CN108701562B

CN108701562B - Load break switch

Info

Publication number: CN108701562B
Application number: CN201780014153.3A
Authority: CN
Inventors: 约拉姆·马塞尔; 菲利普·施泰因贝格尔
Original assignee: Woehner GmbH and Co KG Elektrotechnische Systeme
Current assignee: Woehner GmbH and Co KG Elektrotechnische Systeme
Priority date: 2016-02-29
Filing date: 2017-02-23
Publication date: 2020-11-06
Anticipated expiration: 2037-02-23
Also published as: CN108701562A; WO2017148804A1

Abstract

The invention discloses a switch disconnector (1) comprising a switch contact arrangement (2) for each current phase (L), said switch contact arrangement (2) being connected to an associated access strip (16), which access strip (16) is arranged on the rear side of a housing (5) of the switch disconnector (1) for establishing an electrical contact with a conductive strip (SS); the switching contact arrangement (2) can be switched by means of a tool-friendly operating unit (19) of the switching disconnector (1).

Description

Load break switch

Technical Field

The invention relates to a load-break switch, in particular a load-break switch comprising a strip-shaped housing, in which current fuses for different current phases are arranged.

Background

Loadbreak switches are used to disconnect a load or user from a current or voltage distribution system. The current distribution system may comprise one or more current supply bars, in particular current bus bars. The user or load is connected to the current distribution system through a loadbreak switch. The loadbreak switch may include a pluggable current fuse. To disconnect the current phase from the load or user, the user or operator may manually actuate an actuation handle to open switch contacts within the loadbreak switch. The actuating handle has a guide bracket that extends into the interior space of the loadbreak switch and is mechanically coupled to the switch contacts. In the case of conventional loadbreak switches, the operating unit for actuating the loadbreak switch is not completely tool-safe. For example, a tool (e.g., a screwdriver) can be introduced through a slot-like opening provided in the housing of the loadbreak switch for actuating the handle, thereby reducing the level of safety for the user and the operating device.

Disclosure of Invention

It is therefore an object of the present invention to provide a load break switch which can be operated in a particularly safe manner.

According to the invention, this object is achieved by a load break switch having the following features.

The invention therefore provides a load break switch in which a switch contact arrangement is provided for each current phase, which switch contact arrangement is connected to an associated input bar which is arranged on the rear side of a housing of the load break switch for establishing an electrical contact with a current carrying bar, wherein the switch contact arrangement can be switched by a tool-safe operating unit of the load break switch which is attached to the front side of the housing.

In one possible embodiment of the load break switch according to the invention, for each current phase, an associated current fuse can be inserted into the housing of the load break switch.

In a further possible embodiment of the loadbreak switch according to the invention, the housing of the loadbreak switch is designed in the shape of a bar.

In a further possible embodiment of the load break switch according to the invention, a plurality of fuses for different current phases, in particular three current phases, are arranged side by side in a housing of the load break switch, which housing is designed as a bar.

In a further possible embodiment of the load break switch according to the invention, the tool-safe operating unit has an actuating handle with two guide brackets which are connected to the snap-action switching device for switching at least one switching contact device of the load break switch independently of an operator.

In a further possible embodiment of the load break switch according to the invention, the guide bracket of the actuating handle of the tool-safe operating unit is guided along a plurality of protective ribs in an associated lateral section of the bar-shaped housing of the load break switch.

In one possible embodiment of the loadbreak switch according to the invention, the protective ribs of the lateral sections are arranged in a staggered manner with respect to one another, so that a tool, in particular a screwdriver, cannot be introduced into the interior of the housing of the loadbreak switch.

In a further possible embodiment of the load break switch according to the invention, the guide brackets of the actuating handle of the tool-safe operating unit each have at least one S-shaped projection which surrounds the associated protective rib of the respective lateral section without touching it.

In a further possible embodiment of the load break switch according to the invention, the switch contact arrangements each have at least one switch contact which is fixedly arranged in the housing of the load break switch and at least one loose contact which is attached to a loose contact carrier.

In a further possible embodiment of the load break switch according to the invention, the loose contact carrier has a switch carriage which can be moved in a translatory manner in the longitudinal direction of the bar-shaped housing of the load break switch by means of a snap-action switching device of the load break switch during actuation of the actuating handle of the tool-safe operating unit.

In a further possible embodiment of the loadbreak switch according to the invention, the strip-shaped housing of the loadbreak switch can be mounted in the vertical direction on a substantially horizontally extending current carrying bar, in particular a current bus bar.

In a further possible embodiment of the load break switch according to the invention, the actuating handle of the tool-safe operating unit of the load break switch can be moved downwards in the longitudinal direction of a bar-shaped housing of the load break switch, which is mounted vertically on the current carrying bar, to open the switch contact arrangement, and the actuating handle can be moved upwards in the longitudinal direction of the bar-shaped housing of the load break switch, which is mounted vertically on the current carrying bar, to close the switch contact arrangement.

In a further possible embodiment of the load break switch according to the invention, in the open switch state of the load break switch with the actuating handle of the tool-safe operating unit in the lower switching position, the latch attached to the upper end side of the housing of the load break switch can be pulled out of the housing of the load break switch, wherein in the pulled-out position the snap-action switching device of the load break switch is mechanically blocked.

In a further possible embodiment of the loadbreak switch according to the invention, the latch in the pulled-out position can be visually locked by at least one rack lock.

In a further possible embodiment of the load break switch according to the invention, at least one index indicator is provided, which indicates the actual switching state of the load break switch, in particular of the switching contact arrangement contained therein, irrespective of the position of the actuating handle of the tool-safe operating unit.

In a further possible embodiment of the load break switch according to the invention, a fuse cover with an observation window is provided on the front side of the load break switch and covers the current fuse of the load break switch accommodated in the housing.

In a further possible embodiment of the load break switch according to the invention, the actuating handle of the tool-safe operating unit is connected to the fuse cover in the open switch state of the load break switch and can be pulled out of the snap-action switching device of the load break switch in order to open the fuse cover.

In a further possible embodiment of the load break switch according to the invention, the fuse cover can be locked both in the on-switch state of the load break switch and in the off-switch state of the load break switch.

In a further possible embodiment of the load break switch according to the invention, the observation window of the fuse cover has an inspection opening for voltage testing.

In a further possible embodiment of the load break switch according to the invention, mounting channels are each provided in the housing of the load break switch below a current fuse which can be inserted in the housing, said mounting channels each having a removable protective cover.

In a further possible embodiment of the loadbreak switch according to the invention, the mounting channel of the housing of the loadbreak switch extends through an elongated opening in a switch carriage which is movable in a translatory manner within the housing.

In a further possible embodiment of the load break switch according to the invention, the current fuses are arranged in a row in a strip-shaped housing of the load break switch.

In a further possible embodiment of the loadbreak switch according to the invention, the current fuses arranged in a row are located one above the other after the loadbreak switch has been mounted vertically on a substantially horizontally extending current carrying bar.

In a further possible embodiment of the loadbreak switch according to the invention, the ventilation channel extending vertically in the housing of the loadbreak switch conveys waste heat and/or switching gas upwards after the loadbreak switch has been mounted vertically on a substantially horizontally extending current carrier bar and conveys the waste heat and/or switching gas outwards on the upper end side of the housing of the loadbreak switch.

According to a further aspect, the invention also provides a current distribution system comprising the features of claim 23.

The invention thus provides a current distribution system in which a fuse load-break switch and a load-break switch according to the first aspect of the invention may be mounted in a vertical direction on a substantially horizontally extending current carrying bar, in particular a current bus bar.

This allows a particularly flexible arrangement of the loadbreak switch and the fuse loadbreak switch on a common horizontally arranged current carrying bar, in particular a current bus bar. As a result, considerable space can be saved, for example, during installation in a switchgear cabinet. Furthermore, since all switching devices can be vertically mounted on the parallel-extending current-carrying bars, the branches extending vertically from the current-carrying bars become superfluous.

Drawings

In the following, possible embodiments of the load break switch according to the invention and of the current distribution system according to the invention will be explained in more detail with reference to the drawings.

In the figure:

fig. 1 shows a perspective view of one possible embodiment of a loadbreak switch according to the present invention;

fig. 2 shows a front view of the loadbreak switch shown in fig. 1 with the housing open;

fig. 3 illustrates a perspective detailed view of an exemplary embodiment of the loadbreak switch shown in fig. 1;

fig. 4 shows a perspective view of a switch carriage for the load break switch shown in fig. 1 as a loose contact carrier for a switch contact arrangement contained in the load break switch;

fig. 5 shows an exemplary embodiment of a loose contact group that can be used for a switching contact arrangement comprised in a load break switch according to the invention;

fig. 6 shows an exemplary embodiment of a switching contact arrangement using the loose contact group shown in fig. 5;

fig. 7 shows a perspective detailed view of a tool-safe operating unit for use in a load-break switch according to the invention;

fig. 8 illustrates a front side view of the loadbreak switch of fig. 1 in accordance with the present invention;

fig. 9 illustrates a view of the loadbreak switch of fig. 1 without the front cover illustrated in fig. 8 in accordance with the present invention;

fig. 10 shows a sectional view of a housing of a loadbreak switch according to the invention to illustrate an exemplary embodiment of a tool-safe operating unit usable by the loadbreak switch according to the invention;

fig. 11 shows a perspective view for illustrating the technical advantages achieved by the load break switch according to the present invention;

fig. 12 shows a sectional view for explaining the operational safety provided by the tool-safe operating unit of the load break switch according to the invention;

FIG. 13 illustrates a perspective view of a load break switch having a fuse cover opened in accordance with the present invention;

fig. 14 shows a partial cross-sectional view of a housing of a loadbreak switch in accordance with the present invention to illustrate the option of mounting on a current carrying bar;

fig. 15 shows a diagram illustrating an exemplary embodiment of a current distribution system according to the present invention, according to a further aspect of the present invention.

Detailed Description

Fig. 1 shows a perspective partial section view for explaining an exemplary embodiment of a load break switch 1 according to the invention, according to a first aspect of the invention. For different current phases L, the loadbreak switch 1 has a switching contact arrangement 2, which switching contact arrangement 2 is connected to an associated input bar 16 of the loadbreak switch. An input strip 16 is arranged on the rear side of the housing 5 of the loadbreak switch 1 for establishing electrical contact with a corresponding current carrying strip SS. The housing 5 consists, for example, of a refractory synthetic material. The switching contact arrangement 2 of the loadbreak switch 1 arranged in the housing 5 can be switched by a tool-safe operating unit 19 of the loadbreak switch 1, which tool-safe operating unit 19 is attached to the front side of the housing 5. Fig. 6 shows an exemplary embodiment of a switching contact arrangement 2 which is included in a load break switch 1. In the exemplary embodiment shown, the switching contact arrangement 2 has loose contact units 3 or loose contact groups 3. An exemplary embodiment of such a loose contact group 3 is shown in fig. 5. In the exemplary embodiment shown, the loose contact unit 3 is attached to a loose contact carrier 4 or a switch carriage 4, as shown in fig. 6. The loose contact carrier 4 shown in fig. 6 can be a switch carriage of the load break switch 1 according to the invention shown in perspective view in fig. 4. As shown in fig. 1, the switch carriage 4 of the load break switch 1 is arranged to be movable in a translatory manner within the housing 5 of the load break switch 1.

The front side of the loadbreak switch 1 (i.e., the side of the housing 5 at the top in fig. 1) represents the operating plane of the switchgear or loadbreak switch 1. In the case of the load break switch 1 according to the invention, the operating unit 19 is designed to be tool-safe (IP 30). The tool-safe operating unit 19 has an actuating handle 15, the actuating handle 15 having two

guide brackets

15A, 15B, the

guide brackets

15A, 15B being connected to a snap-action switching device 17 for switching at least one switching contact device 2 present in the housing 5 independently of an operator. The

guide brackets

15A, 15B of the actuating handle 15 are guided on the one hand in the tool-safe operating unit 19 and on the other hand preferably mechanically along a plurality of protective ribs in associated side portions of the bar-shaped housing 5 of the loadbreak switch 1.

Fig. 10 shows a detailed view of a section of the side part present on the housing 5 and having the protective rib 23. As shown in fig. 10, the operating unit 19 is located in the outer housing 5 of the load break switch 1. The operating unit 19 and the side portion of the outer case 5 shown in fig. 10 each have a protective rib 23, 24. The protective ribs 23, 24 are preferably staggered relative to one another, so that a tool W cannot be introduced into the interior of the housing 5 of the loadbreak switch 1. Fig. 10 shows a cross-sectional view of the guide bracket 15B of the actuating handle 15, which guide bracket 15B extends within the housing 5. The

guide brackets

15A, 15B of the actuating handle 15 are each adapted to the geometry of the staggered protective ribs. In a preferred embodiment, as shown in fig. 10, the guide bracket (e.g., guide bracket 15B shown in fig. 10) has at least one S-shaped projection 22B that surrounds, but does not contact, the associated protective rib 23 of the side portion of the housing 5. Alternatively, the guide bracket 15B or the guide bracket 15A of the actuating handle 15 may also surround the protective rib of the operating portion 19 in an S-shaped or curved manner without contacting it. Fig. 10 shows a plurality of substantially horizontally extending protective ribs 24 of the operating unit 19. Also shown are a plurality of substantially horizontally extending protective ribs 23 of the side portions of the housing 5. The contours of the operating unit 19 and the outer housing 5 preferably engage one in the other, wherein an opening gap is created, which preferably has a width of, for example, a maximum of 2 mm. As shown in fig. 10, the structural shape serves to maintain IP30 operational protection in the area through which the actuating handle 15 is guided.

Fig. 11 shows a perspective view from above of a tool W (i.e., a screwdriver W) applied to an opening groove of an operating unit or an operating cap 19 of the load break switch 1 according to the present invention. The actuating handle 15 is in the lower off-state of the loadbreak switch 1.

Fig. 12 shows a corresponding sectional view of a side section of the housing 5 of the loadbreak switch 1. It can be seen that the introduction of a tool or screwdriver W is prevented due to the staggered arrangement of the protective ribs 23, 24. These protective ribs 23, 24 are preferably arranged in a staggered manner, so that even small screwdrivers W, which can be introduced into the respective gap at a slight incline, will hit the next protective rib 23, 24 at this location. The number of protective ribs 23, 24 provided in the operating cap 19 or in the side portion of the outer housing 5 may vary. Furthermore, the staggered geometry of the opposing protective ribs 23, 24 may vary. The interval and inclination of the respective protective ribs 23, 24 may be variously configured according to the application.

The load break switch 1 according to the invention shown in fig. 1, 2 is designed in the shape of a bar, in which a plurality of current fuses 14A, 14B, 14C can be inserted in its housing 5. The bar-shaped housing 5 of the loadbreak switch 1 can be mounted in the vertical direction on a substantially horizontally running current carrying bar SS, in particular a current busbar. After the installation of the bar-shaped housing 5, the loadbreak switch 1 is oriented substantially vertically, wherein the front side of the loadbreak switch 1 (i.e., the top side in fig. 1, 2) forms the front side of the loadbreak switch 1, at which the tool-safe operating unit 19 of the loadbreak switch 1 is also accessible to the user. In order to open the switching contact arrangement 2 located in the housing 5, the actuating handle 15 of the tool-safe operating unit 19 of the load break switch 1 is moved downward in the longitudinal direction of a vertically oriented strip-shaped housing, which strip-shaped housing 5 is mounted on the current carrying strip SS. Conversely, to switch on the switching contact arrangement 2, the actuating handle 15 of the loadbreak switch 1, which is mounted vertically on the current carrying bar SS, is moved upwards. The actuating handle 15 is preferably manually actuated by the user.

Fig. 8 shows the load break switch 1 shown in fig. 1 and 2 from above, i.e. fig. 8 shows the front side of the load break switch 1. In the mounted state of the loadbreak switch 1, the operating unit or operating cap 19 shown on the left side of fig. 8 is located at the top. Fig. 8 shows the load break switch 1 in the open state, with the actuating handle 15 in the lower switching position. In the open switch state of the load break switch 1, in which the actuating handle 15 of the tool-safe operating unit 19 is in the lower switching position, the latch 26 attached to the upper side of the housing 5 of the load break switch 1 can be pulled out of the housing 5 of the load break switch 1. Preferably, the snap-action switching device 17 of the loadbreak switch 1 is mechanically blocked by the pulled-out latch 26. In one possible embodiment, the latch 26 in its pulled-out position can be closed in a visible manner to the user by means of at least one holder lock.

The actuating handle 15 can be manually actuated in a quasi-translational movement in order to switch the loadbreak switch 1 on or off. The actuating direction of the actuating handle 15 preferably extends in the longitudinal direction of the strip-shaped housing 5. Alternatively, a motor-driven actuating rotary handle can also be provided. To switch on the loadbreak switch 1, the actuating handle 15 is moved upwards. To open the loadbreak switch 1 mounted on the current carrying bar SS, the actuating handle 15 is moved upwards. To open the installed loadbreak switch 1, the actuating handle 15 is moved downwards. The actuating handle 15 preferably engages into a corresponding contour of the snap-action switch device 17 and actuates the snap-action switch device 17 accordingly. Furthermore, a latch 26, which can be pulled out forward and is shown on the left of the upper end side of fig. 8, is located on the end side or front side of the loadbreak switch 1. In the pulled-out state of the latch 26, the snap-action switching device 17 of the loadbreak switch 1 is mechanically blocked. After the snap-action switching device 17 is blocked, the loadbreak switch 1 can no longer be switched on or off. In one possible embodiment, up to three cradle locks may be inserted into the withdrawn latch 26 to indicate the closure of the loadbreak switch 1 that is visible to the user. In one possible embodiment, the actuating handle 15 can be sealed in both the on state and the off state. Furthermore, in one possible embodiment, as shown in fig. 8, the load break switch 1 may have a mechanical cover lock 27 to lock the protective cover 25.

Fig. 13 shows a perspective view of the load break switch 1 with the fuse cover 25 open. A fuse cover 25 having a plurality of

observation windows

25A, 25B, 25C is provided on the front side of the load break switch 1. In one possible embodiment, the fuse cover 25 may cover the plurality of current fuses 14A, 14B, 14C accommodated in the housing 5. In the open switch state of the load break switch 1, which is schematically illustrated (for example in fig. 8, 13), the actuating handle 15 of the tool-safe operating unit is mechanically connected to the fuse cover 25 and can be pulled at least partially out of the snap switch device 17 of the load break switch 1 in order to open the fuse cover 25. Furthermore, the fuse cover 25 can be locked both in the on-switch state of the load break switch 1 and in the off-switch state of the load break switch 1, for example by means of a cover lock 27 shown in fig. 8.

When the load break switch 1 is off, as shown in fig. 13, the actuating handle 15 is moved to the lower switching position and is effectively transferred to the fuse cover 25, so that the actuating handle 15 in this switching position can be used to open the fuse cover 25. By opening the fuse cover 25, a user can access the fuse space within the housing 5 of the load break switch 1. For example, the fuses 14A, 14B, 14C may be NH fuses that may be inserted into the fuse contacts 13 shown (e.g., in fig. 1). Fig. 9 shows the loadbreak switch 1 from the front, with the housing 5 partially removed and the current fuse 14A inserted. Fig. 9 shows three fuse contact pairs 13 for three current fuses, of which only the first current fuse 14A located at the top is shown in the inserted position. The current fuses 14A, 14B, 14C are preferably arranged in a row in the bar-shaped housing 5 of the load interrupter switch 1 (visible in fig. 9). After the load break switch 1 is vertically mounted on a substantially horizontally extending current carrying bar SS, the current fuses 14A, 14B, 14C arranged in a row are above one another. In a preferred embodiment, the ventilation channel is located within the housing 5, and after installation, the ventilation channel extends vertically. In one possible embodiment, the ventilation duct can convey waste heat and/or switching gas upwards and discharge it into the environment on the upper end side of the housing 5 (i.e. on the left in fig. 9).

In one possible embodiment, the front side of the load break switch 1 can have at least one index indicator arranged thereon, which indicates to the user the actual switching state of the load break switch 1, i.e. the switching state of the switch contact arrangement 2 located in the housing 5, irrespective of the position of the actuating handle 15 of the tool-safe operating unit 19.

Further, inspection holes for voltage test may be provided in the

observation windows

25A, 25B, 25C of the fuse cover 25. Below the current fuses 14A, 14B, 14C that can be inserted in the housing 5 are preferably mounting channels 20, each of which has a removable protective cover in one possible embodiment.

Fig. 14 shows a sectional view for explaining one possible embodiment of such a mounting channel 20. In one possible embodiment, an insulating clamping bracket 28 can be provided in the mounting channel 20, and the clamping bracket 28 can be held in the mounting channel 20 in a force-fitting and form-fitting manner. The clamping bracket 28 shown in fig. 14 allows the loadbreak switch 1 to be mounted onto the current carrying bar SS from the front side after the fuse cover 25 is removed.

In one possible embodiment, when the actuating handle 15 is switched on, the two locking slides are also pulled through their

guide brackets

15A, 15B, said locking slides being supported in the cover and being pulled out of the cover in a translatory manner during the switching-on process. In the off-state of the loadbreak switch 1, these locking slides are fully inserted into the cover. The switch housing is located inside the loadbreak switch 1. The switch housing preferably contains a switch carriage 4, in which the switch carriage 4 is moved in a translatory manner. The orientation of the loadbreak switch 1 in the installed state is preferably vertical. Horizontal mounting of the loadbreak switch 1 is also possible. In one possible embodiment, as shown in FIG. 8, the output bars 21-i are located on the underside of the housing 5. Alternatively, the output bars 21-i or other connections may be provided at another location on the front side of the housing 5. The lines can be connected directly to the device or can be screwed down by means of cable lugs by means of accessories, such as, for example, cassette terminals or clamping connections. In one possible embodiment, a perforated or slotted input strip 16 is located on the rear side of the housing 5 and can establish electrical contact with the current carrying strip SS. The contact is preferably established by a threaded connection or a clamping connection.

For the purpose of simple mounting, the strip can be suspended on the busbar by means of an attachment, wherein the mechanical connection to the busbar SS is only subsequently established. The complete operating plane of the front side of the loadbreak switch 1 is constructed to be tool-safe (IP 30). A fuse cover 25 is provided on the front side, and the fuse cover 25 includes

observation windows

25A, 25B, 25C thereof. In one possible embodiment, the fuse cover 25 in the mounted state is supported on the underside so as to be mechanically rotatable. In the off state, the switch handle 15 is mechanically connected to the fuse cover 25, and may serve as a handle of the fuse cover 25. If the fuse cover 25 is opened using the switch handle 15, the switch handle is at least partially pulled out of the snap switch device 17 of the load break switch 1. Thus, when the fuse cover 25 is opened, the load break switch 1 can no longer be switched, thereby providing an additional safety function for the user or operator. The fuse cover 25 is preferably lockable in both the on state and the off state. In the locked state, the fuse cover 25 is fixedly connected to the bar-shaped body of the load break switch 1 or to the rest of the housing 5. Then, it is no longer possible to contact the fuses 14A, 14B, 14C accommodated in the housing 5. In one possible implementation, the closing may be achieved by a double-bit key. For each fuse 14A, 14B, 14C, an inspection hole for voltage test may be provided in the

observation window

25A, 25B, 25C of the fuse cover 25. These

viewing windows

25A, 25B, 25C are preferably partially transparent in order to be able to read also the technical data printed on the fuse.

The snap-action switching device 17 of the loadbreak switch 1 allows switching independently of the operator. In a preferred embodiment, the load break switch 1 according to the invention has an electromechanical switch contact arrangement 2. An exemplary embodiment of such a switching contact arrangement 2 is shown in fig. 6. The switching contact arrangement 2 has at least one loose contact unit 3, which loose contact unit 3 is arranged to be movable relative to the electrical switching contact 6. The loose contact unit 3 has at least one current-carrying contact 3A for carrying current after completion of the switching process, which current-carrying contact 3A is protected from losses by the sacrificial switching contact 3B during switching. For example, the loose contact unit 3 is formed by a loose contact group. The loose contact unit 3 is attached to a movable loose contact carrier, in particular a switch carriage 4 shown in fig. 1. The switch carriage 4 is movable in a translatory manner relative to at least one fixed switch contact 6 within a housing 5 of the load break switch 1. The movable switch carriage 4, which is arranged in the housing 5, can be actuated manually by means of a switching device 17. The sacrificial switch contact 3B of the loose contact unit 3 preferably has a double-cone-shaped contact roller, while the current-carrying contact 3A of the loose contact unit 3 has a cylindrical or conical contact roller. Alternatively, the contact blade of the fixed switch contact 6 may be conical or may have various contact planes. The sacrificial switch contact 3B and the current carrying contact 3A of the loose contact unit 3 are preferably both cylindrical.

As shown in fig. 6, the sacrificial switch contact 3B is attached to the movable loose contact carrier or switch carriage 4 adjacent to the current-carrying contact 3A on the side facing the electrical switch contact 6. The contact roller of the sacrificial switch contact 3B is preferably slightly longer than the contact roller of the current-carrying contact 3A. The fixed switch contact 6 preferably has curved contact sides. In the switched-on state of the switching contact arrangement 2, the current-carrying contact 3A and the sacrificial switching contact 3B of the loose contact unit 3 rest against the contact surfaces of the

contact blades

6A, 6B. In the open state of the switching contact arrangement 2, the current-carrying contact 3A and the sacrificial switch contact 3B of the loose contact unit 3 are separated from the contact surfaces of the

contact blades

6A, 6B, wherein the sacrificial switch contact 3B of the loose contact unit 3 faces the inclined contact sides 7A, 7B of the contact blades.

During the switching process from the on-state to the off-state of the switching contact arrangement 2, the current-carrying contact 3A initially separates from the contact blade of the electrical switching contact 6, and the sacrificial switching contact 3B only subsequently separates from the contact blade of the fixed switching contact 6. During the separation of the sacrificial switch contact 3B of the loose contact unit 3 from the contact blade of the electrical switch contact 6, an arc LB is formed which runs along the inclined contact sides 7A, 7B of the contact blade outwards away from the loose contact carrier 4 towards the quenching plate packet 18. The loose contact unit 3 preferably has two loose contact pairs which are spaced apart from one another by one or more spacing plates 9 and each comprise a current-carrying contact 3A and a sacrificial switch contact 3B. Fig. 5 shows an exemplary embodiment of a loose contact unit 3 or a loose contact group 3. The two loose contact pairs of the loose contact units 3 are preferably guided during the switching process by two opposing contact surfaces of the

respective contact blades

6A, 6B of the fixed switch contacts 6 of the switch contact arrangement 2.

In one possible embodiment, the loose contact carrier or switch carriage 4 has two loose contact units 3 arranged thereon, each loose contact unit 3 being composed of two loose contact pairs, each of which comprises a current-carrying contact 3A and a sacrificial switch contact 3B. The two loose contact units 3 are preferably attached to the loose contact carrier or switch carriage 4 in a symmetrical manner on both sides and are guided during switching by the opposing contact surfaces of the two respectively symmetrically arranged

contact blades

6A, 6B of the associated fixed switch contact 6 of the switch contact arrangement 2. In one possible embodiment, the loose contact unit 3 is supported elastically in a switching carriage or a loose contact carrier 4. Alternatively, the contact roller is elastically supported within the contact unit 3.

The fuses 14A, 14B, 14C which can be inserted in the load break switch 1 can preferably be switched in the current path in each case by means of at least one switching contact arrangement 2 shown (for example in fig. 6). The fuses 14A, 14B, 14C are inserted into two opposing fuse contacts 13 of the fuse contact pair. Preferably, the fuse contacts 13 of the fuse contact pair are each electrically connected to a fixed switch contact 6 of the switch contact arrangement 2, which fixed switch contact 6 is arranged in the housing 5 of the load break switch 1. The switch carriage 4 carries the loose contact units 3 of the respective switching devices 2 and, when actuated, moves them in a translatory manner relative to the switch contacts 6 of the switching contact devices 2 in order to close or open the respective current paths, the switch contacts 6 being fixedly arranged in the housing 5.

The load break switch 1 shown in fig. 1, which comprises an NH fuse designed in the shape of a bar and has a snap-action switching device 17 contained therein, serves to switch the currents of a plurality of current phases L1, L2, L3 in an operator-independent and user-safe manner. The loadbreak switch 1 can be mounted on a plurality of horizontally oriented and parallel-running current bars SS, in particular current bars. During switching on, the operator displaces the actuating handle 15 upwards in a translatory manner. After overcoming the so-called no-return point, the switching-on process is no longer influenced or interrupted by the operator, i.e. the loadbreak switch 1 is switched independently of the operator. The snap-action switching device 17 of the loadbreak switch 1 is designed such that a very high switching speed and a very high switching force are achieved. This is advantageous for extinguishing the generated arc LB as quickly as possible during switching under load and thus minimizing losses to the switching contacts. The switching contacts of the switching contact arrangement 2 are preferably designed such that during the opening the respective current phases L1, L2, L3 at the two positions are interrupted simultaneously, i.e. a so-called double opening is achieved. In the open state of the loadbreak switch 1, therefore, the fuses 14A, 14B, 14C can be safely replaced, since the fuse contacts 13 on the front side of the switching device accessible to the user do not have any potential after the double disconnection has been achieved. The housing 5 can have different structural widths. For the NH00 embodiment, for example, the shell 5 may be 50mm wide, and for the NH1-3 embodiment, for example, the shell may be 100mm wide.

Fig. 15 schematically illustrates an exemplary embodiment of a current distribution system according to further aspects of the present invention. As can be seen from fig. 15, the load break switches 1-1, 1-2, 1-3 are mounted on a plurality of current busbars SS1, SS2, SS3 arranged substantially in parallel, according to a first aspect of the invention. The current bus bar or current carrier bar SS extends substantially horizontally. The loadbreak switches 1-i have a strip-shaped housing 5 and are mounted vertically on a current carrying strip SS. The current distribution system allows flexible placement of the loadbreak switches 1-i on the bus bar. Furthermore, the fuse loadbreak switches are placed on the current busbars such that, for example, as shown in fig. 15, their housings 5 abut against one another for the fuse loadbreak switches 1-2, 1-3. Furthermore, in the current distribution system according to the invention, the load break switches 1-i are flexibly installed in a hybrid manner in a further switchgear, for example, as shown in fig. 15, which has a fuse load break switch SLT. Further modular switching devices may be mounted in the vertical direction on a substantially horizontally extending current bus bar SS and may contain, for example, adapters or measuring modules. In one possible embodiment, the load interrupter switches 1-i can have insertable current fuses which are arranged one above the other in a row after the load interrupter switches 1 have been mounted on the horizontally extending current bars SS. In the housing 5 of the installed loadbreak switch 1, the ventilation duct integrated therein preferably extends vertically and discharges waste heat and/or switching gas upwards. As can be seen in fig. 15, the current distribution system or low voltage distribution system of the present invention does not require any vertically extending current carrying bars or current bus bars SS. All devices or switchgear, including the loadbreak switches 1-i, are preferably mounted in a vertical orientation on horizontally extending current carrying or current bus bars SS1, SS2, SS 3. This saves a lot of space, for example in a switchgear cabinet. In one possible embodiment, semicircular heat channel recesses for the removal of heat and/or for the removal of exhaust gases can also be provided on the longitudinal sides of the housing 5 of the load break switch 1, which recesses, together with the housing 5 of the switching device arranged next to them, form a circular duct extending in the vertical direction. In one possible embodiment, carrier elements or positioning hooks can be used for the pre-positioning of the strip-shaped housing 5 on the carrier strip SS. The load break switch 1 is particularly suitable for switching high currents (e.g., in the current range of 100 to 700 amperes) and/or high voltages (e.g., in the voltage range of 400 to about 700 volts).

List of reference numerals

1 load break switch

2 contact arrangement

3 loose contact group

3A current-carrying contact

3B sacrificial switch contact

4 loose contact unit

5 casing

6 switch contact

7A, 7B contact side

8A, 8B contact

9 baffle plate

10 spring

11 roller tube

12 frame

13 fuse contact

14A, 14B, 14C current fuse

15 actuating handle

16 input bar

17 quick-acting switch device

18 arc extinguishing plate bag

19 operating unit

20 installation channel

21 output strip

22S-shaped bulge

23 protective Rib

24 protective rib

25 fuse cover

25A, 25B, 25C observation window

26 latch

27 cover lock

28 clamping support driver

Claims

1. A load break switch (1), wherein a switch contact arrangement (2) is provided for each current phase (L), which switch contact arrangement (2) is connected to an associated input bar (16), which input bar (16) is arranged on a rear side of a housing (5) of the load break switch (1) for establishing an electrical contact with a current carrying bar (SS), wherein the switch contact arrangement (2) is switchable by a tool-safe operating unit (19) of the load break switch (1), which tool-safe operating unit (19) is attached to a front side of the housing (5), wherein the tool-safe operating unit (19) has an actuating handle (15) with two guide brackets (15A, 15B), which two guide brackets (15A, 15B) are connected to a quick-action switching device (17) for switching at least one switch contact arrangement (2) independently of an operator, wherein the guide brackets (15A, 15B) of the actuating handle (15) of the tool-safe operating unit (19) are guided along a plurality of protective ribs (23, 24) in associated lateral portions of a bar-shaped housing (5) of the load-break switch (1).

2. The load break switch according to claim 1, wherein for each current phase (L) an associated current fuse (14A, 14B, 14C) can be inserted into the housing (5) of the load break switch (1).

3. The load-break switch according to claim 1, wherein the housing (5) of the load-break switch (1) is designed in the shape of a bar, a plurality of current fuses (14A, 14B, 14C) for different current phases (L1, L2, L3) being arranged side by side in the housing (5).

4. The load break switch according to claim 1, wherein said protective ribs (23, 24) are arranged staggered with respect to each other such that a tool (W) cannot be introduced into the inner space of said housing (5) of said load break switch (1).

5. The load break switch according to claim 1, wherein the guide brackets (15A, 15B) of the actuating handle (15) of the tool-safe operating unit (19) each have at least one S-shaped projection which surrounds at least one associated protective rib (23, 24) without touching it.

6. The load break switch according to claim 1, wherein the switch contact arrangements (2) each have at least one switch contact (6) fixedly arranged in a housing (5) of the load break switch (1) and at least one loose contact unit (3) attached to a loose contact carrier (4).

7. The load break switch according to claim 6, wherein the loose contact carrier (4) has a switch carriage which is movable in a translatory manner in the longitudinal direction of the bar-shaped housing (5) of the load break switch (1) by the snap-action switching device (17) of the load break switch (1) during actuation of an actuation handle (15) of the tool-safe operating unit (19).

8. A load break switch according to claim 3, wherein the strip-shaped housing (5) of the load break switch (1) is mountable in a vertical direction on a substantially horizontally extending current carrying strip (SS).

9. The load break switch according to claim 8, wherein the actuating handle (15) of the tool-safe operating unit (19) of the load break switch (1) is movable downwards in the longitudinal direction of the bar-shaped housing (5) of the load break switch (1) to open the switch contact arrangement (2) and is movable upwards in the longitudinal direction of the bar-shaped housing (5) of the load break switch (1) to close the switch contact arrangement (2), wherein the bar-shaped housing (5) is mounted vertically on the current carrying bar (SS).

10. The load break switch according to claim 9, wherein in an open switch state of the load break switch (1) with the actuating handle (15) of the tool-safe operating unit (19) in a down-switch position, a latch (26) attached to an upper end side of the housing (5) of the load break switch (1) can be pulled out of the housing (5) of the load break switch (1), the latch in the pulled-out position mechanically blocking the snap-action switching device (17) of the load break switch (1).

11. The loadbreak switch of claim 10, wherein the latch (26) in the pulled-out position is visually closeable by at least one cradle lock.

12. The load break switch according to claim 1, wherein a flag indicator is provided which indicates the actual switch state of the load break switch (1) irrespective of the position of the actuating handle (15) of the tool-safe operating unit (19).

13. The load break switch according to claim 1, wherein a fuse cover (25) having an observation window (25A, 25B, 25C) is provided at a front side of the load break switch (1) and covers the current fuse (14A, 14B, 14C) accommodated in the housing (5).

14. The load break switch according to claim 13, wherein in the off-state of the load break switch (1) the actuating handle (15) of the tool safe operating unit (19) is connected to the fuse cover (25) and can be pulled out of the snap switch device (17) of the load break switch (1) to open the fuse cover (25).

15. The load break switch according to claim 13, wherein the fuse cover (25) is lockable in both an on-switch state of the load break switch (1) and an off-switch state of the load break switch (1).

16. The load break switch according to claim 13, wherein the observation window (25A, 25B, 25C) of the fuse cover (25) has an inspection hole for voltage testing.

17. The load break switch according to claim 2, wherein mounting channels (20) are each provided within the housing (5) of the load break switch (1) below the current fuses (14A, 14B, 14C) insertable in the housing (5), the mounting channels each having a removable protective cover.

18. Load break switch according to claim 17, wherein said mounting channel (20) of said housing (5) of said load break switch (1) extends through an elongated opening in said switch carriage, said switch carriage being translationally movable within said housing (5).

19. The load break switch according to claim 2, wherein said current fuses (14A, 14B, 14C) are arranged in a row within said strip-shaped housing (5) of said load break switch (1).

20. The loadbreak switch of claim 19, wherein the current fuses (14A, 14B, 14C) arranged in a row are one above the other after the loadbreak switch (1) is vertically mounted on a substantially horizontally extending current carrying bar (SS), and a ventilation channel extending vertically within the housing (5) of the loadbreak switch (1) transports waste heat upwards and out at the upper end side of the housing (5) of the loadbreak switch (1).

21. A current distribution system, wherein both a fuse load break switch and a load break switch (1) according to claim 1 are mountable in a vertical direction on a substantially horizontally extending current carrying bar (SS).

22. The current distribution system according to claim 21, wherein the current carrying bar (SS) is a current bus bar.