Interlock mechanism with fuse function

Abstract

The present application provides a kind of interlocking mechanism with fuse function capable of miniaturization without using large fuse and capable of recycling.The interlocking mechanism is composed of male interlocking terminal and female interlocking terminal, and is arranged at a position where the temperature rises due to heat generated from an electrical connector.The male interlocking terminal has a door-shaped terminal member, a fixed member with both ends fixed, and a fuse pin that elongates with temperature rise.The front end of the door-shaped terminal member penetrates the fixed member and can contact or separate from the front end of the female interlocking terminal.The fuse pin is located inside the door of the door-shaped terminal member, with one end supported by the upper surface of the fixed member and the other end abutting against the inner surface of the upper part of the door-shaped terminal member.The linear expansion coefficient of the fuse pin is set to be greater than that of the door-shaped terminal member.

Description

Technical Field

[0001] This invention relates to an interlocking mechanism with a fuse function. Background Technology

[0002] Hybrid vehicles or electric vehicles have a DC power supply, an inverter, and a motor driven by the inverter. They are vehicles that obtain power by converting the DC voltage from the DC power supply into AC voltage through the inverter, and then using the converted AC voltage to rotate the motor.

[0003] In EV systems of hybrid or electric vehicles, due to the relatively large current flowing in the internal units or wiring, electrical connectors with fuses are sometimes used to ensure safety or prevent damage to components. The fuse is located inside the connector or in the unit terminal block, but with the increasing power (high current) requirements in recent years, fuses have become larger, and connectors or unit terminal blocks are also trending towards larger sizes.

[0004] Therefore, Patent Document 1 discloses an electrical connector with a fuse function that does not use a large fuse. Specifically, this connector comprises connector terminals for current flow, interlocking terminals for detecting connection between the connector terminals, and a housing for holding the connector terminals and the interlocking terminals. The melting point of the housing material is set higher than that of the interlocking terminal material. The temperature rise caused by the heat generated when current flows through the connector terminals is transmitted to the interlocking terminals via the housing. When this temperature reaches a predetermined temperature above the melting point of the interlocking terminals, the interlocking terminals melt, thereby stopping the power supply to the connector terminals.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-047539 Summary of the Invention

[0006] The electrical connector described in Patent Document 1 can function as a fuse without using a large fuse, and its size can be miniaturized. However, if the interlocking terminal blows, heat is generated in the narrow, tightly sealed space, which may cause thermal damage to surrounding components. Furthermore, once the interlocking terminal blows, its function cannot be restored, and the entire electrical connector needs to be replaced.

[0007] This invention was made in view of the above-mentioned technical problems. The purpose of this invention is to provide an interlocking mechanism with fuse function that can reduce the size of the connector without using a large fuse and can repeatedly utilize the fuse function.

[0008] To achieve the above objectives, the present invention provides an interlocking mechanism for detecting whether an electrical connector is electrically connected. A male interlocking terminal and a female interlocking terminal are positioned at a temperature rise due to heat generated from the electrical connector. The male interlocking terminal includes a terminal component, a fixing component whose two ends are fixed by a housing, and a circuit-breaking component that elongates due to temperature rise. The front end of the terminal component can contact or separate from the female interlocking terminal. The circuit-breaking component is located inside the terminal component, with one end supported by the fixing component and the other end abutting against the terminal component. The coefficient of linear expansion of the circuit-breaking component is set to be greater than the coefficient of linear expansion of the terminal component.

[0009] Invention Effects

[0010] The interlocking mechanism with fuse function of the present invention comprises a terminal component, a fixing component, and a circuit-breaking component. The terminal component is movable vertically, and its front end contacts or separates from the female interlocking terminal. On the other hand, a circuit-breaking component is disposed inside the terminal component. One end (lower end) of the circuit-breaking component is supported by a fixing component fixed to the housing, and the other end (upper end) abuts against the terminal component. Thus, initially, the front end of the terminal component is positioned in contact with the front end of the female interlocking terminal. Furthermore, the coefficient of linear expansion of the material of the circuit-breaking component is set to be greater than that of the material of the terminal component. Therefore, when the temperature rises, the elongation of the circuit-breaking component is greater than that of the terminal component, generating a force between the fixing component and the terminal component due to the elongation of the circuit-breaking component. This force caused by elongation is supported and fixed at one end of the circuit-breaking component by the fixing component, and thus acts on the abutting portion at the other end, resulting in a force that pushes the terminal component upward.

[0011] According to the above structure, if an overcurrent flows through the electrical connector, its heat is transferred to the terminal components or the circuit breaker components, causing their temperature to rise. If the temperature of these components rises, the elongation of the circuit breaker components exceeds the elongation of the terminal components, thus pushing the terminal components upwards. As a result, the front end of the terminal component separates from the front end of the female interlocking terminal, cutting off the power supply. Upon receiving this signal, the power supply to the electrical connector is stopped. In this way, the overcurrent can be cut off, and the fuse function is activated. Afterwards, if the temperature drops, the circuit breaker components also retract, allowing the front end of the terminal component to re-contact the female interlocking terminal, restoring the original energized state.

[0012] As described above, according to the present invention, it is possible to provide an interlocking mechanism with fuse function that enables the miniaturization of electrical connectors and allows repeated use of fuse function without using a fuse. Attached Figure Description

[0013] Figure 1 This is a block diagram illustrating an example of an EV system using electrical connectors.

[0014] Figure 2 This invention relates to an interlocking mechanism with a fuse function. Figure 2 (a) is a schematic diagram showing the closed state of the interlocking mechanism. Figure 2 (b) is a schematic diagram showing the open state of the interlocking mechanism.

[0015] Figure 3 This is a perspective view showing an embodiment of the electrical connector.

[0016] Figure 4 This is an interlocking mechanism with a fuse function according to another embodiment of the present invention, indicating the engaged state of the fixing component and the circuit breaking component. Figure 4 (a) is a schematic diagram representing the engaged state. Figure 4 (b) is a schematic diagram showing the state of disengagement.

[0017] Figure 5 This is a schematic diagram showing the closed state of the interlocking mechanism, which is an interlocking mechanism with a fuse function according to another embodiment of the present invention. Detailed Implementation

[0018] Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or equivalent parts are referred to by the same reference numerals, and repeated descriptions are omitted. Furthermore, the embodiments described below are merely examples of how to implement the present invention and are not intended to limit the invention.

[0019] Figure 1 This is a block diagram illustrating an example of an EV system using electrical connector 2. In this embodiment, the example described is the use of electrical connector 2, which consists of a male connector 30 and a female connector 40, for connecting the inverter 52 to the high-voltage battery 51. Alternatively, electrical connector 2 can be used, for example, for connecting the inverter 52 to an electric motor 53. Furthermore, in this invention, all connectors used for electrical connections, including both low-voltage and high-voltage connectors, are collectively referred to as electrical connectors.

[0020] The following section will describe the overview of the EV system and the structure of the electrical connectors, followed by an explanation of the interlocking mechanism.

[0021] Here, the electric motor 53 is configured as a synchronous generator-motor that functions as both a motor that converts supplied electrical power into mechanical power and a generator that converts input mechanical power into electrical power. That is, the electric motor 53 (hereinafter also referred to as "motor / generator") operates as a motor that generates driving torque when the vehicle is driven, and operates as a generator during regeneration.

[0022] In the high-voltage battery 51, battery cells are connected in series, for example, from tens to more than one hundred, to form a high-voltage battery of tens to hundreds of volts. Lithium-ion batteries are preferably used as battery cells. However, rechargeable batteries such as nickel-cadmium batteries can also be used instead of lithium-ion batteries.

[0023] The drive of the electric motor / generator 53 is comprehensively controlled by the Electric Vehicle-Control Unit (EV-CU) 50. The EV-CU 50 calculates and outputs the torque command value of the electric motor / generator 53 based on driving conditions such as the accelerator pedal opening and vehicle speed, as well as the charging state of the high-voltage battery 51. Here, the interlocking mechanism 1 (the interlocking mechanism of the present invention) is connected to the EV-CU 50 via the interlocking line 20a, which detects the engagement state (electrical connection state) of the male connector 30 and the female connector 40. The EV-CU 50 allows or stops the power supply from the high-voltage battery 51 to the inverter 52 based on the state (closed or open) of the interlocking mechanism 1.

[0024] Inverter 52 is electrically connected to motor / generator 53 via three-phase cable 40c. Inverter 52 converts the DC power from high-voltage battery 51 into three-phase AC power according to the torque command value and supplies it to the motor. Generator 53, thereby driving the motor Generator 53. On the other hand, inverter 52, during regeneration, etc., converts the AC voltage generated by motor / generator 53 into DC voltage to charge high-voltage battery 51.

[0025] In the electrical connector 2, the male connector 30 is configured by mounting a pair of male connector terminals 31 within the male connector housing 32. A cable 40b, connected to the inverter 52, is electrically connected to each of the male connector terminals 31. Furthermore, within the male connector housing 32, the male interlocking terminal 10 (described later) is mounted close to the male connector terminals 31. The male connector housing 32 holds the male connector terminals 31 and the male interlocking terminal 10, and is positioned close to them in a manner that facilitates heat transfer between the male connector terminals 31 and the male interlocking terminal 10. It is made of a material with a high melting point and high thermal conductivity. More specifically, epoxy resin-based materials (e.g., materials incorporating inorganic fillers with excellent thermal conductivity into a thermosetting polyimide / epoxy resin) that combine high electrical insulation, high thermal conductivity, and high heat resistance are preferably used.

[0026] In electrical connector 2, the female connector 40 is configured by mounting a pair of female connector terminals 41 within a female connector housing 42. Each of the female connector terminals 41 is electrically connected to a cable 40a that connects to the high-voltage battery 51. Furthermore, within the female connector housing 42, the female interlocking terminal 20 (described later) is mounted close to the female connector terminals 41. The female connector housing 42 is preferably made of a material with a high melting point and high thermal conductivity, similar to the male connector housing 32. The specific material can be the same as that used for the male connector housing 32; since the female connector 40 is mounted within the housing of the high-voltage battery 51, the material can be selected based on the housing.

[0027] Thus, the male connector 30 and the female connector 40 are configured to be electrically connected. Typically, the male connector terminal 31 and the female connector terminal 41 are configured to mate. Simultaneously, the male interlock terminal 10 and the female interlock terminal 20 are configured to be electrically connected. While the specific connection structure will be described later, it can also be a typical mating connection based on a tongue-and-groove joint. In short, if the male connector terminal 31 is connected to the female connector terminal 41, then the male interlock terminal 10 and the female interlock terminal 20 are also connected, and their respective terminals are electrically connected. As a result, the high-voltage battery 51 is electrically connected to the inverter 52 via the electrical connector 2, and the interlocking mechanism 1 is connected. The interlocking mechanism 1 is used to detect whether the electrical connector 2 is electrically connected. If the EV-CU 50 detects that the interlocking mechanism 1 is connected (the interlocking circuit is in a closed state), then the electrical connector 2 is allowed to be energized. On the other hand, if the EV-CU50 detects that the connection of the interlocking mechanism 1 is opened (the interlocking circuit becomes open), then the power supply to the electrical connector 2 is prohibited, and the power supply from the high-voltage battery 51 to the inverter 52 is stopped.

[0028] Next, refer to Figure 1 Use Figure 2 The interlocking mechanism of the present invention will be described. Figure 2 It is an interlocking mechanism with a fuse function. Figure 2 (a) is a schematic diagram showing the closed state of the interlocking mechanism. Figure 2 (b) is a schematic diagram showing the open state of the interlocking mechanism.

[0029] In the figure, the interlocking mechanism 1 consists of a male interlocking terminal 10 and a female interlocking terminal 20, and is positioned close to the aforementioned electrical connector. This is because, to reliably transfer the heat generated when an overcurrent flows through the electrical connector, the ambient temperature rises without delay, causing the temperature of the terminal components or circuit breaker pins to also rise.

[0030] The male interlocking terminal 10 consists of a terminal component (in this example, a gate-shaped terminal component, hereinafter referred to as a "gate-shaped terminal component") 11, a fixing component 12 fixed at both ends to a housing or the like, and a circuit-breaking component (in this example, a circuit-breaking pin is used, hereinafter referred to as a "circuit-breaking pin") 13 that extends due to temperature rise. Furthermore, the legs 114 (two legs) of the gate-shaped terminal component 11 pass through the holes 122 of the fixing component 12, and its front end 111 contacts the front end 201 of the female interlocking terminal 20. The gate-shaped terminal component 11 can move up and down relative to the fixing component 12, and its front end 111 can also contact and separate from the front end 201 of the female interlocking terminal 20. In addition, to enhance the contact force between the front end 111 of the gate-shaped terminal component 11 and the front end 201 of the female interlocking terminal 20, it is preferable to magnetize the front end, or to assemble a magnetic material and attract it using a magnet.

[0031] On the other hand, the circuit breaker pin 13 is erected on the inner side (inside) 14 of the door of the gate-shaped terminal component 11. One end (lower end) 131 of the circuit breaker pin 13 is placed on the upper surface 121 of the fixing member 12, and the other end (upper end) 132 is arranged to abut against the upper inner surface 112 of the gate-shaped terminal component 11. That is, since both ends of the fixing member 12 are fixed to the housing, one end of the circuit breaker pin 13 is supported by the fixing member 12, and the other end is positioned by abutting against the gate-shaped terminal component. Here, if the length of the circuit breaker pin 13 is extended, the force caused by the extension, since one end 131 of the circuit breaker pin 13 is supported and fixed by the upper surface 121 of the fixing member 12, its reaction force acts on the abutting portion of the inner surface 112 of the gate-shaped terminal component 11 on the other end side, and as a result, it acts as a force that pushes the gate-shaped terminal component 11 upward.

[0032] The circuit breaker pin 13 is made of a material that elongates further than other components such as the gate terminal component 11 or the fixing component 12 as the temperature rises. As mentioned above, a material that reliably transfers heat generated when an overcurrent flows and whose temperature rises immediately is preferred. Both the gate terminal component 11 and the circuit breaker pin 13 require conductivity, therefore metallic materials are used, but it is important to select a material whose coefficient of linear expansion αp of the circuit breaker pin 13 is at least greater than that of the gate terminal component 11. For example, consider a circuit breaker pin made of aluminum (23.5 × 10⁻⁶). -6 / ℃) or copper alloy (16.5~19.0×10 -6 Formed at / ℃), the gate-shaped terminal component is made of iron (11.7×10). -6 / ℃) or stainless steel (9.9~10.4×10 -6The materials used are not limited, but ferrite-based stainless steel (such as SUS430) is preferred because it is magnetic and has a low coefficient of linear expansion. Furthermore, the circuit breaker pin can be made of an elastic body such as a spring, and if it is a copper alloy, it is easy to process, making it a preferred material for the circuit breaker component. Moreover, the greater the difference Δα between the coefficients of linear expansion of the gate-shaped terminal component 11 and the circuit breaker pin 13, the better. A larger Δα means a greater elongation of the circuit breaker pin 13 relative to the elongation of the gate-shaped terminal component 11, which facilitates the separation of the front end 111 of the gate-shaped terminal component 11 from the front end 201 of the female interlocking terminal 20.

[0033] in addition, Figure 2 In (a), the front end 111 of the gate-shaped terminal component contacts the front end 201 of the female interlocking terminal, and the interlocking mechanism is in a closed state. Therefore, the EV-CU50 detects that the interlocking line 20a is in a closed state, allowing the electrical connector 2 to be energized.

[0034] With the above structure, if an overcurrent flows through the connector, its heat is transferred to the gate-shaped terminal component 11 or the breaker pin 13, causing the temperature to rise. If the temperature of these components rises, due to the difference in their coefficients of linear expansion (Δα), the elongation of the breaker pin 13 is greater than the elongation of the gate-shaped terminal component 11, resulting in an elongation of the breaker pin 13 by Δl. At this time, the force caused by the elongation pushes the gate-shaped terminal component 11 upwards, such as... Figure 2 As shown in (b), the front end 111 of the gate-shaped terminal component is separated from the front end 201 of the female interlocking terminal by a gap s. At this time, the interlocking mechanism is in the open state, and therefore the EV-CU50 detects that it is in the open state via the interlocking line 20a, and cuts off the power supply to the electrical connector 2.

[0035] Subsequently, if the temperature drops, the circuit breaker pins and the like will also retract, so the front end 111 of the gate-shaped terminal component 11 will once again contact the front end 201 of the female interlocking terminal 20. In this way, the EV-CU50 detects that the interlocking mechanism is in the closed state, allowing the electrical connector 2 to be energized and thus returning to the original energized state.

[0036] then, Figure 3 This is a perspective view showing an embodiment of the electrical connector.

[0037] In the diagram, identical or equivalent parts are marked with the same symbols, so their descriptions are omitted. However, as shown, the electrical connector 2 consists of a male connector 30 and a female connector 40, and the interlocking mechanism 1 with fuse function consists of a male interlocking terminal 10 and a female interlocking terminal 20, which are composed of a gate-shaped terminal component 11, a fixing component 12, and a circuit-breaking pin 13. In the male connector housing 32, a pair of male connector terminals 31 and adjacent male interlocking terminals 10 are arranged. On the other hand, in the female connector housing 42, a pair of female connector terminals 41 and adjacent female interlocking terminals 20 are arranged. Therefore, if the male connector terminals 31 and female connector terminals 41 are mated together, the male interlocking terminals 10 and female interlocking terminals 20 are in contact and electrically connected. Alternatively, as described above, the male interlocking terminals 10 and female interlocking terminals 20 can also be configured to be mated together.

[0038] Based on the above electrical connector, as described above, it is possible to reduce the size without using large fuses, and the fuse function can be reused repeatedly.

[0039] In the interlocking mechanism of the present invention, the linear expansion coefficients of the terminal components and the circuit breaker components can be determined based on the temperature rise caused by the heat generated when an overcurrent flows through the electrical connector, and their materials can be selected accordingly. For example, data on the heat generated (or desired to be generated) when an overcurrent flows through the male connector 30 and the female connector 40, and the temperature rise of the terminal components and the circuit breaker components due to this heat, and therefore the temperature difference ΔT between them at this time, are obtained in advance. Furthermore, the elongation Δl of the circuit breaker component is set based on the gap s required to separate the male interlocking terminal and the female interlocking terminal. Then, using the ΔT, Δl, and the length l of the circuit breaker component, α = Δl / l is calculated. The linear expansion coefficient αp of the circuit breaker component can be obtained by using the formula ΔT, and a material that meets this linear expansion coefficient αp can be selected.

[0040] Furthermore, by setting the resistance of the electrical connector based on the aforementioned heat generation, the heat generation (I²R) when an overcurrent I flows can also be adjusted (increased) by adjusting (increasing) the resistance R of the male and female connectors. For example, in order to increase the heat generation that is expected to be generated when an overcurrent flows through the male and female connectors, the resistance of the electrical connector can be set to be higher than usual.

[0041] Next, use Figure 4 Another embodiment of the present invention relates to an interlocking mechanism with a fuse function. Figure 4 This indicates the engagement state of the fixing component and the circuit breaker component (also used as a circuit breaker pin in this example). Figure 4 (a) is a schematic diagram representing the engaged state. Figure 4(b) is a schematic diagram showing the state of disengagement.

[0042] In this example, a recess 150 is formed in the upper part of the fixing member 15, and a recessed portion 151 is provided on the inner circumferential surface of the recess 150. On the other hand, a protrusion 161 is provided at one end 160 of the circuit breaker pin 16. The protrusion 161 can be formed to cover the entire circumference, or it can be a single one, or multiple ones can be provided intermittently. With this structure, if the end 160 of the circuit breaker pin 16 is fitted into the recess 150 of the fixing member 15, the protrusion 161 is embedded into the recess 151 and becomes engaged. In this engaged state, the circuit breaker pin 16 is stably positioned. Then, if an overcurrent flows through the electrical connector, as described above, the circuit breaker pin 16 extends, pushes the gate terminal member 11 upward, and the engagement between the protrusion 161 and the recess 151 disengages, creating a gap s, and the interlocking mechanism becomes open. Furthermore, in this state, in the engaging portion c, the protrusion 161 climbs over the recess 150 (including the recessed portion), thereby preventing the protrusion 161 from returning to the recessed portion 151. Afterwards, if the temperature drops, the circuit breaker pin also contracts, so the circuit breaker pin can be pressed in by hand to restore the contact state. In this way, the fuse function can be used repeatedly.

[0043] then, Figure 5 It also relates to another embodiment of the interlocking mechanism with a fuse function, and is a schematic diagram showing the closed state of the interlocking mechanism.

[0044] In this example, an elastic member, namely a spring member 17, is provided between the upper outer surface 113 of the aforementioned gate-shaped terminal component 11 and the housing such as the male connector housing 32 to press the gate-shaped terminal component 11 against the fixing member 12. According to this structure, the gate-shaped terminal component 11 is pressed downwards by the spring member 17, thereby reliably making contact between its front end 111 and the front end 201 of the female interlocking terminal 20. Then, if an overcurrent flows through the connector, as described above, the circuit breaker pin 16 extends, pushing the gate-shaped terminal component 11 upwards against the spring force, creating a gap s between the front end 111 and the front end 201, and the interlocking mechanism becomes open. Afterwards, if the temperature drops, the circuit breaker pin also contracts, and the spring force is applied to press the gate-shaped terminal component downwards, and the interlocking mechanism returns to the closed state.

[0045] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and can be implemented with appropriate modifications as needed. For example, the location where the interlocking mechanism with fuse function is applied is not limited to the above embodiments, and can also be set at a temperature transmission location such as a busbar or a heat-generating component exposed to high temperatures. In EV systems, it can be used for the connection between the inverter and the electric motor (motor / generator), and can also be used for the connection between other control units and cables.

[0046] Furthermore, a high thermal conductivity component with a higher thermal conductivity than the male or female connector housing can be additionally installed between the male connector terminal and the male interlock terminal. This allows for more efficient transfer of heat generated in the male connector terminal during overcurrent flow to the male interlock terminal.

[0047] Furthermore, in this embodiment, the interlocking mechanism with fuse function is provided on the male interlocking terminal side, but it can also be provided on the female interlocking terminal side. Moreover, the connection structure between the male and female interlocking terminals can be configured with their respective front ends forming a concave-convex shape for a typical mating structure, or it can be configured using magnetic force.

[0048] Furthermore, this embodiment uses an interlocking mechanism with a fuse function used in an EV system as an example for explanation, but the present invention can also be applied to other power systems that require interlocking mechanisms, such as electric vehicles or industrial machinery.

[0049] Symbol Explanation

[0050] 1-Interlocking mechanism with fuse function; 2-Electrical connector; 10-Male interlocking terminal; 11-Terminal component (gate-shaped terminal component); 111-Front end of gate-shaped terminal component; 112-Upper inner surface of gate-shaped terminal component; 113-Upper outer surface of gate-shaped terminal component; 114-Leg of gate-shaped terminal component; 12, 15-Fixing component; 121-Upper surface of fixing component; 122-Through hole of fixing component; 13, 16-Circuit breaking component (circuit breaking pin); 131-One end of circuit breaking pin; 132-The other end of circuit breaking pin; 14-Inner side of door (inside of door); 150-Recess of fixing component; 151-Recess of fixing component Recess, 160 - End of the circuit breaker pin, 161 - Protrusion of the circuit breaker pin, 17 - Spring component, 20 - Female interlock terminal, 201 - Front end of the female interlock terminal, 30 - Male connector, 31 - Male connector terminal, 32 - Male connector housing, 40 - Female connector, 41 - Female connector terminal, 42 - Female connector housing, 50 - EV-CU, 51 - High-voltage battery, 52 - Inverter, 53 - Electric motor (electric motor / generator).

Claims

1. An interlocking mechanism with a fuse function for detecting whether an electrical connector is electrically connected, characterized in that, The male and female interlocking terminals are positioned where their temperature rises due to heat generated from the electrical connector. The male interlocking terminal includes a terminal component, a fixing component whose two ends are fixed by a housing, and a circuit-breaking component that elongates upon temperature rise. The front end of the terminal component can contact or separate from the female interlocking terminal. The circuit breaker component is located inside the terminal component, with one end supported by the fixing component and the other end abutting against the terminal component. The coefficient of linear expansion of the circuit breaker component is set to be greater than that of the terminal component.

2. The interlocking mechanism with fuse function according to claim 1, characterized in that, A recess is formed in the upper part of the fixing component, and a recessed portion is provided on the inner circumferential surface of the recess. On the other hand, a protrusion is provided on the outer surface of one end of the circuit breaker component. By fitting one end of the circuit breaker component into the recess of the fixing component, the recessed portion and the protrusion are engaged. When the length of the circuit breaker component extends, the engagement between the recessed portion and the protrusion is disengaged, and the protrusion climbs over the recess, thereby preventing the protrusion from returning to the recessed portion.

3. The interlocking mechanism with fuse function according to claim 1 or 2, characterized in that, An elastic member is provided between the upper outer surface of the terminal component and the housing to press the terminal component against the side of the fixed component.

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