JP2017183243A - Terminal temperature display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal temperature display device capable of accurately detecting abnormal overheat of terminal block by simple configuration, without modifying a circuit breaker.SOLUTION: A terminal temperature display device 2 attached to the terminal 12 of a circuit breaker 1 and displaying the temperature of the terminal includes a connection connected to the terminal and having heat of the terminal conducted thereto, a thermal element having one end fixed to the connection, and the other end disposed to displace freely in response to change of heat, a displacement transmission part to which displacement of thermal element is transmitted, and which reciprocates corresponding to response, and a display mechanism which is driven by displacement transmitted from the displacement transmission part.SELECTED DRAWING: Figure 1

Description

The present invention detects the temperature of the terminal portion of the circuit breaker and prevents the connected wires and circuit breaker from being burned out and spreading to construction materials and peripheral devices around the circuit breaker. The present invention relates to an intended terminal temperature display device.

The circuit breaker detects an accident current such as an overcurrent, a short-circuit current, or a leakage current in the electric circuit, and performs a cut-off operation so as to cut off the supply of power to the load side when a predetermined operating condition is met.

The circuit breaker is provided with a terminal plate at the terminal portion of each pole in order to make an electrical connection with an electric wire or a load device. Circuit breakers built in switchboards such as residential distribution boards and control panels are drawn in at the construction site, the wires are crimped with crimp terminals, and the crimp terminals are connected to the circuit breaker by terminal screws. Connected to the terminal board by screw tightening. At this time, if the screw connection between the crimp terminal and the terminal board of the circuit breaker is insufficient, abnormal overheating may occur in the terminal board during use of the circuit breaker.

In addition, even during use for many years, the terminal screw attached to the terminal board may loosen due to repeated expansion and contraction due to ambient vibrations and temperature changes. If the terminal screw is not tightened, abnormal overheating may occur due to loosening of the screw.

Abnormal overheating of the terminal plate occurs when the contact resistance between the crimp terminal to which the electric wire is attached and the terminal plate increases due to the loosening of the terminal screw, and a large Joule heat is generated.

In addition, abnormal overheating also occurs due to an increase in contact resistance due to oxidation of the contact surface between the crimp terminal of the wire and the terminal plate of the circuit breaker, or an increase in contact resistance due to foreign matter being caught.

If such an abnormal overheating state continues, parts constituting the circuit breaker and connected electric wires may ignite, and there is a concern about the spread of fire to construction materials and peripheral devices around the circuit breaker.

However, ordinary circuit breakers do not have the function of detecting abnormal overheating of these terminal boards. In order to prevent abnormal overheating of the terminal board, measures are generally taken to confirm connection during construction and to perform periodic maintenance inspections (such as tightening terminal screws). Although these preventive measures are effective in preventing abnormal overheating, it is impossible to notice abnormal overheating until the next maintenance inspection. Can not.

Therefore, a circuit with an overheat prevention device with a function to prevent burning accidents due to abnormal overheating by detecting abnormal overheating of the terminal board and shutting off the power supply to the load side when abnormal overheating occurs A circuit breaker is disclosed. (Patent Document 1, Patent Document 2)

In patent document 1, the following is disclosed as what detects abnormal overheating. Bimetal plates 25 and 26 for overheat detection are fixed to the power supply side terminal and the load side terminal of the circuit breaker, and a transmission plate that is displaced following the displacement of the bimetal plate is suspended between the two bimetal plates. In addition, the operation rod that is normally locked to the transmission plate is moved by tripping the circuit breaker by releasing the locking relationship with the transmission plate due to the displacement of the transmission plate when overheated. It is to be prepared. In addition, when the engagement relationship between the transmission plate and the actuating rod is released and the actuating rod is operated, the operation rod is projected outside the circuit breaker to display the operation and press the actuating rod. Thus, an overheat prevention device that enables resetting of the circuit breaker is added to a general circuit breaker.

In patent document 2, it was made in view of the mechanical structure in the above-mentioned patent document 1, and abnormal overheating is detected electrically, and it is interrupted by an electrical signal output when the abnormal overheating is detected. What drives a tripping device that opens the contact of the container is disclosed.

Specifically, the mechanical operation disclosed in Patent Document 1 is made in view of the fact that it cannot be applied unless the internal mechanism of the circuit breaker is changed. In addition, the circuit breaker in the power supply system can be centrally managed, and can be used for overheating protection of other devices such as an electromagnetic switch provided in the same circuit.

As a configuration for detecting abnormal overheating, a temperature-sensitive element whose electrical output changes corresponding to the temperature of the wire connection terminal, and detecting the abnormal overheating by comparing the electrical output of the temperature-sensitive element with a normal level And a determination circuit.

Examples of the temperature sensing element include a thermistor, a thermocouple using a thermoelectromotive force, an infrared sensor for detecting radiant heat, and the temperature sensing element is arranged near the terminal of the mold case as an arrangement form of the temperature sensing element. The temperature sensor unit is configured to be embedded and disposed on a resin-molded insulating support independent of the mold case, and the temperature sensor unit is integrated using the mounting groove of the interelectrode barrier. A form attached to the mold case, a form in which the temperature sensor unit is formed in a plate shape so that it can be mounted between the back surface of the mold case and the board surface, a terminal used to insulate the circuit breaker terminal part The temperature sensor is embedded in an insulator, such as a ceramic with high thermal conductivity, attached to the cover, inserted into a hole provided in the insulation support of the temperature sensor unit, and long by a spring. Resiliently held so as to be movable in a direction, such as in the form of contacting the distal end of the insulator is disclosed in breaker terminals.

Japanese Utility Model Publication No. 56-25156 JP 62-8419 A

As disclosed in Patent Document 1 and Patent Document 2, it is possible to add a function of detecting abnormal overheating of the terminal board to a normal circuit breaker. However, in Patent Document 1, it is necessary to provide a space for arranging a mechanical mechanism for detecting abnormal overheating on the entire back surface side of the circuit breaker when adding a function for detecting abnormal overheating. Since the circuit breaker is greatly modified, such as the external shape of the circuit breaker is greatly changed, there is a problem of increase in man-hours and cost.

In addition, in Patent Document 2, it is necessary to separately provide a unit including a temperature sensor such as a temperature sensing element and a determination circuit and to attach the unit to a circuit breaker when arranging an electrical device. Because there are many parts, and it is necessary to introduce it as a temperature measurement system, it is complicated to add functions. Further, since the temperature sensitive element is mounted after being electrically insulated from the main circuit, there is a problem that the temperature sensing becomes indirect and it is difficult to catch an accurate temperature rise.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a terminal temperature display device that can detect abnormal overheating of a terminal plate with a simple configuration without requiring modification of a circuit breaker. To do.

A terminal temperature display device according to the present invention is configured to solve the above-described problems, and is a terminal temperature display device that is attached to a terminal of a circuit breaker and displays the temperature of the terminal, and is connected to the terminal. A connection part through which the heat of the terminal is conducted, a thermal element having one end fixed to the connection part and the other end arranged to be displaceable in response to the change in heat, and the thermal A terminal temperature display device comprising: a displacement transmission unit that transmits a displacement of an element and reciprocates in response to a response; and a display mechanism that is driven by the displacement of the displacement transmission unit being transmitted. It is a thing.

According to such a configuration, it is possible to detect abnormal overheating of the terminal with a simple configuration without the need to modify the circuit breaker.

Further, the connecting portion where the thermal element is disposed is disposed corresponding to the number of terminals of the circuit breaker, while the displacement transmitting portion is provided in common to each thermal element. The maximum displacement in each thermal element may be transmitted.

According to such a configuration, a plurality of terminals can be collectively monitored with a small number of parts.

The display mechanism includes a first display mechanism that is driven to transmit a displacement in one direction among the reciprocating displacements in the displacement transmitting unit, and a displacement in both directions of the reciprocating displacement. It is good also as a structure provided with at least one display mechanism of the 2nd display mechanism driven following.

According to such a configuration, at least one of the current heat generation state of the terminal and the maximum heat generation state of the terminal can be displayed.

In addition, a part of the connection part is exposed to the outside, and includes a substantially rectangular parallelepiped housing that houses the thermal element, the displacement transmission part, and the display mechanism, and a visual recognition part that visually recognizes the display mechanism from the outside. It is good also as a structure by which one surface of a housing | casing is arrange | positioned facing a circuit breaker.

According to this configuration, it is possible to provide a terminal temperature display device that can prevent the thermodynamic element and the display mechanism from being operated from the outside and can visually recognize the display mechanism from the outside.

Further, the reset operation unit for resetting the first display mechanism in a state where the maximum displacement of the displacement transmission unit is maintained may be provided on one surface arranged to face the circuit breaker in the housing. Good.

With this configuration, the first display mechanism cannot be reset when the terminal temperature display device is attached to the circuit breaker, and the first display mechanism can be reset when the terminal temperature display device is removed from the circuit breaker. A terminal temperature display device can be provided.

As described above, according to the present invention, it is possible to provide a terminal temperature display device that can detect abnormal overheating of a terminal plate with a simple configuration without requiring modification of a circuit breaker.

The schematic of the state which attached the terminal temperature display apparatus which is embodiment of this invention to the circuit breaker is shown. The schematic of the attachment method of said terminal temperature display apparatus is shown. The terminal temperature display device is shown. The internal assembly drawing of said terminal temperature display apparatus is shown. Sectional drawing AA (structure of a heat_generation | fever display part) of the temperature display part of said terminal temperature display apparatus is shown. Sectional drawing BB (structure of a maximum heat display part) of the temperature display part of said terminal temperature display apparatus is shown. The perspective view of the internal assembly drawing of said terminal temperature display apparatus is shown. The structure which detects the connection failure of the terminal in a prior art example is shown.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, the schematic block diagram of the state which attached the terminal temperature display apparatus 2 which concerns on this embodiment to the circuit breaker 1 is shown. In FIG. 2, the schematic of the attachment method of a terminal temperature display apparatus is shown. FIG. 3 shows a terminal temperature display device. FIG. 4 shows an internal assembly diagram of the terminal temperature display device. FIG. 5 shows the structure of a constantly heating display unit that constantly displays the temperature of the terminal board of the terminal temperature display device. FIG. 6 shows the structure of the maximum heat generation display unit that displays the most heat generation temperature of the terminal board of the terminal temperature display device. In FIG. 7, the perspective view of the internal structure figure of a terminal temperature display apparatus is shown. FIG. 8 shows a structure for detecting a terminal connection failure in the conventional example.

First, the basic structure of the circuit breaker 1 shown in FIGS. 1 and 2 will be described. In FIG. 1 and FIG. 2, the circuit breaker 1 is comprised by the circuit breaker housing | casing whose outer shell consists of a mold case. The circuit breaker housing includes a base 101 for mounting the internal components of the circuit breaker and a cover 102 that covers the internal components and covers the base. In the circuit breaker 1, there are a fixed contact (not shown) integrated with the terminal 12 and a movable contact (not shown) in order to turn on and off the electric circuit on the power source side and the electric circuit on the load side. Is disposed. Also, an opening / closing mechanism (not shown) that opens and closes the fixed contact and the movable contact, and a tripping operation of the opening / closing mechanism by acting on the opening / closing mechanism by detecting an abnormal current flowing in the electric circuit. And a tripping device (not shown) for opening the stationary contact and the movable contact.

The circuit breaker 1 is provided with a plurality of terminals 12 connected to external conductors corresponding to the power sources of the respective poles, and each of them is exposed to the outside.

An electric wire 3 is connected to the terminal 12 from the outside. A crimp terminal 31 is attached to the tip of the electric wire 3 by caulking, and the crimp terminal 31 is fixed to the terminal 12 with a terminal screw 11.

Next, the terminal temperature display device 2 attached to the circuit breaker 1 will be described with reference to FIGS. 1 and 2. The heat conduction terminal plate 21 of the terminal temperature display device 2, which is a connection portion that is connected to the terminal 12 and conducts heat of the terminal 12, has a through hole that penetrates the terminal screw 11 of the circuit breaker 1. The heat conducting terminal plate 21 is fastened and fixed by the terminal screw 11 so as to be sandwiched between the crimp terminal 31 and the terminal 12 of the electric wire 3. The terminal temperature display device 2 is located between the mounting surface of the circuit breaker 1, that is, the bottom surface of the circuit breaker 1 and the electric wire 3 connected to the terminal 12 at the time of mounting.

Next, the configuration of the terminal temperature display device 2 having a function of detecting abnormal overheating of the terminal 12 will be described with reference to FIGS. 3, 4, 5, and 6.

As shown in FIG. 3 and FIG. 4, the terminal temperature display device 2 is connected to the terminal 12 of each pole of the circuit breaker 1 and is a heat conduction terminal plate 21 that is a connection part through which heat of the terminal is conducted

A thermal element 22 fixed to the heat conduction terminal plate 21;

An operating body 23 that is a displacement transmitting portion that transmits the displacement of the thermal element 22 and reciprocates in response to the response;

A display unit 24 that is a display mechanism that is driven by the displacement of the operating body 23 being transmitted;

A housing 25 that houses the thermal element 22, the operating body 23, and the display unit 24;

It is configured with.

The thermal element 22 fixed to the heat conduction terminal plate 21 is configured using a bimetal that receives heat conduction from the heat conduction terminal plate 21 connected to the terminal 12 and quantitatively displaces. In FIG. 4, the thermal element 22 is fixed to the heat conducting terminal plate 21 by screw tightening, but is not limited to screw tightening and may be fixed by welding or rivets.

As shown in FIGS. 5 and 6, the display unit 24 is an operating body that rotates in the B direction in response to the displacement of the thermal element 22 when the thermal element 22 is displaced by heat conduction from the thermal conduction terminal plate 21. 23 moves to the circuit breaker 1 side, that is, to the left in FIGS. Since the amount of movement of the display unit 24 also changes according to the magnitude of the displacement of the thermal element 22, the magnitude of the displacement of the thermal element 22, that is, the amount of heat generated at the terminal 12 can be visually recognized by viewing the amount of movement. be able to.

The heat generated at the terminal 12 is conducted through the heat conducting terminal plate 21, and the thermal element 22 is quantitatively displaced according to the amount of heat. Since the display unit 24 moves via the operating body 23 in accordance with the displacement amount, the amount of heat generated at the terminal 12, the amount of displacement of the thermal element 22 and the amount of movement of the display unit 24 are correlated, and the terminal 12 The heat generation state can be displayed.

With such a configuration, the terminal temperature display device 2 of the terminal temperature display device 2 is attached to the terminal 12 of the existing circuit breaker with the terminal screw 11 so that the terminal breaker 1 is not required to be modified. The device 2 can be attached. Further, the amount of heat generated by the terminal 12 can be visually observed by the amount of movement of the display unit 24 that moves in conjunction with the displacement of the thermal element 22 fixed to the heat conducting terminal plate 21, thereby generating heat of the terminal 12 with a simple configuration. The status can be displayed.

4, 5, and 6, the display unit 24 is configured to move via the operating body 23. However, the display unit 24 is not limited to this, and for example, the display unit 24 moves directly in contact with the thermal element 22. It is good also as composition to do. Further, the moving direction of the display unit 24 is not limited to the circuit breaker 1 side, that is, the left direction in FIGS. 5 and 6. For example, the display unit 24 moves away from the circuit breaker 1, that is, the right side in FIGS. 5 and 6. Also good.

Next, a terminal temperature display device 2 that can monitor a plurality of terminals 12 and display necessary information will be described with reference to FIGS. 4, 5, and 6. The actuating body 23 shown in FIG. 4 is fixed to the housing 25 so as to be rotatable over the terminals 12 of each pole.

With such a configuration, the thermal element that is displaced at the highest temperature among the plurality of thermal elements 22 fixed to the heat conduction terminal plate 21 attached to the terminal 12 of the pole across which the operating body 23 extends. The display unit 24 can be moved by rotating the operating body 23 in only the direction 22 in the direction B shown in FIGS. Therefore, it is possible to monitor the heat generation state of the plurality of terminals 12 over which the operating body 23 extends, and to display only the heat generation state of the terminal 12 that generates the most heat. Therefore, it is possible to display the heat generation state of the terminal 12 that generates the most heat, which is information necessary for detecting abnormal heat generation of the terminal 12 with a smaller number of parts than arranging the terminal temperature display device 2 for each terminal 12. .

Next, the terminal temperature display device 2 capable of displaying a more detailed heat generation state of the terminal 12 will be described with reference to FIGS. 4, 5 and 6. In FIG. 4, the display unit 24 is a constant heat generation display unit 241 that is a second display mechanism that is driven following the displacement in both directions of the reciprocating displacement of the operating body 23, and one direction of the reciprocating displacement of the operating body 23. The displacement can be transmitted and driven, and a maximum heat generation display unit 242 which is a first display mechanism that holds the maximum displacement of the displacement transmission unit can be configured. The constant heat generation display unit 241 displays the current heat generation state of the terminal 12, and the maximum heat generation display unit 242 maintains the display of the maximum heat generation state of the terminal 12.

In FIG. 5, the constantly heating display portion 241 is incorporated in the housing 25 together with the always heating display spring 26. One end of the constantly heating display spring 26 is fixed to the housing 25, and the constantly heating display section 241 biases the operating body 23 to rotate in the A direction. The operating body 23 is always fixed by being rotated in the A direction by the heat generation display unit 241 and coming into contact with the position regulating unit 251 of the housing 25, and is provided with a certain gap from the thermal element 22.

When the terminal 12 generates heat, the thermal element 22 fixed to the heat conducting terminal plate 21 is displaced, and the operating body 23 is rotated in the B direction. The circuit breaker 1 moves to the left side of FIG. Further, when the heat generation at the terminal 12 is cured, the displacement of the thermal element 22 is reduced, and the operating body 23 is kept in the position A until the position restricting portion 251 of the housing 25 and the operating body 23 come into contact with each other by the heat generating display spring 26. By rotating in the direction, the constantly heating display portion 241 moves to the opposite side of the circuit breaker 1, that is, to the right in FIG.

In FIG. 6, the maximum heat generation display portion 242 that maintains the display of the maximum heat generation state of the terminal 12 is incorporated in the housing 25 together with the maximum heat generation display leaf spring 27, and some ribs provided on the maximum heat generation display portion 242 are maximum. The heat generating plate spring 27 is sandwiched with a constant load.

When the terminal 12 generates heat, the thermal element 22 fixed to the heat conducting terminal plate 21 is displaced, and the operating body 23 is rotated in the B direction, so that the maximum heat generation display portion 242 is fixed to the maximum heat generation display plate spring 27. The circuit breaker 1 moves against the pinching load, that is, moves to the left in FIG.

Further, when the heat generation at the terminal 12 is subsided, the displacement of the thermal element 22 is reduced, and the operating body 23 is moved to the position A until the position restricting portion 251 of the housing 25 and the operating body 23 come into contact with each other by the heat generating display spring 26. The maximum heat generation display portion 242 is held at a moved position and does not move to the initial position because the maximum heat generation display portion 242 is sandwiched between the maximum heat generation display leaf springs 27 with a constant load.

With such a configuration, with respect to the heat generation state of the terminal 12, the current heat generation state and the state when the heat generation is the most over the past and the present can be displayed, and the heat generation state of the terminal 12 can be confirmed in more detail. . In the invention of the present application, the display unit 24 may be provided with the always heat generation display unit 241, the maximum heat generation display unit 242 only, or both, but the terminal 12. In order to detect the presence or absence of abnormal heat generation, it is preferable that at least the maximum heat generation display unit 242 be provided.

Next, the terminal temperature display device 2 that can prevent an operation from the outside of the display unit 24 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 4, the housing 25 has the thermal base 22 and the display unit 24 accommodated in the housing base portion 2501, and then a housing lid portion 2502 as shown in FIG. The moving element 22 and the display unit 24 are configured to be inaccessible from the outside.

The housing base 2501 is provided with a heat generation display plate 2521 for preventing an operation from the outside of the display unit 24 and for visually recognizing the heat generation state of the terminal 12 according to the movement amount of the display unit 24. The part 2502 is provided with a window frame 2522 that is a visual recognition part for visually recognizing the display part 24 and the heat generation display plate 2521 from the outside, and is configured so that the heat generation state of the terminal 12 can be easily visually recognized. For example, a part of the surface of the display unit 24 that can be seen from the window frame 2522 is different in color, the heat generation display plate 2521 is transparent, and the character indicating the temperature of the terminal 12 is written at a position corresponding to the amount of movement of the display unit 24. For example, when the display unit 24 moves, the surface of the display unit 24 having a different color appears through the heat generation display plate 2521 according to the amount of movement, so that the temperature of the terminal 12 can be confirmed from the window frame 2522.

With such a configuration, since the thermal element 22 and the display unit 24 cannot be contacted from the outside, the display unit 24 is not moved by an intentional operation other than the thermal element 22, and the heat generation state of the terminal 12 Can be displayed accurately. In addition, since the window frame 2522 for visually recognizing the display unit 24 is provided on the housing cover 2502, the display on the display unit 24 can be visually recognized even when the display unit 24 is housed in the housing 25.

Next, while the terminal temperature display device 2 is in use, the display of the maximum heat generation display unit 242 cannot be reset. If the terminal temperature display device 2 is removed from the circuit breaker 1, the display of the maximum heat generation display unit 242 can be reset. The device 2 will be described with reference to FIG.

As shown in FIG. 7, the chassis base 2501 is provided with a reset release port 253 that can return the position of the maximum heat generation display 242 to the initial state on the surface of the terminal temperature display device 2 on the circuit breaker 1 side. .

By providing a reset release port on the surface of the housing base 2501 that cannot be operated by external contact when the heat conduction terminal plate 21 is attached to the terminal 12, the terminal temperature device 2 is provided. The maximum temperature display unit 242 cannot be reset when connected to the circuit breaker 1.

When the maximum heat generation display unit 242 is in a display state indicating abnormal overheating of the terminal 12 due to loose screws, the terminal temperature display device 2 is removed from the circuit breaker 1, and a rod is inserted into the reset release port 253 to generate maximum heat. By performing operations such as pushing in the display unit 242, the position of the maximum heat generation display unit 242 is reset to the initial position, and after that, the circuit breaker 1 is securely screwed and the terminal temperature display device 2 is attached, Abnormal overheating of the terminal 12 due to the looseness of the terminal screw 11 can be prevented, and the maximum heat generation display portion 242 of the terminal temperature display device 2 can be used again.

With such a configuration, while the terminal temperature display device 2 is being used, the display of the maximum heat generation display unit 242 can be maintained without being reset, so that abnormal overheating of the terminal 12 can be reliably displayed. If the terminal temperature display device 2 is removed, the display of the maximum heat generation display unit 242 can be reset, so that the maximum heat generation display unit 242 of the terminal temperature display device 2 can be used again.

In FIG. 7, the reset release port 253 is disposed at a position facing the circuit breaker 1. However, the present invention is not limited to this. For example, the reset release port 253 is a slide switch, and the terminal temperature display device 2 The maximum heat generation display unit 242 may be reset to the initial position by sliding the slide switch on the bottom surface.

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

For example, although the display unit 24 is moved in the horizontal direction, the surface of the display unit 24 may be moved by rotating together with the operating body in conjunction with the displacement of the thermal element 22 around the operating body. Good.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 11 Terminal screw 12 Terminal 2 Terminal temperature display apparatus 21 Thermal conduction terminal board 22 Thermal element 23 Actuator 24 Display part 241 Normal heat generation display part 242 Maximum heat generation display part 25 Case 2501 Case base part 2502 Case Body cover part 251 Position restricting part 2521 Heat generation display plate 2522 Window frame 253 Reset release port 26 Constant heat generation display spring 27 Maximum heat generation display plate spring 3 Electric wire 31 Crimp terminal

Claims (5)

A terminal temperature display device that is attached to a terminal of a circuit breaker and displays the temperature of the terminal,
A connecting portion connected to the terminal and conducting heat of the terminal;
A thermal element having one end fixed to the connection portion and the other end arranged to be displaceable in response to the change in heat;
A displacement transmitting portion that transmits the displacement of the thermal element and reciprocates in response to the response;
A terminal temperature display device comprising: a display mechanism that is driven by transmission of a displacement of the displacement transmitter.
While the connection portion where the thermal element is disposed is disposed corresponding to the number of the terminals of the circuit breaker,
By providing the displacement transmission part in common to each of the thermal elements,
The terminal temperature display device according to claim 1, wherein a maximum displacement in each of the thermal elements is transmitted.
The display mechanism is
A first display mechanism in which displacement in one direction among the reciprocating displacements in the displacement transmission unit is transmitted and driven, and the maximum displacement of the displacement transmission unit is maintained;
Of the second display mechanism driven following the displacement in both directions of the reciprocating displacement,
The terminal temperature display device according to claim 1, wherein at least one of the display mechanisms is provided.
A part of the connection portion is exposed to the outside, and includes a substantially rectangular parallelepiped housing that houses the thermal element, the displacement transmission portion, and the display mechanism, and the display mechanism is visually recognized from the outside. It has a visual recognition part,
4. The terminal temperature display device according to claim 1, wherein one surface of the housing is disposed to face the circuit breaker. 5.
A reset operation unit that resets the first display mechanism in a state where the maximum displacement of the displacement transmission unit is held is provided on one surface of the housing that is disposed to face the circuit breaker. The terminal temperature display device according to claim 3 or 4.

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