JP3568821B2 - Circuit breaker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a circuit interrupting device for interrupting an electric circuit in a short time, and more particularly to a circuit interrupting device which can easily determine that a circuit has been interrupted and can easily perform a circuit return after the circuit is interrupted.
[0002]
[Prior art]
In an electrical system installed in a vehicle, when an abnormality occurs in a load such as a power window, or in an abnormality occurs in a wire harness formed by a plurality of electric wires connecting a battery and each load, the battery is disconnected. The fuse between the battery and the wire harness is cut off by blowing the high-current fuse inserted between the wire harness and the wire harness, thereby preventing each load and the wire harness from burning out. Circuit breaker is provided.
[0003]
As a fuse used in such a circuit breaker, for example, a fuse described in JP-A-60-89030 is known. This fuse is, as shown in FIG. 9, an insulating cylinder 101, a terminal metal 102 for sealing both ends of the insulating cylinder 101, and a main fuse connected to the terminal metal 102 at both ends and having an end connected to the inside of the insulating cylinder 101. An element 103, an operation display device 104 for indicating that the fuse has operated by blowing the main fuse element 103, and an arc which is enclosed in the insulating cylinder 101 and the terminal metals 102 at both ends and is generated when the main fuse element 103 is blown. And an arc extinguishing agent 105 for extinguishing the arc.
[0004]
As shown in FIG. 10, the operation display device 104 includes a cup-shaped tubular portion 106 attached to one of the terminal bars 102, and a built-in tubular portion 106 for moving to the outside of the tubular portion 106 in a display operation direction. It is configured to include a display member 112 that constantly receives power.
[0005]
According to such an operation display device 104, the main fuse element 103 and the display fuse element 110 are electrically connected in parallel, the main fuse element 103 is configured with low resistance, and the display fuse element 110 is set high. It consists of a resistor.
[0006]
Therefore, usually, almost all of the current flows through the main fuse element 103. When an excessive current flows through the fuse, the main fuse element 103 melts and an arc is generated. This arc is extinguished by the action of the surrounding arc extinguishing agent 105 and becomes a high resistance. To commutate.
[0007]
When an excessive current flows through the display fuse element 110 and the display fuse element 110 is blown, the display member 112 having the display rod 109 whose binding force has been released is opened by the urging force of the pressing spring 108 to open the terminal metal 102. An indication that the fuse has operated is projected from the portion 102a.
[0008]
At this time, a small hole 114 as shown in FIG. 11 is formed in the fusion portion between the retaining portion 110c of the display fuse element 110 and the elastomer 113. The temperature inside the fuse becomes extremely high due to the generation of an arc due to the fusing of the main fuse element 103 and the display fuse element 110 and the decomposition of the arc extinguishing agent 105, and the air pressure becomes high.
[0009]
For this reason, the gas tries to blow out through the small hole 114, but as shown by the arrow in FIG. Prevents the gas inside from escaping into the air. For this reason, even if the fuse cools, moisture does not inhale into the inside unlike the conventional fuse, and the danger that the fargelite and the arc extinguishing agent 105 absorb moisture to lower the insulation resistance and cause reflashing occurs. Can be eliminated.
[0010]
[Problems to be solved by the invention]
However, in the fuse described in Japanese Patent Application Laid-Open No. 60-89030, although the operation display device 104 makes it easy to visually check whether or not the fuse is blown, the operation display device 104 is provided exclusively. . Therefore, there is a problem that the structure of the fuse is complicated and the cost of the fuse is increased.
[0011]
For this reason, it has been desired to determine whether or not the fuse is blown, that is, whether or not the circuit is interrupted, with a simple configuration and an inexpensive circuit interrupter. Further, there is a case where it is desired to temporarily return the circuit to the original state after the circuit is cut off, and a means for restoring the circuit has been desired.
[0012]
The present invention provides a simple and inexpensive circuit breaker that can easily and easily determine whether or not a circuit has been cut off, and can easily return to a circuit after the circuit has been cut off, in addition to a circuit that can be cut off reliably in a short time. The task is to
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configurations. The invention according to claim 1 is arranged between the first connection terminal and the second connection terminal, contacts the first connection terminal and the second connection terminal, has a heating agent, and has an abnormality in the vehicle. A heating unit having conductivity to ignite the heating agent by an abnormal signal from the outside sometimes, a melting member that melts when the heating agent included in the heating unit generates heat, and is disposed in contact with the heating unit, and A telescopic elastic member that presses the heating unit and moves the heating unit when the melting member is melted to cut off a circuit, and an outer housing that houses the elastic member, the heating unit, and the melting member. A container, wherein the outer container includes an upper case that moves with the movement of the heating unit, and a lower case that is covered by the upper case. Fix the caseProtrudingThe upper case is fixed after the circuit is cut off from the first fixing portion.ProtrudingWith the second fixing partAn open groove is formed in the upper case, the first fixing portion is engaged with a lower end portion of the groove before the circuit is interrupted, and the second fixing portion is engaged with the groove after the circuit is interrupted. Engages the lower end ofIt is characterized by the following.
[0014]
According to the invention of claim 1, before the circuit is cut off, the lower case is formed.ProtrudingThe first fixing portion fixes the upper case. Then, when the circuit is interrupted, the heating agent is ignited by an abnormal signal from the outside, and the heating agent generates heat and the melting member is melted. Therefore, the elastic member moves the heating unit to interrupt the circuit. After the circuit is cut off, the upper case moves with the movement of the heating unit,ProtrudingThe second fixing portion fixes the upper case. That is, the circuit can be cut off in a short time and surely, and it is possible to easily determine whether or not the circuit is cut off based on the fixing position of the upper case. In addition, the first fixing portion and the second fixing portion are provided on the lower case. Formed, it is not necessary to provide a special operation display device, and an inexpensive circuit breaker with a simple configuration can be provided.The first fixing portion is formed in the upper case before the circuit is cut off, and engages with a lower end portion of the opened groove, and the second fixing portion is formed in the upper case after the circuit is cut off. , The presence or absence of interruption of the circuit can be easily determined depending on which of the first fixing portion and the second fixing portion is engaged with the lower end portion of the groove.
[0017]
Claim2The present invention is characterized in that a circuit return member for returning the heating unit after the circuit interruption to the original position before the circuit interruption is provided.
[0018]
Claim2According to the invention, since the circuit return member returns the heating unit to the original position before the circuit interruption after the circuit interruption, the circuit can be temporarily restored.
[0019]
Claim3The invention is characterized in that the circuit return member is a member that presses the heating unit through a through hole formed in the upper case to return the heating unit to the original position.
[0020]
Claim3According to the invention, since the circuit return member is a member that presses the heating unit through the through hole formed in the upper case to return the heating unit to the original position, the circuit can be easily returned.
[0021]
Claim4The invention is characterized in that the melting member is a resin member formed in the outer container and for preventing the elastic member from pressing the heating portion.
[0022]
Claim4According to the invention, since the melting member is a resin member formed in the outer container and preventing the pressing force of the elastic member from being applied to the heating portion, the resin member melts and the heating portion rises when the heating agent is ignited. be able to.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the circuit breaker of the present invention will be described in detail with reference to the drawings.
[0024]
<First embodiment>
FIG. 1 is a cross-sectional view taken along line A-A of the circuit breaker of the first embodiment before and after circuit breakage. FIG. 2 is a top view of the circuit breaker of the first embodiment. FIG. 3 is a cross-sectional view taken along the line B-B of the circuit breaker of the first embodiment before circuit breakage. FIG. 4 is a detailed structural diagram of the upper case and the lower case of the circuit breaker according to the first embodiment. FIG. 5 is a cross-sectional view of the circuit breaker of the first embodiment after the circuit is restored.
[0025]
In the circuit breaker shown in FIG. 1, a long plate-like first bus bar 11 is made of, for example, copper or a copper alloy, and the first bus bar 11 has a round hole 12 connected to a battery or the like. ing. The first bus bar 11 is bent downward at a substantially right angle.
[0026]
The plate-like long second bus bar 19 is also made of, for example, copper or a copper alloy, and the second bus bar 19 has a round hole 20 connected to a load or the like. The second bus bar 19 is also bent downward at a substantially right angle.
[0027]
An upper case 14a and a lower case 14b are arranged between the first bus bar 11 and the second bus bar 19, and the upper case 14a and the lower case 14b form an outer container, and are formed of a resin ( It is made of a container made of an insulating material such as a thermoplastic resin.
[0028]
A thermite case 26 made of copper, a copper alloy, or the like is housed in the lower case 14b. The thermite case 26 is filled with a heating agent 27 and houses an ignition section 29. The upper lid 28a of the thermite case 26 is fastened by a bolt 28b so that the heating agent 27 is sealed.
[0029]
The igniting section 29 has an igniting agent, and ignites the igniting agent by heat generated by a current flowing through the lead wire 31 at the time of a vehicle abnormality such as a vehicle collision accident so that the heating agent 27 generates thermite reaction heat. Has become. In this case, a connector 33 for supplying a current from the lead wire 31 to the ignition portion 29 is attached so as to be connectable to the ignition portion 29.
[0030]
The left side wall formed in the thermite case 26 is joined to the bent portion 8 of the first bus bar 11 by a low melting point metal 23 as a low melting point material such as solder (for example, having a melting point of 200 ° C. to 300 ° C.). The right side wall formed in the thermite case 26 is joined to the bent portion 10 of the second bus bar 19 with the low melting point metal 23. Therefore, the first bus bar 11 and the second bus bar 19 can be electrically connected via the low melting point metal 23 and the thermite case 26.
[0031]
The low melting point metal 23 is made of, for example, at least one metal selected from Sn, Pb, Zn, Al, and Cu.
[0032]
The heating agent 27 is, for example, iron oxide (Fe₂O₃), And a thermite agent that generates high heat by causing a thermite reaction due to heat generation of the lead wire 31. In addition, iron oxide (Fe₂O₃) Instead of chromium oxide (Cr₂O₃), Manganese oxide (MnO)₂) May be used.
[0033]
Further, as the heating agent 27, at least one kind of metal powder selected from B, Sn, FeSi, Zr, Ti and Al, and CuO, MnO₂, Pb₃O₄, PbO₂, Fe₃O₄And Fe₂O₃Or a mixture of at least one metal oxide selected from the group consisting of alumina, bentonite, talc and the like. According to such a heating agent, it is easily ignited by the ignition part 29, and the low melting point metal 23 can be melted in a short time.
[0034]
Further, a compression spring 34 as an elastic member that can be extended and contracted is disposed between the thermite case 26 and the lower case 14b, and the compression spring 34 presses the thermit case 26 upward. As shown in FIG. 3, a projection 42 made of a resin member is formed on the lower case 14b. The projection 42 presses the upper surface of the thermite case 26, and the 26 is prevented from moving upward.
[0035]
As shown in FIG. 4, the upper case 14a includes a main body 35a having bent portions 38 formed at four corners, and a longitudinal portion 36 extending from two opposing side surfaces of the main body 35a. A rectangular groove 37 is formed in the long part 36. The lower case 14b includes a main body 35b and a longitudinal portion 39 extending from two opposing sides of the main body 35b.
[0036]
The first locking portion 40 (see FIG. 1) is formed in the longitudinal portion 39 formed in the lower case 14b at a position facing the groove 37 formed in the upper case 14a. And one second locking portion 41 (corresponding to the second fixing portion according to claim 1) that engages with the upper end portion of the groove portion 37. I have.
[0037]
The first locking portion 40 is gradually tapered from the lower side to the upper side, and determines the fixing position of the upper case 14a before the circuit is cut off. The second locking portion 41 is gradually tapered from the upper side to the lower side, and determines a fixing position of the upper case 14a with the upward movement of the thermite case 26 after the circuit is cut off. .
[0038]
Further, a through hole 16 is provided on the upper surface side of the upper case 14a, and a bolt 15 as a circuit return member can be inserted into the through hole 16. The bolt 15 includes a head portion 15a and a body portion 15b on which a screw is formed. The screw formed on the bolt 15 and the screw formed on the through hole 16 are screwed together, and the bolt 15 is moved downward. By moving, the thermite case 26 after the circuit interruption can be returned to the original position.
[0039]
Next, the operation of the circuit breaker of the first embodiment thus configured will be described with reference to the drawings.
[0040]
First, the upper case 14a is put on the lower case 14b. At this time, the groove 37 formed in the upper case 14a is put on the first locking portion 40 and the second locking portion 41 formed in the lower case 14b. Thereby, the first locking portion 40 is engaged with the lower end portion of the groove 37, and the second locking portion 41 is engaged with the upper end portion of the groove 37. Further, the upper surface of the thermite case 26 is engaged with the projection 42.
[0041]
Next, the circuit breaking operation of the circuit breaking device will be described. First, normally, the first bus bar 11 and the second bus bar 19 are electrically connected via the low melting point metal 23 and the thermite case 26, and a current is supplied from a battery (not shown) to a load (not shown).
[0042]
Next, when the vehicle collides with an obstacle or the like or the vehicle falls down from a cliff or the like, an abnormality of the vehicle is detected by a collision sensor or the like. Upon detection of a vehicle abnormality, a voltage is applied to the connector 33 through the lead wire 31. Then, a current flows to the ignition section 29 by the voltage applied to the connector 33.
[0043]
Then, since the ignition part 29 is ignited by the heat generated by the electric current, the heating agent 27 which is a thermite agent generates thermite reaction heat by the following reaction formula.
[0044]
Fe₂O₃+ 2AL → AL₂O₃+ 2Fe + 386.2Kcal
The thermite reaction heat heats the thermite case 26, and the heat generated by the heating agent 27 and the heat of the thermite case 26 cause the low melting point metal 23 joining the bent portion 8 and the left side wall of the thermite case 26 to bend. The low melting point metal 23 joining the part 10 and the right side wall of the thermite case 26 is heated and melted. At the same time, the protrusion 42 made of a resin member formed on the lower case 14b is melted by the heat.
[0045]
Then, the compressed compression spring 34 expands, and the thermite case 26 in which the ignition portion 29 is stored jumps upward (in FIG. 1, 26 'indicates the thermite case after being moved upward).
[0046]
Therefore, the electrical connection between the thermite case 26 and the first bus bar 11 and the second bus bar 19 is disconnected. That is, the first bus bar 11 and the second bus bar 19 are electrically cut off, and the electric circuit of the vehicle is cut off.
[0047]
When the thermite case 26 jumps upward, the thermite case 26 contacts the upper case 14a and lifts the upper case 14a. At this time, the lower end of the groove 37 of the upper case 14a is disengaged from the first locking portion 40 of the lower case 14b, and the lower end of the groove 37 moves to the second locking portion 41. Is engaged at the most protruding portion of the locking portion 41.
[0048]
As described above, according to the circuit breaker of the first embodiment, when the lower end portion of the groove 37 formed in the upper case 14a is at the position of the first locking portion 40, it is determined that the circuit is not broken. When the lower end portion of the groove 37 is at the position of the second locking portion 41, it can be easily determined that the circuit has been interrupted. That is, it is possible to easily determine whether the fuse or the low melting point metal 23 has blown.
[0049]
In addition, since the display device for determining whether or not the circuit is interrupted in the existing upper case 14a and lower case 14b is configured, no special display device is required. Therefore, an inexpensive circuit breaker with a simple structure is provided. can do.
[0050]
Also, by tightening the bolts 15 on the upper surface of the upper case 14a, the thermite case 26 that has moved upward after the circuit is shut off is returned to the original position before the circuit shut off as shown in FIG. Therefore, the circuit can be easily restored, and since the bolts 15 are simply attached to the existing upper case 14a and lower case 14b, an inexpensive device with a simple structure can be provided.
[0051]
Further, the electric circuit of the vehicle can be shut off in a short time and surely, and the electric parts can be protected. Further, since thermit reaction heat of the heating agent 27 is used, a circuit breaker having a simple structure can be provided.
[0052]
In addition, since the protrusion 42 formed on the lower case 14 b prevents the upward tension of the compression spring 34, the protrusion 42 which is a joint between the first bus bar 11 and the second bus bar 19 and the thermite case 26 is formed. Since no spring force is applied to the melting point metal 23, the reliability of the joint can be improved. Furthermore, when the joint is made of a low-melting metal such as solder, no stress is applied to the low-melting metal, so that cracks are eliminated.
[0053]
Here, the diffusion of the component means that the component element atoms of the solder spread on the surface and inside of the base material. In some cases, the diffused solder atoms and the base metal atoms rearrange into a new atomic arrangement having a certain crystal lattice, and this is an intermetallic compound (alloy layer). Since intermetallic compounds generally have a brittle property, cracks are easily caused by external stress such as vibration and bending.
[0054]
<Second embodiment>
Next, a circuit breaker according to a second embodiment of the present invention will be described. FIG. 6 is a view showing a plug which is a circuit return member provided in the circuit breaker of the second embodiment. The circuit breaker of the second embodiment uses a plug that is a circuit return member for a bolt that is a circuit return member provided in the circuit breaker of the first embodiment.
Since other configurations are the same as the configuration of the circuit breaker of the first embodiment, only the plug provided in the circuit breaker of the second embodiment and the configuration around the plug are described here. This will be described with reference to FIG. A circular opening 51 is formed on the upper surface of the upper case 14c, and two rod-shaped projections 52 are formed in the opening 51 at opposing positions.
[0055]
The plug 54 is made of resin or metal, has a substantially cylindrical shape, and can be inserted into the opening 51 formed in the upper case 14c. On the side surface of the plug 54, a plurality of first locking portions 55 for performing positioning in a normal state other than circuit return are formed.
[0056]
Further, two cutout portions 56 are formed on the side surface of the plug 54 and are gradually cut out upward from the bottom surface along the circumferential direction. The notch 56 has an introduction portion 57 for introducing the rod-shaped protrusion 52 and a second member for stopping the protrusion 52 which has slid the notch 56 by rotation of the plug 54 to perform positioning at the time of circuit return. A stop 58 is formed. A long groove 59 is formed on the upper surface of the plug 54 for rotating the plug 54 to move it downward.
[0057]
According to the circuit breaker of the second embodiment thus configured, first, the first locking portion 55 of the plug 54 is aligned with the opening 51 formed in the upper case 14c. Therefore, in a normal state other than the circuit return (for example, after the circuit is cut off), the thermite case 26 is stopped at the first locking portion 55.
[0058]
Next, at the time of circuit return, the rod-shaped projection 52 is introduced into the introduction portion 57 in the cutout 56 formed in the plug 54, and is pushed downward while rotating the long groove 59. The downward movement of the plug 54 causes the thermite case 26 to move downward and return to the original position, so that the circuit can be easily returned. Therefore, the circuit breaker according to the second embodiment also has the same effect as the circuit breaker according to the first embodiment.
[0059]
<Third embodiment>
Next, a circuit breaker according to a third embodiment of the present invention will be described. FIG. 7 is a diagram showing a state in which a clip serving as a circuit return member provided in the circuit breaker of the third embodiment is attached to the upper case. FIG. 8 is a diagram showing a detailed structure of the clip shown in FIG.
[0060]
The circuit breaker according to the third embodiment is characterized in that a clip serving as a circuit return member is used for a bolt serving as a circuit return member provided in the circuit breaker according to the first embodiment.
Since other configurations are the same as the configuration of the circuit breaker of the first embodiment, only the clip provided in the circuit breaker of the third embodiment and the configuration around the clip are described here. This will be described with reference to FIGS.
[0061]
A circular through hole 16a is formed on the upper surface of the upper case 14d, and a clip 61 made of resin or metal is inserted into the through hole 16a. The clip 61 has a first tapered portion 62 protruding in a tapered shape, a first locking portion 63 that engages with the through hole 16a in a normal state other than circuit return, and a diameter larger than the diameter of the first tapered portion 62. It is composed of a second tapered portion 64 having a large diameter, a second locking portion 65 that engages with the through hole 16a when the circuit returns, and a disk-shaped head 66.
[0062]
According to the circuit breaker of the third embodiment configured as described above, first, the first locking portion 63 of the clip 61 is fitted to the through hole 16a formed in the upper case 14d. Therefore, in a normal state other than the circuit return (for example, after the circuit is cut off), the thermite case 26 is stopped at the first locking portion 63.
[0063]
Next, at the time of circuit return, when the head 66 of the clip 61 is pushed downward, the second tapered portion 64 passes through the through hole 16a and stops at the position where the second locking portion 65 reaches the through hole 16a. I do.
[0064]
The downward movement of the clip 61 moves the thermite case 26 downward and returns to the original position, so that the circuit can be easily returned. Therefore, the circuit breaker according to the third embodiment has the same effect as the circuit breaker according to the first embodiment.
[0065]
It should be noted that the present invention is not limited to the circuit breakers of the first to third embodiments described above. In the circuit breaker of the first to third embodiments, the protrusion 42 formed on the lower case 14 b presses the upper surface of the thermite case 26, and the thermistor case by the spring force of the compression spring 34. 26 is prevented from moving upward.
[0066]
For example, by forming a screw portion in the thermite case 26, screwing the screw portion to a screw portion formed of a resin member formed in the lower case 14b, and tightening and fixing the thermite case 26 to the lower case 14b. The upward movement of the thermite case 26 due to the spring force of the compression spring 34 may be prevented.
[0067]
In this case, when the thermite case 26 is heated, the screw portion made of the resin member formed on the lower case 14b is melted, and the thermite case 26 is moved upward by the spring force of the compression spring 34, and the circuit is moved. Is shut off.
[0068]
Although the protrusion 42 and the screw portion are illustrated as the pressing prevention member, the invention is not limited thereto. In short, the thermit case formed by the compression spring 34 and formed on the upper case 14a or the lower case 14b as the pressing prevention member. Any configuration may be used as long as it is a resin member that prevents the pressing force on the resin member 26.
[0069]
【The invention's effect】
According to the first aspect of the present invention, the heating agent is ignited by an abnormal signal from the outside, the heating agent generates heat, and the melting member is melted. Therefore, the elastic member moves the heating unit to cut off the circuit. After the circuit is cut off, the upper case moves with the movement of the heating unit,ProtrudingThe second fixing portion fixes the upper case. That is, the circuit can be cut off in a short time and surely, and it is possible to easily determine whether or not the circuit is cut off based on the fixing position of the upper case. In addition, the first fixing portion and the second fixing portion are provided on the lower case. Formed, it is not necessary to provide a special operation display device, and an inexpensive circuit breaker with a simple configuration can be provided.The first fixing portion is formed in the upper case before the circuit is cut off, and engages with a lower end portion of the opened groove, and the second fixing portion is formed in the upper case after the circuit is cut off. , The presence or absence of interruption of the circuit can be easily determined depending on which of the first fixing portion and the second fixing portion is engaged with the lower end portion of the groove.
[0071]
Claim2According to the invention, since the circuit return member returns the heating unit to the original position before the circuit interruption after the circuit interruption, the circuit can be temporarily restored.
[0072]
Claim3According to the invention, since the circuit return member is a member that presses the heating unit through the through hole formed in the upper case to return the heating unit to the original position, the circuit can be easily returned.
[0073]
Claim4According to the invention, since the melting member is a resin member formed in the outer container and preventing the pressing force of the elastic member from being applied to the heating portion, the resin member melts and the heating portion rises when the heating agent is ignited. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along a line AA of a circuit breaker according to a first embodiment before and after circuit breakage.
FIG. 2 is a top view of the circuit breaker according to the first embodiment.
FIG. 3 is a cross-sectional view taken along the line B-B of the circuit breaker according to the first embodiment before circuit breakage.
FIG. 4 is a detailed structural diagram of an upper case and a lower case of the circuit breaker according to the first embodiment.
FIG. 5 is a cross-sectional view of the circuit breaker according to the first embodiment after circuit recovery.
FIG. 6 is a diagram showing a plug which is a circuit return member provided in the circuit breaker according to the second embodiment.
FIG. 7 is a diagram showing a state in which a clip serving as a circuit return member provided in the circuit breaker of the third embodiment is attached to an upper case.
FIG. 8 is a view showing a detailed structure of the clip shown in FIG. 7;
FIG. 9 is a diagram showing a cross section of a conventional fuse.
10 is a diagram showing a state before the operation display device provided in the fuse shown in FIG. 9 operates.
FIG. 11 is a diagram showing a state after the operation display device operates.
[Explanation of symbols]
11 First bus bar
13,21 Busbar tip
14a Upper case
14b Lower case
15,28b bolt
19 Second busbar
23 Low melting point metal
26 Thermite Case
27 Heating agent
28a Top lid
29 Ignition
31 Lead wire
34 compression spring
36,39 Long section
37 groove
40, 55, 63 First locking portion
41, 58, 65 Second locking portion
42, 52 protrusion
51 Opening
54 plug
56 Notch
57 Introduction
59 Long groove
61 clips
62 First tapered portion
64 Second tapered portion

Claims (4)

It is arranged between the first connection terminal and the second connection terminal, contacts the first connection terminal and the second connection terminal, has a heating agent, and receives an external abnormality signal when the vehicle is abnormal. A heating unit having conductivity to ignite the heating agent,
A melting member that melts when the heating agent has heat generated in the heating unit,
A stretchable elastic member that is arranged in contact with the heating unit and presses the heating unit, and moves the heating unit to cut off a circuit when the melting member is melted,
The elastic member, the heating unit, and an outer container for storing the melting member,
The outer container includes an upper case that moves with the movement of the heating unit, and a lower case that covers the upper case, and the lower case has a protrusion that fixes the upper case before a circuit is interrupted. the have a second fixing portion protruding fixing the upper case after the first fixing portion and the circuit breaker of Jo,
An open groove is formed in the upper case, the first fixing portion is engaged with a lower end portion of the groove before the circuit is cut off, and the second fixing portion is engaged with a lower end of the groove after the circuit is cut off. A circuit breaker for engaging a portion . Circuit breaker of claim 1 Symbol mounting, characterized in that a circuit return member for returning the heating portion after the circuit breaker to its original position before the circuit breaker. The circuit breaker according to claim 2 , wherein the circuit return member is a member that presses the heating unit through a through hole formed in the upper case to return the heating unit to the original position. The melting member has circuit according to any one of claims 1 to 3, characterized in that a resin member for preventing the pressing force to the heating unit by the formed outside the container and the elastic member Shut-off device.

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