WO2023149129A1 - サーマルリレー - Google Patents
サーマルリレー Download PDFInfo
- Publication number
- WO2023149129A1 WO2023149129A1 PCT/JP2022/047687 JP2022047687W WO2023149129A1 WO 2023149129 A1 WO2023149129 A1 WO 2023149129A1 JP 2022047687 W JP2022047687 W JP 2022047687W WO 2023149129 A1 WO2023149129 A1 WO 2023149129A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- movable plate
- contact
- spring
- reversing mechanism
- thermal relay
- Prior art date
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- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H61/00—Electrothermal relays
- H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
- H01H61/063—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts making use of a bimetallic element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H61/00—Electrothermal relays
- H01H61/01—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
- H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
Definitions
- the present invention relates to a thermal relay that protects a load (for example, a motor) from overcurrent by connecting it to a circuit breaker for wiring, an electromagnetic contactor, or the like.
- a load for example, a motor
- the thermal relay of Patent Document 1 includes a bimetal that bends and displaces upon detection of an overload current, a release lever that follows the displacement of a shifter that interlocks with the bimetal, and a contact that performs a reversal operation by rotating the release lever to switch the contact. and a reversing mechanism.
- the contact reversing mechanism includes a movable plate disposed on the reversing mechanism support portion so that one end is a fulcrum and the other end is swingable; and a reversing spring stretched between the other end side of the movable plate located on the opposite side and the spring supporting portion formed in the reversing mechanism supporting portion.
- the reversing mechanism support portion of Patent Document 1 includes a pair of movable plate holding arms extending parallel to each other, and engagement grooves are formed on the lower end sides of the pair of movable plate holding arms.
- One end of the movable plate is supported by the engaging grooves of the pair of movable plate holding arms as a fulcrum, and the other surface of the other end of the movable plate leans on the upper part of the pair of movable plate holding arms, thereby forming a pair of movable plate holding arms.
- the movable plate holding arm of supports the movable plate in a fallen state.
- a thermal relay includes a bimetal that bends and displaces upon detection of an overload current, a release lever that follows the displacement of a shifter that interlocks with the bimetal, and the release lever.
- a thermal relay having a contact reversing mechanism for reversing a contact by rotating.
- the contact reversing mechanism is arranged on the reversing mechanism support part so that one end is a fulcrum and the other end is swingable. and a reversing spring stretched between the other end side of the movable plate and the spring supporting portion formed in the reversing mechanism supporting portion.
- the reversing mechanism support portion includes a pair of first movable plate holding arms formed with a V-shaped support groove on which one end of the movable plate rests, and one of the first movable plate holding arms extending from the other end of the movable plate. a second movable plate holding arm that supports the movable plate in a state in which the movable plate is tilted with a constant tilting amount.
- the thermal relay of the present invention since the movable plate is supported while leaning on the second movable plate supporting portion of the reversing mechanism supporting portion, it is possible to greatly suppress variations in the tilting amount of the movable plate.
- the position of the movable contact can be finely adjusted with high precision, and the opening/closing position of the contact can be stabilized.
- FIG. 1 It is a perspective view showing the appearance of a thermal relay according to the present invention. It is a figure which shows the internal structure of the thermal relay which concerns on this invention.
- (a) is a diagram showing a contact reversing mechanism and a state contact (a contact) in a steady state
- (b) is a diagram showing a contact reversing mechanism and the like in a tripped state.
- FIG. 10 is a diagram showing a state in which a reversing mechanism supporting portion supports a movable plate that is tilted by a predetermined tilt amount; A state in which the first hook-shaped engaging portion is engaged with the engaging concave portion of the movable plate, and the second hook-shaped engaging portion is engaged with the V-shaped engaging groove of the spring support portion to mount the tension coil spring. It is a figure which shows. It is a figure which shows the hook positioning wall continuously formed in the V-shaped engagement groove of a spring support part.
- FIGS. 3 to 6 show the X direction and Y direction orthogonal to each other, and the Z direction orthogonal to a plane including the X direction and Y direction, while describing the specific configuration of each member.
- FIG. 1 shows the appearance of a thermal relay 1 of one embodiment according to the present invention.
- the insulating case of the thermal relay 1 is composed of an upper case 2a, a lower case 2b and a side case 2c, and an opening/closing cover 3 that can be opened and closed by means of a hinge portion 3a is arranged on the upper portion of the upper case 2a.
- It is Main terminals 4a to 4c and auxiliary terminals 5a to 5d are arranged in the upper case 2a, and rod terminals 6a to 6c protrude outside from the side case 2c.
- FIG. 2 shows the inside of the thermal relay 1 with the cover consisting of the lower case 2b and the side case 2c removed.
- the thermal relay 1 Inside the thermal relay 1, three sets of heat elements 8a to 8c corresponding to the three phases of the main circuit are engaged with the bimetal 9 of the heat elements 8a to 8c and arranged to be slidable in the horizontal direction in FIG. an adjustment mechanism 11 that follows the slide of the shifter 10;
- a normally open contact (a contact) 30 is arranged in which the movable contact 30a and the fixed contact 30b are separated when the adjusting mechanism 11 does not operate.
- a normally closed contact (b contact) with which the fixed contact and the movable contact are in contact when the adjusting mechanism 11 does not operate is arranged on the back side of the contact reversing mechanism 12 .
- An a-contact 30 is connected between the auxiliary terminals 5a and 5b, and a b-contact is connected between the auxiliary terminals 5c and 5d.
- the adjusting mechanism 11 comprises, as shown in FIG. and an ambient temperature compensating bimetal 16 that compensates for
- the adjustment link 14 is composed of a link support portion 17 supporting the release lever 15 and a leg portion 18 extending downward from one side of the link support portion 17 .
- a support shaft 19 is provided on the inner wall of the lower side of the case so as to protrude into the upper case 2a. 14 as a whole is rotatably supported on the upper case 2a about a support shaft 19.
- the release lever 15 is formed with a pivot shaft 15a rotatably supported by the link support portion 17 of the adjustment link 14.
- a reversing spring pressing portion 15b is formed at the lower portion of the release lever 15 with the pivot shaft 15a interposed therebetween.
- a cam contact portion 15c is formed at the bottom, and the free end is fixed to one end of an ambient temperature compensating bimetal 16 positioned below.
- the contact reversing mechanism 12 includes a reversing mechanism support portion 20 supported inside the upper case 2a, and a contact reversing mechanism support portion 20 disposed in the vicinity of the reversing mechanism support portion 20.
- an interlocking plate 22 rotatably supported by a support shaft 21 provided in the upper part of the movable plate 23;
- a reversing spring 24 made of a tension coil spring stretched between the lower portions of the reversing mechanism supporting portion 20 and an a-contact fixing portion 25 are provided.
- the reversing mechanism support part 20 is a member that is formed into a predetermined shape by punching a metal plate and is bent at a predetermined position.
- the reversing mechanism support portion 20 includes a support base portion 35 extending in the Z direction, the aforementioned auxiliary terminal 5b extending in the Y direction from the support base portion 35, and one end of the support base portion 35 in the Z direction.
- a pair of first movable plate holding arms 36 and 37 that are bent in the X direction and extend parallel to each other, and the ends of the first movable plate holding arms 36 are bent in the Z direction away from the support base 35 .
- a spring support portion 39 extending in the X direction from which the first movable plate holding arms 36 and 37 extend from the other end of the support base 35 in the Z direction. .
- the pair of first movable plate holding arms 36, 37 are formed with V-grooves 36a, 37a with which the lower surface of the movable plate 23 abuts on the surface portion in the plate thickness direction. These V-grooves 36a and 37a are formed by the same press working process, and their valley lines are aligned in the X direction and extend straight in the Y direction.
- the second movable plate holding arm 38 is formed with a protrusion 40 that protrudes spherically in the X direction on the side of the first movable plate holding arm 36 on the surface portion in the plate thickness direction.
- the protrusion 40 is formed by performing bossing molding using a press.
- FIG. 5 shows the movable plate 23 supported in an inclined state ( fallen state) by the pair of first movable plate holding arms 36 and 37 and second movable plate holding arm 38 .
- a movable contact 30 a of the a-contact 30 is provided on the surface 23 a of the movable plate 23 .
- the lower portion 23c of the movable plate 23 rests on the V grooves 36a and 37a of the first movable plate holding arms 36 and 37 of the reversing mechanism support portion 20, and the rear surface 23b leans against the protrusion 40 formed on the second movable plate holding arm 38.
- the movable plate 23 has an engaging recess 41 formed by cutting out the upper side thereof.
- a V-shaped engagement groove 42 extending in the X direction is formed on the lower surface of the tip of the spring support portion 39 .
- the first hook-shaped engaging portion 24a of the reversing spring 24 is engaged with the engaging recess 41, and the second hook-shaped engaging portion 24b is engaged with the engaging groove 42. and the spring support portion 39 of the reversing mechanism support portion 20 .
- FIG. 7 is an enlarged view of the spring support portion 39 of the reversing mechanism support portion 20.
- a A hook positioning wall 43 is formed extending to the other side.
- the a-contact fixing portion 25 includes the aforementioned auxiliary terminal 5a extending from the fixing base portion 26 in one direction in the Y direction, and the auxiliary terminal 5a fixed to the fixing base portion 26 in the Z direction.
- a leaf spring 27 extending in one direction is provided, and a fixed contact 30 b of the a-contact 30 is provided on the free end side of the leaf spring 27 .
- a first engagement pin 44a and a second engagement pin 44b for rotating the interlocking plate 22 around the support shaft 21 along with the reversing operation and return operation of the movable plate 23 are provided on the surface 22a side of the interlocking plate 22. is provided so as to be engageable with. Further, on the back side of the interlocking plate 22, although not shown, a movable contact and a fixed contact of a normally closed contact (b contact) are arranged.
- the movable plate 23 When the clockwise rotation of the release lever 15 progresses and the pressing force of the reversing spring pressing portion 15b exceeds the spring biasing force of the reversing spring 24, the movable plate 23 performs a reversing operation with the lower portion as a fulcrum. Along with this reversing motion of the movable plate 23 , the interlocking plate 34 to which the reversing motion of the movable plate 23 is transmitted via the first engagement pin 44 a also rotates around the support shaft 21 . As a result, as shown in FIG. 3B, the movable contact 30a and the fixed contact 30b of the a-contact 30 are closed, and the fixed and movable contacts of the b-contact, which were closed (not shown), are opened. trip state. Based on the information about the a-contact 30 and the b-contact in the trip state, for example, an electromagnetic contactor (not shown) connected to the main circuit is opened to cut off the overload current.
- an electromagnetic contactor (not shown
- the movable plate 23 is supported in a state where it leans against the projections 40 formed on the second movable plate holding arm 38 of the reversing mechanism support portion 20, and it is difficult to form a pair of movable plates having the same shape.
- the variation in the tilting amount of the movable plate 23 can be greatly suppressed, and the position of the movable contact 30a provided on the movable plate 23 can be precisely positioned. Can be set. Thereby, the opening/closing position of the a-contact 30 can be stabilized.
- the V-grooves 36a and 37a engaged with the lower surface of the movable plate 23 as a fulcrum are formed by pressing in the same process, and the valley lines of the V-grooves 36a and 37a are aligned in the X direction. , so as to extend linearly in the Y direction, the position of the lower surface of the movable plate 23 in the X direction can be set with high accuracy. Further, by forming the protrusion 40 on which the back surface 23b of the movable plate 23 rests by varying the amount of protrusion by boss molding using a press machine, it is possible to set the tilt amount of the movable contact 30a in the X direction with high accuracy. It is possible to finely adjust the position of the movable contact.
- the movable plate 23 is formed with the engaging recess 41 by cutting the upper side thereof, the first hook-shaped engaging portion 24a of the reversing spring (tension coil spring) 24 can be easily engaged with the engaging recess 41 from above. can be combined.
- the second hook-shaped engaging portion 24b of the reversing spring 24 engages with the engaging groove 42 of the spring supporting portion 39 of the reversing mechanism supporting portion 20. is formed so that the second hook-shaped engaging portion 24b can be brought into contact with the hook positioning wall 43 and then guided to the engaging groove 42. As shown in FIG. In this manner, the first hook-shaped engaging portion 24a of the reversing spring 24 is easily engaged with the engaging recess 41 of the movable plate 23 from above, and the second hook-shaped engaging portion 24b of the reversing spring 24 is connected to the hook positioning wall. 43, and then lead to the engagement groove 42 for engagement. Automatic assembly of the reversing spring 24 into the engaging recess 41 of the movable plate 23 and the engaging groove 42 of the spring support portion 39 can be realized.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
- Breakers (AREA)
Abstract
Description
特許文献1のサーマルリレーは、過負荷電流を検知して湾曲変位するバイメタルと、バイメタルに連動するシフタの変位に従動する釈放レバーと、釈放レバーの回動により反転動作を行ない、接点を切り替える接点反転機構と、を備えている。接点反転機構は、一端を支点とし他端側を揺動自在として反転機構支持部に配置されている可動板と、可動板の一方の面に設けた接点の可動接点と、支点を挟んで互いに逆側に位置する可動板の他端側及び反転機構支持部に形成したばね支持部の間に張架された反転ばねと、を備えている。
そこで、本発明は、可動板の倒れ量のばらつきを抑制して可動接点の位置を高精度に設定し、可動接点の位置の微調整も可能とすることで、接点の開閉位置を安定させることができるサーマルリレーを提供することを目的としている。
図1は、本発明に係る1実施形態のサーマルリレー1の外観を示している。サーマルリレー1の絶縁性を有するケースは、上ケース2aと、下ケース2b及び側部ケース2cからなるカバーで構成され、上ケース2aの上部に、ヒンジ部3aによって開閉自在な開閉カバー3が配置されている。上ケース2aには、主端子4a~4c及び補助端子5a~5dが配置されており、側部ケース2cから外部にロッド端子6a~6cが突出している。
調整リンク14は、釈放レバー15を支持するリンク支持部17と、リンク支持部17の一側から下方に延在している脚部18とで構成されている。
釈放レバー15は、調整リンク14のリンク支持部17に回転自在に支持される回動軸15aが形成されており、回動軸15aを挟んで下部に反転ばね押圧部15bが形成され、且つ上部にカム接触部15cが形成されているとともに、自由端が下方に位置する周囲温度補償バイメタル16の一端に固定されている。
また、図7は、反転機構支持部20のばね支持部39を拡大して示したものであり、係合溝42の支持基部35側の端部には、係合溝42より下方(Z方向の他方)に延在するフック位置決め壁43が形成されている。
また、連動板22の裏面側にも、図示しないが、常閉接点(b接点)の可動接点及び固定接点が配置されている。
図2に示すように、主回路に過負荷電流が流れてヒートエレメント8a~8cのヒータが発熱すると、バイメタル9が湾曲し、その自由端の変位によってシフタ10が図1の矢印方向に変位する。変位したシフタ10によって周囲温度補償バイメタル16の自由端が押圧されると、温度補償バイメタル16に一体化された釈放レバー15が、調整リンク14に支持された回動軸15a回りに時計方向に回動していき、釈放レバー15の反転ばね押圧部15bが反転ばね24を押圧する。
これにより、図3(b)に示すように、a接点30の可動接点30a及び固定接点30bが閉状態となり、図示しないが閉状態となっていたb接点の固定接点及び可動接点が開状態とされてトリップ状態となる。このトリップ状態のa接点30及びb接点の情報を基に、例えば主回路に接続した電磁接触器(不図示)を開極動作させて過負荷電流を遮断する。
本実施形態は、反転機構支持部20の第2可動板保持腕38に形成した突起40に可動板23が寄り掛かった状態で支持されており、同一形状に形成することが難しい一対の可動板保持腕に可動板が寄り掛かっている従来装置と比較して、可動板23の倒れ量のばらつきを大幅に抑制することができ、可動板23に設けている可動接点30aの位置を高精度に設定することができる。これにより、a接点30の開閉位置の安定化を図ることができる。
また、可動板23の裏面23bが寄り掛かる突起40を、プレス機によるボス出し成形で突出量を変化させて形成することで、可動接点30aのX方向の倒れ量を高精度に設定することができるとともに、可動接点の位置の微調整を行うことができる。
また、可動板23には上辺を切り欠いて係合凹部41が形成されているので、反転ばね(引張りコイルバネ)24の第1フック状係合部24aを上方から容易に係合凹部41に係合することができる。
2a 上ケース
2b 下ケース
2c 側部ケース
3 開閉カバー
4a~4c 主端子
5a~5d 補助端子
6a~6c ロッド端子
8a~8c ヒートエレメント
9 バイメタル
10 シフタ
11 調整機構
12 接点反転機構
14 調整リンク
15 釈放レバー
15a 回動軸
15b 反転ばね押圧部
15c カム接触部
16 周囲温度補償バイメタル
17 リンク支持部
18 脚部
18a 軸受穴
19 支軸
20 反転機構支持部
21 支軸
22 連動板
23 可動板
24 反転ばね
24a 第1フック状係合部
24b 第2フック状係合部
25 a接点固定部
26 固定基部
27 板ばね
30 a接点
30a 可動接点
30b 固定接点
35 支持基部36,37 第1可動板保持腕
36a,37a V溝(V字形状の支持溝)
38 第2可動板保持腕
39 ばね支持部
40 突起(位置決め突起)
41 係合凹部
42 係合溝(V字形状の係合溝)
43 フック位置決め壁
44a 第1係合ピン
44b 第2係合ピン
Claims (6)
- 過負荷電流を検知して湾曲変位するバイメタルと、前記バイメタルに連動するシフタの変位に従動する釈放レバーと、この釈放レバーの回動により反転動作を行ない、接点を切り替える接点反転機構と、を有するサーマルリレーにおいて、
前記接点反転機構は、一端を支点とし他端側を揺動自在として反転機構支持部に配置され、一方の面に接点の可動接点を設けている可動板と、前記支点を挟んで互いに逆側に位置する前記可動板の他端側及び前記反転機構支持部に形成したばね支持部の間に張架された反転ばねと、を備え、
前記反転機構支持部は、前記可動板の前記一端が前記支点として載るV字形状の支持溝が形成された一対の第1可動板保持腕と、一方の前記第1可動板保持腕から延在し、前記可動板の前記他端側が寄り掛かり、倒れ量を一定にして前記可動板を倒れた状態で支持する第2可動板保持腕と、を備えていることを特徴とするサーマルリレー。 - 前記一対の第1可動板保持腕に形成した前記支持溝は、プレス加工で形成されていることを特徴とする請求項1記載のサーマルリレー。
- 前記第2可動板保持腕に、前記可動板の他方の面が寄り掛かる位置決め突起が形成されていることを特徴とする請求項1又は2記載のサーマルリレー。
- 前記位置決め突起は、ボス出し成形で形成されていることを特徴とする請求項3記載のサーマルリレー。
- 前記反転ばねは、両端に第1及び第2フック状係合部を設けた引張りコイルバネであり、
前記可動板の他端側には、辺部を切り欠いて係合凹部が形成され、前記反転機構支持部に形成した前記ばね支持部には、V字形状の係合溝が形成されており、
前記第1フック状係合部を前記可動板の係合凹部に係合し、前記第2フック状係合部を前記ばね支持部の前記係合溝に係合して装着した前記引張りコイルバネが、前記可動板に対して引張り力を付与することを特徴とする請求項1から4の何れか1項に記載のサーマルリレー。 - 前記ばね支持部には、前記係合溝に連続して形成されており、装着時に前記第2フック状係合部が当接することで当該第2フック状係合部を前記係合溝に導くフック位置決め壁が形成されていることを特徴とする請求項5記載のサーマルリレー。
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JP2023578420A JPWO2023149129A1 (ja) | 2022-02-04 | 2022-12-23 | |
KR1020247002626A KR20240024987A (ko) | 2022-02-04 | 2022-12-23 | 서멀 릴레이 |
CN202280052965.8A CN117716462A (zh) | 2022-02-04 | 2022-12-23 | 热动继电器 |
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JP2022-016602 | 2022-02-04 | ||
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000243203A (ja) * | 1999-02-23 | 2000-09-08 | Togami Electric Mfg Co Ltd | 熱動形過負荷継電器の接点開閉機構 |
JP2006344560A (ja) * | 2005-06-10 | 2006-12-21 | Mitsubishi Electric Corp | 熱動型過負荷継電器 |
JP2010251278A (ja) * | 2009-03-27 | 2010-11-04 | Fuji Electric Fa Components & Systems Co Ltd | 熱動形過負荷継電器 |
KR20150044745A (ko) * | 2013-10-17 | 2015-04-27 | 엘에스산전 주식회사 | 열동형 과부하 계전기 |
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JPS5152102Y2 (ja) | 1973-10-16 | 1976-12-14 |
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- 2022-12-23 JP JP2023578420A patent/JPWO2023149129A1/ja active Pending
- 2022-12-23 KR KR1020247002626A patent/KR20240024987A/ko unknown
- 2022-12-23 CN CN202280052965.8A patent/CN117716462A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000243203A (ja) * | 1999-02-23 | 2000-09-08 | Togami Electric Mfg Co Ltd | 熱動形過負荷継電器の接点開閉機構 |
JP2006344560A (ja) * | 2005-06-10 | 2006-12-21 | Mitsubishi Electric Corp | 熱動型過負荷継電器 |
JP2010251278A (ja) * | 2009-03-27 | 2010-11-04 | Fuji Electric Fa Components & Systems Co Ltd | 熱動形過負荷継電器 |
KR20150044745A (ko) * | 2013-10-17 | 2015-04-27 | 엘에스산전 주식회사 | 열동형 과부하 계전기 |
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CN117716462A (zh) | 2024-03-15 |
KR20240024987A (ko) | 2024-02-26 |
JPWO2023149129A1 (ja) | 2023-08-10 |
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