DD142621A1 - BRIDGE CONTACT ARRANGEMENT FOR HAND SWITCH WITH ASYMMETRIC SWITCH OPENING - Google Patents

Abstract

The aim of the invention is to provide a contact arrangement, the advantages of low technological expenditure (production costs) and simple construction (material and volume saving) with that of the safe control of overload and Short-circuit currents connects. The peculiarity of the invention exists in the design of the switching system so that asymmetric Switching piece openings arise. This is a jumper for Double interruption so stored in a switch that after different switching paths, the contact points in succession open or close. As application area are hand-operated electrical switches with preferably smaller short-circuit currents, such as For example, fault current circuit breaker, motor protection switch, etc., intended. - Fig.1 -

Description

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Bridge contact arrangement for manual switch with asymmetrical switching piece opening

Field of application of the invention

The invention relates to a bridge contact arrangement in; hand-operated, electrical switching devices z »B * in circuit breakers»

Characteristic of the known technical solutions

It is known, in particular, to equip contactors and parcel cam switches with double-break contact systems, which have technological advantages due to the. Elimination of the flexible supply line to the moving contact piece to get. Disadvantages for the arc quenching, which manifest themselves iw a * in a reduction of the magnetic blast, are intentionally taken into account. CDB-AS 1 246 85-1)

On the other hand, known and for some versions of circuit breakers or »Handschalterη for safe control of arc quenching in a wide range of overload currents to short-circuit currents inevitable to apply the single-break contact arrangement with the already mentioned flexible supply line (DE-AS 1 185 703) *

The disadvantages of this arrangement include cost of materials, time-consuming prefabrication, and shelf life problems. "

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Perner bridge contact arrangements have become known, which have only a single interruption, in which therefore one of the contact points effective as a bearing point, (DE-AS 1 140 261, DE-AS 1 I70 Ö4I) · These arrangements; But are only suitable for auxiliary or ♦ control switch for small loads, while larger breaking currents, the risk of, welding of the joint consists.

It. is also already known to lift only a Abbrandstück a contact bridge at low speed, the arc extinguished at a favorable circuit already, and the second Abbrandstück purpose; Then lift off at a higher speed (DS-AS 1 244 274), this arrangement acts alternately Depending on the direction of actuation of the switch and is therefore also symmetrical.

Finally, it has also been proposed to arrange an arc chamber only on one side of a uniformly lifting double contact arrangement and to extinguish the strong currents by means of a blow coil, while on the other side only a permanent magnet generates a constant magnetic field.

Aim of the invention

The aim of the invention is to provide a contact arrangement for larger switching capacities, in which the; Closing and opening a functionally reliable electrical connection with little technological effort is possible »

Explanation of the essence of the invention

The technical problem is, by a special contact arrangement a Einfacliunterbrechung without flexible lead for larger switching performance to achieve ·

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The features of the invention are that a special shift drum with the movable contact piece carrier is introduced into a Festschalt piece system that creates a double-break contact arrangement with asymmetric contact piece opening · This is in the first phase of the scarf tbewegung only the smaller switching stroke having Zontaktstelle closed » The contact point with the * larger switching stroke follows in time nacfe »The activation thus corresponds to the conditions in the single break and is characterized by reduced bounce compared to the real double interruption. When the switch-off, the larger switching stroke, having contact point is first opened, wherein. a powerful magnetic field for the movement of the; Schaltliehtbogens arises ·

Then the opening of the ζγ / eiten contact point takes place, whereby a switching arc also forms at this point. By appropriate dimensioning it is achieved that the main arc (1 * opening point) is already in the arc quenching chamber. The preservation of; additional arc in the 2, opening point causes a desired for the turn-off instability, For its deletion no quenching chamber is required. This results in a real material and volume savings compared to a conventional double interruption,

Exemplary embodiment

Hereinafter, the invention Kontoctanordnung is explained in more detail using an exemplary embodiment ι

Pig, 1 shows the Kontalctanordnung in; switched off state »Both break points are open»

2 shows the contact arrangement in the Zwiohonstellung? in which · has opened a Ünterbrechungsstells and the other point of interruption still closed is.t ₀

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FIG. 3 shows the contact arrangement in the switched on state. Both break points are closed.

Fig. 4 shows a plan view of the Pig »3 with only one. Switching element.

For the sake of better clarity, the illustration of a housing was omitted in all representations and only the shift drum is shown as a detail in the sectional illustration.

The contact arrangement shows the Festschaltstückträger marked with 1 and 2 with the switching pieces 3 and »4 and the connection means 5 or» 6 »Between this Festschaltstückanordnung is the roller-shaped crossbar 7 with the jjedes for each switching element arranged in a chamber movable switching bridge 8, to the Ends each a switching piece 9 and 10 carries · The contacts assigned to the springs 11 and provide in the on state for the required contact forces and are used with a required bias.

The larger contact opening I3 is an arc extinguishing system; Assigned to the smaller contact opening I5, it is not necessary to assign a quenching chamber. By appropriate design or "arrangement of gas-emitting materials 16 favoring effects for arc quenching can be generated" The double interrupting contact arrangement with asymmetrical Schaltstück haii result in that The switch-off initially only a point of interruption with the contact opening I3 ¹ Fig. 2 is formed (Phase 1) and the forming switching arc as in classical simple interruption by strong magnetic blast from the contact opening I3 ¹ Fig »2 heraiaswandert to finally in the associated quenching chamber to be paused or extinguished. Subsequently, the zv / eite interruption point with the contact opening I5 Fig. 1 is formed (Phase 2).

Here, too, creates an arc - if still current flow available, d. H. the main arc has not yet extinguished and this remains in the contact opening 15 until the final deletion »In many cases, the emergence of the; Arcs in the contact hole "I" contribute to the occurrence of instabilities of the arc located in the quenching chamber H: thus assisting the final quenching · The persistence of the arc in the contact opening I can be governed by constructional means: and its repercussions on the Arc in the quenching chamber Η can be increased by arranging gas-emitting materials in the vicinity of the contact opening 5 5.

Claims (3)

-6- 211 766 Erfindungsanspruoh "U bridge contact arrangement for manual switch with asymmetric Schaltstüclcöffnung, characterized in that a switching bridge (8) carrying v / alzenförmige cross-bar (7) offset so arranged to the Pestschaltstückeen C.3» 4) that the opening or , Closing paths of the contact points C3 »9 * 4» " ¹ O) as at least: 2: 1 behavior, 2. »bridge contact arrangement according to item 1, characterized in that a plurality of switching bridges (8) are arranged on a switching crossmember (7), 3> bridge contact arrangement according to item 1, characterized in that only the contact point C3 * 9) with the larger opening path is associated with a quenching chamber (H). - For this 1 sheet drawings -