Mounting rail assembly with a bus system and an electronic device comprising a printed circuit board

Abstract

Mounting rail assembly, with - a support rail (2), - a bus element (3) of a rail bus system arranged on the support rail (2) and having at least one electrical contact element (4) and - an electronic device (1) attachable to the mounting rail (2), which has a housing (10) and a printed circuit board (11) arranged therein with at least one contact field (110) for electrical contacting with the at least one electrical contact element (4) of the bus element (3), wherein in a position of the electronic device (1) attached to the mounting rail (2) the at least one contact field (110) of the printed circuit board (11) is electrically contacted with the at least one contact element (4) of the bus element (3), wherein the bus element (3) has a first guide element (31) and the printed circuit board (11) has a second guide element (113), wherein when the electronic device (1) is attached to the mounting rail (2) the first guide element (31) of the bus element (3) comes into contact with the second guide element (113) of the printed circuit board (11) and slides along the second guide element (113) to guide the printed circuit board (11) relative to the bus element (3), characterized by the fact that the second guide element is formed by a guide edge (113) of the circuit board (11) and the guide edge (113) is formed on a recess (112) formed in the circuit board (11).

Description

[0001] The invention relates to a support rail assembly according to the preamble of claim 1.

[0002] Such a mounting rail assembly comprises a mounting rail, a bus element of a mounting rail bus system arranged on the mounting rail and having at least one electrical contact element, and an electronic device attachable to the mounting rail. The electronic device has a housing and a printed circuit board arranged therein, with at least one contact field for electrical contact with the at least one electrical contact element of the bus element. In a position of the electronic device attached to the mounting rail, the at least one contact field of the printed circuit board is electrically contacted with the at least one contact element of the bus element.

[0003] A mounting rail can be used, for example, to support various electrical devices, such as electronic devices that perform a control and / or evaluation function, or electrically connecting devices like terminal blocks or similar components. Electrical devices can be combined modularly on a mounting rail to provide electrical functions, for example, within an industrial plant.

[0004] A mounting rail of this type can be equipped with a mounting rail bus system that establishes an electrical connection between electrical devices mounted on the rail. This allows signals, such as control signals, to be exchanged between the electrical devices and also provides them with a power supply. Such a mounting rail bus system is created by bus elements that are inserted into the mounting rail and each have, for example, a plurality of contact elements through which electrical contact with electrical devices mounted on the mounting rail can be established.

[0005] An electronic device comprises a printed circuit board (PCB) on which, for example, electrical and electronic components are arranged to provide electrical and electronic functions, such as control and automation functions. When such an electronic device is mounted on the DIN rail, the PCB should make electrical contact with contact elements of a bus element via contact pads arranged on the PCB, thus electrically connecting the electronic device to the DIN rail bus system. This should ideally occur automatically when the electronic device is mounted on the DIN rail.

[0006] To mount an electronic device to a mounting rail, the device is positioned against the rail using, for example, a pivoting edge of a mounting device. The device is then pivoted towards the rail, locking it in place. This action also electrically connects a circuit board within the device to a bus element of the mounting rail bus system. As the device pivots relative to the rail, the circuit board is brought into electrical contact with the bus element's contact points, thus electrically aligning the circuit board's contact fields with those of the bus element.

[0007] There is a need to increase the number of contact elements per bus element, which necessitates reducing the size of the contact elements. In particular, it is desirable to use contact elements that extend horizontally along a plane and thus require minimal installation space along a normal direction perpendicular to the plane. However, increasing the number of contact elements on the bus element side simultaneously requires reducing the size of the contact pads on the printed circuit board (PCB). This necessitates precise alignment of the PCB with the bus element's contact elements to ensure reliable contact between the bus element and the PCB's contact pads.

[0008] It should be taken into account that although the circuit board is usually fixed inside the housing of the electronic device and is moved together with the housing when the electronic device is attached to the mounting rail, tolerances in the fastening between the housing and the circuit board may exist.

[0009] Mounting rail assemblies of the type in question are known from DE 20 2006 006 659 U1. According to this, the bus element has a first guide element and the printed circuit board a second guide element, wherein when the electronic device is attached to the mounting rail, the first guide element of the bus element comes into contact with the second guide element of the printed circuit board and slides along the second guide element in order to guide the printed circuit board relative to the bus element.

[0010] The object of the present invention is to provide a mounting rail assembly that enables a reliable attachment of an electronic device with a printed circuit board arranged in a housing to a bus element of a mounting rail bus system on a mounting rail.

[0011] This problem is solved by an object having the features of claim 1.

[0012] To solve this problem, a direct guide for the printed circuit board (PCB) relative to the bus element is provided. For this purpose, the bus element has a (first) guide element, and the PCB has a (second) guide element. These elements interact when the electronic device is attached to the mounting rail, guiding the PCB along the bus element. As the electronic device is attached to the mounting rail, the guide elements slide against each other, ensuring that the PCB is guided in a defined manner relative to the bus element and engages with it.

[0013] This allows the bus element's contact elements to slide onto the corresponding contact fields on the circuit board in a defined manner, thus reliably establishing an electrical connection between the bus element's contact elements and the circuit board's contact fields. In particular, this prevents the bus element's contact elements from coming into contact with the circuit board next to their corresponding contact fields when the electronic device is attached, which could potentially lead to insufficient contact.

[0014] The second guide element of the printed circuit board (PCB) is formed by a guide edge of the PCB, which is molded into the PCB as a recess. This recess can, for example, be milled, and the guide edge can define one side of this recess. When the electronic device is attached to the mounting rail, the (first) guide element of the bus element comes into contact with the (second) guide element in the form of the guide edge of the PCB, so that the PCB is guided directly by the bus element and thus, when attached, travels a defined path relative to the bus element.

[0015] Because the provided guide between the circuit board and the bus element enables precise positioning of the circuit board against the bus element, it is possible to use smaller contact elements and thus an increased number of contact elements on a bus element.

[0016] In principle, the electronic device can be attached to the mounting rail in any way. Due to the guide elements provided on the bus element on one side and on the circuit board on the other, the electronic device is guided relative to the mounting rail, at least at the end of the attachment process, and thus engages with the mounting rail and the bus element attached to it in a defined manner.

[0017] In an advantageous embodiment, the housing of the electronic device can include a mounting device for attaching the electronic device to the mounting rail. For this purpose, the mounting device can be attached to the mounting rail via a pivoting edge, allowing the electronic device to be pivoted around this edge in a pivoting direction towards the mounting rail and thus secured to the mounting rail. The mounting device can, for example, have a locking edge opposite the pivoting edge, wherein the pivoting edge engages a first flange on a first leg of the mounting rail, while the locking edge engages a second flange on a second leg opposite the first leg.

[0018] In contrast, the (first) guide element of the bus element can, for example, have a guide surface over which, when the electronic device is attached to the mounting rail, the (first) guide element slides into contact with the (second) guide element of the printed circuit board. The guide element can, for example, be arranged between legs of a connecting section of the bus element and be shaped such that, when the printed circuit board is attached to the bus element, it engages with the recess and slides with its guide surface along the guide edge of the recess.

[0019] Opposite the guide surface, the guide element can have a contact surface which, when the circuit board is attached, is in contact with a contact edge opposite the guide edge on the recess of the circuit board, so that when the circuit board is inserted into the bus element, the circuit board assumes a defined position on the bus element.

[0020] Each contact element of the bus element can, for example, have a contact body extending planarly along a plane and at least one contact leg projecting from the contact body and extending along the plane for contacting an associated contact field of the printed circuit board. The contact element is preferably planar and extends in the plane, thus requiring little space when viewed along a normal direction perpendicular to the plane.

[0021] It can be provided that – measured perpendicular to the plane of extension – the contact body has a first thickness and at least one contact leg has a second thickness that is smaller than the first. The contact element extends flat along the plane of extension and can, for example, be formed in one piece, so that one or more contact legs are integrally connected to and extended from the contact body. Electrical contact with the contact fields of the printed circuit board is established via the contact legs. To adjust the elasticity of the contact legs, which, like the contact body, extend flat along the plane of extension, the thickness of the contact legs is adjusted relative to the contact body to achieve the desired elasticity.

[0022] The elasticity of the contact legs is increased by reducing their thickness compared to the contact body. This allows the printed circuit board (PCB) to be reliably inserted, for example, into a contact fork formed by two contact legs – with elastic deformation of the contact legs – on the bus element side. The elasticity of the contact legs is such that they can deflect sufficiently when the PCB is inserted without (plastic) bending or breakage. Furthermore, when the PCB is inserted, the contact legs exert sufficient pressure on the corresponding contact fields of the PCB, ensuring reliable electrical contact.

[0023] Different designs of the contact element are conceivable.

[0024] In one variant, the contact element can be designed as a sheet metal stamping part extending flat along the plane of its extension. The contact element is thus manufactured as a single stamped piece and extends flat along the plane of its extension without any bent sections protruding from it. The thickness of at least one contact leg can, for example, be adjusted by an embossing process, in which the contact leg is embossed to a specific thickness that is reduced compared to the contact body.

[0025] For example, the thickness of the contact body can be in a range between 0.5 mm and 1 mm, for example 0.6 mm. The thickness of at least one contact leg, on the other hand, can be in a range between 0.2 mm and 0.8 mm, for example 0.4 mm.

[0026] In a second variant, the contact element can be designed as a folded, stamped metal sheet part. This contact element is again flat along its plane of extension, but in this case, it consists of two folded halves that are folded towards each other around a fold line in such a way that the folded surfaces lie flat against each other, at least in sections, and together form the contact body. In this way, the material thickness can be doubled, particularly in the area of ​​the contact body, by folding the folded surfaces over each other in this area. At least one contact leg is formed by only one folded surface, so that only a single material thickness is present in the area of ​​the contact leg.

[0027] To manufacture the contact element according to the second variant, it can first be produced as a stamped element with adjoining, flat folding surfaces extending along the plane of its extension. After stamping, the folding surfaces are folded together around the fold line to complete the contact element.

[0028] The contact element has, for example, one or more contact legs that are elastically deformable relative to the contact body to enable reliable attachment of one or more printed circuit boards (PCBs). Two contact legs can together form a contact fork into which an associated PCB with its attached contact fields for electrical contact can be inserted. Upon insertion, the contact legs deform elastically in the plane of extension and, after the PCB is inserted, bear against the contact fields of the PCB under elastic preload (with a force direction running in the plane of extension).

[0029] It is conceivable and possible that one or both contact legs of the contact fork have a (second) thickness that is less than the (first) thickness of the contact body. It may be sufficient for only one of the contact legs to have a reduced thickness to provide increased elasticity at that contact leg. However, it is equally conceivable, possible, and potentially advantageous for both contact legs of a contact fork to have a reduced thickness compared to the contact body.

[0030] In a specific embodiment, the contact element can also have multiple contact forks, for example, two contact forks, each with a pair of contact legs. In this way, for example, several printed circuit boards can be electrically contacted with the contact element. The contact forks can protrude from the contact body in the same direction. However, it is also conceivable and possible for contact forks to protrude from the contact body in different directions. For example, a first contact fork can enable electrical contact with a printed circuit board and, for this purpose, protrude from the contact body along a vertical direction. A second contact fork, on the other hand, can enable electrical contact with a contact element of another bus element and, for this purpose, protrude from the contact body along a horizontal direction perpendicular to the vertical direction.

[0031] To form the rail bus system, a multiple bus elements can be arranged in a row along a horizontal direction. For this purpose, the contact elements of each bus element can each have a contact fork on one side and a contact pin on the other, which protrude from the contact body on different sides along the horizontal direction, so that a contact element of a first bus element, for example, can be inserted with its contact pin into a contact fork of a contact element of a subsequent, second bus element for electrical contact.

[0032] The concept underlying the invention will be explained in more detail below with reference to the exemplary embodiments illustrated in the figures. They show: Fig. 1 a schematic view of an electronic device to be mounted on a mounting rail; Fig. 2A a partial sectional view of an electronic device when attached to a mounting rail; Fig. 2B a partial sectional view of the electronic device in the position attached to the mounting rail; Fig. 3A, Fig. 3B Perspective views of a bus element of a rail bus system; Fig. 4A a side view of a contact element of a bus element; Fig. 4B a front view of the contact element; Fig. 4C a top view of the contact element; and Fig. 5 a perspective view of another embodiment of a contact element.

[0033] Fig. Figure 1 shows a schematic view of an electronic device 1, comprising a housing 10 and a circuit board 11 arranged therein (see Fig. 2A and Fig. 2B) and may, for example, be designed to perform control and / or automation functions within an industrial plant.

[0034] The electronic device 1 can be attached to a mounting rail 2 in the form of a DIN rail on the underside of the housing 10 via a fastening device 100 and combined with other electrical or electronic devices, for example to provide an electrical system created by modular assemblies within a control cabinet.

[0035] To attach the electronic device 1 to the mounting rail 2, the housing 10 of the electronic device 1 can be attached to a lateral flange 23 on a leg 21 of the mounting rail 2 with a pivoting edge 101 of the fastening device 100 and pivoted around this pivoting edge 101 in a pivoting direction S towards the mounting rail 2, until a locking edge 102 opposite the pivoting edge 101 locks with a flange 24 on a leg 22 of the mounting rail 2 opposite the leg 21 and the electronic device 1 is thus positively locked to the mounting rail 2.

[0036] The mounting rail 2 has a U-shaped cross-section, with a base 20 and opposing legs 21, 22, to each of which a flange 23, 24 is attached. By engaging the side flanges 23, 24, the housing 10 of the electronic device 1 is positively connected to the mounting rail 2 and thus secured to the mounting rail 2.

[0037] Within a space created between the legs 21, 22 of the mounting rail 2, bus elements 3, 3' of a mounting rail bus system are arranged, enabling an electrical connection between different electrical and electronic devices mounted on the mounting rail 2. For this purpose, bus elements 3 have an upwardly projecting contact section 30 into which the circuit board 11 of the electronic device 1, arranged in the housing 10, can be inserted to establish electrical contact with the mounting rail bus system. The bus elements 3 are connected to each other, for example, via intermediate elements 3', and can be combined modularly to provide a modular mounting rail bus system.

[0038] Fig. 2A, Fig. 2B and Fig. 3A, Fig. Figure 3B shows a specific embodiment of a bus element 3 to which an electronic device 1 with a printed circuit board 11 can be electrically connected. Fig. 2A and Fig. Figure 2B shows the electronic device 1 being connected to the bus element 3, while Fig. 3A, Fig. 3B shows separate perspective views of bus element 3.

[0039] The bus element 3 has a plurality of contact elements 4 spaced apart from each other along a transverse direction Y, each extending in a plane E, which serve to contact contact fields 110 of the printed circuit board 11. The plane E is spanned by a horizontal direction X and a vertical direction Z, with the planar contact elements 4 extending in parallel planes to each other.

[0040] Examples of contact elements 4 are shown Fig. 4A to 4C and Fig. 5. Each contact element 4 has a contact body 40 and extending contact legs 42, 410, 430, which serve for electrical contacting with other contact elements (contact pin 42 and a contact fork 41 formed by the contact legs 410) or for electrical contacting with associated contact fields 110 of the printed circuit board 11 (a contact fork 43 formed by the contact legs 430).

[0041] Both in the embodiment according to Fig. 4A to 4C as well as in the embodiment according to Fig. In section 5, the contact element 4 is designed as a one-piece sheet metal part. The contact legs 410 of the contact fork 41 and the contact pin 42 extend to different sides along the horizontal direction X of the contact body 40 to establish electrical contact with other contact elements 4 of other bus elements 3, 3'. The contact pin 42 rests in an associated contact pin 321 on a body 32 of the bus element 3, while the contact fork 41 is accessible via contact openings 322 on a rear side of the body 32 facing away from the contact pin 321.

[0042] In contrast, the contact fork 43 formed by the contact legs 430 projects along the vertical direction Z from the contact body 40 and extends into the contacting section 30 formed by two legs 300, 301. The circuit board 11 of the electronic device 1, with contact fields 110 arranged on it, can be inserted between the contact legs 430 of the contact fork 43, so that electrical contact can be made between the contact element 4 with associated contact fields 110 of the circuit board 11 via the contact legs 430.

[0043] Legs 300, 301 are spaced apart from each other along the horizontal direction X and form a gap into which the circuit board 11 can be inserted. Each contact leg 430 of the contact fork 43 is received on a leg 300, 301, so that by inserting the circuit board 11 between the legs 300, 301, the circuit board 11 is inserted between the contact legs 430 of the contact forks 43 of the different contact elements 4 arranged on the bus element 3.

[0044] The circuit board 11 has a plurality of contact fields 110, with congruent contact fields 110 arranged on both sides of the circuit board 11, forming pairs of contact fields 110, each of which is assigned to a contact element 4. The assigned pair of contact fields 110 is thus contacted on both sides via the contact legs 430 of a contact fork 43.

[0045] In a modified embodiment, it is also possible to arrange contact fields 110 on only one side of the circuit board, so that each contact fork 43 is assigned only one contact field 110.

[0046] Reliable contact with the associated contact fields 110 of the printed circuit board 11 is to be achieved via the contact legs 430 of the contact fork 43. For this purpose, the contact legs 430 are elastically deformable in the plane E of the contact element 4, so that when a printed circuit board 11 is inserted between the contact legs 430 of the contact fork 43, the contact legs 430 can elastically deflect in the plane E and, with the printed circuit board 11 inserted, bear against the associated contact fields 110 of the printed circuit board 11 with sufficient contact force to establish reliable electrical contact.

[0047] To adjust the elasticity of the contact legs 430, the thickness D2 of the contact legs 430 is reduced compared to the thickness D1 of the contact body 40, so that the elasticity of the contact legs 430 is increased compared to the contact body 40 (the elasticity of the contact legs 430 in the extension plane E is determined on the one hand by the planar extension of the contact legs 430 in this extension plane E, on the other hand by the material thickness, and on the third hand by the material properties; with the same surface shape, the elasticity is increased with reduced material thickness).

[0048] Reducing the thickness D2 of the contact legs 430 compared to the thickness D1 of the contact body 40 allows for an increase in elasticity, particularly without changing the surface shape of the contact legs 430. (Alternatively, the elasticity of the contact legs 430 could be adjusted, for example, by lengthening them, but this would require more installation space.)

[0049] The reduced material thickness of the contact legs 430 can be achieved in different ways.

[0050] Thus, in the exemplary embodiment according to Fig. 4A to 4C, the material thickness of the contact legs 430 is reduced relative to the contact body 40 by subjecting the contact legs 430 to an additional embossing process, in which the material thickness of the contact legs 430 is reduced by embossing. In the embodiment according to Fig. In parts 4A to 4C, the contact element 4 is designed as a stamped metal sheet part. After the contact element 4 is manufactured by stamping, the contact legs 430 undergo an additional embossing process, and in this way the thickness D2 of the contact legs 430 is adjusted as desired.

[0051] In the embodiment according to Fig. In contrast, contact element 4 is designed as a folded sheet metal stamping part. Contact element 4 – which is in Fig. Figure 5, shown after punching but before folding, has folded halves 4A and 4B which are folded together along a fold line L. This doubles the material thickness of the contact element 4 in the area of ​​the contact body 40 and in the area of ​​the contact pin 42, as well as in the area of ​​the contact legs 410, so that after folding the contact legs 430 of the contact fork 43 have a reduced material thickness, especially compared to the contact body 40.

[0052] In the embodiment according to Fig. In parts 4A to 4C, the contact legs 410 of the contact fork 41, as well as the contact legs 430 of the contact fork 43, have a reduced thickness D2. For this purpose, the contact legs 410, advantageously together with the contact legs 430, are subjected to an additional embossing process to achieve the reduced thickness D2.

[0053] In the initial example according to Fig. 5 is the material thickness of the contact legs 410 of the contact fork 41, which is doubled by the two folding halves 4A, 4B.

[0054] The contact elements 4 are part of the bus element 3 and serve for electrical contact with other bus elements 3, 3' and also for electrical contact with the circuit board 11 of an electronic device 1. The bus element 3 is fixed to the mounting rail 2 by means of fastening elements 320 in the form of locking elements projecting laterally from the body 32, in that the body 32 lies in the space of the mounting rail 2 formed between the legs 21, 22 and the fastening elements 120 engage the lateral flanges 23, 24 on the legs 21, 22 and thus hold the bus element 3 positively on the mounting rail 2.

[0055] To attach the electronic device 1 to the mounting rail 2, the housing 10 of the electronic device 1 is aligned with the pivot edge 101 of the mounting device 100, as shown in Fig. 2A, is attached to the side flange 23 of the mounting rail 2 and pivoted in the pivoting direction S towards the mounting rail 2 until the opposite locking edge 102 engages with the flange 24 and the electronic device 1 is thus, as shown in Fig. 2B is shown, positively locked to the support rail 2.

[0056] When the electronic device 1 is pivoted in the pivot direction S towards the mounting rail 2, the circuit board 11 is inserted between the legs 300, 301 of the contact section 30 of the bus element 3. The circuit board 11 is positively secured within the housing 10 of the electronic device 1 via fastening points 111 and is therefore pivoted together with the housing 10 when the housing 10 is pivoted.

[0057] When the printed circuit board 11 is inserted into the contacting section 30 by pivoting the housing 10, the contact legs 430 of the contact forks 43 of the individual contact elements 4 slide onto the respective associated contact fields 110 on the printed circuit board 11. This occurs with (slight) elastic deformation of the contact legs 430, particularly in the plane of extension E, so that, when the printed circuit board 11 is fully inserted, the contact legs 430 bear against the associated contact fields 110 of the printed circuit board 11 under elastic preload.

[0058] Because the contact elements 4 and the contact fields 110 have comparatively small dimensions, especially along the transverse direction Y, guide elements 31, 112 are provided on the side of the circuit board 11 and on the side of the bus element 3. These guide elements provide direct guidance of the circuit board 11 on the bus element 3 when the circuit board 11 is pivoted into position. This ensures that the contact elements 4 come into precise contact with the contact fields 110 of the circuit board 11 and slide along the contact fields 110.

[0059] In particular, the attachment of the circuit board 11 to the bus element 3 is in this case independent of any tolerances in the fastening between the circuit board 11 and the housing 10, because due to the direct guidance of the circuit board 11 on the bus element 3, the insertion of the circuit board 11 into the contacting section 30 of the bus element 3 takes place in a defined, guided manner.

[0060] The guide element 31 on the side of the bus element 3 is arranged between the legs 300, 301 of the contacting section 30 and has on its outer side a partially rounded guide surface 310 running obliquely to the vertical direction Z as well as an inwardly pointing contact surface 311 opposite the guide surface 310.

[0061] In contrast, the guide element of the printed circuit board 11 is formed by a recess 112 in the printed circuit board 11, which forms a guide edge 113 and an opposing contact edge 114. The recess 112 can be formed, for example, by milling in the area of ​​a lower edge 115 of the printed circuit board 11 and is incorporated into the printed circuit board 11 during its manufacture.

[0062] When the electronic device 1 is attached to the mounting rail 2 by pivoting the housing 10 about the pivot edge 101, the guide element 31 of the bus element 3 with its guide surface 310 comes into sliding contact with the guide edge 113 on the recess 112 of the circuit board 11. When the housing 10 is pivoted in the pivot direction S, the guide element 31 of the bus element 3 with the guide surface 310 slides on the guide edge 113, whereby contact occurs between the guide element 31 and the circuit board 11, particularly in the area of ​​a lower corner of the guide edge 113. During pivoting, the circuit board 11 is thus guided on the guide element 31 and has a defined position, particularly in the transverse direction Y, relative to the bus element 3, so that it is ensured that the contact elements 4 with the contact legs 430 of the contact forks 43 run onto the contact fields 110 of the circuit board 11 in a defined manner.

[0063] As in the illustrated embodiment, guidance can be provided by a (single) guide edge 113 on one side of the recess 112. However, it is also conceivable and possible for the recess to form a guide track (curved along the pivot direction S) with guide edges on both sides, so that when the housing 10 pivots, a guide element of the bus element 3 is guided on both sides within the recess and slides along the guide edges on both sides.

[0064] In the posed position, shown in Fig. 2B, the contact surface 311 of the guide element 31 of the bus element 3 lies on the contact edge 114 within the recess 112 of the circuit board 11, so that even with the electronic device 1 attached the position of the circuit board 11 relative to the bus element 3 is defined.

[0065] Because the pivoting of the circuit board 11 into the contacting section 30 of the bus element 3 is guided, it is particularly important to prevent the contact legs 430 of the contact elements 4 from potentially coming into contact with the circuit board 11 next to their assigned contact fields 110. Furthermore, it is reliably prevented that the contact legs 430 of a contact fork 43 of a contact element 4 can come into electrical contact with contact fields 110 that are adjacent to the actually assigned contact fields 110.

[0066] The underlying idea of ​​the invention is not limited to the embodiments described above, but can in principle also be realized in a completely different way.

[0067] The bus element can thus have a different shape, e.g., with a different number of contacts.

[0068] Furthermore, the contact elements may have a different shape than described here. The number of contact pins and / or contact forks provided on the contact element may also vary.

[0069] Attaching an electronic device to a mounting rail can be advantageously done by pivoting it. However, this is not the only option. In principle, it is also conceivable and possible, for example, to attach an electronic device to a mounting rail along a straight line. List of reference symbols 1 electronic device 10 housings 100 fastening device 101 Swivel edge 102 Locking edge 11 Circuit board 110 contact fields 111 fastening points 112 recess 113 Guide edge 114 Mounting edge 115 Bottom edge 2 support rails 20 base 21st, 22nd thigh 23, 24 flange 3, 3' bus element 30 Contact section 300, 301 thigh 31 Guide element 310 guide surface 311 Plant area 32 bodies 320 fasteners 321 contact pins 322 contact openings 4 contact element 4A, 4B Fold half 40 contact bodies 41 Contact fork 410 Contact leg (fork parts) 42 Contact pin 43 Contact fork 430 Contact leg (fork parts) D1, D2 thickness L fold line S direction of rotation

Claims

[1] Mounting rail assembly, with - a support rail (2), - a bus element (3) of a mounting rail bus system arranged on the mounting rail (2) and having at least one electrical contact element (4) and - an electronic device (1) which can be attached to the support rail (2) and which has a housing (10) and a printed circuit board (11) arranged therein with at least one contact field (110) for electrical contact with the at least one electrical contact element (4) of the bus element (3), wherein, in a position of the electronic device (1) attached to the support rail (2), the at least one contact field (110) of the printed circuit board (11) is electrically contacted with the at least one contact element (4) of the bus element (3), wherein the bus element (3) has a first guide element (31) and the printed circuit board (11) has a second guide element (113), wherein when the electronic device (1) is placed on the support rail (2), the first guide element (31) of the bus element (3) comes into contact with the second guide element (113) of the printed circuit board (11) and slides along the second guide element (113) in order to guide the printed circuit board (11) relative to the bus element (3), characterized by , that the second guide element is formed by a guide edge (113) of the circuit board (11) and the guide edge (113) is formed on a recess (112) formed in the circuit board (11). [2] Support rail assembly according to claim 1, characterized bythat the housing (10) of the electronic device (1) has a fastening device (100) for fastening the electronic device (1) to the support rail (2), wherein for fastening the electronic device (1) to the support rail (2) the fastening device (100) can be attached to the support rail (2) with a pivoting edge (101) so that the electronic device (1) can be pivoted about the pivoting edge (101) in a pivoting direction (S) to the support rail (2). [3] Support rail assembly according to one of the preceding claims, characterized by that the first guide element (31) of the bus element (3) has a guide surface (310) via which the first guide element (31) comes into sliding contact with the second guide element (113) of the printed circuit board (11) when the electronic device (1) is placed on the support rail (2). [4] Support rail assembly according to one of the preceding claims, characterized by that the at least one contact element (4) of the bus element (3) - a contact body (40) extending flatly along an extension plane (E) and - at least one contact leg (410, 430) projecting from the contact body (40) and extending along the plane of extension (E) for contacting an associated contact field (110) of the printed circuit board (11). [5] Support rail assembly according to claim 4, characterized by that, measured perpendicular to the plane of extension (E), the contact body (40) has a first thickness (D1) and the at least one contact leg (410, 430) has a second thickness (D2) which is smaller than the first thickness (D1). [6] Support rail assembly according to claim 4 or 5, characterized by that the at least one contact leg (410, 430) is formed integrally with the contact body (40). [7] Support rail assembly according to one of claims 4 to 6, characterized by that the contact element (4) is designed as a sheet metal stamped part extending flat along the plane of extension (E). [8] Support rail assembly according to claim 7, characterized by that the at least one contact leg (410, 430) is reduced in its thickness (D2) compared to the contact body (40) by embossing. [9] Support rail assembly according to one of claims 4 to 6, characterized by that the contact element (4) is designed as a folded sheet metal stamped part extending flat along the plane of extension (E), with two folding surfaces (4A, 4B) which are folded towards one another around a folding line (L) in such a way that the folding surfaces (4A, 4B) lie flat against one another at least in sections and together form the contact body (40). [10] Support rail assembly according to one of claims 4 to 9, characterized by that the at least one contact leg (410, 430) is elastically deformable relative to the contact body (40) for making electrical contact with an associated contact field (110) of the printed circuit board (11). [11] Support rail assembly according to one of claims 4 to 10, characterized by that two contact legs (410, 430) together form a contact fork (41, 43), wherein the printed circuit board (11) with a contact field (110) for electrical contacting can be inserted between the contact legs (410, 430). [12] Support rail assembly according to claim 11, characterized by that at least one of the contact legs (410, 430) of the contact fork (41, 43) has a second thickness (D2) which is smaller than the first thickness (D1).

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