay capable of preventing the reset bar from being pushed in due to external factors other than the reset operation.

In order to solve the above problems, a first aspect of the thermal overload relay according to the present invention is a relay including a main bimetal for detecting and displacing an overload in a casing, a shifter for interlocking with the main bimetal, A contact reversing mechanism for performing a reversal operation in response to the rotation of the release lever to switch contacts and an operation section for operating the release lever and the contact reversing mechanism, And the operating portion is a thermal overload relay installed by projecting a reset bar for returning the contact reversing mechanism to the initial state by pushing operation from the inside of the casing. In addition, a press fitting regulating protrusion (protrusion) for regulating the press fitting operation due to an external factor other than the reset operation to the reset bar is disposed in the vicinity of the reset bar.

In the second aspect of the thermal overload relay according to the present invention, the press fitting regulatory projection is formed on the back side of the reset bar to which the external connecting device is connected.

The third aspect of the thermal overload relay according to the present invention is characterized in that the casing has an opening / closing cover for covering the operating portion, and the press-fitting regulating protrusion is formed around the through-hole for inserting the reset bar into the opening / Respectively.

The fourth aspect of the thermal overload relay according to the present invention is characterized in that the reset bar is switchable between a press-fit manual reset position and an automatic reset position held in a press-fit state by an operation of depressing the manual reset position And the manual reset position is held by engaging the engaging concave portion formed in the reset bar and the engaging convex portion formed in the through hole of the opening / closing cover.

The fifth aspect of the thermal overload relay according to the present invention is characterized in that the casing includes a case for housing the main bimetal, the release lever, the contact reversal mechanism and the operating portion, And a cover provided with a connection line passing portion which is detachably mounted on the case so as to be capable of closing the connection line and which is configured to project a plurality of connection lines connected to the external connection device outwardly, Respectively.

In the sixth aspect of the thermal overload relay according to the present invention, the press fitting regulatory projection is formed to prevent press-fitting of the reset bar due to contact of wiring connected to the external connecting device.

According to the present invention, since the press-fit regulating projection for regulating the press-fitting operation due to an external factor other than the reset operation to the reset bar is disposed in the vicinity of the reset bar protruding from the casing, the reset bar is pushed It is possible to prevent the occurrence of malfunctions.

1 is an external perspective view showing a state in which an electromagnetic contactor is connected to a thermal overload relay according to a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view of the main part of the thermal overload relay of FIG. 1; FIG.
3 is a perspective view showing a state where the open / close cover of the thermal overload relay of FIG. 1 is opened.
4 is a perspective view showing an open / close cover of the thermal overload relay.
5 is a sectional view taken on line A-A of Fig. 3 with the open / close cover removed.
Fig. 6 is a diagram showing the contact reversing mechanism. Fig. 6 (a) is a diagram showing an initial state, and Fig. 6 (b) is a diagram showing a trip state.
7 is a plan view showing a state where wirings are connected to the electromagnetic contactor of Fig.
Fig. 8 is a side view of Fig. 7. Fig.
Fig. 9 is an external perspective view similar to Fig. 1 showing a second embodiment of the present invention.
10 is an enlarged plan view showing a main part of the second embodiment.
11 is a perspective view of the thermal overload relay according to the second embodiment as viewed from the rear side.
Fig. 12 is a perspective view showing the thermal overload relay and the removed cover in the second embodiment. Fig.
13 is a perspective view showing an opening / closing cover in the second embodiment.

Hereinafter, a first embodiment of the thermal overload relay according to the present invention will be described with reference to the drawings.

1 is an external perspective view showing a state in which an electromagnetic contactor is connected to a thermal overload relay according to the present invention.

In the figure, reference numeral 1 denotes a thermal overload relay, and the electromagnetic contactor 50 is connected to the rear side of the thermal overload relay 1. [

As shown in Figs. 2 and 3, the thermal overload relay 1 has an insulating casing 2, and is connected to the upper surface of the casing 2 by a hinge portion 3 at a left end portion Closing cover 4 that can be opened and closed is provided.

3, an adjustment section 9a of the adjustment dial 9, a reset bar 43 for resetting a contact inversion mechanism to be described later, and an operation display / And an operation section 45 composed of a manual trip operation window (window) 44 are provided.

4, a through-hole 5 for inserting the reset bar 43 therethrough is formed in the opening-closing cover 4, and a through-hole 5 is formed in the left-hand side of the through- A locking engagement convex portion 6 for locking the rotation is formed.

The opening and closing cover 4 is provided with a through hole 5 for regulating the press-in operation due to an external factor other than the reset operation of the reset bar 43 on the side edge opposite to the electromagnetic contactor 50 Fitting regulating projection 7 is integrally formed. 2, the press-fitting restricting projection 7 is formed of a plate-like protruding piece 8 along the rear side edge portion and the right side edge portion of the through-hole 5, respectively. The protruding height of the protruding piece 8 is a case where the reset bar 43 is pushed to the reset position in a state in which the opening and closing cover 4 is closed and the reset bar 43 is protruded from the through hole 5 It has been chosen to be at the same height as nothing.

5, an adjustment mechanism 20 which follows the displacement of the shifter 16 engaged with the free end of the main bimetal 15, an adjustment mechanism 20, A contact reversing mechanism 21 is provided for switching the contact point by the action of the contact.

The adjusting mechanism 20 includes an adjusting link 22, an unloading lever 23 rotatably supported by the adjusting link, a temperature compensating unit 23 fixed to the unloading lever 23, And a bimetal (24).

The adjustment link 22 is composed of a link support portion 25 for supporting the release lever 23 and a leg portion 26 extending downward from one side of the link support portion 25. [ A support shaft 27 is provided on the inner wall of the lower side of the casing 2 so as to protrude into the casing 2. [ By inserting the bearing hole 26a of the leg portion 26 into the distal end portion where the diameter of the support shaft 27 is reduced, the entire adjustment link 22 rotates around the support shaft 27 And is supported on the casing 2 so as to be possible.

The releasing lever 23 is rotatably supported on the link supporter 25 by a rotary shaft 23a and the end portion of the temperature compensating bimetal 24 is caulked ).

6, the contact reversing mechanism 21 is provided with a reversing mechanism support portion 32, an interlocking plate 34, a movable plate 35, and a tension coil spring 36 . The reversing mechanism support portion 32 is disposed in the casing 2. [ The interlocking plate 34 is disposed in the vicinity of the reversing mechanism support portion 32 and is rotatably supported by a support shaft 33 provided on the inner wall of the casing 2. The movable plate 35 is arranged such that the upper portion 35b is swingable about a lower portion 35a abutting against the reversing mechanism support portion 32 as a fulcrum. The tension coil spring 36 extends between the upper portion 35b side of the movable plate 35 and the spring support portion 32a of the reversing mechanism support portion 32. [

The interlocking plate 34 is provided with a first interlocking pin 39a for rotating the interlocking plate 34 around the supporting shaft 33 and a second interlocking pin 39b for rotating the interlocking plate 34 around the supporting shaft 33, A pin 39b is provided so as to sandwich the upper end of the movable plate 35 therebetween. The leaf spring 37 on the side of the normally open contact (a contact) is juxtaposed with the free end extending upward. A fixed contact 38a of the a contact 38 is fixed to the free end side of the leaf spring 37. [ A movable contact 38b of the a contact 38 connected to the fixed contact 38a is fixed to the upper portion 35b of the movable plate 35. [

Although not shown, the plate spring on the normally closed contact (b-contact) is disposed in a state in which the free end is extended upward at a position opposite to the a-contact point 38 with the interlocking plate 34 interposed therebetween And a contact support plate is disposed so as to face the plate spring.

2, the reset bar 43 is formed with a cross-shaped groove hole 43a for inserting a tool such as a driver for turning the reset bar 43 on the top surface of the head portion 4 And support pillars 43b to 43e are formed. Out of the support pillars 43b to 43e, an upper end of the support pillars 43e is formed with a latching piece 43f protruding outward.

The locking concave portion (locking concave portion, 43g) which reaches the groove hole 43a on the outer peripheral surface between the support pillars 43b and 43e and engages with the engaging convex portion 6 of the opening / closing cover 4 Is formed. As shown in Fig. 5, on the circumferential surface on the side of the other end of the reset bar 43 (the end on the opposite side to the head portion in the axial direction), a reset piece 43h with a diameter gradually increased toward the head portion is formed ) Is formed in a range of approximately 90 degrees. A convex portion 43i is formed in a neck portion formed between the head portion and the reset piece 43h.

As shown in Fig. 5, the reset bar 43 is disposed in the upper part of the casing 2 so that its axial direction is directed upward and downward. The reset bar 43 is urged upward by a return spring (not shown) formed of a compression spring mounted on the outer periphery of the lower end, and the head portion protrudes from the upper surface of the casing 2. [ The rotation restricting portions 2a and 2b provided in the casing 2 are opposed to the convex portions 43i of the reset bar 43 arranged as shown in Fig. 5 from both sides. The rotation restricting portions 2a and 2b can be prevented from rotating with respect to the convex portions 43i even if the reset bar 43 is rotated so that the substantially entire region of the head portion protrudes from the upper surface of the casing 2 The rotation of the reset bar 43 is regulated.

5, when the reset bar 43 is pushed in such a manner that substantially the entire area of the head portion thereof is located in the casing 2, the reset piece 43h of the reset bar 43 is moved in the direction the movable plate 35 in the tripped state shown in Fig. 6 (b) is returned to the initial position (steady state) as it contacts the plate spring 37 on the contact a side.

A trip operation rod 34a is formed at the upper end of the interlocking plate 34. [ The trip operation rod 34a can be seen through an operation display / manual trip operation window 44 (see FIG. 1) provided on the upper surface of the casing 2 when the interlocking plate 34 is in an initial state. A tool such as a driver inserted from the operation display / manual trip operation window 44 is engaged with the trip operation rod 34a to move the movable plate 35 in the direction of tripping state through the interlocking plate 34 Can be pivoted.

Then, the electromagnetic contactor 50 is connected to the rear side of the thermal overload relay 1. As shown in Fig. 7, the connection between the thermal overload relay 1 and the electromagnetic contactor 50 is achieved by, for example, three connection line sleeves (not shown) formed on the cover 10 provided on the rear side of the thermal overload relay 1, 12c protruding from the sleeves 11a to 11c are electrically connected to the three connection terminals 51a to 51c of the electromagnetic contactor 50. [

Next, the operation of the thermal overload relay 1 of the present embodiment will be described.

First, the operation of the thermal overload relay when the reset bar 43 is in the manual reset state will be described.

3, the adjustment section 9a of the adjustment dial 9 is opened by opening the opening / closing cover 4. Therefore, the adjustment section 9a of the adjustment dial 9 is rotated by a tool such as a screwdriver The adjustment current can be adjusted by changing the rotation angle of the release lever 23.

In addition, a tool such as a driver inserted from the operation display / manual trip operation window 44 may be engaged with the trip operation rod 34a so that the thermal overload relay can be put into a manually tripped state. That is, the tool is engaged with the trip operation rod 34a to rotate the interlocking plate 34 in the initial state in FIG. 6 (a) clockwise around the support shaft 33. The second engaging pin 39b engaging with the movable plate 35 in accordance with the rotation of the interlocking plate 34 rotates the interlocking plate 34 in the direction of the tripped state, The fixed contact 38a and the movable contact 38b are connected. At this time, the stationary contact and the movable contact of the b contact (not shown) are spaced apart.

When the adjustment of the correction current or the confirmation of the manual trip state is completed in this way, by closing the opening / closing cover 4, the adjusting portion 9a of the adjusting dial 9 and the operation display / manual tripping window 44 are opened / closed 4). On the other hand, the head portion of the reset bar 43 protrudes upward through the inside of the through hole 5 of the opening / closing cover 4. At this time, the engaging convex portion 6 formed on the opening / closing cover 4 is engaged with the lock concave portion 43g of the reset bar 43 and the rotation of the reset bar 43 is locked, 43 are allowed to be pressed only.

Therefore, in the manual reset state, it is impossible to adjust the correction current by the adjustment dial 9 and to operate the manual trip.

When an overload current flows in the thermal overload relay of the present embodiment, as shown in Fig. 5, the heater 15a is heated by the overload current and the main bimetal 15 is curved, The shifter 16 is displaced in the direction indicated by the arrow Q in Fig. When the free end of the temperature compensating bimetal 24 is pressed by the displaced shifter 16, the releasing lever 23 integrated with the temperature compensating bimetal 24 is pivoted to the pivot shaft 23a supported on the adjusting link 22, So that the tension coil spring pressing portion 23f of the release lever 23 presses the tension coil spring 36. As a result,

When the release lever 23 is pivoted clockwise and the urging force of the tension coil spring urging portion 23f exceeds the spring bias force of the tension coil spring 36, (35) performs a reverse operation with the lower portion (35a) as a fulcrum. The interlocking plate 34 to which the reversing operation of the movable plate 35 is transmitted via the first engaging pin 39a is also rotated around the supporting shaft 33 in conjunction with the reversing operation of the movable plate 35 (See Fig. 6 (b)).

As a result, the stationary contact point 38a and the movable contact point 38b of the a-contact point 38, which are in the open state in Fig. 6 (a), are connected to each other and the stationary contact point and the movable contact point of the b- Based on the information of the a-contact point 38 and the b-contact point, for example, the electromagnetic contactor 50 connected to the main circuit is opened to cut off the overload current.

When the main bimetal 15 has sufficiently returned its curvature after the main circuit current is interrupted and then the manual reset is performed, the reset bar 43 in the manual reset state is set to a state shown by a dotted line in Fig. 5 I push it downward.

The reset piece 43h of the reset bar 43 is brought into contact with the movable plate 35 which is in the tripped state of Fig. 6 (b) by a reset load Lt; / RTI > Therefore, the movable plate 35 is returned to the initial position shown in FIG. 6 (b), and the interlocking plate 34 is moved to the initial state (normal state) via the second engaging pin 39b Resetting the thermal overload relay by returning.

2, the side surface of the head portion protruded from the opening / closing cover 4 of the reset bar 43 on the side of the electromagnetic contactor 50 is pressurized and regulated in the opening / closing cover 4, And is covered by the projection 7. 7 and 8, the coil terminal 52 at the right end of the electromagnetic contactor 50 opposed to the reset bar 43 is connected to the coil terminal 52 of the electromagnetic contactor 50, 8, the wiring 53 is reset by the reset of the thermal overload relay 1 according to the routing state of the wiring 53 when the wiring 53 for energizing the coil is connected, The bar 43 may be in a state of being in contact with it. In this case, the press-fit regulating projection 7 formed on the opening / closing cover 4 is disposed on the side of the reset bar 43 on the side of the electromagnetic contactor 50. Therefore, the wiring 53 is routed through the upper portion of the press fitting regulating projection 7, so that it is possible to reliably prevent direct contact of the wiring 53 with the reset bar 43. Therefore, when the wiring passes over the reset bar 43 in accordance with the routing state of the wiring connected to the coil terminal 52 of the electromagnetic contactor 50 and the auxiliary terminal 55 on the left end side of the electromagnetic contactor 50, It is possible to reliably prevent the reset bar 43 from being press-fitted.

In addition, even when the wiring 53 is routed to the right end side of the reset bar 43 by extending the press fitting regulating projection 7 to the right end side of the reset bar 43 as described above, It is possible to prevent the wiring 53 from directly contacting the reset bar 43. Therefore, when the reset bar 43 is reset, the wiring 53 does not become a trouble, and a smooth reset operation of the reset bar 43 can be ensured.

3, the opening / closing cover 4 is opened so that the lock of the engagement protruding portion 6 and the reset bar 43 can be switched to the automatic reset state, So that the engagement between the recessed portions 43g is released. In this state, the tip of a tool such as a screwdriver is inserted into the groove hole 43a of the reset bar 43, and the reset bar 43 is pushed in.

Because of this operation, the rotation restricting portions 2a and 2b do not exist on both sides of the convex portion 43i formed on the reset bar 43 (see Fig. 5), so that the reset bar 43 can be rotated. In this state, the reset bar 43 is rotated clockwise by approximately 90 degrees. As a result, the convex portion 43i abuts against the bottom surface of the rotation restricting portion 2a, and the upward movement of the reset bar 43 is restricted.

The lock recess 43j formed in the head portion of the reset bar 43 can engage with the engaging convex portion 6 of the opening and closing cover 4 so that the opening and closing cover 4 can be closed . As described above, by closing the opening / closing cover 4, the engaging convex portion 6 of the opening / closing cover 4 engages with the locking concave portion 43j of the reset bar 43, So that the reset bar 43 is brought into the automatic reset state.

When the opening / closing cover 4 is closed so that the reset bar 43 is in the automatic reset state, the adjusting portion 9a of the adjusting dial 9 and the operation display / manual tripping window 44 are covered. Therefore, as in the manual reset state, the adjustment of the correction current by the adjustment dial 11 and the manual trip operation can not be performed even in the automatic reset state.

When the overload current flows in this state, the curvature of the main bimetal 15 is transmitted as the rotation of the release lever 23 through the shifter 16 and the temperature compensating bimetal 24, The urging spring pressing portion 29 presses the tension coil spring 36.

The tension coil spring 36 is configured such that the reversing operation is regulated by the first engaging pin 39a of the interlocking plate 34 on which the large diameter portion 43h1 of the reset piece 43h of the reset bar 43 abuts, The distance between the contacts of the fixed contact 38a and the movable contact 38b of the a contact 38 is small and the distance between the contacts of the fixed contact and the movable contact of the b contact which is not shown is small.

When the reset bar 43 is switched to the automatic reset state, the tension coil spring 36 does not complete the reversing operation even when the overload current flows, and when the main bimetal 15 is cooled, the tension coil spring 36 ) Automatically returns to the initial state.

As described above, according to the first embodiment, the opening / closing cover 4 covering the upper surface of the casing 2 of the thermal overload relay 1 is provided with the press fitting regulating projection 7 for regulating the press-in of the reset bar 43 Fitting regulating projection 7 is disposed along the back surface and the right side surface of the reset bar 43 in a state where the opening and closing cover 4 is closed. Therefore, the reset operation using the normal tool of the reset bar 43 is not affected, and it is possible to regulate the press-fit operation due to external factors such as routing of wiring, for example, other than the reset operation for the reset bar 43 have. Therefore, it is possible to reliably prevent a malfunction in which the reset bar 43 is unnecessarily pushed into the reset state.

At this time, in the manual reset state or the automatic reset state, the engaging convex portion 6 formed on the opening / closing cover 4 engages with the locking concave portion 43g or 43j of the reset bar 43 so that the reset bar 43 Can be prevented from rotating.

In the manual reset state or the automatic reset state, the opening / closing cover 4 is used to open and close the adjusting portion 9a of the adjusting dial 9 disposed on the upper portion of the casing 2, 44 are covered. For this reason, it is impossible to adjust the correction current by the adjustment dial 9 and to operate the manual trip, thereby making it possible to prevent an operation error of the thermal overload relay.

Next, a second embodiment of the present invention will be described with reference to Figs. 9 to 12. Fig.

In the second embodiment, the press fitting regulating projection is formed on the cover 10 instead of the opening / closing cover 4. [

In the second embodiment, as shown in Figs. 9 to 12, a press-fitting regulating projection 7 is formed on a cover 10 detachably attached to the back surface side of the thermal overload relay 1. As shown in Fig. 9 to 12 show a state in which the opening and closing cover 4 is removed.

12, the cover 10 covers the opening formed in the bottom surface and the bottom surface of the casing 2 and includes a bottom plate portion 10a and a pair of left and right end portions of the bottom plate portion 10a upward Left and right side plate portions 10b and 10c extending at a relatively low height and a back plate portion 10d connected to the back surface side of the bottom plate portion 10a and the left and right side plate portions 10b and 10c.

11, a connecting leg 13 that engages with the electromagnetic contactor 50 when the electromagnetic contactor 50 is assembled with the electromagnetic contactor 50 is protruded from the lower surface of the back plate portion 10d . The above-described connecting line sleeves 11a to 11c are protruded from the upper end of the back plate portion 10d and the connecting lines 12a to 12c are protruded from these connecting line sleeves 11a to 11c. The connection line sleeves 11a to 11c are protruded from a common flat plate-like base portion 11d.

An intermediate end portion (intermediate step portion) 10e is formed on the right end side of the upper end side of the back plate portion 10d. A guide surface 10f for guiding the outer peripheral surface of the rear end side of the reset bar 43 is formed at the front end portion of the intermediate end portion 10e and a press fitting regulating projection 7 Are integrally formed. The reset bar 43 is guided so as to be vertically movable by the guide surface 2a formed on the casing 2 and the guide surface 10f formed on the cover 10. [

13, a cutout 4a for allowing the reset bar 43 and the press-fitting regulating projection 7 to be in contact with each other is formed in the opening / closing cover 4, Engaging convex portion 6 is formed on the surface of the reset bar 43 opposite to the left end side.

The second embodiment has the same configuration as that of the first embodiment except for the above-described configuration, and the same reference numerals are used for corresponding parts to the first embodiment, and detailed description thereof is omitted.

According to the second embodiment, when the cover 10 is inserted into the casing 2 from the back side in a state where the reset bar 43 is arranged on the back side of the casing 2 of the thermal overload relay 1 , The bottom surface and the back surface of the casing 2 can be covered with the cover 10.

At this time, the reset bar 43 is guided so as to be slidable in the vertical direction by the guide surface 10f formed in the cover 10 and the guide surface 2a formed in the casing 2, and the casing 2 of the reset bar 43 Fitting regulating projection 7 is disposed so as to surround the back side and the right side of the head portion protruding from the upper surface of the head portion.

Therefore, the side of the electromagnetic contactor 50 and the right side of the reset bar 43 are surrounded by the press fitting regulating projection 7. The wiring 53 is connected to the coil terminal 52 of the electromagnetic contactor 50 while the electromagnetic contactor 50 is connected to the rear surface side of the thermal overload relay 1 as in the first embodiment described above, The wiring 53 is brought into contact with the state of the press fitting regulating projection 7 when the wiring 53 is routed so as to contact the upper surface of the reset bar 43 when the wiring 53 is connected. Therefore, it is possible to reliably prevent the wiring 53 from touching the upper end of the reset bar 43. Therefore, the reset bar 43 is prevented from being pressed to the reset position according to the routing state of the wiring 53, thereby preventing malfunction.

In addition, the press fitting regulating projection 7 extends to the right side of the reset bar 43 as well. Thereby, it is also possible to reliably prevent the wiring 53 from contacting the right side surface of the reset bar 43, so that the reset operation of the reset bar 43 can be performed smoothly.

In addition, since the press fitting regulating projection 7 is formed on the cover 10, the press fitting regulating protrusion 7 can be brought close to the side surface of the reset bar 43 and also serves as the guide surface of the reset bar 43 .

When the press fitting regulating projection 7 is formed on the opening and closing cover 4 as in the first embodiment, the press fitting regulating projection 7 does not contact the reset bar 43 when the opening and closing cover 4 is opened or closed It is necessary to form the press fitting regulatory projection 7 at a position slightly apart from the reset bar 43, and the guide function of the reset bar 43 can not be exerted.

In the second embodiment, the case where the guide surface 10f of the reset bar 43 and the press fitting regulating projection 7 are formed on the cover 10 has been described. However, the present invention is not limited to this, It is also possible to omit the guide surface of the reset bar 43 and to support the reset bar 43 so as to be slidable in the vertical direction only by the casing 2 and to form the press fitting regulating projection 7 only on the cover 10. [

In the second embodiment described above, the opening / closing cover 4 is omitted, and a slidable (not shown) slider capable of covering or opening the adjustment section 9a of the adjustment dial 9, the operation display / manual trip operation window 44 It is also possible to provide a sliding cover and to form the engaging convex portion 6 on the sliding cover.

In the first and second embodiments, the press-fitting regulating projection 7 is formed in the shape of a plate. However, the present invention is not limited to this. The outer peripheral surface on the opposite side of the reset bar 43, Or the like.

Likewise, the planar shape of the press fitting regulating projection 7 may be such that it is possible to avoid press-fitting by the contact of the reset bar 43 with wiring or the like, and it is possible to cover half of the circumference of the reset bar 43 , About 3/4 weeks, and the circumferential length of the press-fitting regulatory projection can be arbitrarily set.

In the first and second embodiments, the opening and closing cover 4 is configured to be opened and closed by the hinge portion 3, but the present invention is not limited to this, It may be detachably attached from the side.

In the first and second embodiments, the case where the electromagnetic contactor 50 is connected to the thermal overload relay 1 has been described. However, the present invention is not limited to this, Or the like may be connected.

One; Thermal overload relay
2; Casing
4; Opening cover
5; Through hole
6; Engaging convex portion
7; The press fitting regulating projection (protruding portion)
8; Projecting pieces
9; Adjustment dial
10; cover
15; Main bimetal
15a; heater
16; Shifter
20; Adjustment mechanism
21; Contact reversing mechanism
22; Adjustment link
23; Release lever
24; Temperature compensated bimetal
25; Link support
34; Interlock plate
34a; Trip operation rod
35; Movable plate
36; Tension coil spring
37; a Contact spring spring
39a; The first engaging pin
39b; The second engaging pin
43; Reset bar
43a; Groove hole
43b-43e; Support column
43f; Locking piece (piece)
43g; The locking recess
43h; Reset piece
43i; Convex portion
43j; The locking recess
44; Operation display · Manual trip operation window (window)
45; Control unit
50; Magnetic contactor

Claims

A main bimetal for detecting and displacing an overload and a release lever for moving a displacement of a shifter interlocking with the main bimetal, A contact reversing mechanism for performing a reversal operation in accordance with the rotation of the release lever to switch the contact point and an operation section for operating the release lever and the contact reversal mechanism are disposed, And a reset bar for returning the contact reversing mechanism to an initial state by an operation, the heat bar overload relay comprising:
Wherein the casing has an opening / closing cover which covers the operating portion and has a through-hole for penetrating and inserting the reset bar,
Wherein the reset bar is configured to be switchable between a manually retractable manual reset position and an automatic reset position maintained in a press-fit state by an operation of depressing the manual reset position, wherein the manual reset position is formed by a latching concave And the engaging convex portion formed in the through hole of the opening / closing cover is held by engaging by closing the opening / closing cover,
And a press-fit regulating protrusion (protrusion) for regulating a press-fitting operation by an external factor other than a reset operation to the reset bar is disposed in the vicinity of the reset bar.

The method according to claim 1,
Wherein the press-fitting restricting projection is formed on the back surface side connecting the external connecting device of the reset bar.

3. The method according to claim 1 or 2,
And the press-fitting regulating projection is formed around the through-hole.

3. The method according to claim 1 or 2,
The casing is detachably mounted to the case so that the opening of the case can be closed by closing the main bimetal, the release lever, the contact reversal mechanism, and the operation unit, Wherein the cover has a cover provided with a connection line passing portion for projecting a plurality of connection lines to be connected to the connecting equipment of the connecting device, and the cover has the press fitting regulating protrusion.

3. The method of claim 2,
Wherein the press-fitting restricting projection is formed to prevent press-fitting of the reset bar due to contact of wiring connected to the external connecting device.

5. The method of claim 4,
Wherein the press-fitting restricting projection is formed to prevent press-fitting of the reset bar due to contact of wiring connected to the external connecting device.