SI22960A - Safety electrical switch with fusible cut-out - Google Patents

Abstract

The safety electrical switch with fuse cut-out (4) excels by the fact that the insertion of the fusible cut-out is possible in a quick and easy manner, however only after moving the protective cover (3) into the open position, while inside the switch the electric circuit is disconnected. The access to the inside of the enclosure and in particular of the fusible cut-out as well as other electrically conductive parts is also physically enabled only after the electrical circuit through the switch is interrupted. The switch includes an enclosure (1) inside of which there is a bracket (2) of the fusible cut-out (4) inserted around the rotating point (20), where a protective enclosure (3) is rotationally attached to the rotating point (30). During the shifting of the enclosure (3) into the open position the electrical circuit inside the enclosure (8) is disconnected via the slotted lever (33) in the area of the disconnector (17). It is only after that it is possible to turn the bracket (2) with fusible cut-out (4) around the rotating point (20).

Description

Safety electrical switch with fuse box

The invention relates to the field of electrical engineering, namely to basic electrical components, in particular to the details of protective electrical switches which are adapted for the installation of fusible inserts and comprise means for preventing the formation of an arc.

The invention is based on the problem of how to design a safety electrical switch with a fusible cartridge, which, with the unchanged shape and external dimensions, will be installed in the usual way so far in the generally used load-bearing brackets in electrical distribution boxes and at the same time be adapted to receive a standardized cylindrical fusible cartridge a design whose insertion or removal in the event of a replacement can be carried out in a quick and easy manner, while on the one hand, switching on to the electrical circuit via the fuse box inserted in each switch will only be possible with the housing completely closed and, on the other, access only physically enabled inside the housing, and in particular into the area of the fuse box and other electrically conductive parts, after the electrical circuit has been cut through the switch.

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The electrical switch, as described in SI 20131 A, consists of a housing in which a rotatable fuse holder is mounted around the pivot. The fusible insert mounted on said carrier is thus pivotally pivoted together either inside the housing where it comes into contact with the corresponding electrical contacts, or out of the housing in such a position that the fusible insert can be replaced with another. The housing is constructed in the usual shape and dimensions, which allow the housing to be mounted on standard load-bearing rails in the distribution boxes of electrical wiring. In addition, there are locations provided on the surface of the housing where the supply and discharge electrical wire are attached to the switch, thereby connecting the available electrical contacts to the available electrical circuit inside the housing, which is then passed through the melter. Each of the electrical contacts that cooperate with the fusible insert, when inserted into the housing, is designed as an electrically conductive sheet, curved into at least about a semicircular loop, namely roughly in the form of a Greek Ω (omega), so that the fusible insert with its cylindrical an electrical conductive surface at each end enters between the two arms of the respective contact. When the switch is actuated during the rotation of the carrier with the fusible insert mounted against the contacts inside the housing, the insert with its surfaces enters relatively slowly and gradually between the contact arms, which can lead to the formation of an electric arc and at the same time relatively wear on the contact surface. Similarly during switch deactivation due to e.g. the replacement of the fusible cartridge gradually exits the contact area, which is energized. Thus, with such a switch, e.g. with the help of a suitable object, in particular a screwdriver or similar tool, access to the inside of the housing is possible even with the partially removed fusible carrier, whereby the circuit through the switch can still be closed or closed. when the electrically conductive parts are still energized.

Further, DE 28 18 360 C3 and also EP 1 224 677 BI describe a switch consisting of a housing housing a fusible cartridge housing with integrated electrical contacts that cooperate with electrically conductive areas on the fusible cartridge. The housing further provides an electrically non-conductive cover, which is rotatable from a closed position in which it extends over and prevents access to the fusible insert into an open position at an angle of about 90 ° from the aforementioned position, or vice versa. Inside the housing, an electrical circuit breaker is further provided for interrupting the circuit during the rotation of said cover from the closed to the open position, which automatically closes again during the movement of the cover in the opposite direction. The breaker consists of an electrically conductive panel supported on one side by a spring and, on the other hand, by electrically conductive parts spaced apart, which are electrically connected via said panel. Said cover is provided in the vicinity of its pivot with a pole which is guided in a suitable guide and supported on said plate. While opening the cap, it pushes the spring force plate away from said electrically conductive parts, thereby interrupting the electrical circuit. During closing of the lid, the pole moves in the opposite direction, with the spring pushing the plate to the starting position of contact on said electrically conductive parts, thereby closing the circuit again. Therefore, when the lid is open, the electrical circuit is interrupted and the fusible insert is inserted deep inside the housing and is relatively difficult to remove from the housing. In particular, since encroachment on the inside of the housing for the user is always associated with the risk that any of the electrically conductive components may, in principle, be guaranteed to break the electrical circuit, e.g. malfunction or movement of any of the parts may still be electrically powered. On the other hand, in the case of a partially open lid, a thin object can be inserted inside the housing, although the circuit through the switch may still be / already closed, which of course can be extremely dangerous for the user.

The present invention relates to a safety electrical switch with a fusible insert, consisting of a housing of electrically non-conductive material, comprising suitable electrical connections for connecting the switch to the electrical circuit available at all times, as well as an electrically conductive supporting carrier mounted inside the said housing . As a melting insert, a cylindrical type melting insert is provided, which is equipped with electrically conductive fittings at the ends. The electrically conductive contact elements, each of which is intended to receive one of the said fuse inserts and are electrically connected to the respective connection, at least one of them via a corresponding circuit breaker, are provided further in the housing for receiving the fusible insert. , which can optionally be interrupted by an electrical circuit formed through the fusible insert with the above terminals and contact elements.

According to the invention, the fusible carrier together with the latter is rotatable around in the housing of the available pivot and comprises an electrically non-conductive material comprising a protective cover which is rotatable about its on said carrier of the rotatable rotation from closed to open position or vice versa and via electrically non-conductive material and suitably rigid scenery connected to said circuit breaker, whereby a circuit is formed when the lid is removed from the closed to the open position in the region of the circuit breaker via said terminals, and electrical contact elements and a fuse box are formed. Said carrier is generally rotatable about its pivot between the two end positions, namely during the first end position, in which said carrier with the melter insert is located in the area of the contact elements so that the fuse links of the melter are in contact with the contact

elements, and other end positions in which said carrier is detached at least partially out of the housing, at least to the extent that it is possible to remove or insert a melting insert from the carrier region, but provided that, when the protective cover is closed, until it is unscrewed to the open position and thus, until the electrical circuit in the circuit breaker is interrupted, any rotation of the carrier around the pivot from its starting position is physically prevented, in which the fittings of the fuse insert are in contact with the corresponding contact elements, in a partially out of position housing , in which it is possible to remove or insert a fusible insert from the carrier, and only after the protective cover is removed to the open position, the rotation of the fusible carrier around its pivot is also possible.

In a preferred embodiment of the invention, said carrier preferably comprises a guide sleeve into which a fusible insert is inserted in its axial direction, and the breaker consists of a rigid spring-supported electrically conductive plate by which said plate is pressed in the direction of one of the connectors and at the same time against the respective contact element, which is adapted to make electrical contact with the respective fitting of the fusible insert. In addition, one contact surface is provided each time for the purpose of fitting the contact plate of the circuit breaker on the contact element and on the connector. Said spring is preferably available as a pressure coil spring.

Further, each of the fusible inserts provided for each and every one of the housing-connected connectors, provided for each of the fuse inserts, preferably consists of a U-shaped electrically conductive sheet, with the contact element arranged closer to the breaker in the direction of the fasteners provided. and the remaining contact element in the reverse direction.

Furthermore, with one end on the spring-supported contact plate of the breaker, the rigid backdrop at its remaining end comprises coaxial and projecting guiding nozzles, which are adapted to cooperate with one another, such as V-shaped grooves and according to the pivot of the cover by eccentrically arranged beds on the protective cover, and on the other hand, inserted individually into the respective guide groove on the inner surfaces of the sides of the housing, so that when the protective cover is closed, said nozzles are in their first stable position in the area of said beds, contacting the breaker contact plate on the associated contact element and connector due to spring pressure, and with the protective cover open, said nozzles are in their remaining stable position in the end region of the guide groove, due to the displacement of the scaffold in the direction of contact said breaker plate, said plate kept at a distance from the associated connector and contact element against the pressure of said spring, until the said plugs are moved back to the starting position by said bearings through said grooves by means of said bearings through the guide groove, namely in their first stable position.

In addition, the lid in the area of the pivot on the bracket is provided with protruding and co-axial plugs, each of which is provided with oppositely spaced and at least approximately fitted snaps, said plugs being inserted in the corresponding guide grooves, which available on the inner surfaces of the sides of the chassis, with the width and stroke being mentioned

of the guide grooves such that the width of each groove in the area of the pivot of the cover on the carrier is greater than the diameter of the stud, and outside the area of said pivot less than the diameter of the stud and greater than the distance between the shots, and the groove corresponds to a circular arc with a radius in the pivot of the carrier in the housing , so that each plug with its recordings is rotatable in its pivot on the carrier, and the carrier is rotatable around its pivot only when the lid is detached to an open position and the studs with the recordings are only in such a position that they are able to enter said guide The gutter also enables the carrier to be rotated with the fusible insert in a position where the support extends beyond the housing at least in part and can be inserted into and removed by the fusible insert.

The aforementioned cover comprises a projecting guide stud, and the housing provides on each side one guide, which cooperates with the respective leading plug of the cover, each guide together with each corresponding leading plug defining the possibility of movement on the carrier of the installed cover in the housing and consequently the possibility of moving the lid relative to the carrier as well as the lid together with the carrier relative to the housing. Said guide preferably comprises each side-locked surface such that during rotation of the cover, each guide pin interacts with one lateral surface and during the rotation of the carrier with the remaining lateral surface.

According to the invention, it may also be provided that at least one hole is provided on the protective cover and / or carrier for connecting the carrier and / or cover to the carrier and / or cover of each adjacent switch in the multipole switching device. According to the invention, at least one filling hole may be provided on the support.

The invention will now be explained in more detail on the basis of the embodiment shown in the accompanying drawing showing

FIG. 1 safety switch in closed state and in outline;

FIG. 2 is a cross-sectional view in the plane II - II of FIG. 1;

FIG. 3 is a switch according to FIG. 1, again in the closed state of the housing and in the plan;

FIG. 4 shows a longitudinal cross-section switch in plane IV - IV according to FIG. 3;

FIG. 5 is a switch as in FIG. 3 in the closed state of the housing and in the floor plan;

FIG. 6 shows a longitudinal cross-section switch in plane VI-VI according to FIG. 5 and in closed condition; FIG. 7 is a cross-sectional view in the plane VI - VI according to FIG. 5 and in partially open condition;

FIG. 8 is a cross-sectional view in the plane VI - VI according to FIG. 5 and in completely open condition.

The safety electrical switch according to the invention consists of a housing 1 in which a type melting insert 4 is inserted on a suitable carrier 2 equipped with a protective cover 3.

Said melt insert 4 is cylindrical in shape and at the ends comprises electrically conductive fittings 41, 42, which are electrically connected to each other by an electrically conductive melting element not shown at each time, a predetermined electrical resistance and a rated current at which the electrical connection between said fittings 41, 42 due to the melting of said element in / on the melt insert 4 interrupts.

The housing 1 as such is, in principle, constructed within typified dimensions and consists of an electrically non-conductive material, and at its back surface 10 'comprises means 11, 12 for securely temporarily or permanently attaching a carrier or similar carrier available in each respective distribution box, which is undoubtedly understood by one skilled in the art and therefore not shown in the sketch.

Further, the housing 1 is provided with suitable electrical connections 13, 14, namely a supply terminal 13 and a discharge terminal 14, which are adapted to receive the corresponding electrical conductors, which are not otherwise shown, and which belong to the respective electrical circuit into which optionally included switch according to the invention, thus forming a circuit then thanks to such a switch is protected against electrical overloads.

Said terminals 13, 14 are electrically connected to electrically conductive contact elements 15, 16 arranged inside the housing 1 and adapted to cooperate with said electrically conductive fittings 41, 42 of the insert 4 when the latter is properly inserted inside the housing 1 of the switch according to the invention and the switch is ready to be connected to an electrical circuit running through it. Thus, the inlet port 13 is electrically connected to the associated contact element 15, which in the present example is available as a U-shaped, electrically conductive sheet, curved and in the direction away from said back surface 10 'of the housing 1, a part, between which it branches with one of its fuse 41 enters the fusible insert 4, which then provides an electrical connection between the fusible insert 4 and the supply port 13 on the switch housing 1. On the other hand, the discharge port 14 on the housing 1 of the switch according to the invention is electrically connected to the rest of the contact element 16 via the circuit breaker 17, which in the example shown is similar to the previously considered terminal 13 and is also formed from an electrically conductive U-shaped plate and is arranged in the opposite direction, and as such is adapted to receive the remaining shackle 42 of the melt insert 4, so that the melt insert 4 is properly positioned in the housing 1 and then electrically connected to said drain connection 14 on the housing 1 via said breaker 17.

The breaker 17 consists of a relatively rigid electrically conductive plate 171 supported by a spring 172, which in this case is made as a pressure screw spring, by means of which said plate 171 is pressed against the drainage connection 14 and the associated contact element 16, so that between them an electrical connection is provided via said plate 171, which can optionally be cut off by pressing the plate 171 in the direction of the force of said spring 172. In the example shown, for the sake of uniform and reliable contact with the spring 172 of the supported panel 171 of the breaker 17 at the connector 14 and the contact element 16, said connector 14 is provided with a contact surface 141 and said contact element 16 with a contact surface 161 so that the plate 171 is in position establishing an electrical connection between the housing 14 of the housing 1 and cooperating with the melting insert 4 of the intended contact element 16 on the latter and the terminal 14 at one and the same time in the area of said contact surfaces 141, 161.

As mentioned, in the housing 1 of the switch there is a carrier 2 of the melter insert 4. In the shown example, the melter insert 4, by its axial direction, is inserted into the guide sleeve 21, which represents an integral part of the carrier 2. The carrier 2, which is provided with a protective cover 3 is rotatably pivoted in the housing 1 and is pivotable in principle about the pivot 20, which is only possible, provided that it is previously from its closed position according to FIG. 1 to 6 in the open position according to FIG. 7 and 8 unscrewed protective cover 3.

Said protective cover 3 on the sides comprises on each side a bearing 31, each of which in the shown case is designed as a V-shaped lug and arranged eccentrically with respect to said pivot 30, around which a lid 3 is rotated on said carrier 2. each of said bearings 31 is each in each case provided with one of the two coaxially coaxial and projecting projections 32 respectively, with a rigid housing 33, which, thanks to the said attachments, is also guided in the corresponding guide grooves 104 on the inner surfaces of the sides 101, 102 of the housing 1, at wherein said scaffold 33, on the other hand, is supported by a spring-supported plate 171 of circuit breaker 17.

With the selected length of the scaffold 33, when the protective cover 3 (Fig. 1 6) is closed, the scaffold 33 is otherwise supported on the plate 171, which is pressed against the contact surfaces 141, 161 of the discharge connection 14 and the contact element 16 by means of a spring 172, thereby interfering with connection 14 and contact element 16 are provided with an electrical connection. During the opening of the protective cover 3, namely, while rotating the cover 3 around the pivot 30 on the carrier 2 from the position of FIG. 1 - 6 to the position of FIG. 7 and 8, the carrier 2, together with the melt insert 4, remains in its interior position, and owing to the eccentricity of the bearing 31 of the scaffold 33 relative to the pivot 30 of the cover 3, the scaffold 33 removes the contact plate 171 of the breaker 17 and compresses the spring 172, interrupting the electrical circuit between the connection 14 and the melting insert 4 of the cooperating contact element 16. During the rotation of the cover 3, the mounting 32 of the scaffold 33 from its initial stable position according to FIG. 1 to 6, they are moved to another stable position in the end region 104 'of the guide groove 104 (Figs. 7 and 8), where, due to the pressure, the springs 172 are curved until they are then restored to the first starting position by the slots 31 at the rotation of the protective cover 3 into the closed position. Meanwhile, due to the pressure of the scenery 33 on the contact plate 171, the latter is permanently offset from the corresponding contact surfaces 141, 161.

Always and only when the protective cover 3 is moved to the open position according to FIG. 6 and 7, it is also possible to rotate the support 2 with the inserted melter 4 around the pivot 20 in the housing 1, from the position of FIG. 1 - 7 to the position of FIG. 8, whereby the cover 3 remains in the open position during the rotation of the carrier 2, and its attachments 32 in the end zone 104 'of the guide grooves 104 on the housing 1 of the trapped shaft 33 are permanently supported on the plate 171, which is supported by a properly compressed spring. 172, said contact plate 171 of the circuit breaker 17 being spaced at all times from the contact surfaces 141, 161 of the connector 14, and with the melting insert 14 of the participating contact element 16.

The fact that the carrier 2 can be rotated about the pivot 20 in the housing 1 only in the case when the cover 3 is open can be realized in several ways, in FIG. 6 illustrates only one possible solution. In this case, the cover 3 in the area of its pivot 30 on the carrier 2 comprises projecting studs 34 each, each comprising diametrically opposite and at least approximately parallel shots 341, 342, each of said plugs 34 being inserted in a corresponding guide groove 103 on the inner surface of the respective side 101, 102 of the housing 1. By selecting the width and shape respectively. of said guide grooves 103 along a constant radius with respect to the pivot 20 of the carrier 2 in the housing 1 it is possible to achieve that the guide studs 34 of the lid 30 pivot 3 along the associated guide grooves 103 are movable only in the corresponding position of said clips 341, in which they can enter the guide groove 103. Since the cover 3 is mounted on the carrier 2, it is therefore in an improper position of the clips 341 of the stud 34 in the closed position of the cover 3 according to FIG. 1 to 6 may otherwise rotate the cover 3 in the pivot 30, while at least in the case of regular use, any other movement of the studs 34 along the guide grooves 103 on the housing 1 is physically completely prevented, thus preventing the carrier 2 from rotating around the pivot 20 in the housing 2.

Further, cover 3 comprises further projecting guide pins 35 adapted to cooperate with the available guide 18, which is available on each of the sides 101, 102 of the housing 1. Said guide 18 is designed as shown in FIG. 6, 7 and 8, so that it provides guidance for the studs 35, thereby determining the possibility of moving the carrier 2 with respect to the housing 1 and at the same time the possibility of moving the cover 3 with respect to the carrier 2 or. together with the carrier 2 with respect to the housing 1 from the position of FIG. 6 through the position of FIG. 7 into the position of FIG. 8 and vice versa. In the position of FIG. 4, when the cover 3 is opened, said plugs 35 are located on one side 18 'of the guides 18, while during the rotation of the carrier 2, guides 18 travel from the position of FIG. 7 into the final position according to FIG. 8.

In the present embodiment of FIG. 1 to 8, it is provided that after the protective cover 3 is positioned in the open position (Figs. 7 and 8), said carrier 2 can be rotated to its position around its pivot 20 in the housing 1 according to FIG. 8, wherein the electrically conductive fittings 41, 42 of the melt insert 4 protrude from the associated contact elements 15, 16 and the support 2 swivels out of the housing 1 to such an extent that the melt insert 4 can be removed quickly and easily from the guide sleeve 21 on the support 2 or insert it into said guide sleeve 21. As mentioned, the circuit through the switch is automatically interrupted all the time from the rotation of the protective cover 3 to its open position further when the scenery 33 moves from its first stable position according to FIG. 1 - 6 to another stable position in the end region 104 'of the guide groove 104, until the lid 3 returns to its starting position when rotated to its closed positions 31 with its bearings 31, thereby causing the contact plate 171 of the breaker 17 to it forces the springs 172 back into contact on the contact surfaces 141, 161 and establishes a circuit through the electrically conductive elements 13, 14, 15, 16, 171 and the melt insert 4, 41, 42.

According to the invention, it is further provided that at least one filler hole 290, 390 is provided on the carrier 2 and / or cover 3, thereby allowing the switch to be sealed either in the on or off state, in addition to sealing the melting cartridge 4 itself in the closed state switch state.

In addition, according to the invention, at least one hole 29, 39 is provided for both the carrier 2 and the cover 3 each time to receive non-shown poles for interconnecting the supports 2 and the covers 3 more in a series of switches mounted on multi-pole switchgear.

Claims (12)

PATENT APPLICATIONS 1. A safety electrical switch with a melter (4) consisting of a housing (1) made of electrically non-conductive material comprising electrical connections (13, 14) for connecting the switch to the electrical circuit available at any time, as well as inside said housing (1) an electrically conductive material consisting of a support (2) of the melter insert (4), the type melting insert (4) preferably having a cylindrical type melting insert equipped at the ends with electrically conductive fittings (41, 42), and at the electrically conductive contact elements (15, 16) being provided and arranged accordingly for receiving said melting insert (4), each of which is intended to receive one of said melting fittings (41, 42) further provided in the housing (1). inserts (4) and electrically connected to the respective electrical connector (13, 14) on the housing (1), at least one of them through a corresponding circuit breaker (17), by which optionally, an electrical circuit can be interrupted inside the housing (1) by means of said terminals (13, 14) and contact elements (15, 16), characterized in that the melter insert carrier (2) is formed (4). 4) together with the latter, rotate around the housing (1) of the available pivot (20) and comprise an electrically non-conductive material comprising a protective cover (3) rotatable around it on said mount (2) of the pivot (30) from closed to open position, or vice versa, and an electrically non-conductive backdrop consisting of a properly rigid backdrop (33) connected to said circuit breaker (17), thereby terminating in the housing (17) when the lid (3) is removed from the closed to open position in the region of the circuit breaker (17). 1) an electrical circuit is formed through the terminals (13, 14), the electrical contact elements (15, 16) and the melt insert (4), said support (2) being generally rotatable around its pivot (20) between the two end positions, namely during the first end position, when the support (2) with the melter insert (4) is located in the area of the contact elements (15, 16) such that the fittings (41, 42) of the melter insert (4) ) in contact with the contact elements (15, 16), and the second end position, when the carrier (2) is at least partially dislodged from the housing (1) to such an extent that it is possible to remove or insert the melter from the area of the carrier (2) the insert (4), but provided that in the closed position of the protective cover (3), until the fly is released into the open position, and thus the electrical circuit in the area of the circuit breaker (17) is physically prevented from rotating any carrier (2) around the pivot ( 20) from a starting position in which the fittings (41, 42) of the melter insert (4) are in contact with the associated contact elements (15, 16), in a partially out-of-the-case (1) position, which is possible from the carrier ( 2) Remove or insert the fusible cartridge (4), and only after opening the lid (3) to the open position is it possible to rotate the support (2) of the melter insert (4) around its pivot (20). Switch according to claim 1, characterized in that the carrier (2) comprises a guide sleeve (21) into which a melting insert (4) is inserted in its axial direction. Switch according to claim 1 or 2, characterized in that the circuit breaker (17) consists of a rigid electrically conductive plate (171) supported by a spring (172) by means of which said plate (171) is pressed in one direction from the terminals (13, 14) and at the same time against the respective contact element (15, 16), which is adapted to make electrical contact with the corresponding fitting insert (41, 42) (4). A switch according to claim 4, characterized in that a contact surface (161) is provided on the contact element (15, 16) and a contact surface (14, 14) on the contact element (15, 16). (141). Switch according to claim 3, characterized in that the spring (172) is available as a pressure coil spring. Switch according to one of Claims 1-5, characterized in that each of the contact elements (13, 14) of the contact element (13, 14) provided for each and every one of the receiving fittings (41, 42) of the melter insert are provided and each of them is provided with a connection (13, 14). 15, 16) consists of a U-shaped electrically conductive sheet, with the contact element (16) arranged closer to the breaker (17) arranged in the direction of the base (10 ') provided with the fasteners (11, 12), and the remaining contact element (15) in the opposite direction. Switch according to one of Claims 1 - 6, characterized in that, with one end on the spring-supported contact plate (171) of the breaker (17), the rigid scaffold (33) at its remaining end comprises a coaxial and projecting guide nozzle at each other. (32) adapted to cooperate with the corresponding V-shaped beams on the one hand and with respect to the pivot (30) of the lid (3) by eccentrically spaced beds (31) on the protective cover (3) and, on the other, each individually inserted into the respective guide groove (104) on the inner surfaces of the sides (101, 102) of the housing (1) such that, with the protective cover closed (3), said nozzles (32) are in their first stable position in the range mentioned of the bearings (31) and the backdrop (33) permits the contact plate (171) of the breaker (17) to rest on the associated contact element (15, 16) and the connection (13, 14) due to the spring pressure (172), with the protective cover (3) open ) is limited its nozzles (32) are in their remaining stable position in the end region (104 ') of the guide groove (104), said plate (171) being displaced by the displacement of the stage (33) towards the contact plate (171) of the breaker (17). kept at a distance from the associated connection (13, 14) and the contact element (15, 16) against the pressure of said spring (172) until the said plugs (32) are back in the closed position during rotation of the cover (3) by means of the said bearings (31), they do not move back to the starting position after the guide groove (104), namely to their first stable position. Switch according to one of Claims 1 - 7, characterized in that the protective cover (3) in the area of the pivot (30) on the carrier (2) is provided with projections and coaxial plugs (34), each of which is individually provided with oppositely spaced and at least approximately fitted snaps (341, 342), said plugs (34) being inserted into the corresponding guide grooves (103) available on the inner surfaces of the sides (101, 102) of the housing (101, 102). 1), wherein the width and the course of said guide grooves (103) are so selected that the width of the respective groove (103) in the area of pivot (30) of the lid (3) on the carrier (2) is larger than the diameter of the stud (34), outside the areas of said pivot (30) being smaller than the diameter of the stud (34) and greater than the distance between the clips (341, 342), and the grooves (103) correspondingly correspond to a circular arc with a radius in the pivot (20) of the carrier (2) in the housing ( 1), so that each plug (34) with its clips (341, 342) rotates in its on the carrier (2), and the carrier (2) is rotatable around its pivot (20) only if the lid (3) is open to the open position and is sealed (34) with clips (341, 342) only in such a position are they allowed to enter said guide groove (103), thus also allowing the carrier (2) of the melter insert (4) to be rotated to a position where the carrier (2) extends beyond the housing (1) at least partially the melter insert (4) can be inserted or removed. Switch according to one of Claims 1 - 8, characterized in that the cover (3) comprises projecting guide bushes (35) and one guide (1, 10) is provided on each side (101, 102). 18) with which the respective guide pin (35) cooperates, wherein each guide (18) together with the respective guide pin (35) determines the possibility of movement on the carrier (2) of the installed cover (3) in the housing (1) and with consequently, the possibility of moving the lid (3) with respect to the carrier (2) as well as the lid (3) together with the carrier (2) with respect to the housing (1). A switch according to claim 9, characterized in that said guide (18) comprises each side-locked side surface (18 ', 18) and that, during rotation of the cover (3), each guide pin (35) interacts with one side surface (18') ) and with the remaining lateral surface (18) while the carrier (2) is rotated. Switch according to one of the preceding claims, characterized in that at least one hole (29, 39) is provided on the carrier (2) and on the protective cover (3) for connecting the carrier (2) and the cover (3) to at least one the carrier (2) and at least one cover (3) of each adjacent switch in the multipole switching device each. Switch according to one of the preceding claims, characterized in that at least one filler hole (290, 390) is provided on the support (2) and / or cover (3).