DE102017202370B4 - Arc quenching device, electromechanical protective switching device and manufacturing process - Google Patents

Abstract

Arc quenching device (10) for an electromechanical protective switching device (1),
- with an arcing chamber in which several arc splitters (22) are spaced apart from one another in a stacking direction (R) and arranged parallel to one another, with at least one of the arc splitters (22) having a smaller first plate thickness (d1) in a first area and a smaller first plate thickness (d1) in a second area Area has a reinforced second sheet thickness (d2), the arc splitters (22) having a v-shaped incision (23), characterized in that the reinforced second sheet thickness (d2) of the at least one arc splitter (22) around a root region of the v shaped incision (23), the at least one arc splitter (22) being designed as a stamped and bent part and the reinforced second sheet metal thickness (d2) being formed by bending over a sheet metal tab (24), the sheet metal tab (24) being at least is partially formed from the material of the V-shaped incision (23).

Description

The invention relates to an arc quenching device for an electromechanical protective switching device, which is preferably designed as a circuit breaker, a miniature circuit breaker or a fault current circuit breaker. The arc quenching device is designed to quench an arc that occurs when a switching contact of the protective switching device opens, and for this purpose has a quenching chamber in which several quenching plates are spaced apart from one another in a stacking direction and arranged parallel to one another. Furthermore, the invention relates to an electromechanical protective switching device for monitoring an electrical circuit, which has such an arc quenching device, and a method for producing the arc quenching plates required for the arc quenching device.

Various protective switching devices are known from the prior art. These include, for example, circuit breakers, miniature circuit breakers or residual current circuit breakers. They are used in particular as switching and safety elements in electrical power supply networks and serve to monitor and protect an electrical circuit. Circuit breakers are specially designed for high currents. A circuit breaker (so-called circuit breaker), which is also known as a "miniature circuit breaker" (MCB), represents a so-called overcurrent protection device in electrical installations and is used in particular in the area of low-voltage networks. Circuit breakers and miniature circuit breakers guarantee safe shutdown in the event of a short circuit and protect consumers and systems from overload. In this way, for example, electrical lines are protected from damage due to excessive heating as a result of an excessively high electric current.

A residual current circuit breaker is a protective device to protect against a dangerous residual current in an electrical system. Such a fault current, which is also referred to as differential current, occurs when a live part of the line has an electrical contact to earth. This is the case, for example, when a person touches a live part of an electrical installation: in this case, the current flows as a fault current through the person's body towards earth. To protect against such body currents, the fault current circuit breaker must quickly and safely disconnect all poles of the electrical system from the mains when such a fault current occurs. In general technical usage, instead of the term "residual current circuit breaker", the terms FI circuit breaker (short: FI switch), residual current circuit breaker (short: DI switch) or RCD (for "Residual Current Protective Device") are used equivalently.

To monitor or to protect the electrical circuit, the respective protective switching device is electrically conductively connected via two connection terminals to an electrical line of the circuit to be monitored in order to interrupt the electrical current in the respective line if necessary. The protective switching device has a switching contact with a stationary contact and a moving contact that is movable relative thereto. The moving contact can be actuated via a switching mechanism of the protective switching device, so that the switching contact can be opened and closed. In this way, when a predefined condition occurs, for example a short circuit or an electrical overload, the switching mechanism is activated and the switching contact is thus opened in order to interrupt the electrical line and thus separate the monitored circuit from the electrical line network. Such protective switching devices are also known as modular installation devices in the field of low-voltage technology.

If the switching contact is opened at a time when an electric current is flowing through the switching contact, an arc formed from ionized air is formed when the switching contact is opened between the fixed contact piece and the moving contact piece moving away from it. For deionization - and thus for extinguishing the arc - conventional protective switching devices have what is known as an arc extinguishing chamber - also known as a deionization chamber. This is arranged in the immediate vicinity of the switching contact and, for its part, has a plurality of splitter plates which are arranged parallel to one another and are spaced apart from one another. An electromechanical protective switching device with such an arc quenching chamber is known, for example, from the German patent application DE 10 2011 002 714 A1 known.

If the arc is driven into the quenching chamber, it splits into several partial arcs when it hits the quenching plates, which then burn electrically in series between the individual quenching plates. The multiple partial arcs that are electrically connected sequentially one behind the other lead to a higher arc voltage overall. Together with a cooling effect of the quenching plates, which extracts heat from the arc, this leads to the arc being extinguished as it progresses. In order to achieve good quenching behavior, the arc must therefore be driven away from the switching contact into the arc quenching chamber as quickly as possible and extinguished there.

It should also be noted that the longer the arc burns and is not extinguished, the greater the heat input into the protective switching device caused by the arc. It therefore also serves to protect the protective switching device and the components installed in it if the arc can be extinguished as quickly as possible.

It is the object of the present invention to provide an arc quenching device, an electromechanical protective switching device for monitoring an electrical circuit and a method for producing the arc quenching plates required for the arc quenching device, which are characterized by rapid and reliable quenching of an arc occurring when the switching contact of the protective switching device opens distinguish at the same time low manufacturing costs.

From the pamphlet DE 69 315 384 T2 an arc quenching device with an arc quenching chamber is known, in which several quenching plates are spaced apart from one another in a stacking direction and arranged parallel to one another, the quenching plates having a V-shaped incision and at least one of the quenching plates having a smaller first sheet thickness in a first area and a smaller first plate thickness in a second area has an increased second sheet thickness.

This object is achieved by the arc quenching device, the electromechanical protective switching device for monitoring an electrical circuit and the method for producing the arc quenching plates required for the arc quenching device according to the independent claims. Advantageous configurations are the subject matter of the dependent claims.

The arc quenching device according to the invention for an electromechanical protective switching device has an arcing chamber in which a plurality of arc splitters are spaced apart from one another in a stacking direction and are arranged parallel to one another. At least one of the quenching plates has a smaller first plate thickness in a first area and an increased second plate thickness in a second area. Furthermore, the arc splitters have a V-shaped incision, with the increased second sheet thickness of the at least one arc splitter being formed around a root area of the V-shaped incision. The at least one arc splitter is designed as a stamped and bent part, the increased second sheet thickness being formed by bending over a sheet metal tab of the stamped and bent part, the sheet metal tab being formed at least partially from the material of the v-shaped incision.

The quenching plates of an arc quenching device are usually made of steel and draw the arc into the center of the arcing chamber due to their magnetic effect and the special design of the contour facing the arc. If the arc hits the quenching plates, it splits into several individual arcs that are electrically connected in series with one another, as a result of which the resistance increases and the flow of current decreases, so that the arc is finally extinguished. Compared to the first sheet thickness present in the first region, the second area has an increased second sheet thickness, i.e. the sheet thickness of the relevant arc splitter is partially thicker. In this way, in the sections of the quenching plate where the arc mainly resides, the plate thickness is increased to such an extent that the quenching plate is not completely melted by the heat generated by the arc, while in those sections of the quenching plate where the arc is hardly or not at all and the material is accordingly not or hardly stressed, the sheet thickness is reduced accordingly. In this way, the efficiency of the use of materials is significantly improved, which has a positive effect on the material costs - and thus on the manufacturing costs.

The essentially V-shaped incision has turned out to be particularly advantageous in order to draw the arc between the arc splitters as quickly as possible. In this way, the quenching performance of the arc quenching device is significantly improved, and the energy input into the protective switching device associated with the formation of the arc is significantly reduced. The term "root area of the V-shaped incision" means the area around the apex of the V-shaped incision. Since the arc hits the quenching plate here first, the second area with the increased second plate thickness is formed there.

Because the reinforced second area—and thus the second sheet thickness—is formed by bending a sheet metal tab as part of the punching and bending processing of the quenching plate that is required anyway, an additional process step for attaching an additional sheet metal part to form the reinforced second area is unnecessary. In this way, the production costs for producing the arc splitter according to the invention are further reduced.

The V-shaped incision is usually created by a punching process. By using the material thereby cut out to form the reinforced second region, an efficient use of resources is made possible. The material costs, and thus the manufacturing costs of the arc splitter, are further reduced in this way.

In an advantageous development of the arc extinguishing device, the first sheet metal thickness is preferably 0.3 mm to 0.5 mm, and the second sheet metal thickness (d2) is preferably 0.6 mm to 1.0 mm.

A second sheet thickness of 0.6 mm to 1.0 mm has proven to be advantageous for the second area, which is more heavily stressed by the arc, so that the quenching sheet is not completely melted by the arc. A first sheet thickness of 0.3 mm to 0.5 mm has proven to be sufficient in the first area, which is subjected to less stress and which is used, for example, to hold the quenching plate or to guide the gas.

In a further advantageous development of the arc extinguishing device, the first area is formed by an edge area of the at least one arc quenching plate.

Since the arc is guided through the quenching plates into the center of the arcing chamber, the second area with the increased second plate thickness is arranged there, while the first area with the first plate thickness, which is reduced in comparison thereto, is arranged predominantly in the edge area of the quenching plate. This edge area mainly serves to fix the quenching plate in the arcing chamber and to positively influence the gas flow of the plasma that occurs when the arc is formed.

In a further advantageous development of the arc quenching device, the at least one arc quenching plate is formed from a larger first sheet metal part and a smaller second sheet metal part, which is firmly connected to the first sheet metal part in the second region.

In principle, it is also possible to realize the second area of the arc splitter by connecting a smaller second sheet metal part to a larger first sheet metal part. The larger first sheet metal part has the shape of a conventional arc splitter with the first sheet metal thickness, while the second sheet metal part only has the shape of the second region. By connecting the first sheet metal part to the second sheet metal part, the arc splitter then has the second sheet thickness overall in this connection area.

In a further advantageous development of the arc quenching device, the arc splitters are combined to form an arc splitter stack and are held at a distance from one another in the stacking direction by means of a holding device.

By combining the several arc splitters to form a stack of arc splitters, i.e. to form an assembly, the effort required to install the arc quenching device in the housing of the protective switching device is significantly reduced.

The electromechanical protective switching device according to the invention for monitoring an electrical circuit has an insulating housing, in which the components of the protective switching device are accommodated and held, and an arc quenching device of the type described above, the insulating housing having a preconfigured area which is designed to accommodate the arc quenching device.

With regard to the advantages of the electromechanical protective switching device according to the invention for monitoring an electrical circuit, which has such an arc quenching device, reference is made to the advantages of the arc quenching device described above.

1. a) Bereitstellen einer Platine zur Herstellung des Löschblechs,
2. b) Einschneiden der Platine zur Herstellung des v-förmigen Einschnitts, sowie
3. c) Umbiegen des eingeschnittenen Bereichs um 180°,

auf.The method according to the invention for producing an arc quenching plate for an arc extinguishing device of the type described above has the following steps:

1. a) providing a circuit board for producing the quenching plate,
2. b) cutting the board to produce the V-shaped incision, and
3. c) bending the cut area by 180°,

on.

The v-shaped incision is no longer produced by completely punching out this part of the arc splitter in a stamping process, but only the two legs of the v-shaped incision are cut into the circuit board. Although the two incisions are oriented towards one another, they do not touch in the root area of the v-shaped incision. The incised area remains connected to the original board by one or more webs and is then bent over in the area of the web(s) until it is oriented parallel to the board and lies flat on it, in order to form the partially reinforced second area .

The method according to the invention for producing an arc quenching plate for the arc quenching device according to the invention is therefore characterized by the simplicity and efficiency of its production: By the part of an arc splitter that would have to be cut out anyway as part of the stamping process to produce the V-shaped incision, to form the second area ver is used, the material costs can be kept low. Furthermore, bending over eliminates an additional manufacturing step for connecting an additional sheet to the original arc splitter. The novel quenching plate created in this way - and with it the arc quenching device as well as the electromechanical protective switching device - can be manufactured much more cost-effectively in this way.

• 1 und 2 schematische Darstellungen eines aus dem Stand der Technik vorbekannten Löschblechpaketes;
• 3 eine schematische Darstellung des erfindungsgemäßen elektromechanischen Schutzschaltgerätes;
• 4 bis 7 schematische Darstellungen des erfindungsgemäßen Löschblechpaketes in verschiedenen Ansichten;
• 8 und 9 schematische Darstellungen eines jeweils einzelnen Löschblechs in verschiedenen Bearbeitungsschritten.

Exemplary embodiments of the arc quenching device, the electromechanical protective switching device and the method for producing a splitter plate for the arc quenching device are explained in more detail below with reference to the attached figures. In the figures are:

• 1 and 2 schematic representations of a prior art from the prior art splitter stack;
• 3 a schematic representation of the electromechanical protective switching device according to the invention;
• 4 until 7 schematic representations of the splitter stack according to the invention in different views;
• 8th and 9 Schematic representations of an individual quenching plate in various processing steps.

In the various figures of the drawing, the same parts are always provided with the same reference numbers. The description applies to all drawing figures in which the corresponding part can also be seen.

In the 1 and 2 is a splitter stack 20 known from the prior art in a side view ( 1 ) as well as in a perspective view ( 2 ) shown schematically. The splitter stack 20 consists of a total of twelve individual splitters 22, which are arranged parallel to one another and spaced equidistantly from one another in a stacking direction R. The individual quenching plates 22 are made of sheet steel and have an essentially rectangular outline. The outline is cut in a V-shape on one of the two narrow sides, as a result of which a substantially V-shaped cut 23 is formed. On their long sides, the individual arc splitters 22 are held equidistant from one another in the stacking direction R by means of a holding device 21 .

The V-shaped incision 23 has proven to be particularly advantageous in order to prevent the arc 7 (see 3 ) as quickly as possible between the arc splitters 20 in order to split it up into several partial arcs and thus extinguish it.

• Das Schutzschaltgerät 1 weist einen Eingangsanschluss 3-1 sowie einen Ausgangsanschluss 3-2 auf, welche in einem Isolierstoffgehäuse 2 des Schutzschaltgerätes 1 aufgenommen und gehaltert sind. Der Eingangsanschluss 3-1 sowie der Ausgangsanschluss 3-2 sind zur Kontaktierung des Schutzschaltgerätes 1 mit einem elektrischen Stromkreis (nicht dargestellt) ausgebildet und weisen jeweils eine Klemmschraube 3-3 zum Klemmen der elektrischen Anschlussleiter (nicht dargestellt) des Stromkreis auf. Der Eingangsanschluss 3-1 ist über eine elektrische Spule 8 mit einem im Isolierstoffgehäuse 2 ortsfest angeordneten Festkontakt 4 elektrisch leitend verbunden. Der Festkontakt 4 bildet zusammen mit einem relativ dazu beweglich gelagerten Bewegkontakt 5 einen Schaltkontakt, welcher geöffnet und geschlossen werden kann, um den Stromfluss zwischen dem Eingangsanschluss 3-1 und dem Ausgangsanschluss 3-2 zu unterbrechen oder zu ermöglichen. Hierzu ist der Bewegkontakt 5 an einem im Isolierstoffgehäuse 2 beweglich gelagerten Bewegkontaktträger 6 befestigt. Der Bewegkontaktträger 6 wiederum ist mit dem Ausgangsanschluss 3-2 elektrisch leitend verbunden.

3 shows a schematic representation of the electromechanical protective switching device 1 according to the invention in a side view, with a housing cover of the protective switching device 1 being omitted in order to enable an insight into the structural design of the protective switching device 1 . Based on the representation of 3 the basic structure and the mode of operation of such a protective switching device 1 are described in more detail below:

• The protective switching device 1 has an input connection 3 - 1 and an output connection 3 - 2 , which are accommodated and held in an insulating material housing 2 of the protective switching device 1 . The input connection 3-1 and the output connection 3-2 are designed to contact the protective switching device 1 with an electrical circuit (not shown) and each have a clamping screw 3-3 for clamping the electrical connecting conductors (not shown) of the circuit. The input connection 3 - 1 is electrically conductively connected via an electric coil 8 to a stationary contact 4 arranged in a stationary manner in the insulating material housing 2 . The fixed contact 4 forms, together with a moving contact 5 movably mounted relative thereto, a switching contact which can be opened and closed in order to interrupt or enable the flow of current between the input connection 3-1 and the output connection 3-2. For this purpose, the moving contact 5 is fastened to a moving contact carrier 6 that is movably mounted in the insulating housing 2 . The moving contact carrier 6 in turn is electrically conductively connected to the output connection 3-2.

For manual actuation of the protective switching device 1 , this has an actuating element 9 on a front side of the insulating material housing 2 , which is in operative connection with the moving contact carrier 6 . In this way, the switching contact can be opened and closed manually using the actuating element 9 .

When a short circuit occurs, the high short-circuit current flows through the coil 8 . This high short-circuit current is used to open the switching contact by drawing a plunger (not shown) that is movably mounted in the coil 8 into the coil 8 due to the magnetic effect of the coil current. The coil 8, which is stationarily mounted in the insulating material housing 2, together with the movably mounted plunger, forms a so-called electromechanical trigger. When triggered, the movement takes effect of the plunger onto the moving contact carrier 6, as a result of which the moving contact 5 is moved away from the fixed contact 4.

When the current-carrying switching contact is opened, an arc 7 is created, which initially burns between the fixed contact 4 and the moving contact 5 . If the moving contact 5 is moved away from the fixed contact 4, the arc voltage, which increases with the length of the arc 7, causes the arc 7 to commutate from the moving contact 5 to a guide rail 15, which is arranged below the switching contact that opens. The guide rail 15 is part of an arc extinguishing device 10. One end of the guide rail 15 is guided to the lower end of an arc splitter stack 20; the other end of the guide rail 15 is electrically connected to the output terminal 3-2.

The arc quenching device 10 also has an arc splitter stack 20 which consists of a plurality of arc splitters 22 arranged parallel to one another. The quenching plates 22 are arranged parallel to one another and are held at a distance from one another in a stacking direction R by means of a holding device 21 . An upper end of the arc quenching device 10 is electrically conductively connected to the fixed contact 4 .

The electromagnetic forces occurring as a result of the high short-circuit current interact with the arc 7 in such a way that it is moved away from the switching contact that is opening. The arc 7 is first driven in the direction of what is known as an antechamber region 16 which is located below the switching contact in front of the arc extinguishing device 10 . In the further course, the arc 7 is finally forced into the splitter stack 20 of the arc extinguishing device 10 . The arc 7 strikes the quenching plates 22, as a result of which it breaks down into a corresponding plurality of partial arcs which are electrically connected in series. Because of the resulting higher arc voltage, the arc 7 finally breaks off and goes out.

In the 4 until 7 the splitter stack 20 of the arc extinguishing device 10 according to the invention is shown schematically in different views. The splitter stack 20 in turn consists of twelve individual splitters 22 which are arranged parallel to one another and are held equidistant from one another in the stacking direction R. The quenching plates 22 each have an essentially rectangular outline, which is incised in a V-shape on one of the two narrow sides, as a result of which an essentially V-shaped incision 23 is formed. On their long sides, the individual splitters 22 are held equidistant from one another in the stacking direction R by means of a holding device 21, as a result of which the splitter stack 20 is formed as a preassembled assembly.

Each of the quenching plates 22 consists of a larger first sheet metal part 22-1 and a smaller second sheet metal part 22-2. The two sheet metal parts 22 - 1 and 22 - 2 lie flat on top of each other and are firmly connected to one another, with the second sheet metal part 22 - 2 being arranged in the root region of the V-shaped incision 23 . In this way, a first area is formed in which only the larger first sheet metal part 22-1 is present, and a smaller second area in which both sheet metal parts 22-1 and 22-2 are present. Accordingly, the arc splitter 22 has a first sheet thickness d1 in the first region, which corresponds to the sheet thickness of the first sheet metal part 22-1. In the second area, the arc splitter 22 has a greater second sheet thickness d2, which essentially corresponds to the sum of the sheet thicknesses of the first sheet metal part 22-1 and the second sheet metal part 22-2.

The first sheet metal thickness d1 is thus reinforced in the root area of the V-shaped incision 23 by the sheet metal thickness of the second sheet metal part 22-2, so that the second sheet metal thickness d2 results there. This has the advantage that the quenching plates 20 have the greater second plate thickness d2 in the second region in which the arc 7 enters the arcing chamber 20 and which is therefore subjected to significantly greater stress. The first area, which represents an edge area of the respective quenching plate 22 and is presently arranged in a U-shape around the second area, is in contrast stressed significantly less and therefore has the smaller first plate thickness d1. Thus, the material of the respective arc splitter 22 is dimensioned so thick where there is an increased thermal load from the arc 7 that it is not completely melted by the arc 7 . At the other points of the arc splitter 22, where the arc 7 stays only briefly or not at all and the material is therefore exposed to a significantly lower stress, the arc splitter 22 therefore has the smaller first sheet thickness d1. In this way, less material can be used for the quenching plates 22 .

That in the 4 until 7 The splitter stack 20 shown has a total of twelve individual splitters 22 . However, the arc extinguishing device 10 according to the invention is not limited to this embodiment. It is also possible to design an arc splitter stack with a number of arc splitters 22 that differs from twelve and to arrange it in the insulating housing 2 of the protective switching device 1 .

Ideally, the shape of the arc splitters 22 is designed in such a way that the second sheet metal part 22 - 2 is formed at least partially from the material that accumulates as waste anyway when the V-shaped incision 23 is punched out.

1. a) Bereitstellen einer Platine zur Herstellung des Löschblechs 22,
2. b) Einschneiden der Platine zur Herstellung des v-förmigen Einschnitts 23, und
3. c) Umbiegen des eingeschnittenen Bereichs um 180°

auf. Der v-förmige Einschnitt 23 wird also nicht dadurch gebildet, dass der betreffende Bereich vollständig ausgestanzt wird. Vielmehr werden die Konturen des v-förmigen Einschnitts 23 nur eingeschnitten, derart, dass die beiden aufeinander zulaufenden Schnitte 25 einander nicht berühren, so dass eine Blechlasche 24 gebildet ist. Das Löschblech 22 weist in einem mittleren Bereich eine langlochförmige Öffnung 26 auf, welche nach Abschluss der Bearbeitung den Wurzelbereich des v-förmigen Einschnitts 23 bildet. Aufgrund dieser Öffnung 26 entstehen beim Erstellen der beiden Schnitte 25 zwei Stege 27, über die die Blechlasche 24 stoffschlüssig mit dem restlichen Löschblech 22 verbunden bleibt.Based on 8th and 9 , which each show schematic representations of an individual arc splitter 22 in various processing steps, the method according to the invention for producing an arc splitter 22 is explained in more detail below. This shows the steps:

1. a) providing a circuit board for producing the arc splitter 22,
2. b) cutting the blank to produce the V-shaped cut 23, and
3. c) Bending the incised area 180°

on. The V-shaped incision 23 is therefore not formed by completely punching out the relevant area. Rather, the contours of the V-shaped incision 23 are only cut in such a way that the two incisions 25 running towards one another do not touch one another, so that a sheet metal tab 24 is formed. The quenching plate 22 has a slot-shaped opening 26 in a central area, which forms the root area of the V-shaped incision 23 after the machining has been completed. As a result of this opening 26, two webs 27 are created when the two cuts 25 are made, via which the metal tab 24 remains cohesively connected to the rest of the arc splitter 22.

The sheet metal tab 24, which has the function of the smaller second sheet metal part 22-2, is then bent through 180° so that it comes to lie flat on the larger first sheet metal part 22-1 of the splitter plate 22. By bending the sheet metal tab 24, an additional processing step for connecting the two sheet metal parts 22-1 and 22-2 is not necessary.

The two 8th and 9 differ only in the basic shape of the quenching plate 22 before the stamping and bending process: while the sheet metal tab 24 in the in 8th shown example flush with the essentially rectangular arc splitter 22 is in the in 9 illustrated case, an extended sheet metal tab 24 is shown, the distal end of which protrudes beyond the relevant end of the arc splitter 22. In this way, the second area, which is characterized by the increased second sheet thickness d2, can be enlarged somewhat in the direction of the narrow side facing away from the incision 23.

Reference List

1

protective switching device

2

insulating housing

2

insulating housing

3-1

input port

3-2

output port

3-3

clamping screw

4

fixed contact

5

moving contact

6

moving contact carrier

7

Electric arc

8th

Kitchen sink

9

actuator

10

arc extinguishing device

15

guardrail

16

antechamber area

20

splitter stack

21

holding device

22

quenching plate

22-1

first sheet metal part

22-2

second sheet metal part

23

incision

24

sheet metal tab

25

cut

26

opening

d1

first sheet thickness

d2

second sheet thickness

R

stacking direction

Claims (7)

Arc quenching device (10) for an electromechanical protective switching device (1), - with an arcing chamber in which a plurality of arc splitters (22) are spaced apart from one another in a stacking direction (R) and arranged parallel to one another, with at least one of the arc splitters (22) being in a first region has a smaller first sheet thickness (d1), and in a second area an increased second sheet thickness (d2), the arc splitters (22) having a V-shaped incision (23), characterized in that the increased second sheet thickness (d2) of the at least one quenching plate (22) is formed around a root region of the V-shaped incision (23), the at least one quenching plate (22) being a stamped Bie ge part is formed and the reinforced second sheet metal thickness (d2) is formed by bending over a sheet metal tab (24), the sheet metal tab (24) being formed at least partially from the material of the v-shaped incision (23). Arc extinguishing device (10) after claim 1 , characterized in that the first sheet thickness (d1) is 0.3mm to 0.5mm, and that the second sheet thickness (d2) is 0.6mm to 1.0mm. . Arc quenching device (10) according to one of the preceding claims, characterized in that the first area is formed by an edge area of the at least one arc splitter (22). . Arc quenching device (10) according to one of the preceding claims, characterized in that the at least one quenching plate (22) consists of a larger first sheet metal part (22-1) and a smaller second sheet metal part (22-2), which in the second area is fixed to the first Sheet metal part (22-1) is connected, is formed. . Arc quenching device (10) according to one of the preceding claims, characterized in that the splitters (22) are combined to form a splitter stack (20) and are held at a distance from one another in the stacking direction (R) by means of a holding device (21). Electromechanical protective switching device (1) for monitoring an electrical circuit, - with an insulating housing (2) in which the components of the protective switching device (1) are accommodated and held, and - with an arc extinguishing device (10) according to one of Claims 1 until 5 , characterized in that the insulating housing (2) has a preconfigured area which is designed to accommodate the arc extinguishing device (10). Method for producing an arc splitter (22) according to one of Claims 1 until 5 , with the steps: a) providing a blank for producing the arc splitter (22), b) cutting the blank to produce the V-shaped incision (23), c) bending the cut area by 180°.

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