GB2599740A - Pyrotechnic switch and method for operating a pyrotechnic switch - Google Patents

Abstract

A pyrotechnic switch 30 comprises a busbar 10 connected to a first terminal 31 and a second terminal 32, and a movable part or piston 33 which is moved towards the busbar by a pyrotechnic actuator 34. The busbar includes a slot 11. When actuated, the piston may move towards and break the busbar. The piston may hit the busbar in the area of the slot. The cross section of the slot may have the form of a triangle, a half-circle, a circular segment, a U-form, or a rectangle. The depth of the slot may be between 20-80% of the thickness of the busbar. The slot may have a tangent line 23 that is oriented at a non-perpendicular angle α of between 20-70° or 30-60° with respect to a longitudinal centreline 22 of the busbar. The tangent line may alternatively be oriented at a perpendicular angle with respect to the longitudinal centreline of the busbar. The slot may have the form of a straight line, a circular ring element, a U-form, an arrow, or a meander. An edge 35 of the piston may have a complementary shape to the slot.

Description

Description.

Pyrotechnic switch and method for operating a pyrotechnic switch The ad sclosuro is related to a pyrotcchnic owl con and a method for operating a pyrotechnic switch. A pyrotechnic switch includes a first and a second terminal and a busbar that is realized as a conductor and is connected to the first and the second terminal. _A pyrotechnic actuator is able to drive a. movable part towards the busbar for breaking the bust-ax.

Document U12 2019/0184834 Al describes a pyrotechnic switch for breaking and connecting electrical_ circuits. Inc pyrotechnic switch comprises a first and a second electrical conductor. A predetermined disconnection point connects one end of the first electrical conductor to one end of the second electrical conductor. In. a normal operating state of the pyrotechnic switch, currents can flow between the first electrical conductor and the second electrical conductor via the predetermined disconnection point. The pyrotechnic switch. further has a disconnection bolt which can sever the predetermined disconnection point between the first and the second: electrical conductor after the igl tion element is tripped.

It is an object to provide a pyrotechnic 5Wi 2ch and a method for operating a. pyrotechnic switch. w-ith an improved. breaking 30 characteristic.

The obi eel is anhieved by the subject-matter of the independent claims. Further developments are described in the dependent claims.

There is provided a pyrotechnic switch, comprising a first and a second terminal, a bushar connected to the first and the second te=inal, a movable part and a pyrotechnic actuator for moving the movable part towards the busbar. The busbar includes a slot.

Advantageously, the slot results in a weakness of the busbar in a predetermined area. Thus, a breaking of the busbar is achieved with a reproducibility. Advantageously, the busbar is fabricated as a single part. Thus, the busbar has a low and predetermined value of resistance before breaking and can easily be mounted_ In a development of the -0yrotechnic switch, in a first operating state of the pyrotechhic switch, the movable part is apart from the busbar. In a second op crating state of the pyrotechnic switch, the pyrotechnic actuator is configured to move the movable part towards the busbar for breaking the busbar.

In a development, the pyrotechnic switch is configured such that the movable part hits the busbar in the area of the slot. The movable part has e.g. a sharp edge hitting the busbar at the slot or nearby the slot.

In a development of the pyrotechnic switch, the busbar includes a first and a second main side. The slot is located at the first main side of the busbar.. The movable part hits the busbar at the first main side of the busbar. 3 -

Alternatively, the movable part hits the bu sbar at the second main side of the busbar.

In a development of the pyrotechnic switch, a cross-section of the slot has a form of a triangle. The triangle has e.g. a rounded edge at file ground of thc. trlasigle In an alternative development of the pyrotechnic switch, a cross-section of the slot has a form of one of a group comprising a half circle, a circular segment, a H-form and a rectangle. Thus, in the cross-section, the slot has e. a. two side wails and a ground. The rectangle has e.g. rounded edges at the ground of the rectangle. With rounded edges the rectangle is similar to a slot with Tj-form.

In a development of the yrotechnic switch, a depth of the slot is in the range between 201 and GO% of a thickness of the busbar. Alternatively, the depth of the slot is in the range between 40.; and 60* of the thickness of the busbar, In a development of the nvrotechn.ic switch, a width of the busbar has a smaller value than a. length of the busbar. The length. is e.g. the distance of the first terminal to the second term nal.

In a development of the pyrotechnic switch, the busbar has the form of a cuboid. The length is e.g. the-length of the cuboid_ One end of the cuhoid is connected to the first terminal and another end of the cuboid is connected. to the second terminal. The busbar has a first to a fourth edge_ The first and the second edge are longer than the third and the fourth edge. The first and the second edge of the busbar are parallel to each other. The third and the fourth edge of the busbar are connected to the first and the second termAnal.

In an example, the bus-bar is named conductor or pyre, conductor. The busbar is made of metal, e.g. copper.

In a development of. the -0.yrotechhic switch, at least one tangent line of the slot has a non-perpendicular angle to a centre-line of thP hnshar. The centreline may also be named centreline, middle line or midlinp of the busbar. Typically, the tangent line is located at a midline of the slot. In case the slot has the form of a straight line, typically one tangent line exists. In case the slot has the form of a curved line, several tangent lines exist. In case the slot has the form Of a. circulerring element, several tangent lines have a non-perpendicular angle to the centreline. in this case the slot may additionally have a tangent line being perpendicular to the centreline of the busbar.

Advantageously, at least one tangent line of the slot is not perpendThular to the centreline. Therefore, the slot extends along the 'Length of the busbar. This results in a distribution of the resistance caused by the slot along the length of the busbar. Thus, the heat distribution on the busbar is flattened. The non-perpendicular angle of the slot. to the centreline optimizes the cross-section of the busbar which gives a reduced resistance of the busbar.

Advantageously, by having the slot for the break in the busbar at an angle instead of;perpendicular to the busbar allows the cross--sectional area of the busbar be maximized rather than havina a hot spot with the oross-section significantly reduced. at one point. The slot results in a predetermined and desired weakness of the busbar. Thus, the slot. may be named weakness slot, notch or weakness notch. In an example, this does not have an impact on the breaking force needed for breaking of the bushar during switch firing as this is not dependent on the angle of the slot.

In a development -the Tpyrotechilic switch the a.nole of the tangent line with respect to the centreline is in the range between 20' and 70'.

In a development of the pyrotechnic switch, the ancle of the tangent line with respect to the centreline is in the range between 30' and 60'.

an example, the angle i_s 45°.

Advantageously, the by having the slot at an angle the cross-section reduction is not concentrated at one point. Heating due to reduced cross-section is much reduced and also spread along the length of the busbar, In an example, a slight increase of the force to break the hushar may result from the-longer length of the slot in comparison to a slot with perpendicular angle to the centreline. This has only a minimal impact and could be assessed by simulation. A depth of the slot or a length of the slot could be chahged without. much impact to the minimum cross-section.

In a development of the -oyrotechnic switch, a tangent iin, of the slot has a perpendicuLgr angle to the centreline. The slot is perpendicular along the width of the busbar. The tangent line of the slot is perpendicular to the first and the second edge of the busbar. This results in a reduced cross-section. at this position and may result in an increased resistance, power loss and thus i, ncr as sad heat. Advantageously, such a slot can be easily fabricated. Advantageously, an area used for the slot on the busbar is minimized.

In a developmat-of the pyrotechnic switch, the busbar has a main direction. P current flowIng through. the busbar has a main path. The angle discussed in this disclosure can also be determined with respect to the main direction of the husbar, the main path of the current in the busbar or the first edge of the busbar instead of the centreline.

The slot has e.g. a midline. The slot has a first and a second edge formed of the slot and the first main side of the busbar.

In a development of the pyrotechnic switch, the slot is realized as a straight line or approximately as a straight Thus, the slot has one tangent line. The tangent lin.e 20 may be thp mid.line of the slot. The tangent line is parallel to the first and the second edge of the slot.

In an alternative development of the pyrotechnic switch, the slot has a form of a group comprising a circular ring element, a U--form, an arrow and a meander. The tangent line is e.g. a tangent to the midline of the slot. Alternatively, the tangent line is defined as a tangent to the first and the second. edge of the slot.

In case of the slot being an arrow, the slot has at least two tangent lines. In an example, both tangent lines have a non--Perpendicular angle to the centrthne of the busbar.

In a development of the pyrotechnic: switch, the movable part has an edge that is formed such as the slot. The edge is designed to fit to the slot. The edge and the slot have the same orientation. The edge and the slot are parallel to each other. The edge has e.g. a form of a group comprising of a straight lino, approximately a straight linc,aclrcular ring. element, a U-form, an arrow and a meander. For example, the edge hits the slot, in case the movable part hits the busbar at the first main side of the busbar. The edge hits e.g. the area of the slot, in case the movable part hits the busbar at the second main side of the busbar.

In a development of the pyroteohnic. switch, the slot extends from the first edge of the busbar to the second edge of the busbar. Alternatively, the slot has a distance to the first edge and a distance to the second edge.

There is provided a method for operating a pyrotechnic switch. According to the method, in a firs: operating state of the pyrotechnic switch, a movable part is held apart from a busbar. In. a second operating state of the pyrotechnic switch, the pyrotechnic actuator is triggered such that a movable part Hs driven by the pyrotechnic actuator towards the busbar and the movable part breaks the busbar, The busbar includes a slot.

Advantageously, the busbar can be broken at, slot by the movable part. Thus, the breaking is realized with high reproducibility. The second operating state follows the first 30 operating state.

The pyrotechnic switch is particularly suitable for the method for operating a pyrotechnic switch-Features described in connection with the pyrotechnic switch can therefore he used for the method and vice versa, In a development of the method, F tangent line of the slot has a non-perpendicular angle to a centreline of the busbar, hdvantageously, the design LGr the break of the busbar in the pyrotechnic switch reduces resistance and heat by maximizing the cross-sectianal area along the conductor.

In a development, the slot can be realized as slit, notch, groove, recess and/or cut.

In a development, the disclosure is related to an angled slot break pyre. Pyro is the abbreviation for pyro switch or pyrotechnic switch.

The following description of figures of embodiments shall further illustrate and explain aspects of the pyrotechnic switch and the method for operating a pyrotechnic switch.

Parts and components with the same structure and the same effect, respectively, appear wfth equivalent reference symbols. Insofar as parts and components correspond to one another in terms of their function in different figures, the description thereof is not repeated for each of the following.

figures, gurbs lA to it show an exemplary embodiment of a busbar of a pyrotechnic switch; Figures 2A to 2D show a further exemplary embodiment of a busbar of a pyrotechnic switch; Fig res 37 to 3H show alternative exemplary embodiments of a. busbar of a pyrotechnic switch; and Figures 4A to 4C show exemplary embodiments 2 pyro, echnic switch; an Figures kA. and 5B show ket.a iTs i exemplary embodiments of a otechnin switch.

Figures lA to 10 show an exemplary embodiment of a busbar In Figures 1A, fl and lb, cross-sections of the busbar 10 are shown_ Figure IB shows a top view of the busbar 10. As shown. in Figure IA, the busbar 10 has a slot 11. The slot 11 has the form of a triangle in a cross-section. Thus, the slot II has a f1 rat and a. second edge 13, 14 and a middle line 12.

The husbar 10 has a. cuboid form. The lausbar le has a first and a second main side 15, 16. The slot 11 is realized at the first main side 15 or the busbar 10.

In B.aure IB, a top view on the first main side 15 of busbar is illustrated. The busbar 10 includes a first to a fourth edge 17 to 20. The first and the second edge 17, 18 form longer sides of the busbar 40. The third and the fourth edge 19, 20 form shorter sides of the busbar 10. The first and the second. edge 17, 18 are longer than the third and the fourth edge 19, 20. The third edge 19 is connected to a first terminal 31 of a pyrotechnic switch. 30 (shown in Figures 4A to 4C, 5A and 5B). Correspondingly, the fourth edge 20 is connected to a second terminal 32 of the pyrotechnic switch 30, The busbar 10 is made out of metal, for example copper. A metallic conductor of the busbar 10 continues at the third and the fourth edge 19, 20 until the metallic conductor reaches the first and the second terminal 31, 32. The busbar has a centreline 22. In. the example shown in Figure 1B, the busbar 10 is syrmibltrjc with respect to the centreline 22 in a top view. The busbar 10 has a length 7 and a width TR, wherein I > W. h. tangent 1 no 23 can be drawn at the slot. 11, In this example the tangent line 23 is located on. the middle line 12 of the slot 11. The tangent line 23 forms an angle a to the centreline 22. in the example shown in Figures IA to 11, the angle a is 90°.

in Figure 1C, a cross-section of the busbar 10, for example near the fourth edge 20, is shown. In Figure 1D, a cfosssection of the busbar 10 In the slot 11 is shown. The slot II has a depth Du The ha Soar 10 has a thickness T. In Figure 1D, the area of the cf-oss-section at the smallest point is shown.

Figures 2A to 21 show a further exemplary embodiment of a busbar 10 which is a faxthbr development, of the embodimsnt shown. in Figures IA to ID. As illustrated. in Figure 2B, the slot 11 is not perpendicular to the centreline 22. The slot 11 has the angle a towards the centreline 22. The tangent line 23 has the angle a towards the centreline 22. The angle a is different from 90°. In the example shown in Figure 213, the angle a has approximately the value of 60°. Alternatively, the angle a has approximately the value of 45° or another value.

In Figure 2D, the area of the eross-oection at the smallest point is shown. In the upper part of Figure 20, a cross-section of the bushar 10 is shown at the location at which the slot 11 is in contact with the second edge 18. In the lower part of: Figurb 2D, a cross-section of the busbar 10 1 shown in w.hrh the slot 11 is cetween the first anb the second edge 17, 12, A redbced cross-section results in an increase of the resistance at this point of the busbar 10. The locations with the increased resistance are distributed along the length of the husbar 10. Thus, a heat generation is also distributed along the length of the buabar 10.

Therefore, hotspots are avoided.

Figure 3A shows an alternative exemplary embodiment of a buhbar fu which is a further development of the embodiments shown above. The buobar 10 commrises the slot 11 and a further slot 11'. The further slot 11' is realized such as the slot II. Thus, the further slot 11' has a further first edge 13', a further second edge 11' and a further middle line 12'. A. further tangent ljne 23' can be drawn at the further slot 11'. The further tangent line 23' is identical or nearly. identical to the further middle line 12' of the further slot. 11'. The tangent line 23 and the further tangent line 23' have the same angle a towards the centrelino 22.

In an alternative embodiment, no shown, the angle a' of the further tangent line 23' towards the centreline 22 is different from the angle a of the tangent line 23 towards the centrthne 22.

In an alternative, not shown embodiment, the angle a' of the further tangent lino 23' and the angle a of the tangent lino 23 are 900.

Figure 3B shows an alternative exemplary embodiment of a bustar 10 which is a further development of the embodiments shown above. The slot 11 is realized in the form of an arreav.m Thus, a tangent 1ine 23 and a fug-titer tarlge.nt 1ine 23] can be drawn at the slot 11. The tangent line has an angle a towarc the centrelino 22 and the further tangent lino 23' has a. further angle a' towards the centreline 22. Both angles a, a' are e.g. identical. Alternatively, the angles a, a' are e.g. different.

Figure 30 shows a far* her aiternotive embodiment of a bus bar 10 which is a further development of the above-shown embodiments. The slot 11 has the form of a circular ring element. Thus, the middle lino 12 of the slot 11 has the form of a part of a circle. Therefore, different tangent lines 23, 23' can be drawo at the middle line 12. One tangent line, not shown, in Figure 30 has an angle a that is equal to 90° to the centreline 22. However, most of the tangent lines 23, 23' which. can. be d.rawn at the ifiddie line 12 have an angle a which is different from 90° towards the centreline 22. Thus, there is at least one tangent line 23 that has a non-perpendicular angle a to the centreline 22. In the example shown in Figure 30, the tangent lines 23 and the further tangent lines 23' are shown.

Figure 3D and 3F show further exemplary embodiments of a busbar 10 which is a further development of the above-shown embodiments. As shown in Figure 3D and 3E, the slot 11 has a form of a. meander in a top view.

Figure 3F shows a further e emolarv embodiment of a busbar 10 which. is a further development of the above-shown embodiments. As shown in Figure 3F, the slot 11 has a form of 30 a rectangle in a cross-section.

Figure 30 shows a further exemnJary embodiment of a busbar 10 which is a further development of the above-shown.

embodiments. As shown in Figure 3G, the slot:1 has a form of a. half circle in a cross-section. Alternatively, the slot has e.g. a U-form in a cross ---section.

F, Figure 311 shows a further exemplary embodiment of a busbar 10 which is a further development of the above-shown embodiments. The busbar 10 has rounded corners. The slot 11 has the form_ of a straight. lire. Due to the chosen dimensions, the middle line 12, the first edge 13 and the seconb. edge 14 are not shown. An angle is defined as angle between the slot 11 and a straight line that perpendicular to the first and the second edge 17, 18. The angle 13 has the value of 45'. The centerline 22 and the first and the second edge 17, 18 are parallel to each other. The angle a can be calculated as a = 90' - = 45'. The pyrotechnic switch 30 comprises the first and the second terminal 31, 32. In this example, the first and the second terminal 31, 32 are realized as omenings of the busbar 10. The omenings may have the form of circles. In Figure 3H, a busbar or conductor connection arrangement is illustrated_ Figures 4A_ to 4C show exemplary embodiments of a pyrotechnic switch. 30 with a bubar 10 which is a. further development of the above-shbwm. embodiments. In Figures 4A and 43, embodiments of the pyrotechnic switch 30 are shown before break of the busbar 10 and in Figure 40, an embodiment of the pyrotbchnic switch 30 is shown after break of the busbar 10. The pyrotechnic switch 30 comprises the first and the second terminal 31, 32. The busb.ar 10 is connectec. to the first and the second terminal 31, 32. In the examples shown in Figures 4A to 40, the first and the second terminal 31, 32 are realized as holes, cutouts or apertures of the busbar 10. Moreover, the pyrotechnic switch. 30 inc. ] udes a movable part --14 33 and a pyrotechnic irtuator 34. The movable part 33 comprises an edge 35. The edge 35 arranged in a distance to the busbar 10 before breaking the busbar 10. The pyrotechnic actuator 34 is configured for moving the movable part 33 towards the busbar 10. The edge 35 is that part of the movable part 33 that hits the busbar 10 first after ignition of the pyrotechnic actuator 34.

Additionally, the pyrotechnic. switch 30 comprises a first part and a second part 37, 38 of a housing. The pyrotechnic actuator 34 and the movable part 33 are arranged in the first part 37 of the housing. A gasket 40 of the pyrotechnic switch. 30 provides a seal between the first part 37 of the housing and the movable part 33. A first gasket 41 is arranged between the first part 37 of the housing and the busbar 16. A. second gasket 42 is located between the second part 38 of the housing and the busbar 10.

As shown in Figure 4A, the movable part 33 is adjacent to the 20 second main side 16 of the busbar 10; thus, the slot 11 (which can be named notch) is on a bottom side of the busbar 10 (which. can be named conductor). According to Figure 45, the movable part 33 is adjacent to the first main side 15 of the busbar 0; thus, the slot 11 is at a top side of the busbar 10. The pyrotechnic switch 30 is at normal condition in Figures 4A and 45: The pyrotechnic switch 30 is able to conduct current between the first and the second. terminal 31, 32, As shown in Figure 4C, after ignition of the pyrotechnic actuator 34, the edge 35 hits the busbar 10 and destroys the busbar 10 in the area of the slot 11. Thus, the busbar 10 is interrupted. There is no electrical. connection from the first e JoT regEng BIAS JO 00TJIPOCT SfPBM pBUTISI8148p940 P UT E.-I1-Lu28:1: TT 4018 874 @curs -0T rugsnq 874 rHo 81044014 SP Si TT goTs DUS eaLLTa up speleum 10T Iegsnq DUS. 40 dOS U0 sr TT;ors 844 irir; aanErA uT.(sc aInbrA TIT umoris! 4ou 5E TT 4019 e144 OTT es' apTs uTerd 511111 14 0140c45-40u au uo sT 11 goTs 5144 Bourg) eaed 9415 TT goTs arlq pue SE efts 8141, 'TT 0T9 8144 9PLIT2m074 poquoTro sr 2(2 40ed GrquAcal 8144 lo ofria au; 'oseJ 5874 uT osTri °0T recisnq au; 40 91 apTs U112111 14810002 874 spaemo4 paThrerro sT gaud 91142810111 a144 lucr 90r141514 UT peuepronra Ski Cl cc arquAom 0-4-4 spremog poquaTio 9T OT -112cfsnq 841 Jo cirL dP19 uT2m 4911Jaur4 "wg aanbul ui.TT -40T5 0114 54784 SE abPe 8g4 10 BUTT 44151=45 004115144085 :11811408 300A14 874 40 uoT4T0b1 08448? °or ar2ggng 344 40 9ur4 4u9bLe49144 04 1 11p:red sr gc 944 40 9u7r7T 14TLIbT204E; 9r11 'TT 401 s 9Irg 40 BUTT 40Teigs115144su IrDns Pe4uaTa0 Si Cj 3508 374 Jo BUTT 4715T2D0r45 ow, -BUTT 475T814s u;o 01100; 374:7-3E7 sE ebpe agl -uoTguqueTro @MPS 874 OASU TT 4oTs 8141. pue sE 90149 9144.Ir -loT2 9u4 Jo mroj au seq T 1.? 24 Grcresrour 97; Jo* abpe eq4 eaubTrL uT umoris.s4uamTprogiala umcrqg BAOCIP 31411, 40 squendoTeAop 08144081zr_ 3015 LIDTgm oc 734rms DTUTUST43047:d e To s4u9turmoo1.u9 A1e1dm909 ro 541re49p MOUS Es pup vri: s9anbr4 0T rugsnq au 30 buTgparg CT 0844E swioz prpuTmiB4opeT"d 0241584 or sugsng 874 40 54012d 0144 erg isnru.TT 4041 arig 4e 511111900 oT reqsng dq4 40 buTgparq au' .pesearpur sr oT aeqsng 81414 buTrtearg Jur AnJTrgeTraa 074 pur? parr pa ST oT aerrirrnq burTrrrpirl 50rT 03003 0814 40Ts 3LT4 fuTPTA03-d A:01 Tsnoebequenpv -uor;rpuoc T_F-2-en 00/puu aTnu; bufluBT9 gsod uor4rs0d P UT UMOTTS Si cc 0041145 9ru8Irpa401A14 au '01-7 earrbrr uT cc 4apd aTriPAorn aurt ro 114 445 811411 pue L,E 2014 9041)9 orurrpawrAd au To uorgrubT 2.824-5;:rr 4e8111110:94 puopos aqr 011. 0T rpgsng 3144 551.0TP r881111284 reliable operation of rite pyrotechnic switch JO is achieved In an. example, the busbax 10 is a sing-le part or single piece before breaking. In an example, the busbar 10 consists of exactly one part before breaking. in an example, the busbar r--, 10 is broken into two parts or two pieces by the breaking of the husbar 10. in an example, thc number of parts of. the busbar 10 increas(as by the breaking of the busbax 10.

The embodiments shown in Figures IA to SE as stated represent il) examples -the improved pyrotechnic switch; therefore, they do not constitute a. complete list of all embodiments according to the improved p*yroteohn o switch. Actual pyrotechnic switches may vary from the embodiments shown in terms of parts, structures and shape, for examLje.

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Reference numerals busbar slot i'D1.^..f middle line 13, 13' first edge 14, 14' second edge first main side 16 second main side 17 to 20 edge 22 centreline 23, 23' tangent line pyrotechnic switch 31 first terminal 32 second. terminal 33 movable part 34 pyrotechnic actuator edge 37, 38 part of the housing 40 to 42 gasket a, a! angle depth length T thickness W width

Claims (2)

1. Claims Pyrotechnic switch (30), comprising: - a first and a second terminal (31, 32), -a husbar (10) connected to the first and the second terminal (31, 32), - a movable part (33), and - a pyrotechnic actuator (34) for moving the movable part towards the busdbar (10), II) wherein the busbax (10) includes a slot (11).
2. 2 Pyrotechnic switch (30) of claim 1, wherein in a first operating state of the pyrotechnic switch (30), 1--'"P movable part (33) is apart from the busbar (10), and wherein in a second operating state of the pyrotechnic wtch (30), the pyrotechnic actuator (30) is configured to move the movable part (33) towards the busbar (10) for breaking the busbar 3. Pyrotechnic switch (30) Jim 1 or 2, wherein the pyrotechnic switch (30) is configured such that the movable part (33) hits the busbar (10) in the area of the slot (11), 4. Pyrotechnic switch (30) of one of claims 1 to 3, wherein a cross-section of the slot (11) has a form of a triangle.5. Pyrotechnic switch (30) of one of claims 1 to 3, wherein a cross-section of the slot (11) has a tom of one of a group corasine a half circle, a ciiddslar segment, a form and a rectangle.6. Pyrotechnic switch (30) of one of claims 1 to 5, wherein a depth (D) of the slot (11) is in the range between 200 and 801 of a thickness (I) of the busbar (10).7. Pyrotechnic switch (30) of onc of claims 1 cc 6, wherein at least one tangent line (23) of the slot (11) has a non-perpendicular angle to a centreline (16) of the busbar (10).8. Pyrotechnic switch (30) of claim 7, wherein the angle (a) of the tangent. line (23) with respect to the centreline (10) is in the range between 20' and 70'.9. Pyrotechnic switch. (30) f claim wherein the angle (a) of the tangent line (23) with respect to the centreline (18) is in the range between 30' and 60'.10. Pyrotechnic switch (30) of one of claims. 1 to 20 wherein a tangent line (23) of the slot (11) has a perpendicular angle (a) to the centreline (18).11, Pyrotechnic. switch (30) of one of claims I to 10, wherein the slot (11) is realized as a straight line or 25 approxsmatei p as a straight line, 12, Pyrotechnic switch (30) of one of claims 1 to 10, wherein the slot. (11) has a form of a. group comprising a circular ring element, a CJ-form, an arrow and a meander.13. Pyrotechnic switch (30) of one of claims 1 to 12, wherein the movable part (33) has an edge (35) that is formed such as the slot (11).11, Method for operating a pyrotechnic switch. (30 comprising - in a first operating state of the pyrotechnic switch (30), 5 holding a movable part (33) apart from a bus-bar (.1O), and -in a sccone operating state of the pyrotechnic bwitce (30) triggering the pyrotechnic actuator (34) such that the movable part (33) is driven by the pyrotechnic actuator (34) towards the husbar (10) and the movable part (33) breaks the 10 busbax (10), wherein the busbar (10) includes a slot 11).