EP3211648B1 - Switching contact assembly - Google Patents

Description

The invention relates to an electromechanical switching contact arrangement for a switching device, in particular for a switch-disconnector.

Switching contact arrangements are used for switching on and off of circuits or current paths. A switch contact arrangement generally has a fixed electrical switch contact with a movably arranged controllable switch contact, which can be separated from the fixed switch contact for the separation of the circuit. For safety of the current flowing through the circuit current is a switch contact assembly during operation, especially when switching on and off, exposed loads. Above all, in a turn-off, in which the movable switching contact is separated from the fixed switching contact, an arc may occur, which can lead to a burn-up and thus to the partial destruction of the electrical switching contacts in the still live contacts. Especially in a contact arrangement, which is relatively frequently switched during operation and is exposed to relatively high current flows, thereby the operating life of the contact arrangement is considerably reduced.

EP0100699 discloses an electromechanical switch contact arrangement with at least one loose contact unit, which is arranged to be movable relative to a switch contact, wherein the Loskontakteinheit has at least one current-carrying contact for power conduction after completion of a switching operation, which is protected by a switch sacrificial contact from wear during the switching operation, wherein the Loskontakteinheit to a movable along a movement axis movable Loskontaktträger is mounted, wherein the fixed switching contact has a knife-shaped contact edge, wherein the contact edge is an inclined with respect to the movement axis contact edge, wherein in an off state of the switching contact arrangement of the switching sacrificial contact and the current-carrying contact of the knife-shaped Contact edge of the switch contact are completely separated.

It is therefore an object of the present invention to provide a switch contact arrangement, which is largely protected against burn and has a correspondingly long service life.

This object is achieved according to a first aspect by a switch contact arrangement with the features specified in claim 1.

The invention accordingly provides a switching contact arrangement with at least one loose contact unit, which is arranged to be movable relative to a switching contact, wherein the Loskontakteinheit at least one current-carrying contact for power management after completion of a switching operation, which is protected by a switching sacrificial contact from wear during the switching process.

In a possible embodiment of the contact arrangement according to the invention, the Loskontakteinheit is a Loskontaktpaket.

The Loskontakteinheit is attached to a movable Loskontaktträger.

In a further possible embodiment of the contact arrangement according to the invention, the movable Loskontaktträger is a switching carriage, which is translationally movable within a housing relative to the at least one electrical switching contact.

In a further possible embodiment of the contact arrangement according to the invention provided in the housing movable Loskontaktträger by means of a switching mechanism is manually operable.

In a further possible embodiment of the contact arrangement according to the invention, the switching sacrificial contact of the Loskontakteinheit is a double conical contact roller. In a further possible embodiment of the contact arrangement according to the invention, the current-carrying contact of the loose contact unit is a cylindrical or a conically shaped contact roller.

In a further possible embodiment of the contact arrangement according to the invention, the electrical switching contact on a contact blade, which is conical, wherein both the switching sacrificial contact and the current-carrying contact of the Loskontakteinheit are cylindrical.

The switch sacrificial contact is mounted next to the current-carrying contact on the movable Loskontaktträger on the electrical switching contact side facing.

In a further possible embodiment of the contact arrangement according to the invention, the contact roller of the switching sacrificial contact is designed to be longer than the contact roller of the current-carrying contact.

The electrical switching contact has at least one fixedly arranged within a housing contact blade.

In a further possible embodiment of the contact arrangement according to the invention, in a switched-on state of the contact arrangement, the current-carrying contact and the switching sacrificial contact of the loose contact unit are in contact with a contact surface of the contact blade.

In a further possible embodiment of the contact arrangement according to the invention are in an off state of the contact arrangement of the current-carrying contact and the switching sacrificial contact of the Loskontakteinheit separated from the contact surface of the contact blade, wherein the switching victim contact the Loskontakteinheit an inclined contact side or contact edge of the contact blade faces.

In a further possible embodiment of the contact arrangement according to the invention, a separation of the current-carrying contact from the contact blade takes place during a switching operation from the switched-on state of the contact arrangement into the switched-off state of the contact arrangement and then a separation of the switching sacrificial contact of the contact blade.

In a further possible embodiment of the contact arrangement according to the invention forms in the separation of the switching sacrificial contact of the Loskontaktpaketes of the contact blade of the electrical switching contact an arc, which migrates along the oblique contact side of the contact blade away from the Loskontaktträger outwardly to a splitter stack out.

In a further possible embodiment of the contact arrangement according to the invention the Loskontaktpaket comprises two spaced by a spacer sheet Loskontaktpaare, each comprising a current-carrying contact and a switching sacrificial contact.

In a further possible embodiment of the contact arrangement according to the invention, the two Loskontaktpaare a Loskontakteinheit are guided in a switching operation of the contact arrangement on the two opposite contact surfaces of the contact blade.

In a further possible embodiment of the contact arrangement according to the invention at least two Loskontakteinheiten are provided on the Loskontaktträger the contact arrangement, each consisting of two Loskontaktpaaren, which in turn each comprise a Stromführungskontakt and a switching sacrificial contact,
wherein the two Loskontakteinheiten are symmetrically attached to both sides of the Loskontaktträger the contact assembly and are guided during a switching operation of the contact arrangement on the opposite contact surfaces of two symmetrically arranged corresponding contact blades of the electrical switching contact of the contact arrangement.

In a further possible embodiment of the contact arrangement according to the invention, the Loskontakteinheiten the contact arrangement are resiliently mounted in the Loskontaktträger the contact arrangement.

In a further possible embodiment of the contact arrangement according to the invention, contact rollers which form the switching sacrificial contacts and / or current-carrying contacts are resiliently mounted in the respective contact unit.

The invention further provides, according to a further aspect, a switching device with at least one switching contact arrangement according to the first aspect of the invention.

According to a further aspect, the invention provides a switch-disconnector with at least one insertable fuse which can be switched into a current path by means of at least one switch contact arrangement according to the first aspect of the invention.

In one possible embodiment of the switch-disconnector according to the invention, the fuse, in particular an NH fuse, can be inserted into two opposite fuse contacts provided in a housing of the switch-disconnector, the two fuse contacts each having a provided in the housing of the circuit breaker provided electrical switching contact of the switch contact arrangement according to the first Aspect of the invention are electrically connected.

In a possible embodiment of the circuit breaker according to the invention a manually operable movable switching carriage is provided as a load contact carrier in the housing of the circuit breaker, which carries the Loskontakteinheiten the contact arrangements and relative to the fixed in the housing of the circuit breaker electrical switching contacts of the contact assemblies upon actuation of the switching slide to close or disconnect the respective over the fuse leading current path is movable.

The invention provides according to a further aspect, a circuit breaker with at least one switching contact arrangement according to the first aspect of the invention.

In the following, possible embodiments of the switching contact arrangement according to the invention for a switching device, in particular for a switch-disconnector, will be explained in more detail with reference to the accompanying figures.

Fig. 1

zeigt eine perspektivische Ansicht auf eine mögliche Ausführungsform eines Lasttrennschalters, der in seinem Gehäuse erfindungsgemäße Schaltkontaktanordnungen enthält;

Fig. 2

zeigt eine Frontalansicht auf den in Fig. 1 dargestellten Lasttrennschalter mit geöffnetem Gehäuse;

Fig. 3

zeigt eine perspektivische Detailansicht auf das in Fig. 1 dargestellte Ausführungsbeispiel eines Lasttrennschalters mit erfindungsgemäßen Schaltkontaktanordnungen;

Fig. 4

zeigt eine perspektivische Ansicht auf einen in dem Lasttrennschalter gemäß Fig. 3 verwendeten Schaltschlitten als Loskontaktträger einer erfindungsgemäßen Schaltkontaktanordnung;

Fig. 5

zeigt ein Ausführungsbeispiel eines bei der erfindungsgemäßen Schaltkontaktanordnung verwendbaren Loskontaktpaketes bzw. Loskontakteinheit;

Fig. 6

zeigt ein Ausführungsbeispiel der erfindungsgemäßen Schaltkontaktanordnung, welche die in Fig. 5 dargestellte Loskontakteinheit verwendet.

Show it:

Fig. 1

shows a perspective view of a possible embodiment of a circuit breaker, which contains in its housing according to the invention switch contact arrangements;

Fig. 2

shows a frontal view on the in Fig. 1 shown load-break switch with open housing;

Fig. 3

shows a perspective detail view of the in Fig. 1 illustrated embodiment of a circuit breaker with switching contact arrangements according to the invention;

Fig. 4

shows a perspective view of a in the switch-disconnector according to Fig. 3 used switching carriage as Loskontaktträger a switch contact arrangement according to the invention;

Fig. 5

shows an embodiment of a usable in the inventive switch contact arrangement Loskontaktpaketes or Loskontakteinheit;

Fig. 6

shows an embodiment of the switching contact arrangement according to the invention, which the in Fig. 5 shown Loskontakteinheit used.

Fig. 1 shows an embodiment of a switching device 1, in particular a load-break switch 1, which inventive switch contact arrangements for switching on and off of circuits or current paths used. An exemplary embodiment of such a switch contact arrangement 2 is shown in FIG Fig. 6 shown. The switching contact arrangement 2 has in the illustrated embodiment, a Loskontakteinheit 3 and a Loskontaktpaket 3, as shown in Fig. 5 is shown. The Loskontakteinheit 3 is mounted in the illustrated embodiment of a Loskontaktträger 4, as in Fig. 6 is shown. At the in Fig. 6 shown Loskontaktträger 4 is a switching slide of the circuit breaker 1, the perspective in Fig. 4 is shown. The shift carriage 4 is arranged to be translationally movable within the housing 5 of the load-break switch 1. In addition to the Loskontaktpaket or the Loskontakteinheit 3, the contact assembly 2 has an electrical switching contact 6, which is preferably arranged or mounted firmly in the housing 5 of the switching device 1 and the circuit breaker 1. The Loskontaktträger or the shift carriage 4 is translationally movable along an axis A, as in Fig. 6 is shown. At the Loskontaktträger 4 at least one Loskontaktpaket 3 is attached. At the in Fig. 6 illustrated embodiment, the electrical fixed switch contact 6 is formed symmetrically to the axis A and has on both sides a contact blade 6A, 6B. Furthermore, the electrical fixed switching contact of the switching contact arrangement 2 has two brackets 6C, 6D connected to the associated contact blade 6A, 6B. The Loskontaktpaket or the Loskontakteinheit 3 is arranged relative to the electrical switching contact 6 with its two contact blades 6A, 6B movable and can be moved translationally by means of the Loskontaktträgers 4 along the axis A. The Loskontaktpaket 3rd has at least one current-carrying contact 3A for current conduction after completion of a switch-on, which is protected by an associated switching sacrificial contact 3B from wear, especially during a switch-off. The provided in the housing 5 of the switch-disconnector 1 switching carriage 4, which forms the Loskontaktträger for the Loskontaktpakete 3 is movable within the housing 5 relative to the electrical switching contacts 6 translationally along the axis A. Here, the movably arranged Loskontaktträger or shift carriage 4 is preferably manually actuated by means of a switching mechanism by a user. The switch sacrificial contact of the Loskontakteinheit 3 has in a preferred embodiment, a double conical contact roller. The current-carrying contact 3A of the Loskontaktpaketes 3 may be a cylindrical or conically shaped contact roller. As in Fig. 6 recognizable, the switching sacrificial contact 3B of the Loskontakteinheit 3 next to the current-carrying contact 3A of the Loskontakteinheit 3 to the movable Loskontaktträger 4 on the electrical switching contact 6 with its two contact blades 6A, 6B facing side attached. Fig. 6 shows the contact assembly 2 in the off state, in which both the current-carrying contact 3A and the switching sacrificial contact 3B of the Loskontaktpaketes 3 are completely separated from the fixed electrical contact 6 with its two contact blades 6A, 6B. The contact roller of the switching sacrificial contact 3B is preferably longer than the contact roller of the current-carrying contact 3A of the Loskontakteinheit. 3

In an activated state of the contact arrangement 2, both the current-carrying contact 3A and the switch sacrificial contact 3B of the Loskontaktpaketes or the Loskontakteinheit 3 to a surface or contact surface of the contact blades 6A, 6B of the electrical switching contact 6 and carry an electrical current within a circuit or a current path. In contrast, in an off state of the switching contact arrangement 2, as he also in FIG. 6 is shown, both the current-carrying contact 3A and the switching sacrificial contact 3B of the Loskontakteinheit 3 completely separated from the contact surfaces or surfaces of the contact blades 6A, 6B of the electrical switching contact 6. In the switched-off state of the contact arrangement 2, the switching sacrificial contact 3B of the loose contact unit 3 faces a contact side or contact flank 7A, 7B of the two contact blades 6A, 6B of the electrical switching contact 6 that runs obliquely with respect to the movement axis A.

During a switching operation from the switched state of the switching contact arrangement 2 in the switched-off state of the switching contact arrangement 2, the Loskontaktträger or switching slide 4 moves in Fig. 6 along the axis of movement A to the right, initially a separation of the current-carrying contact 3A of the contact blades 6A, 6B and then a separation of the switching sacrificial contact 3B of the Loskontakteinheit 3 of the contact blades 6A, 6B of the electrical switching contact 6 takes place. Only at the separation of the switching sacrificial contact 3B of the Loskontaktpaketes 3 of the contact blades 6A, 6B forms along the two inclined contact sides 7A, 7B of the contact blades 6A, 6B each have an arc LB, the away from the axis of movement A outwards to a in Fig. 6 not shown arc splitter package moves towards. The electrical switching contact or fixed contact 6 is in the in Fig. 6 illustrated embodiment as a blade contact with two blade contact surfaces 6A, 6B formed. When switching the switching contact arrangement 2 according to the invention, the switching slide or Loskontaktträger 4 with the attached thereto at least one Loskontaktpaket 3 translationally along the movement axis A in the direction of the blade contact 6, ie in Fig. 6 moved to the left, so that both the current-carrying contact 3A and the switch sacrificial contact 3B in the end position on the surface of the contact blade surfaces 6A, 6B firmly abut and close the associated circuit safely and with low electrical resistance. In one possible embodiment arises at a switch-off only after the switch sacrificial contact 3B has been separated from the contact blades 6A, 6B, at a defined by the geometry of the contact blade 6A, 6B point 8A, 8B, an arc LB, in the course of the turn-off of this point 8A, 8B Outwardly away from the axis of movement A along the oblique line of contact 7A, 7B outwardly migrates towards an associated splitter stack. The point at which the arc LB forms or ignites is located at the in Fig. 6 illustrated embodiment at a break point of the extinguishing packet 3 facing side or flank of the two contact blades 6A, 6B of the electrical switching contact or blade contact 6. When switching the switching contact arrangement 2, the shorter cylindrical roller 3A, which serves as a current-carrying contact, on the in Fig. 6 shown hatched areas of the contact blades 6A, 6B of the blade contact 6 out. Since the resulting arc LB migrates outwardly from the break points 8A, 8B during the turn-off operation, the hatched areas of the contact blades 6A, 6B are not touched by the resulting arc LB and remain in their original state of manufacture. The arc LB is formed at the two Abknickpunkten 8A, 8B after lifting the switch sacrificial contact 3B between the contact blade surfaces 6A, 6B and the switch sacrificial contact 3B and migrates with increasing opening distance to the outside to the two sides mounted splitter stack the contact assembly. 2 These splitter plate packages ensure that the arcing LB generated when switching off under load is limited and extinguished. With increasing opening travel of the contact arrangement 2, the splitter plate packages are between the Loskontaktpaket 3 and the first blade contact 6 and provide an increase in resistance and ultimately to a tearing of the arc LB. The arc intensity is reduced by the increase in resistance, and ultimately the arc LB is completely extinguished by the splitter stack.

In a preferred embodiment, the switch sacrificial contact 3B has a double conical shape with an angle of, for example, 1 ° to 10 °. Due to this double conical shape results in a defined point at which the arc LB ignites. Due to the slightly greater length of the contact roller of the switching sacrificial contact 3B compared to the current-carrying contact 3A results in a defined area or a defined area on the contact blades 6A, 6B, which is not or only slightly damaged by the arc LB. In this in Fig. 6 hatched area shown contacts the short contact roller of the current-carrying contact 3A after completion of the switch-on the contact blade. As a result, a good electrical contact between the contact roller of the current-carrying contact 3A and the contact blades 6A, 6B of the blade contact 6 is ensured even after several or a plurality of switching operations. In a further alternative embodiment, the contact blades 6A, 6B of the electrical switching contact are conical, while both the switching sacrificial contact 3B and the current-carrying contact 3A of the Loskontaktpaketes 3 are cylindrical.

The contact blade 6 of the contact arrangement 2 has a bracket 6C, which in one possible embodiment is electrically connected to another switching contact, for example a fuse contact, for receiving a fuse. Furthermore, the in Fig. 6 shown contact blade via another bracket 6D, which, for example, to an access rail of in Fig. 1 can apply shown switching device 1. The contact blade 6 or the electrical switching contact 6 consists in a preferred embodiment of copper material. In one possible embodiment, the electrical switching contact 6 may also be coated with silver to improve the conductivity. The oblique edge or flank 7A, 7B of the two contact blades 6A, 6B, along which during the switching operation of the arc LB. runs, preferably has an angle α in an angular range of 20 ° to 30 °.

Fig. 5 shows a possible embodiment of a used in the switching contact assembly 2 according to the invention Loskontaktpaketes or Loskontakteinheit 3. In the in Fig. 5 illustrated embodiment, the Loskontakteinheit 3 comprises two spaced by a spacer sheet 9 Loskontaktpaare 3A, 3B, each comprising a Stromführungskontakt 3A and a switching sacrificial contact 3B. The two Loskontaktpaare the Loskontakteinheit 3 are performed in a switching operation on the two opposite contact surfaces of the two corresponding contact blades 6A, 6B. When switched on the two contact blades 6A, 6B of the electrical switching contact 6 between the two symmetrically arranged Loskontaktpaaren 3A, 3B of the Loskontakteinheit 3. In the in Fig. 5 illustrated embodiment, the Loskontakteinheit 3 thus has four Loskontakte, namely two switching sacrificial contacts 3 B and two Stromführungskontakte 3A, which can be preferably taken in a basket and are resiliently loaded. In the Fig. 5 shown Loskontakteinheit 3 preferably forms a closed assembly and is thus ideal for mounting in a switching device. The two short current-carrying contacts 3A, 3B serve to conduct electricity and are not loaded during a switching operation by arc LB. The two slightly longer switching sacrificial contacts 3B are charged in contrast during a switching operation by an arc LB. In the Fig. 5 shown Loskontakteinheit 3 can be performed on both sides and is locked during assembly, for example in the shift carriage 4. This in Fig. 5 Using the spacer plate 9 of the Loskontakteinheit 3 can be made to adapt to the thickness of the blade contact or its blade contact surfaces 6A, 6B. The Loskontakteinheit 3 is implemented such that in the on state of the contact arrangement 2 as little mechanical force on the Loskontaktträger or the shift carriage 4 is exercised.

In the Fig. 6 illustrated switching contact arrangement 2 is constructed symmetrically to the movement axis A. This offers the advantage that a possible flow of current via the switching contact arrangement 2 is split into two current paths, namely a current path via the first contact blade surface 6A and a current path via the second contact blade surface 6B of the blade contact 6. The distribution of the current also causes the locally generated heat reduced and can be better dissipated within the switching device 1. In addition, by dividing the current into two current paths, the electrical current flowing locally through the two arcing LBs can be reduced. The contact rollers 3A, 3B of the Loskontakteinheit 3 are preferably easily mounted or mounted. As a result, the mechanical resistance is lowered during a switching operation. The contact rollers 3A, 3B may be incorporated in roller baskets 11, which are attached to a frame 12 of the Loskontakteinheit 3. The introduction of the bearing shells or rolling contact baskets serves to make maximum use of the radius of rotation of the contact rollers. This results in a much easier turning behavior in the Loskontakteinheit 3 with constant contact force. As in Fig. 5 shown, the compression spring 10 presses the two Loskontaktpaare within the frame 12 upwards so that they can be performed on the contact blade surfaces 6A, 6B during a switching operation. This results in a displacement of the guide surfaces to the outside, for example, to reduce a tilting game. The contact rollers 3A, 3B of the Loskontakteinheit 3 consist in a possible embodiment of copper and are optionally also coated to increase the conductivity with a silver layer.

Fig. 4 shows in perspective a view of an insertable within the housing 5 of the circuit breaker 1 switching carriage 4 as Loskontaktträger. How to get in Fig. 4 recognize can, are in the shift carriage 4 twelve Loskontaktpakete or Loskontakteinheiten 3, as shown in Fig. 5 is shown used. The Loskontaktpakete 3-i are preferably inserted in a form-fitting manner in the shift carriage 4. The arranged in the housing 5 of the switch-disconnector 1 shift carriage 4 can preferably be operated manually by means of an operating lever via a snap-action mechanism by a user. In this case, the shift carriage 4 moves along the movement axis A translationally within the housing 5. In one possible embodiment, the load-break switch 1 has three NH fuses for three current phases L1, L2, L3. In a possible embodiment variant, each of the three NH fuses of the circuit breaker 1 is interrupted on both sides by two corresponding switching contact arrangements 2 when switched off. Accordingly, in this embodiment, in the switch-disconnector 1 six switch contact arrangements 2 are provided. Each of the six switching contact assemblies 2 has two symmetrical within the switching slide 4 associated Loskontaktpakete 3-i. The Loskontaktpakete 3-1, 3-2 are, as in Fig. 4 represented, arranged symmetrically to the movement axis A and form part of a first electrical contact arrangement 2. Accordingly, the other five contact arrangements 2 are symmetrical.

Fig. 1 shows in perspective an embodiment of a switch-disconnector 1 with a housing 5 in which the in Fig. 4 shown switching slide 4 with the twelve Loskontaktpaketen or Loskontakteinheiten 3-1 to 3-12 used therein. The twelve Loskontaktpakete 3-i form part of six switching contact assemblies 2, which interrupt NH fuses when turning off the circuit breaker 1 on both sides. At the in Fig. 1 illustrated embodiment of the circuit breaker 1 six fuse contacts 13-1 to 13-6 for three NH fuses 14A, 14B, 14C are provided. In Fig. 1 only one of the three NH fuses 14A, 14B, 14C is shown, namely the fuse 14A, which is inserted into the two fuse contacts 13-1, 13-2. Another NH fuse 14B (not shown) may be inserted between the two fuse contacts 13-3, 13-4. A third contactor 14C, also not shown, can be inserted between the fuse contacts 13-5, 13-6 in the switch-disconnector 1. The fuse contacts 13-i are each provided with a contact clip 6C of an electrical blade contact 6, as shown in FIG Fig. 6 is shown, electrically connected. How to get in Fig. 1 can recognize, the contact blades 13-i are also implemented as a double contact blade. In a preferred embodiment, the NH fuse contacts 13-i and the electrical switch contacts 6 of the switch contact assembly 2 are integrally formed, ie, the fuse contacts 13-i are integrally connected to the bracket 6C of the contact blade 6. As a result, contact and connection points can be saved, which leads to a reduction in the device power loss. In addition, the assembly process is facilitated since the fuse contacts 13-i and the electrical switching contacts 6 are integrally formed. Alternatively, the NH fuse contacts 13-i and the contact blades 6 of the switch contact arrangement 2 can be formed within the load-break switch 1 by two separate components which abut each other electrically to conduct current. This embodiment variant offers the advantage that the NH fuse contacts 13-i and the electrical switch contacts 6 or blade contacts can be variably arranged relative to one another, whereby the space available through the housing 5 can be optimally utilized. On the housing 5 of the circuit breaker 1, an operating handle 15 is provided in the illustrated embodiment, which is manually actuated by a user. The operating handle 15 is located on the front of the circuit breaker 1. On the back of the circuit breaker 1 are for each of the power phases L perforated or slotted access rails 16-1, 16-2, 16-3, as in Fig. 1 shown. These access rails 16-i are preferably each with a contact clip 6D of the in Fig. 6 illustrated contact blade 6 of the invention Contact arrangement 2 electrically connected. At the in Fig. 1 illustrated embodiment, the access rails 16-i are used for electrical contacting with busbars of a busbar trunking system or other current-carrying rails. The contacting can be done either with a screw or with a clamp connection. For easy installation, the load-break switch 1 can be suspended on the busbars via an accessory and only then does a mechanical connection with the busbars take place. This in Fig. 1 illustrated switching device 1 has a strip shape, in which a plurality of fuses 14A, 14B, 14C are arranged in a row one above the other. The switching device or the switch-disconnector 1 preferably has an actuatable by the operating lever 15 snap-action mechanism 17 for user-independent and safe for the user switching of several electrical currents or current phases L1, L2, L3. This in Fig. 1 Switching device 1 shown can be preferably placed vertically on a busbar system with a plurality of horizontally aligned and parallel current busbars of different types. To switch off or interrupting the current phases L1, L2, L3 is pulled by a user or user of the shift lever 15 down so that the Loskontaktpakete or Loskontakteinheiten 3 of the contact assembly. 2 from the contact blades 6 of the contact assembly 2 separate. Fig. 1 shows the switching device or the circuit breaker 1 in the off state. The switching device 1 can be mounted on busbars or other rails, for example by means of screws or clamps. In this case, the switching device 1 is preferably designed such that the access to the screws or clamps with a tool and only by a tunnel-like construction within the housing 5, which leads through the switching slide 4, is possible. As in Fig. 4 can be seen, the shift carriage 4 preferably provided for openings 17-1, 17-2, 17-3. The tunnels intended for installation are also lockable at the front, so that no contact of the current-carrying busbars by the user is possible in the off state of the switching device 1. To switch on the load switch bar 1, the control handle 15 by the user or operator translatorily upward, ie in Fig. 1 to the left, moved. After overcoming a certain mechanical switching point (point of no return), the switch-on process can no longer be influenced or aborted by the operator, ie an operator-independent switching takes place. Switching off the switch-disconnector 1 is analogous in the reverse direction, ie by operating the shift lever 15 by the operator down, ie in Fig. 1 to the right. The snap-action mechanism 17 of the load-break switch 1 is preferably designed such that a very high switching speed and high switching force is achieved. This is advantageous in order to extinguish the resulting arc LB as quickly as possible during switching under load and thus to minimize the wear of the switching contacts of the switching contact arrangement 2.

The orientation of the switching device 1 and the switch-disconnector 1 in strip form is preferably in the vertical direction, ie perpendicular to the horizontally extending current-carrying rails. A horizontal installation of the in Fig. 1 shown switching device 1 is also possible. The current flow direction is usually starting from the busbars to the switching device, ie the switching device 1 is preferably used as a departure device. A reverse current direction is also possible.

The switching contact assemblies 2 within the circuit breaker 1 are designed so that when switching off the respective phases L1, L2, L3 of the current path is interrupted at two points by means of two switching contact arrangements 2, ie by so-called double interruption. As a result, a safe replacement of the fuses 14A, 14B, 14C is possible in the off state of the circuit breaker 1, since the from the user or customer accessible fuse contacts 13-i on the front of the switching device 1 are potential-free.

The connection of lines can be done on the underside of the device or in an alternative embodiment, also on the top of the device, such as front, of the switching device 1. The cables can be connected directly to the device with accessories, such as box terminals or clamp connections, or screwed on using cable lugs.

The front of the switching device 1, ie the in Fig. 1 overhead side of the housing 5, represents the operating level of the switching device or the circuit breaker 1. This operating level is preferably tool-safe (IP30) configured. On the front side is preferably a fuse cover with viewing windows. The fuse cover is preferably rotatably mounted below in the installed state. In the switched-off state of the circuit breaker 1 of the pulled down handle 15 is firmly connected to the fuse cover and can thus serve as a handle for opening the fuse cover. If the fuse cover is opened with the switching handle 15, the switching handle 15 can preferably be pulled out of the snap-action mechanism 17 for opening the rotatably mounted safety cover. As a result, the load-break switch 1 can not be switched when the fuse cover is open, creating an additional safety function for the operator. In the housing 5 of the switching device 1 is the switching carriage 4, which moves in the switching housing 5 in translation. On the shift carriage 4 as Loskontaktträger the Loskontakte are mounted. In addition, the electrical contacts 6 are in the housing 5. The fixed contacts 6 can be designed as so-called blade contacts with two blades or blade surfaces per blade contact, as in FIG Fig. 6 shown. For each current phase L1, L2, L3, two pairs of these blade contacts are preferably provided in order to avoid a double interruption of the corresponding current phase L when turning off the power switch strip 1 to realize. When switching on the switching slide 4 is moved with the loose contacts in the direction of the blade contacts, so that the circuits are closed. Furthermore, there are 5 splitter stacks 18-i in the switch housing, as in Fig. 2 recognizable. At the in Fig. 1 . 2 illustrated embodiment, twelve splitter stack 18-1 to 18-12 are provided for a corresponding number of Loskontaktpaketen or Loskontakteinheiten 3-1 to 3-12, which are located in the shift carriage 4, as in Fig. 4 is shown. The splitter stack 18-i ensure that arcing LB arising under load are limited and deleted when switching off. As in Fig. 2 shown, the shift lever 15 is actuated within an operating unit 19, which is preferably designed tool-safe. The shift lever 15 can be sealed in a possible embodiment, both in the on state and in the off state. Fig. 2 also shows so-called tunnels 20-1, 20-2, 20-3, which are intended for assembly purposes. For example, clamping screws can be guided through the mounting tunnels 20-i. The tunnel 20-i thus serve for tool implementation. The tunnels 20-i may in one possible embodiment be covered with associated hinged lids. In addition to the access rails 16-1, 16-2, 16-3, the switching device 1 also has associated outgoing contact rails 21-1, 21-2, 21-3 for the corresponding current phases L1, L2, L3. The outlet rail contacts 21-i protrude in the assembled state of the load switch bar 1 preferably down from the housing 5 and can be used to connect electrical loads or electrical loads. At the in Fig. 1 In the illustrated embodiment, three NH fuses 14A, 14B, 14C are provided for three corresponding power circuits L1, L2, L3. In each circuit, the current phase Li is derived via an associated access rail 16-i from the current-carrying rail and passes through a Stromführungsbügel 6D a contact blade in the on state of the load-disconnector 1 on the on the Knife surfaces of the contact blade resting Loskontaktpaar 3A, 3B of a Loskontaktpaketes 3 to the opposite Stromführungsbügel 6C of the contact blade 6 and from there via a fuse contact and a NH fuse inserted therein 14A, 14B, 14C to the opposite fuse contact, which in turn via another switched-contact contact arrangement. 2 is electrically connected to a feeder contact 21-i. Thus, a current phase Li derived from a bus bar via an access rail 16-i is routed to a feeder contact rail 21-i via two closed contact assemblies 2, between which there is an inserted fuse 14A, 14B, 14C. When operating the operating handle or shift lever 15 down to turn off the circuit breaker 1 of this current path or circuit is then automatically interrupted by means of two switching contact arrangements 2 on both sides of the NH fuse used. The wear of the switching contact arrangement 2 is minimal due to the provided sacrificial switching contacts 3B. This in Fig. 1 illustrated switching device 1 is suitable for example for a current range of 100 to 700 amps and a voltage range of, for example, 400 to about 700 volts.

Fig. 3 shows a detail view of in Fig. 1 shown load switch 1 to illustrate the operation of the switch contact arrangement 2 of the invention. The housing 5 of the circuit breaker 1 may have ventilation slots, as in Fig. 1 . 2 shown. Furthermore, a ventilation duct can be provided below the NH fuse-links 14A, 14B, 14C. As a result, also resulting switching gases can be derived. This ventilation duct runs in the installed state in the vertical direction, so that due to a chimney effect, the possibly resulting switching gases are derived and the temperature is lowered within the housing 5.

The switching contact arrangement 2 according to the invention is suitable for any switching devices 1, in particular for circuit breakers, load switch strips or the like. The actuation of the switching contact arrangement 2 according to the invention can on the one hand be done manually by means of an operating lever by means of a switching slide 4 or motor driven by the movement of a Loskontaktträgers. In one possible embodiment of the switching contact arrangement 2 according to the invention, the loose contacts, in particular the switching sacrificial contacts 3B, are mounted interchangeably within the loose contact unit 3.

LIST OF REFERENCE NUMBERS

1

Switch disconnectors

2

Contact configuration

3

Loskontaktpaket

3A

Current carrying contact

3B

Switch sacrificial contact

4

Loskontakteinheit

5

casing

6

switching contact

7A, 7B

Contact edge

8A, 8B

contact point

9

Distanzblech

10

feather

11

roller cage

12

frame

13

Security Contact

14A, 14B, 14C

fuse

15

operating handle

16

access rail

17

Snap-action mechanism

18

Splitter assembly

19

operating unit

20

assembly-tunnel

21

leaving rail

Claims (14)

1. Electromechanical switching contact arrangement (2) having at least one release contact unit (3) that is arranged in a movable manner relative to a switching contact (6),
   wherein the release contact unit (3) comprises at least one current-conducting contact (3A) for conducting current after completing a switching procedure, said current-conducting contact being protected against wear during the switching procedure by means of a switching sacrificial contact (3B), wherein the release contact unit (3) is attached to a release contact carrier (4) that may move in a translational manner along a movement axis, wherein the fixed switching contact (6) comprises a contact flank that is configured in a blade-shaped manner, wherein the contact flank is a contact flank (7A, 7B) that extends at an oblique angle in relation to the movement axis, wherein the current-conducting contact (3A) and the switching sacrificial contact (3B) are arranged one behind the other in relation to the movement axis in a switched-off state of the switching contact arrangement (2), with the result that in the switched-off state the switching sacrificial contact (3B) is located between the contact flank (7A, 7B) and the current-conducting contact (3A), wherein the switching sacrificial contact (3B) and the current-conducting contact (3A) in this case are entirely separated from the contact flank (7A, 7B) of the switching contact (6), said contact flank being configured in a blade-shaped manner.
2. Switching contact arrangement according to claim 1,
   wherein the movable release contact carrier (4) is a switching slide that may move in a translational manner within a housing (5) relative to the at least one fixed switching contact (6), wherein the release contact carrier (4) that is provided in a movable manner in the housing (5) may be actuated manually in particular by means of a switching mechanism (17).
3. Switching contact arrangement according to any one of the preceding claims 1 to 2,
   wherein the switching sacrificial contact (3B) of the release contact unit (3) is a contact roller that is formed in a double conical manner and the current-conducting contact (3A) of the release contact unit (3) is a cylindrical or conically-formed contact roller or wherein a contact blade of the fixed switching contact (6) is configured in a conical manner or comprises different contacting planes and both the switching sacrificial contact (3B) as well as the current-conducting contact (3A) of the release contact unit (3) are configured in a cylindrical manner.
4. Switching contact arrangement according to claim 3,
   wherein the contact roller of the switching sacrificial contact (3B) is configured as longer than the contact roller of the current-conducting contact (3A).
5. Switching contact arrangement according to any one of the preceding claims 1 to 4,
   wherein in a switched-on state of the switching contact arrangement (2) the current-conducting contact (3A) and the switching sacrificial contact (3B) of the release contact unit (3) lie against a contact surface of the contact blade.
6. Switching contact arrangement according to any one of the preceding claims,
   wherein in the switched-off state of the switching contact arrangement (2) the current-conducting contact (3A) and the switching sacrificial contact (3B) of the release contact unit (3) lie separated from the contact surface of the contact blade, wherein the switching sacrificial contact (3B) of the release contact unit (3) is facing the contact flank (7A, 7B) of the contact blade, said contact flank extending at an oblique angle.
7. Switching contact arrangement according to any one of the preceding claims,
   wherein during a switching procedure from the switched-on state into a switched-off state of the switching contact arrangement (2) initially the current-conducting contact (3A) is separated from the contact blade of the electrical switching contact (6) and subsequently the switching sacrificial contact (3B) is separated from the contact blade of the fixed switching contact (6).
8. Switching contact arrangement according to any one of the preceding claims,
   wherein the contact flank (7A, 7B) that extends at an oblique angle in relation to the movement axis comprises a transistion point (8A, 8B), wherein when separating the switching sacrificial contact (3B) of the release contact unit (3) from the contact blade of the electrical switching contact (6) an arc forms at the transistion point (8A, 8B), said arc moving along the contact flank (7A, 7B) of the contact blade, said contact flank extending at an oblique angle, away from the release contact carrier (4) outwards to a quenching plate stack (18) .
9. Switching contact arrangement according to any one of the preceding claims,
   wherein the release contact unit (3) comprises two release contact pairs that are spaced from one another by means of one or multiple spacing sheets (9), said release contact pairs comprising respectively a current-conducting contact (3A) and a switching sacrificial contact (3B).
10. Switching contact arrangement according to claim 9,
    wherein the two release contact pairs of a release contact unit (3) are guided during a switching procedure over the two opposite-lying contact surfaces of the contact blade of the fixed switching contact (6),
    wherein two release contact units (3) are preferably provided on the release contact carrier (4), said release contact units respectively being configured from two release contact pairs that comprise respectively a current-conducting contact (3A) and a switching sacrificial contact (3B),
    wherein the two release contact units (3) are attached in a symmetrical manner on both sides to the release contact carrier (4) and during a switching procedure are guided over the opposite-lying contact surfaces of two accordingly symmetrically-arranged contact blades of an associated fixed switching contact (6).
11. Switching contact arrangement according to any one of the preceding claims,
    wherein the release contact unit (3) is mounted in the release contact carrier (4) in a resilient manner or wherein contact rollers are mounted in a resilient manner in the contact unit (3).
12. Load-break switch (1) having fuses that are constructed in a strip-shape, said load-break switch having at least one fuse (14A, 14B, 14C) that may be used and said fuse may be switched into a current path by means of at least one switching contact arrangement (2) according to any one of the preceding claims 1 to 11.
13. Load-break switch (1) having fuses that are constructed in a strip-shape, according to claim 12,
    wherein the fuse (14A, 14B, 14C) may be inserted into two opposite-lying fuse contacts (13) that are provided in a housing (5) of the load-break switch (1), wherein the two fuse contacts (13) are electrically connected respectively to an electrical switching contact (6) of a switching contact arrangement (2) according to any one of the preceding claims 1 to 12, said electrical switching contact being provided in the housing (15) of the load-break switch (1),
    wherein a movable switching slide (4) that may be actuated manually is preferably provided in the housing (5) of the load-break switch (1) as a release contact carrier that carries the release contact units (3) of the switching contact arrangements (2) and in the case of an actuation may move in a translational manner relative to the switching contacts (6) of the switching contact arrangements (2), said switching contacts being fixedly arranged in the housing (5), so as to close or separate the respective current path.
14. Circuit breaker having at least one switching contact arrangement (2) according to any one of the preceding claims 1 to 11.

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