Fuse device for high-voltage applications

Abstract

The invention relates to a fuse device for high-voltage applications, comprising a housing (10); an actuation chamber (12) and an extinguishing chamber (14), which are formed in the housing (10); a busbar (16) which extends through the housing (10) and between the actuation chamber (12) and the extinguishing chamber (14); and a separating element (34) which can be displaced by means of an actuator (32) and the separating surface (84) of which, said separating surface facing the busbar (16), has different distances to the busbar (16) in the cross-section in the non-triggered state of the separating element (34). According to the invention, the busbar (16) has a second predetermined breaking point (78), wherein a first predetermined breaking point (76) is arranged opposite a section (86) of the separating surface (84) of the separating element (34) when viewed in the movement direction of the separating element (34), said section having the shortest distance to the busbar (16) in the non-triggered state of the separating element (34), and in the triggered state, the busbar section (42) between the first predetermined breaking point (76) and the second predetermined breaking point (78) is displaced into the extinguishing chamber (14) so as to be completely separated from the adjoining busbar sections (80). Thus, an arc can be extinguished in a faster manner.

Description

[0001] DESCRIPTION

[0002] Safety device for high-voltage applications

[0003] The invention relates to a fuse device for high-voltage applications with a housing, an actuation chamber and an arcing chamber which are formed in the housing, a busbar which extends through the housing and between the actuation chamber and the arcing chamber, a separating body which can be displaced from the actuation chamber against the busbar by means of an actuator, through which separating body a busbar section can be displaced into the arcing chamber for severing the busbar at a first predetermined breaking point, and whose separating surface directed towards the busbar has different distances from the busbar in a cross-section along a plane which is spanned by the main extension direction of the busbar in the fuse device and the direction of movement of the separating body when the actuator is triggered, in the non-triggered state of the separating body.

[0004] Such safety devices are usually designed with a pyrotechnic igniter as an actuator and are used, particularly in vehicles with high-voltage applications such as hybrid vehicles or fully electric vehicles, to disconnect the power line between the battery and the consumers, in particular the vehicle's drive, in the event of an accident in a few thousandths of a second in order to avoid short circuits.

[0005] However, due to the high voltages involved, arcing occurs between the free ends of the busbar when the busbars are separated, causing a current to continue flowing for several seconds and resulting in extremely high short-circuit currents that can cause life-threatening electric shocks to vehicle occupants or emergency personnel. Since these arcs cannot be completely avoided, precautions must be taken to extinguish them as quickly as possible.

[0006] For example, JP 2005-019411 describes a pyrotechnic safety device whose busbar is thinner in an area opposite the separating body, making it easier to separate it from the rest of the busbar. Accordingly, this area of ​​the busbar serves as a predetermined breaking point at which, when the pyrotechnic igniter is ignited, the separating body penetrates the busbar, which is then moved into an extinguishing chamber. The separating body of this safety device has a sloped separating surface so that, when triggered, the separating body only strikes one side of the thinner busbar section and severs the busbar. The section of the busbar opposite the extinguishing chamber is rotated into the extinguishing chamber by the area of ​​the busbar that forms the other transition between the thicker and thinner sections of the busbar.This rotation creates a relatively long arc, but the length of this arc is usually not sufficient to extinguish it as quickly as possible.

[0007] The task therefore arises of creating a safety device for high-voltage applications that, when triggered, can stretch the arc to such an extent that the isolating voltage significantly exceeds the source voltage, thus extinguishing the arc. This should prevent potential short-circuit currents that could lead to electric shock.

[0008] This object is achieved by a safety device for high-voltage applications having the features of main claim 1. The safety device for high-voltage applications according to the invention has a housing in which an actuation chamber and an extinguishing chamber are formed. The housing can in particular be designed in several parts and, for example, have at least one extinguishing chamber housing which surrounds the extinguishing chamber, and an actuation chamber housing which surrounds the actuation chamber. An actuation chamber is understood to be a space in which an actuator is at least partially arranged. This can in particular be a pyrotechnic igniter, the triggering of which creates pressure which accelerates a separating body out of the actuation chamber. An extinguishing chamber is understood to be a space into which part of a busbar is displaced, whereby the busbar is separated into at least two parts.The high voltages present create an arc, also known as plasma, between the separated busbar sections in the arcing chamber, which leads to burns. In order to keep these arcs as short as possible, this arc must be extinguished as quickly as possible. The safety device accordingly has a busbar that extends through the housing and between the actuation chamber and the arcing chamber. Furthermore, a separating body is arranged in the actuation chamber. This separating body can be moved against the busbar by means of the actuator. When the actuator is triggered, this separating body moves a busbar section into the arcing chamber to sever the busbar at a predetermined breaking point. In this way, it is itself at least partially moved from the actuation chamber into the arcing chamber.A separating surface of this separating body directed towards the busbar has, in a cross-section along a plane spanned by the main direction of extension of the busbar in the safety device and the direction of movement of the separating body when the actuator is triggered, different distances from the busbar when the separating body is not triggered. The direction of movement of the current body is understood to be the direction axially through the safety device, i.e. the direction along which the separating body is displaced when the actuator is triggered. The main direction of extension of the busbar is understood to be a line from a first section of the busbar fastened in the housing, across the part of the busbar to be severed, to the opposite part fastened in the housing. Accordingly, the lower separating surface of the separating body is at least partially inclined and thus has different distances from the busbar.Accordingly, the separating body comes into contact with the busbar or the section to be separated at different times.

[0009] According to the invention, in addition to the first predetermined breaking point, the busbar also has a second predetermined breaking point, at which the busbar section to be separated can be separated from the adjacent busbar sections. The first predetermined breaking point is arranged, viewed in the direction of movement of the separating body, opposite a section of the separating surface of the separating body that has the shortest distance to the busbar when the separating body is not triggered, so that this section of the separating surface of the separating body opposite the first predetermined breaking point is the first to strike the busbar upon triggering and severs it in the region of the first predetermined breaking point.The busbar section to be severed is then rotated around the second predetermined breaking point between the first predetermined breaking point and the second predetermined breaking point until a separation finally occurs in the area of ​​the second predetermined breaking point as well, so that in the triggered state the busbar section to be severed is arranged completely separated from the rest of the busbar or the adjacent busbar sections and displaced into the arcing chamber. This has the effect of initially creating a large resistance between the first severed end of the busbar section to be severed and the end of the fastened busbar section, which resistance also increases as the distance between these two busbar ends increases. This growing distance causes the arc to be lengthened. The separation at the second predetermined breaking point creates additional resistance and an additional arc length.These two separations create a separation voltage that exceeds the source voltage, extinguishing the arc and preventing current from flowing. This significantly shortens the time during which short-circuit currents, which could cause personal injury, flow. The two-stage separation also reduces the required separation force.

[0010] Preferably, the section of the separating surface of the separating body that is arranged opposite the first predetermined breaking point is arranged at a first end of the separating body, viewed in the main direction of extension of the busbar, and the distance of the separating surface to the busbar increases in the direction of the opposite second end. This growth can be continuous and achieved by forming a bevel. However, sections that run parallel or discontinuously to the busbar can also be formed along the separating surface, viewed in the main direction of extension of the busbar. It is important that the shearing of the busbar section to be severed at the second predetermined breaking point only occurs after a certain rotation of the busbar section to be severed about the second predetermined breaking point. In this way, a greater expansion of the arc is achieved.Furthermore, the load on the components is reduced so that lighter materials can be used.

[0011] In an advantageous embodiment, the second predetermined breaking point, viewed in the main extension direction of the busbar, has a distance from the separating body in the non-triggered state. This allows a rotation of the busbar section to be severed by up to 90° around the second predetermined breaking point, so that the greatest possible distance is created in the smallest space. Furthermore, it is advantageous if the distance of the second

[0012] The predetermined breaking point to the second end of the separator, viewed in the main direction of the busbar extension, is greater than the extension of the busbar in the direction of movement of the separator. This distance ensures that the busbar section to be separated fits next to the separator when triggered and can thus be moved into a position rotated by 90°.

[0013] It is particularly preferred if a stop is formed in the arcing chamber, which, viewed in the main extension direction of the busbar, is arranged between the second predetermined breaking point and the separating body in the arcing chamber. When the busbar section to be severed rotates, it comes into contact with this stop shortly before the end, whereby the busbar section is reliably sheared off at the second predetermined breaking point.

[0014] In a further embodiment, the distance between the stop and the busbar section to be severed, viewed in the direction of movement of the separating body, is less than the extension of the busbar in the direction of movement of the separating body before the separating body is triggered. This ensures that the busbar section must actually be sheared off in the area of ​​the second predetermined breaking point at the stop.

[0015] It is particularly preferred if the stop is formed on a side wall of a quenching chamber housing that defines the quenching chamber and surrounds the quenching chamber. This can, for example, be designed as a plastic part and cushion the severed busbar section accordingly. In this way, no additional components are required for this stop. Preferably, the distance between a floor of the quenching chamber and the busbar is greater than the busbar section to be severed, and a pocket is formed in the quenching chamber that extends between the side wall of the quenching chamber and a side surface of the separating body that, in the triggered state, faces the second predetermined breaking point.Thus, the severed busbar section can be moved vertically into the pocket, ensuring a distance from the adjacent fixed busbar section, thus preventing contact between the fixed busbar end and the severed busbar end after separation.

[0016] Preferably, the side wall of the arcing chamber defining the pocket is formed by an inner wall of the arcing chamber housing. Accordingly, an additional space can be provided between the outer and inner walls, which can be used, for example, to dissipate the existing pressure. The compressive strength is also increased.

[0017] Furthermore, it is advantageous if a web extends from the floor of the arcing chamber housing toward the busbar into the arcing chamber. The distance of the web from the inner wall of the arcing chamber housing, viewed in the direction of extension of the busbar, is greater than the extension of the busbar section to be separated, viewed in the direction of movement of the isolating body, and is smaller than the existing distance between the isolating body and the inner wall of the arcing chamber housing when the isolating body is triggered. This creates a boundary in the floor area that prevents the severed busbar section from slipping from its vertical position.

[0018] In a further embodiment, several adjacent ribs are formed on the inner wall of the arcing chamber housing, extending into the arcing chamber. These ribs can absorb the kinetic energy of the severed busbar section and convert it into deformation energy, thereby increasing durability.

[0019] In a further development of the invention, the ribs are lamellar and extend diagonally in alternating directions toward the arcing chamber. This diagonal arrangement is particularly well suited for absorbing high energy with minimal material expenditure.

[0020] Preferably, the busbar section to be severed is offset from the adjacent busbar sections in the direction of movement of the separating body when the separating body is not triggered. The busbar thus has a stepped cut, whereby a cross-sectional constriction occurs only in a differentially small space, so that the electrical resistance in the busbar is only slightly increased. Nevertheless, the remaining connection cross-section between the busbar section to be severed and the adjacent busbar sections on both sides is so small that the required separation force is significantly reduced.

[0021] In a further embodiment, the offset of the busbar section to be severed from the adjacent busbar sections corresponds to 10% to 60% of the busbar's extension in the direction of movement of the separating element. The fine cut portion of the separation is selected so that it is brought close to the breaking point, thereby significantly reducing the required separation force.

[0022] In the case of such an offset, it is advantageous to use

[0023] An extension of the busbar section to be severed in the direction of extension of the busbar is formed, the distance of which from the fixed busbar section adjacent to the second predetermined breaking point, viewed in the direction of extension of the busbar, is smaller than the portion of the busbar section to be severed that extends beyond the fixed busbar section in the direction of movement of the separating body. This makes it particularly easy to ensure that the busbar section is sheared off at the second predetermined breaking point.

[0024] In a further advantageous embodiment, the stop surface is formed on an intermediate housing surrounding the busbar, which makes additional components unnecessary.

[0025] This creates a fuse device for high-voltage applications in which the arc created when the busbar section is separated is extinguished very quickly due to the large arc extension and the formation of a second arc, as this increases the resistance to such an extent that the separation voltage exceeds the source voltage. This prevents prolonged short circuits and electric shocks, and the resulting personal injuries. Nevertheless, this fuse device can be designed relatively compactly, as the separation force is reduced compared to conventional designs due to the two-stage separation. The lower internal forces and their absorption by the ribs also allow the use of lighter and more cost-effective materials.

[0026] An exemplary embodiment of a safety device according to the invention for high-voltage applications is illustrated in the figures and is described below using a safety device designed as a pyrotechnic interrupter device. Figure 1 shows a side view of a safety device according to the invention in a sectional view before actuation.

[0027] Figure 2 shows the side view of the safety device according to the invention from Figure 1 in a sectional view after actuation.

[0028] Figure 3 shows a top view into an arcing chamber housing of the safety device according to the invention from Figure 1 in a sectional view before actuation.

[0029] The safety device according to the invention, illustrated in the figures, is designed as a pyrotechnic interrupter device and consists of a housing 10, inside which an actuation chamber 12 and an extinguishing chamber 14 are formed, which are separated from one another by a busbar 16 extending through the housing 10 and via which, for example, a vehicle battery is connected to a consumer, such as a drive motor. The housing 10 is double-walled, with an inner wall 18 at least partially radially delimiting the extinguishing chamber 14 and the actuation chamber 12, and an outer wall 20 arranged radially spaced from the inner wall 18 and outwardly delimiting the safety device.

[0030] The housing 10 is constructed in three parts, with an intermediate housing 26 being clamped between an actuation chamber housing 22, in which the actuation chamber 12 is formed centrally, and an extinguishing chamber housing 24, in which the extinguishing chamber 14 is formed, with sealing rings 28 interposed therebetween.

[0031] The actuation chamber 12 in the actuation chamber housing 22 is radially surrounded by an inner wall section 30. An actuator 32, designed as a pyrotechnic igniter, is arranged inside this actuation chamber 12 in the area remote from the extinguishing chamber housing 24. Furthermore, in the non-triggered state, a separating body 34, which has a piston-like shape, is displaceably arranged inside the actuation chamber 12. This separating body 34 is guided radially at least in sections through the inner wall section 30 and axially delimits the actuation chamber 12 in the direction of the actuator 32. Furthermore, the actuation chamber housing 22 has an outer wall section 36, which is connected to the inner wall section 30 of the actuation chamber housing 22 via ribs (not shown). A pressure relief volume 38 is formed between the inner wall section 30 and the outer wall section 36 by the free spaces between the ribs.

[0032] The intermediate housing 26 has a flange section 40, with which the intermediate housing 26 is clamped between the actuation chamber housing 22 and the arcing chamber housing 24. This flange section 40 surrounds the busbar 16 on all sides, with the exception of a busbar section 42 to be separated, which axially directly borders the actuation chamber 12 and the arcing chamber 14 before triggering. This busbar section 42 is delimited only on its radial sides by the intermediate housing 26, while the two sides of the busbar section 42 facing the actuation chamber 12 and the arcing chamber 14 are exposed to the actuation chamber 12 and the arcing chamber 14. Furthermore, two or more flow openings (not shown in the figures) are formed in the flange section 40, which are arranged in an axial extension of the pressure reduction volume 38 of the actuation chamber housing 22.A guide section 48 extends axially from the flange section 40, which guide section engages in a receptacle 50 on the inner wall section 30 of the actuation chamber housing 22 in the area of ​​the actuation chamber housing 22 facing the intermediate housing 26 and radially delimits the actuation chamber 12 in this area and thus guides the separating body 34. In addition, the intermediate housing 26 has a guide section 52 that extends into the quenching chamber housing 24 and delimits the quenching chamber 14 on three sides at least in sections. On the fourth side, this guide section 52 is open. On this side, a side wall 54 of the quenching chamber 14 is formed by an inner wall 56 of the quenching chamber housing 24. Arranged on this inner wall 56 are lamellar ribs 58 that project into the quenching chamber 14 and are inclined to one another in alternating directions.

[0033] On the other three sides, this guide section 52, together with wall sections 62 projecting from a bottom 60 of the arcing chamber housing 24 in the direction of the actuation chamber housing 22, to which it is precisely aligned, forms the remaining inner walls 64 of the arcing chamber 14. The inner walls 56, 64 are arranged at a distance from surrounding outer walls 66 of the arcing chamber housing 24, which are formed by the arcing chamber housing 24.

[0034] An insert 68 is arranged on the base 60, which axially delimits the arcing chamber 14 relative to the base 60 of the arcing chamber housing 24 below the separating body 34. Immediately laterally adjacent to the insert 68, on the side of the arcing chamber 14 opposite the ribs 58, there is also arranged on the base 60 a metal mesh 44, which extends axially between the inner wall 64 and the outer wall 66 surrounding the arcing chamber 14. The metal mesh 44 extends axially to just before the flange section 40 of the intermediate housing 26. An opening 74 is formed in a side wall 72 of the guide section 52 of the intermediate housing 26, via which opening a fluidic connection is established from the interior of the arcing chamber 14 to the metal mesh 44. This opening 74 is formed directly adjacent to the flange portion 40, specifically on the side wall 72, which is arranged in axial extension of a first predetermined breaking point 76 of the busbar 16.

[0035] In addition to the first predetermined breaking point 76, the busbar 16 also has a second predetermined breaking point 78 spaced apart therefrom. In the present exemplary embodiment, the two predetermined breaking points 76, 78 are formed by arranging the busbar section 42 to be severed between the two predetermined breaking points 76, 78, offset in a direction of movement X of the separating body 34 relative to adjoining busbar sections 80, which are surrounded by the intermediate housing 26. As a result, the busbar section to be severed is only connected to the adjacent busbar sections 80 by 10-60% in cross-section.

[0036] Viewed in a main extension direction Y of the busbar 16, the first predetermined breaking point 76 is located directly opposite a first end 82 of the separating body 34, at which end the separating body 34 is at the shortest distance from the busbar section 42 to be separated. A separating surface 84 of the separating body 34 extends in cross-section in the main extension direction Y of the busbar 16, initially over a short section 86 with a shortest distance parallel to the busbar section 42 and then has a distance from the busbar section 42 that steadily increases in the direction of the second predetermined breaking point 78 and is thus formed obliquely, so that the second end 88 opposite the first end 82 is at the greatest distance from the busbar section 42.While the first predetermined breaking point 76, as already mentioned, is arranged directly below the first end 82 of the separating body 34 in the non-triggered state of the separating body 34, the other end 88, viewed in the main extension direction of the busbar 16, has a distance Z from the second predetermined breaking point 78. This distance Z is greater than the extension of the busbar section 42 to be severed, viewed in the direction of movement X of the separating body 34. In extension of the busbar section 42 to be severed in the extension direction Y of the busbar 16, a stop surface 90 is formed on the flange section 40 of the intermediate housing 26.The distance thereof from the fixed busbar section 80 adjacent to the second predetermined breaking point 78 is, viewed in the direction of extension Y of the busbar, smaller than the part of the busbar section 42 to be severed that projects beyond the fixed busbar section 80 in the direction of movement X of the separating body 34. This has the consequence that during the pivoted movement of the busbar section 42, the part of the latter that projects axially beyond the fixed busbar section 80 is rotated against the stop surface 90 and is thus sheared off at the second predetermined breaking point.

[0037] When using busbars 16 with other predetermined breaking points 76, 78, which are formed, for example, by a punched out section and in which the busbar section 42 to be severed is at the same height as the adjacent busbar section 80, a stop can alternatively be formed in the arcing chamber 14 in the area between the second end 88 of the separating body 34 and the second predetermined breaking point 78, viewed in the main extension direction Y of the busbar 16. This stop is to be formed on the inner wall 56 of the arcing chamber housing 24 and, viewed in the direction of movement X of the separating body 34, between the ribs 58 and the busbar section 42 to be severed. The distance of this stop from the busbar section 42 to be severed would have to be selected to be smaller than the extension of the busbar section 42, viewed in the direction of movement X of the separating body 34.

[0038] After the actuator 32 has been triggered and the busbar section 42 has been severed at the first predetermined breaking point 76, the separating body 34 is subsequently driven further into the arcing chamber 14. The busbar section 42 is rotated around the second predetermined breaking point 78 into the arcing chamber 14 until the side surface of the busbar section 42 strikes the stop surface 90. The continued movement of the separating body 34 creates a shear stress in the region of the second predetermined breaking point 78, which ultimately leads to a fracture at the second predetermined breaking point 78. Since at this point in time the separating body 34 has already penetrated relatively far into the arcing chamber 14 and the movement of the busbar section 42 to be severed occurs purely in a rotational manner around the second predetermined breaking point 78, this movement continues after the separation. This means that the busbar section 42 is rotated against the ribs 58, which absorb its kinetic energy.The busbar section 42 is accordingly rotated into a pocket 92, which is laterally delimited on the one hand by the inner wall 56 of the arcing chamber housing 24 and on the other hand by a side surface 94 of the isolating body 34 directed towards the second predetermined breaking point 78. For this purpose, the distance between the adjacent busbar sections 80 and the base 60 in the region of the pocket 92 must be selected such that it is greater than the longitudinal extent of the severed busbar section 42, in order to ensure that there is no longer any contact between the adjacent busbar sections 80 and the severed busbar section 42. In addition, the distance between the ribs 58 and the isolating body 34 in the triggered state must be selected to be greater than the extent of the busbar section 42 before triggering, viewed in the direction of movement of the isolating body 34.

[0039] In the area of ​​the base 60, the pocket 92 is also delimited by a web 96, which extends in the direction of the busbar 16 into the arcing chamber 14 and, on the one hand, delimits the severed busbar section 42 in its upright end position and, on the other hand, serves as a limit for the insert 68. If an emergency now occurs, for example due to a vehicle accident, the pyrotechnic actuator 32 is triggered. The separating body 34 is pressed against the busbar 16 by the deflagration and separates the busbar section 43 from the remaining busbar 16 at the first predetermined breaking point 76. The high voltage creates an arc in the area of ​​the first predetermined breaking point 76 between the free busbar ends. This arc can only expand through the opening 74 to the metal mesh 44, which is melted by the thermal energy.

[0040] This cools the arc, but the pressure created by the explosion of the igniter and by the melting of the metal mesh 44 and the resulting arc must be dissipated. In order to guide this gas flow into the pressure relief volume 38 available between the inner wall section 30 and the outer wall section 36 of the actuation chamber 12, groove-shaped recesses are formed in the base 60 of the arcing chamber housing 24, which serve as supply channels 98. These extend from the area below the metal mesh 44 to both sides of the arcing chamber housing 24 along the base 60, initially to below the insert 68, so that a gap 100 is formed between the base 46 and the insert 68 below the insert 68. From here, the supply channels 98 extend on both sides to the opposite outer walls 66 of the arcing chamber housing 24.From here, the supply channels 98 merge into flow channels 102, which are formed by groove-shaped depressions on the inner wall surface of the outer walls 66 and project upwards until they merge into the flow openings of the intermediate housing 26, which in turn are fluidically connected to the pressure relief volume 38 so that the pressure can be reliably reduced via the available volumes. In addition, when the busbar 16 is separated at the second predetermined breaking point 78, another arc is created, so that the total length of the existing arcs is increased, so much so that the resistance increases to such an extent that the separation voltage exceeds the source voltage. This leads to complete extinguishing and cooling of the arc in a short time. Due to the subsequent cooling after the arc has extinguished, the pressure inside the housing 10 also decreases, thus preventing any subsequent bursting.

[0041] This creates a safety device that can be used in a small installation space to quickly and reliably extinguish the arc, preventing prolonged short circuits and resulting injuries, and reliably preventing emissions. Yet, it still maintains high separation performance.

[0042] It should be clear that the scope of protection is not limited to the described embodiment, but various modifications are possible. In particular, different housing divisions or shapes of the components used can be provided. If necessary, a busbar with differently designed predetermined breaking points can also be used, or the damping stop can be created by the ribs via an additional insert.

Claims

P A T E N T A N S P R Ü C H E 1. A fuse device for high-voltage applications, comprising a housing (10), an actuation chamber (12) and an arcing chamber (14) formed in the housing (10), a busbar (16) extending through the housing (10) and between the actuation chamber (12) and the arcing chamber (14), a separating body (34) displaceable from the actuation chamber (12) against the busbar (16) by means of an actuator (32), through which separating body a busbar section (42) for severing the busbar (16) at a first predetermined breaking point (76) is displaceable into the arcing chamber (14), and whose separating surface (84) directed towards the busbar (16) in a cross-section along a plane spanned by the main extension direction (Y) of the busbar (16) in the fuse device and the direction of movement (X) of the separating body (34) upon triggering of the actuator (32), in the non- triggered state of the separating body (34) has different distances to the busbar (16),characterized in that the busbar (16) has a second predetermined breaking point (78), wherein the first predetermined breaking point (76) is arranged, viewed in the direction of movement of the separating body (34), opposite a section (86) of the separating surface (84) of the separating body (34) which has the shortest distance to the busbar (16) in the non-triggered state of the separating body (34), wherein the busbar section (42) between the first predetermined breaking point (76) and the second predetermined breaking point (78) in the triggered state, is arranged completely separated from the adjacent busbar sections (80) and displaced into the quenching chamber (14).

2. Fuse device for high-voltage applications according to claim 1, characterized in that the section (86) of the separating surface (84) of the separating body (34), which is arranged opposite the first predetermined breaking point (76) as viewed in the main extension direction (Y) of the busbar (16), is arranged at a first end (82) of the separating body (34) and the distance of the separating surface (84) from the busbar (16) increases in the direction of the opposite second end (88).

3. Safety device for high-voltage applications according to claim 1 or 2, characterized in that the second predetermined breaking point (78) viewed in the main extension direction (Y) of the busbar (16) has a distance (Z) from the separating body (34) in the non-triggered state.

4. Safety device for high-voltage applications according to claim 3, characterized in that the distance (Z) of the second predetermined breaking point (78) to the second end (88) of the separating body (34) viewed in the main direction of extension (Y) of the busbar (16) is greater than the extension of the busbar (16) in the direction of movement (X) of the separating body (34).

5. Safety device for high-voltage applications according to one of the preceding claims, characterized in that a stop is formed in the arcing chamber (14), which, viewed in the main extension direction (Y) of the busbar (16), is arranged between the second predetermined breaking point (78) and the separating body (34) in the extinguishing chamber (14).

6. Safety device for high-voltage applications according to claim 5, characterized in that the distance of the stop from the busbar section (42) to be separated, viewed in the direction of movement (X) of the separating body (34), is less than the extension of the busbar (16) in the direction of movement (X) of the separating body (34).

7. Safety device for high-voltage applications according to claim 5 or 6, characterized in that the stop is formed on a side wall (54) of an extinguishing chamber housing (24) which delimits the extinguishing chamber (14) and surrounds the extinguishing chamber (14).

8. Fuse device for high-voltage applications according to claim 8, characterized in that the distance of a floor (60) of the arcing chamber (14) to the busbar (16) is greater than the busbar section (42) to be severed and a pocket (92) is formed in the arcing chamber (14) which extends between the side wall (54) of the arcing chamber (14) and a side surface (94) of the separating body (34) directed towards the second predetermined breaking point (78) in the triggered state.

9. Fuse device for high-voltage applications according to claim 8, characterized in that the side wall (54) of the arcing chamber (14) delimiting the pocket (92) is formed by an inner wall (56) of the arcing chamber housing (24).

10. Fuse device for high-voltage applications according to claim 9, characterized in that a web (96) extends from the bottom (60) of the arcing chamber housing (24) in the direction of the busbar (16) into the arcing chamber (14), the distance of which web, viewed in the main direction of extent (Y) of the busbar (16), from the inner wall (56) of the arcing chamber housing (24) is greater than the extent of the busbar section (42) to be separated, viewed in the direction of movement (X) of the separating body (34) and is smaller than the existing distance between the separating body (34) and the inner wall (56) of the arcing chamber housing (24) in the triggered state of the separating body (34).

11. Fuse device for high-voltage applications according to one of claims 9 or 10, characterized in that a plurality of ribs (58) arranged next to one another are formed on the inner wall (56) of the arcing chamber housing (24), which extend into the arcing chamber (14).

12. Fuse device for high-voltage applications according to claim 11, characterized in that the ribs (58) are lamellar and extend obliquely in alternating directions into the arcing chamber (14).

13. Safety device for high-voltage applications according to one of the preceding claims, characterized in that the busbar section (42) to be separated is arranged in relation to the adjacent busbar sections (80) in the non-triggered state of the Separating body (34) is arranged offset in the direction of movement (X) of the separating body (34).

14. Safety device for high-voltage applications according to claim 13, characterized in that the offset of the busbar section (42) to be separated from the adjacent busbar sections (80) corresponds to 10% to 60% of the extension of the busbar (16) viewed in the direction of movement of the separating body (34).

15. Safety device for high-voltage applications according to claim 13 or 14, characterized in that in the extension of the busbar section (42) to be severed in the direction of extension Y of the busbar (16) a stop surface (90) is formed, the distance of which from the fixed busbar section (80) adjacent to the second predetermined breaking point (78), viewed in the direction of extension Y of the busbar (16), is smaller than the part of the busbar section (42) to be severed that projects beyond the fixed busbar section (80) in the direction of movement X of the separating body (34).

16. Safety device for high-voltage applications according to claim 15, characterized in that the stop surface (90) is formed on an intermediate housing (26) surrounding the busbar (16).

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