DE1046748B - Device for arc extinguishing on small electrical circuit breakers with push button actuation - Google Patents

Description

The small circuit breaker should achieve the highest possible breaking capacity without the at the Contact separation resulting arcs endanger its internal components or the function is disadvantageous influenced.

As is known, the aim is to keep the dimensions of the small circuit breaker as small as possible to hold and still a rapid extinguishing of the arc through the highest possible stopping speed, Achieve cooling and magnetic blowing.

In the known constructions, the greatest possible switching speed, blowing effect and Cooling achieved, which can hardly be increased. In order to control the arc, at the known small self-switches in the switching chamber ribs or projections attached to the Insulating material or metal. Their purpose is to split the arc to get a high one

To achieve arc resistance. Additional metal parts are arranged in the switching chamber, to cool and deflect the arc. The arc that occurs when the contact is opened has the endeavor to spread through the resulting pressure beyond the switching chamber and into to penetrate the further switch room.

In the known small circuit breakers, there is usually a connection between the switching chamber and the switching mechanism a cover made of insulating material is arranged. There are one or two openings in this for the movably arranged contact carrier. Through this the arc or the Switching lights can penetrate unhindered and have a disruptive effect in the event of a short-circuit shutdown. Around To mitigate the effects, designs have become known in which small in the switching chamber Slots are provided through which the arc is to be cooled before it enters the remaining ones Switch room can enter.

There are also small circuit breakers in which the breakthroughs do not have a seal for the contact-bearing Switching element are made relatively large. By means of a with small holes Plate these are covered, whereby a cooling of the arc is achieved when passing through shall be. Switching chambers have also become known which are provided with so-called trapping chambers which absorb the amount of oxygen-containing air displaced in the short-circuit circuit and should only be released again when the arc has been extinguished. There are also versions with ferromagnetic sheets arranged on both sides of the contact point, which create the arc should hinder its effects by dividing them up.

Arc extinguishing device

on small electrical circuit breakers

with push button actuation

Applicant:

VEB electrical installation Annaberg,

Annaberg-Buchholz 1 (Erzgeb.),

Work Street 5

Siegfried Kleditzsch, Mauersberg via Marienberg (Sa.), has been named as the inventor

Extensive tests have shown that the known measures for small circuit breakers for the highest breaking capacity still not enough to break the arc with the small one for the switching chamber available space so suddenly weaken that the short-circuit protection is guaranteed.

The smaller the switching chamber or the switch volume is, the greater the internal pressure created at the moment of switch-off, through which the Small self-switch can be claimed to be unusable. There is also a risk that the switching light can come out through the guidance of the switch-on pushbutton and the operator endangered. Therefore, it is ensured that the arc from the beginning until it is extinguished is so controlled that it can only develop to a limited extent and is erased in a very short time.

According to the invention, the object is achieved in that above the switching chamber a mechanically controlled Slide is connected to the movable contact carrier so that it opens when the contacts the switching chamber closes off from the remaining switch room during the switch-off process. Therefore, the high temperature of the arc resp. Gases produced by switching fire are retained, which have a quenching effect on the arc. It is advantageous here to use two guide plates, which are opposite one another in a known manner, on one side Switching chamber center, to be arranged on the side facing away from the bimetal inside the switching chamber.

809 699/441

Due to the one-sided arrangement of the baffles, the arc is only moved in the direction of the moving one Contact is distracted and does not come into contact with parts that are on the opposite potential Link. Due to the appropriate arrangement of the Leitbledhe, the cooling takes place at the same time of the arc.

Another feature of the invention is a sealing plate, preferably made of insulating material, which slidingly encloses the switch-on pushbutton and on the upper edges of the two side plates the switching mechanism rests and through the upper labyrinthine inner wall of the Switch housing is kept movable.

The pressure generated in the switch housing during shutdown presses the sealing plate to the upper labyrinth-shaped inner wall of the switch housing, so that the rest of the switching light cannot step outside. Due to the features listed, the safety of the miniature circuit breakers is increased significantly increased.

In the figures, an embodiment of the invention is shown, namely shows

Fig. 1 the switch partially in section through the housing in the off position;

Fig. 2 shows the switch partially in section through the housing in the on position;

Fig. 3 shows a view of the switching chamber with fixed and movable contact and the two Baffles;

Figs. 4 and 5 show a plan view of the sliding plate with the one shown in section two-armed contact carrier, with the switch in the on position in Fig. 4 and in the off position in Fig. 5 is located;

Fig. 6 shows a top view of the switch-on pushbutton with sealing plate and the two Side plates for the switching mechanism.

The openings provided for the contact carrier 1 2 and 2 '(Fig. 4) in the covers 3 and 4 made of insulating material are during the Switching operation covered with the slide 5 movably arranged on the contact carrier 1, which thus the Switching chamber closes off from the remaining switch room during the shutdown process. Of the Slide 5 is between the two covers 3 and 4 (Fig. 1) made of insulating material during the switching process is mechanically controlled by the contact carrier 1.

The end positions of the slide 5 can be seen from Figs. 1, 2, 4 and 5. The ones shown in Fig. 3 Guide plates 6 and 6 'are in the switching chamber 7 (Fig. 1 to 3) on hub-shaped projections 8 and 8 '(Fig. 3) engaged. When the arc hits the ferromagnetic Material, e.g. B. iron, manufactured baffles 6 and 6 ', the arcs are strongly cooled and through their one-sided arrangement in the direction of the movable contact 9 (Fig. 3) deflected so that they do not come into contact with parts on opposite potentials.

In spite of these measures, it can happen with a high breaking capacity that this is below a high Pressurized, strongly weakened switching lights partly in the space of the switching mechanism 10 (Fig. 1) can get. Around an exit of the rest of the switchfire in the vicinity of the stop push button (Fig. 1), a sealing plate 12, preferably made of insulating material, is attached, which slidingly encloses the switch-on pushbutton 11 and on the upper edges of the two side plates 13 and 13 'of the switching mechanism rests and through the upper labyrinth-shaped inner wall of the switch housing 14 (Fig. 1) is kept moveable.

Claims (4)

Patent claims: 1. Device for extinguishing arcs on small electrical circuit breakers with push-button actuation, characterized in that above the switching chamber (7) a mechanically controlled Slide (5) is connected to the movable contact carrier (1) in such a way that it opens when it is opened of the contacts the switching chamber (7) from the remaining switch room during the switch-off process concludes. 2. Device according to claim 1, characterized in that two in a known manner opposite guide plates (6 and 6 ') on one side to the middle of the switching chamber on the bimetal (15) remote side are arranged. 3. Device according to claim 1 and 2, characterized in that one preferably made of insulating material manufactured sealing plate (12) sliding the switch-on pushbutton (11) on the lower part encloses and on the upper edges of the two side plates (13 and 13 ') for the switching mechanism rests and through the upper labyrinth-shaped inner wall of the switch housing (14) is kept movable. 4. Device according to claim 1, characterized in that the mechanically controlled Slider (5) can be moved easily between two covers (3 and 4) made of insulating material and is guided in a straight line. 1 sheet of drawings © ■ 809 699/441 12.58