DE102018119859B3 - Electrical connection device with temperature safety device and method for operating such a device - Google Patents

Abstract

The invention relates to an electrical connection device (1) with a temperature protection device and a method for operating such a device (1), the device (1) for establishing an electrically conductive connection of a first conductor section and a second conductor section and for safety-critical disconnection in the event of a fire is provided and comprises the following: a first connection contact device (8) for contacting the first conductor section, a second connection contact device (18) for contacting the second conductor section and a temperature assurance device connecting the first connection contact device (8) and the second connection contact device (18) to one another in an electrically conductive manner, characterized in that the temperature assurance device has at least two temperature assurance elements connected in series in the form of a first temperature assurance element (27) and a second temperature assurance element ent (28), the first temperature securing element (27) being such that it reliably interrupts the electrical connection between the first connection contact device (8) and the second connection contact device (18, 19) in a response temperature range from T1 to T3 and the second Thermal fuse element (28) is designed such that it reliably interrupts the electrical connection between the first connection contact device (8) and the second connection contact device (18, 19) in a response temperature range from T2 to T5, T1 <T2 <T3 <T5.

Description

The present invention relates to a device for creating an electrically conductive connection of a first conductor section and a second conductor section and for safety-critical disconnection in the event of a fire, comprising a first connection contact device for contacting the first conductor section, a second connection contact device for contacting the second conductor section and the first Terminal contact device and the second terminal contact device electrically connecting temperature assurance device. It also relates to a method for safety-critical disconnection of an electrically conductive connection of a first conductor section and a second conductor section in the event of a fire, in particular by means of a device according to the invention.

Devices for establishing an electrically conductive connection of a first electrical conductor section and a second electrical conductor section and for safety-critical disconnection in the event of a failure, which are also referred to below as fire protection devices, are generally known. A failure can in particular be a short circuit in an electrical system, which can occur, among other things, due to a failure of electrical components or lines in a fire. The devices in question have the effect that a failure occurring in one part of the system does not affect the entire system and causes an overall system failure, but is only limited to the part that can be electrically disconnected from the overall system, i.e. a function of the rest of the system - if only in one limited scope - is retained.

From the EP 2 928 025 A1 a connection device for connecting a multi-core branch line to a flat cable is known. This has a connection device housing which allows the flat cable to pass through. Penetration contacts for stripping-free contacting of the flat cable are arranged inside the connection device housing. The connection device has a branch line socket for the outlet of the branch line from the connection device, the branch line socket being arranged on the connection device housing. The branch line socket has a branch line socket housing and a fuse receptacle arranged therein for at least one fuse link for securing an associated wire of the branch line. The fuse holder is electrically connected to the penetration contacts via a connecting line, and electrically forms a separation point for the at least one protected wire of the branch line, so that the wire of the branch line beyond the point of separation can be electrically separated from the flat cable by responding to the fuse link. The branch line socket housing is openable and the at least one fuse link can be replaced by opening the branch line socket housing without opening the connection device housing. With such a device, an electrical system in the event of a short circuit in a subsystem can be electrically decoupled from the rest of the system, so that the short circuit only paralyzes the subsystem, but not the entire system. The disadvantage of this system is that there must be a short circuit in the system before the affected part is decoupled.

From the EP 2 568 542 A1 is also known a branching device for electrically connecting a branch line to a through line, the branching device for maintaining the function of the through line in the event of a fire being equipped with a thermally triggering separating device which provides the electrical connection between the branch line and the through line when the ambient temperature rises at a predetermined fire-typical value , a so-called separation temperature, separates automatically.

The EP 0 342 441 A2 discloses a temperature switching device for an electrotechnical part to be protected against excess temperature due to a fault, for example for a motor. The device comprises a first bimetallic switch and an ohmic resistor connected in parallel to it, so that after opening the bimetallic switch due to an overtemperature the current flows through the ohmic resistor, this generates heat and thereby the bimetallic switch, even when the switching process that initially triggers the switching process, is cooled by a Malfunction of the electrical part to be protected caused excess temperature due to the heat development of the ohmic resistance is kept open. A further, self-resettable temperature monitor, which has an opening temperature above that of the first monitor, but substantially below temperatures causing irreversible damage to bimetallic elements, is at least connected in series with the ohmic resistance. The two guards are in close thermal contact.

From the WO 2002/091398 A2 A circuit protection arrangement is known which has a first PTC resistor with a first switching temperature and a second PTC resistor with a second switching temperature connected in series therewith. Below a critical temperature, the first PTC resistor switches to a high one Resistance state and the arrangement can be reset. Above the critical temperature, the second PTC resistor switches to a high resistance state and initiates an action that causes the arrangement to be permanently open.

The DE 39 20 198 A1 describes an electrical fuse with a housing and two fusible conductors in series with different characteristics, the first fusible conductor being in a chamber filled with gas or vacuum and the second fusible conductor surrounded by an extinguishing agent filling and the chamber and the extinguishing agent filling directly next to or one above the other are arranged in the housing.

A thermal fuse is known from US 2006/0 232 372 A1, comprising a heat-sensitive pellet, a metal housing, a first line element with a first electrode, which is formed at one end thereof, and a second line element with a second electrode, which is on a Is formed inner wall surface of the housing, and a switching function element, which contains a spring element that presses against the heat-sensitive pellet, and a movable conductor. At an operating temperature at which the heat sensitive pellet softens and melts, the thermal fuse switches a circuit between the first and second electrodes and is characterized in that the heat sensitive pellet goes through a process that facilitates activation, so that the thermal fuse reacts faster to changes the operating temperature responds.

In view of the prior art described above, the invention has for its object to provide a device that responds quickly in a fire and in particular before a short circuit occurs and disconnects an affected part of an electrical system safely and quickly in a particularly reliable manner , in particular ensuring that this function of the device is maintained even in the event of a continuing fire and the associated extreme rise in temperature.

According to the invention, this object is achieved by a device according to claim 1, that is to say by a device for establishing an electrically conductive connection of a first conductor section and a second conductor section and for safety-critical disconnection in the event of a fire, comprising a first connection contact device for contacting the first conductor section, a second connection contact device for contacting the second conductor section and a temperature assurance device electrically connecting the first connection contact device and the second connection contact device, the temperature assurance device having at least two temperature assurance elements connected in series in the form of a first temperature assurance element and a second temperature assurance element, the first temperature assurance element being of such a nature, that the electrical connection in a response temperature range from T1 to T3 The connection between the first connection contact device and the second connection contact device is safely interrupted and the second temperature protection element is such that it reliably interrupts the electrical connection between the first connection contact device and the second connection contact device in a response temperature range from T2 to T5, where T1 <T2 <T3 < T5.

Essential to the invention is, among other things, the knowledge that, in the case of known thermal fuses or thermal fuse elements, a safe disconnection at any temperature above a certain response temperature of the respective fuse can generally no longer be guaranteed. For example, at very high temperatures, which can occur in the event of a fire and for which known thermal fuses are not designed, certain components of the fuse may melt, so that conductor bridges can occur, with which an electrical separation cannot be guaranteed with certainty , In the case of fire protection devices such as that of the invention, it is particularly important that the safety function, i.e. the disconnection of the electrical connection in the event of a fire, is not only triggered when a response temperature is exceeded, but also, in addition, regardless of the temperatures present on the fire protection device. It should therefore be ruled out that the fire protection device triggers at the response temperature and disconnects the electrical connection, but later loses its safety function if the temperature continues to rise (e.g. a continuing fire), for example because a temperature protection element contained in the fire protection device loses its separation function. e.g. it melts.

With regard to a method, the above-mentioned object is achieved by a method for safety-critical disconnection of an electrically conductive connection of a first conductor section and a second conductor section in the event of a fire, in particular by means of a device according to the invention, in particular by means of a device according to one of claims 1 to 7 , wherein an electrical temperature protection device electrically connects a first connection contact device and a second connection contact device to one another, the temperature protection device connected at least two in series Has temperature fuse elements in the form of a first temperature fuse element and a second temperature fuse element, the first temperature fuse element reliably interrupting the electrical connection between the first connection contact device and the second connection contact device in a response temperature range from T1 to T3 and the second temperature protection element in a response temperature range from T2 to T5 electrical connection between the first connection contact device and the second connection contact device is reliably interrupted, T1 <T2 <T3 <T5.

The invention thus has the particular advantage that a suitable combination and series connection of at least two temperature protection elements that respond in different temperature sections and in particular keep the electrical connection safely separate in different temperature sections, a relatively large temperature range is provided in which the electrical connection between the first and the second connection contact device is not only safely disconnected, but moreover is also kept securely separated. This is to be understood to mean that after the temperature fuses and thus the device have responded as intended, a safe disconnection of the electrical circuit is guaranteed even at prolonged high temperatures and / or further increasing temperatures. As a result, common temperature switch-off elements which interrupt in a certain temperature range above a response temperature and which lose, reduce or lose this function at temperatures above this range can be used. It can also be said that the first temperature assurance element guarantees electrical isolation in a first temperature range between T1 and T3, but not reliably above the temperature T3. The separation function at temperatures above T3 is taken over by the second temperature protection element, which guarantees electrical separation in a second temperature range between T2 and T5. If the second temperature fuse element cannot guarantee a safe separation above T5, another temperature fuse element can be used for this purpose, or further temperature fuse elements can be used in a corresponding manner.

It is of course completely uninhibited that a fire can ultimately lead to such high temperatures that all of the facilities exposed to the fire react in an unpredictable manner and behave completely unpredictably and completely undefined, e.g. by decompose and possibly lead to completely different structures, of which it cannot be known in advance how the electrical conductors in question behave. Here too, of course, the invention finds its limit from certain very high temperatures, despite the combination of the temperature assurance elements in question.

For the purposes of the invention, the first and the second conductor section are electrical conductor sections and serve to transmit electrical current. In particular, the first conductor section can be a through line and the second conductor section can be a branch line, it being possible for a plurality of consumers, each with a branch line, to be connected to a through line with the interposition of a device according to the invention. The conductor sections can in particular be multi-core, separate connection contact devices being provided for each core in the device. In addition, a separate temperature protection element can be provided for each wire, ie the device has a number of temperature protection elements corresponding to the number of wires. In terms of circuitry, the temperature protection device of the device is arranged between the first connection contact device and the second connection contact device and, in the normal case, that is to say when there is no malfunction, causes a transmission of electrical current from the first conductor section via the first connection contact device to the second connection contact device and the second conductor section. In the event of a malfunction, here in the form of a fire, for example, the temperature protection device is triggered or triggered, as a result of which there is an interruption or disconnection of the electrical connection between the first connection contact device and the second connection contact device.

According to the invention, the response or triggering of the temperature safety device is brought about by the heat that occurs in the vicinity of a source of fire in the event of a fire. For example, the temperature fuse element can have a fusible link insert that melts in the respective response temperature range and thus interrupts the electrical connection. Alternatively or additionally, the temperature securing device can have an essentially cylindrical and hermetically sealed hollow body made of a brittle material (softening temperature securing). This is filled with a medium that expands when heated. When a predetermined limit temperature is exceeded, the hollow body breaks and the electrical connection between the first connection contact device and the second connection contact device is interrupted.

Advantageous embodiments of the invention are claimed in the subclaims and are explained in more detail below.

An embodiment of the invention is characterized in that the first temperature assurance element and the second temperature assurance element are electrically conductive at a temperature less than or equal to T1, and in this way the first connection contact device is electrically connected to the second connection contact device.

According to a further embodiment, which makes it possible to cover an even larger temperature range, the temperature securing device has a third temperature securing element. This is such that it reliably interrupts the electrical connection between the first connection contact device and the second connection contact device in a response temperature range from T4 to T6, with T4 <T5 <T6. The overall temperature range in which the device operates safely can be expanded further by providing additional temperature protection elements with corresponding response temperature ranges.

If the temperature assurance device has a substantially cylindrical and hermetically sealed hollow body made of a brittle material, as already mentioned above, an electrically conductive coating can be applied to the outside of the hollow body. This can be in the form of a full-surface coating or at least one electrical conductor track. Alternatively or additionally, the coating can be a conductive lacquer or a metallization, in particular it can be vapor-deposited. The hollow body can be a hollow glass body or it can have a predetermined breaking point which ensures that the hollow body breaks between the connection contact devices to be electrically insulated from one another.

In this embodiment, the heat development leads to heating and thus thermal expansion of the medium hermetically enclosed in the hollow body. The hollow body and the medium enclosed therein are matched to one another such that when a preselected / predetermined limit temperature is exceeded, the expansion of the medium is so great that the hollow body can no longer withstand the internal pressure exerted by the medium and fails, in particular breaks, bursts or bursts , A particular advantage of the invention is that, in the event of a fire, the device does not respond only when a short circuit occurs, but only if the medium is heated to the threshold temperature. This can be particularly relevant in potentially explosive atmospheres, where short circuits and any sparks that may arise are to be avoided.

According to one embodiment of the invention, an electrical connection can be brought about by the hollow body carrying a conductor element which electrically connects the first connection contact device to the second connection contact device. This can be arranged inside or outside the hollow body. In addition, the hollow body itself can be electrically conductive. According to one embodiment, an electrically conductive coating can be applied to an outside of the hollow body, for example in the form of a full-surface coating or at least one electrical conductor track. The coating can in particular be a conductive lacquer or a metallization. It can also be vapor-deposited. Cracking of the hollow body in the event of a fire either destroys the electrical connection itself (for example, an electrically conductive coating applied to the hollow body also cracks) or the hollow body detaches itself from the first and / or second connection contact device due to its destruction, which also causes the hollow body worn conductor element released and the electrical connection is interrupted.

According to one embodiment of the invention, the hollow body is a hollow glass body. This is advantageous in view of the particularly suitable properties of glass such as high brittleness and hardness as well as the type of failure (suddenly, suddenly) due to excessive internal pressure (bursting or cracking). However, the hollow body can also consist of another material with corresponding mechanical properties. Alternatively or additionally, the hollow body can have a predetermined breaking point. This is designed in such a way that a proper failure is ensured, for example in the form of the hollow body breaking between the connection contact devices to be electrically insulated from one another.

The securing element can in particular be held by a first and a second clamp element, in particular a metallic clamp element. The first clamp element is electrically connected to the first connection contact device and the second clamp element is electrically connected to the second connection contact device. At least one of the clamp elements can be designed in such a way that, in the event of fire and when the securing element responds, the hollow body is released from the corresponding clamp element. For example, the first clamp element and / or the second clamp element can each have a first clamp arm and have a second clamp arm. In this embodiment of the invention, these are arranged essentially parallel to one another and on sides of the securing element that are opposite one another in the radial direction. One can also say that the hollow body is held in the radial direction. In another embodiment, each clamp element has only one clamp arm. These are arranged essentially parallel to one another and on the axially opposite sides of the securing element and the hollow body is held in the axial direction, which causes a particularly safe failure of the hollow body in the event of damage, since the point at which the hollow body fails in any case lies between the clamp arms holding these. The radial and axial position designations are used here with reference to the longitudinal axis of the securing element.

If, according to a development of the invention, a gap between the first clamping arm and the second clamping arm is designed to be open to at least one side, arranging the securing element between the two clamping arms and removing or escaping fragments of the hollow body in the event of failure are particularly simple and safe , The clamping arms are preferably designed and aligned such that the opening between them is open at the bottom when the device is installed as intended, so that fragments of the hollow body can fall out of the clamping space between the clamping arms particularly easily and safely.

One embodiment is characterized in that the hollow body is designed like a festoon and, for example, has a contact cap on both sides of the cylinder end, each of which is electrically conductively connected to a conductor arranged inside or outside the hollow body. The conductor can be formed separately from the hollow body or in one piece with it. The contact caps can each be designed as a metal cap, in particular in such a way that they are located at the end on the cylindrical hollow body and allow contacting in the axial direction. Such contact caps are advantageous for an end clamping of the hollow body in the axial direction.

The device can be adapted particularly easily to different response temperature ranges (threshold temperatures). This can be done within the scope of the invention by providing several different temperature protection elements for the device. Each is set to a certain temperature range and a certain threshold temperature, for example by a corresponding selection of a fusible link or in the case of safety fuses for the medium in the hollow body and / or by the provision of more or less large gas bubbles in the medium, which are a kind of compressible Form dampers and thus influence the thermal expansion of the medium, and / or by appropriate training and / or weakening of the hollow body itself. In summary, the device can be operated with a number of different securing elements, each designed for a specific response range and a specific threshold temperature and is marked accordingly, in particular for a user, for example by color coding.

The device can be designed as a branch socket or distributor socket with a housing. The housing can in particular comprise a housing part which can be closed with a cover and in which the connection contact devices and the securing element or the securing elements are arranged. The housing preferably has a base element which carries the connection contact devices and the securing elements. The housing and the base element are preferably formed from an insulating and / or fire-resistant material such as plastic or ceramic. The first and the second connection contact device are electrically insulated from one another by the base element and the housing.

• 1 eine teilgeschnittene Ansicht einer Ausführungsform der Vorrichtung nach der Erfindung,
• 2 eine schematische Darstellung einer Ausführungsform eines Temperatursicherungselements und
• 3 eine schematische Darstellung einer weiteren Ausführungsformen eines Temperatursicherungselements.

Advantages of the present invention result from the following exemplary and non-limiting description of the invention with reference to figures. These are only schematic in nature and only serve to understand the invention. Show:

• 1 2 shows a partially sectioned view of an embodiment of the device according to the invention,
• 2 is a schematic representation of an embodiment of a temperature control element and
• 3 is a schematic representation of another embodiment of a temperature control element.

In the 1 shown device 1 has a housing which can be closed and opened with a cover, not shown 2 made of an insulating plastic. The housing 2 has two moisture-insulated sockets, not shown in the figure, for a first conductor section, also not shown and designed as a through line. It also has at least one such socket (not shown) for a second conductor section (not shown) designed as a branch line.

In the case 2 is a base element in the middle 5 arranged from a ceramic. On the the housing 2 opposite side of the base element 5 are insulating partitions 6 arranged between or next to each of which there is a recording room 7 for one core of the first line section. Since the 1 is a sectional view, is the front receiving space in the figure 7 shown cut. Any recording room 7 is a first connection contact device 8th assigned. This essentially consists of a base 9 , a clamping element arranged above 10 and one with the clamping element 10 with a thread 11 engaged and axially fixed on two adjacent partitions 6 arranged support element 12 by an insulation cap 13 is covered. The base 9 is stationary on the base element 5 educated. The clamping element 10 is by means of a spring 14 opposite the carrier element 12 towards the base 9 biased. By screwing the support element together 12 and clamping element 10 can be one between the base 9 and the clamping element 10 located conductor wire are clamped. In doing so, it will hit the base 9 comprehensive contacting element 15 pressed so that the conductor wire is electrically conductive with the contacting element 15 connected is.

Every first connection contact device 8th is a contact device 19 with a contacting element 23 assigned to the base element 5 is arranged. In addition, every first connection contact device 8th a second connection contact device 18 assigned. The second terminal contact device 18 comprises a contacting element 20 on the one hand with a clamping device 21 for a line wire, not shown, of a branch line and, on the other hand, with a connection contact 22 is provided.

A first temperature control element 27 is electrical on the one hand with the contacting element 15 and on the other hand with the contacting element 23 connected. A second temperature control element 28 is on the one hand from the contacting element 23 and on the other hand with the connection contact 22 connected. The two temperature protection elements 27 and 28 have different thermal response behavior and / or disconnection behavior and are in series between the first connection contact device 8th and the second connection contact device 18 connected. It makes sense to compensate for any possible restart points of one of the temperature fuse elements by the other temperature fuse element and to make sure that one of the temperature fuse elements in one always has the electrical connection between the first and the second connection contact device 18 keeps separate, regardless of the temperature in a fire.

For example, the first temperature fuse element 27 cause a safe separation in a temperature range between 125 ° C and 350 °, however, be conductive in a range from 350 ° C to 450 ° C (or the separation state cannot be guaranteed safely) and the electrical connection at higher temperatures from 850 ° C separate again defined. The second temperature fuse 28 on the other hand, the electrical connection can be safely disconnected in a temperature range up to 850 ° C. It "bridges" (maintains the interruption) thus making the first temperature fuse element conductive 27 in the range between 350 ° C and 450 ° C. The other way round, the first temperature protection element is guaranteed 27 Above 850 ° C, a safe and defined disconnection of the electrical connection and "bridges" (maintains the interruption), thus a disconnection of the second fuse element that is not safe in this temperature range 28 , This ensures separation over the entire temperature curve (125 ° C to 1100 ° C).

The first and / or second temperature fuse element can be, for example, a fuse (thermal cut off) or the like. In addition, the temperature fuse element can be a fan-like fuse that has a substantially cylindrical and hermetically sealed hollow body 29 made of a brittle material, here made of glass. The 2 and 3 show schematic representations of two embodiments of the securing element. In the first embodiment, the hollow body 29 with the electrically conductive coating 31 provided that ensures a power line. In the second embodiment, the hollow body 29 with a contact cap on both ends of the cylinder 32 Mistake. These are each in the form of a metal cap 32 trained and with one inside the hollow body 29 through its interior 30 led ladder 33 electrically connected. A predetermined breaking point 34 represents a failure of the hollow body 29 between the contacting elements intended for its inclusion in the device 15 . 22 . 23 for sure.

In the hermetically sealed interior volume 30 of the hollow body 29 there is a medium that expands when heated. The amount and the thermal expansion properties of the medium are such on the hollow body 29 matched that the hollow body when a predetermined limit temperature is exceeded 29 breaks. The outside of the hollow body 29 can with an electrically conductive coating 31 be provided (see in 2 ). This is when the securing element is inserted between the contacting elements 15 . 22 . 23 contacted by these, so that a current flow is possible, current through the conductive coating of the hollow body 29 is directed.

If the temperature rises in the event of a fire, the medium in the hollow body expands 29 out. If the threshold temperature is exceeded, it then leads through the medium to the hollow body 29 applied internal pressure to failure of the hollow body 29 in the form of breaking, shattering or bursting and the securing element responds. Disconnecting the electrical connection between the contacting elements 15 . 22 . 23 then occurs through destruction of the electrical line 33 / Coating 31 in itself and / or in that the hollow body 29 as a result of its destruction by the contacting elements 15 . 22 . 23 loosens and falls out and the electrical connection is disconnected.

LIST OF REFERENCE NUMBERS

1

contraption

2

casing

5

base element

6

partition wall

7

accommodation space

8th

first connection contact device

9

base

10

clamping element

11

thread

12

carrier element

13

insulation cap

14

feather

15

contacting

17

clamping arms

18

second connection contact device

19

contactor

20

contacting

21

clamper

22

connection contact

23

contacting

27.28

Temperature fuse element

29

hollow body

30

internal volume

31

coating

32

Contact cap

33

ladder

34

Breaking point

Claims (8)

Device (1) for establishing an electrically conductive connection of a first conductor section and a second conductor section and for safety-critical disconnection in the event of a fire, comprising a first connection contact device (8) for contacting the first conductor section, a second connection contact device (18) for contacting the second conductor section and a temperature assurance device connecting the first connection contact device (8) and the second connection contact device (18) to one another in an electrically conductive manner, characterized in that the temperature assurance device has at least two temperature assurance elements connected in series in the form of a first temperature assurance element (27) and a second temperature assurance element (28), wherein the first temperature assurance element (27) is designed such that it provides the electrical connection between the first connection in a response temperature range from T1 to T3 Contact contact device (8) and the second connection contact device (18, 19) safely interrupts and the second temperature fuse element (28) is such that it is in a response temperature range from T2 to T5, the electrical connection between the first connection contact device (8) and the second connection contact device ( 18, 19) safely interrupts, where T1 <T2 <T3 <T5 applies. Device (1) after Claim 1 , characterized in that the first temperature assurance element (27) and the second temperature assurance element (28) are electrically conductive at a temperature of less than or equal to T1, and in this way the first connection contact device (8) is electrically connected to the second connection contact device (18). Device according to one of the preceding claims, characterized in that the temperature securing device has a third temperature securing element which is designed in such a way that it ensures the electrical connection between the first connection contact device (8) and the second connection contact device (18) in a response temperature range from T4 to T6 interrupts, where T4 <T5 <T6 applies. Device (1) according to one of the preceding claims, characterized in that the temperature securing elements (27, 28) each have a fusible link insert which melts in the respective response temperature range and thus causes an interruption in the electrical connection. Device (1) according to one of the preceding claims, characterized in that the temperature securing device has a substantially cylindrical and hermetically sealed hollow body (29) made of a brittle material which is filled with a medium which expands when heated, such that when one is exceeded predetermined limit temperature of the hollow body (29) breaks and the electrical connection between the first connection contact device (8) and the second connection contact device (18) is interrupted. Device (1) after Claim 5 , characterized in that an electrically conductive coating (31) is applied to the outside of the hollow body (29), in particular in the form of a full-surface coating (31) or at least one electrical conductor track and / or the coating (31) is a conductive lacquer or a metallization , in particular is vapor-deposited and / or that the hollow body (29) is a glass hollow body (29) or that the hollow body (29) has a predetermined breaking point (34) which causes the hollow body (29) to break between the connection contact devices (to be electrically insulated from one another) 8, 18) ensures. Device (1) after Claim 5 or 6 , characterized in that the hollow body is held by a first clamp element, in particular a metallic clamp element, and a second clamp element, in particular a metallic clamp element, the first clamp element being electrically connected to the first connection contact device (8) and the second clamp element being electrically connected to the second connection contact device (18 ) are connected. Method for the safety-critical disconnection of an electrically conductive connection of a first conductor section and a second conductor section in the event of a fire, an electrical temperature protection device (27, 28) electrically connecting a first connection contact device (8) and a second connection contact device (18), wherein the temperature securing device has at least two temperature securing elements connected in series in the form of a first temperature securing element (27) and a second temperature securing element (28), the first temperature fuse element (27) reliably interrupts the electrical connection between the first connection contact device (8) and the second connection contact device (18) in a response temperature range from T1 to T3 and the second temperature assurance element (28) reliably interrupts the electrical connection between the first connection contact device (8) and the second connection contact device (18) in a response temperature range from T2 to T5, T1 <T2 <T3 <T5.

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