DE102018208074B4 - earth leakage circuit breaker - Google Patents

Abstract

Residual current circuit breaker (FI) for a low-voltage circuit having at least two conductors (L1, L2, L3, N), having:- a summation current transformer (W1) with a core, the primary side of which is formed by the conductors (L1, L2, L3, N) and the secondary side of which is formed by a secondary winding (SW1) wound onto the core, - a magnetic release (5) with an armature (2), a permanent magnet (4), a yoke with a first leg (6) and a second leg (7) , wherein the second leg (7) has an exciter winding (EW) which is connected to the secondary winding (SW1), characterized in that the exciter winding (EW) is embodied by conductor tracks (210) of a printed circuit board (200).

Description

The invention relates to a residual current circuit breaker for a low-voltage circuit according to the preamble of patent claim 1.

Residual current circuit breakers for electrical circuits, in particular for low-voltage circuits or systems, are well known. Residual current circuit breakers are also referred to as residual current circuit breakers or residual current devices, RCD for short.

Low voltage means voltages up to 1000 volts AC and/or 1500 volts DC. Low voltage means, in particular, voltages that are greater than extra-low voltage, with values of 25 volts or 50 volts AC and 60 volts or 120 volts DC.

Circuits, especially for low voltage, mean circuits for currents up to 6300 amps, more specifically currents up to 1600 amps, 1200 amps, 630 amps, 125 amps, 80 amps, 63 amps, 40 amps, 25 amps or 16 amps. The current values mentioned refer in particular to nominal and/or cut-off currents, i.e. the maximum current that is normally carried through the circuit or at which the electrical circuit is usually interrupted, for example by a protective device such as a miniature circuit breaker or circuit breaker. Residual current circuit breakers are used in particular for rated current ranges of or up to 16, 25, 40, 63, 80 or 125 amperes.

Residual current circuit breakers determine the total current in an electrical circuit, which is normally zero, and interrupt the electrical circuit if a residual current value is exceeded, i.e. a total current that is not equal to zero and exceeds a specific (differential) current value or residual current value.

Almost all previous residual current circuit breakers have a summation current transformer whose primary winding is formed by the conductors of the circuit and whose secondary winding delivers the total current, which is used directly or indirectly to interrupt the electrical circuit.

For this purpose, two or more conductors, mostly outgoing and return conductors or outer and neutral conductors in a single-phase AC network, all three outer conductors or all three outer conductors and the neutral conductor in a three-phase AC network, are connected by a core usually made of ferromagnetic material, led current transformer. Only the residual current, i.e. a current deviating from the outward and return current, from the conductors is converted. Normally, i.e. in a fault-free or fault-free state, the total current in an electrical circuit is zero. In this way, fault currents can be detected.

If, for example, a current flows to earth on the energy sink side or consumer side, this is referred to as a residual current. A fault occurs, for example, when there is an electrical connection from a phase conductor of the electrical circuit to ground. For example, when a person touches the phase conductor. Then a part of the electrical current does not flow back via the neutral conductor or zero conductor as usual, but via the person and the earth. This residual current can now be detected with the help of the summation current transformer, since the sum of the current flowing in and flowing back is not equal to zero. A relay or a holding magnet trigger, for example with a connected mechanism, causes the circuit to be interrupted, for example at least one, part or all of the lines. Residual current circuit breakers for detecting AC residual currents are generally known from the publication DE 44 32 643 A1 known.

The main function of residual current circuit breakers is to protect people from electrical currents (electric shock), as well as systems, machines or buildings from fire caused by electrical insulation faults.

If the residual current circuit breaker or its summation current transformer is designed in such a way that the energy on the secondary side is sufficient to actuate a tripping unit or an interruption unit or a trigger, then such residual current circuit breakers are called mains voltage-independent; otherwise depending on the mains voltage.

Residual current circuit breakers are generally designed to be independent of the mains voltage.

If a power pack is provided for the power supply of a residual current detection system, it is a mains voltage-dependent residual current circuit breaker. These are required, for example, to detect residual currents in DC voltage networks and mixed DC/AC networks or in circuits with high frequencies.

A residual current circuit breaker essentially consists of the functional groups summation current transformer, tripping circuit, holding magnet release or magnetic release, mechanics and Contacts. Furthermore, a test circuit with test button and test resistor is usually provided. The functionality of the residual current circuit breaker or the residual current protective device can be checked using the test button.

There are different types of residual current circuit breakers, which are designated by letters or letter combinations, such as AC, A, F, G, K, S, B, B+. Each type captures a specific type of fault current. Residual current circuit breakers with 2 poles for phase and neutral conductors (L+N), 3 poles for three phase conductors (L1, L2, L3) and 4 poles for three phase conductors and neutral conductors (L1, L2, L3, N) are currently known.

For example, type AC only detect purely sinusoidal fault currents. Type A detects both purely sinusoidal alternating currents and pulsating direct residual currents. Type F are mixed-frequency sensitive residual current protective devices. They record all types of fault currents, such as type A. They are also suitable for detecting fault currents that consist of a mixture of frequencies up to 1 kHz. Type K includes the characteristics of type A, but there is a short delay in its switch-off behavior. Type S are selective residual current circuit breakers, which can be graded in terms of the rated residual current and the tripping time.

Type B residual current protective devices are used not only to detect type F residual current types, but also to detect smooth DC residual currents. They are also suitable for residual currents with frequencies up to 2 kHz.

The same conditions apply to type B+ residual current protective devices as to type B residual current protective devices. Only the frequency range for detecting residual currents applies to an extended range of up to 20 kHz. The triggering takes place within this frequency range below 420 mA.

the DE 44 32 643 A1 discloses a contact arrangement for a residual current circuit breaker. When creating a test circuit 7; 8 for a residual current circuit breaker, care must be taken to ensure that the summation current transformer 3 is not bridged. If, in order to avoid current interruptions during the testing process, a bypass 9 is simply connected via the input and output terminals of an RCD, the converter 3 would not respond in the event of a residual current. In order to still be able to use a bypass 9 as an additional device 11, you have to tap the secondary winding of the summation current transformer 3 at its ends with 13; 14, one 13 of which is connected to the neutral conductor N and the other 14 via the test button 10 and the test resistor 12 to the phase L of the power supply. It no longer matters that the converter 3 was bypassed by the bypass contacts 9 .

the DE 10 2008 005 815 A1 discloses an electrical switching device with a micro-relay assembly. The invention relates to an electrical switching device, in particular a line circuit breaker, residual current circuit breaker, motor circuit breaker and the like, with a current path guided in an insulating housing between an incoming and outgoing terminal. A switching device according to the invention has a microrelay arrangement which comprises at least one contact point formed by a movable and at least one fixed contact piece and a microrelay drive which interacts with the movable contact piece. When a definable switch-off condition is detected, the micro-relay drive acts on the movable contact piece in an automatically opening manner.

The object of the present invention is to improve a residual current circuit breaker of the type mentioned at the outset, in particular to achieve a compact structure and to simplify production.

This problem is solved by a residual current circuit breaker having the features of patent claim 1 .

• - mindestens zwei Leiter eines zu schützenden Niederspannungsstromkreises,
• - einen Summenstromwandler mit einem Kern, dessen Primärseite durch die Leiter gebildet ist und dessen Sekundärseite durch eine auf den Kern gewickelte Sekundärwicklung gebildet ist,
• - einen Magnetauslöser mit einem Anker, einen Dauermagneten, einem Joch mit einem ersten Schenkel und einem zweiten Schenkel, wobei der zweite Schenkel eine Erregerwicklung aufweist, die mit der Sekundärwicklung verbunden ist.

According to the invention, a residual current circuit breaker, which also includes a module for a residual current function, is provided for a low-voltage circuit having at least two conductors, having:

• - at least two conductors of a low-voltage circuit to be protected,
• - a summation current transformer with a core, the primary side of which is formed by the conductors and the secondary side of which is formed by a secondary winding wound on the core,
• - A magnetic trip device with an armature, a permanent magnet, a yoke with a first leg and a second leg, the second leg having an excitation winding which is connected to the secondary winding.

According to the invention, the excitation winding is implemented as conductor tracks on a printed circuit board.

This has the particular advantage that the leg does not have to be wound with an excitation winding. According to the invention, this is realized by a winding realized as conductor tracks of a printed circuit board. Thus, a compact structure and a better or simpler production can be realized, since there is no need for time-consuming winding of the magnetic release. Since the holding magnet assembly is combined with the printed circuit board assembly, the usual connecting cables in the form of stranded wires are no longer required. This also results in higher reliability, since total failure due to wire breakage can be avoided.

In one configuration, the first leg can also have the excitation winding, so that both legs have the excitation winding (and not just one of the two legs). In this case, it is important that the direction of the magnetic flux is maintained through the correct winding direction.

Advantageous refinements of the invention are specified in the dependent claims.

In an advantageous embodiment of the invention, an interruption unit is provided for interrupting at least one conductor of the low-voltage circuit.

This has the particular advantage that the residual current circuit breaker includes a complete switching function, which means that a compact device can be implemented.

In an advantageous embodiment of the invention, a switching mechanism is provided which is connected on the one hand to the armature and on the other hand to the interruption unit. This has the particular advantage that the interruption is supported or reinforced by a switching mechanism.

In an advantageous embodiment of the invention, the armature is held in tension by a spring.

This has the particular advantage that even the smallest fault currents can be detected, in particular that a half-wave of a fault current is sufficient to cause an interruption.

Furthermore, a spring element can be provided between the armature and the switching mechanism, which ensures that the armature is correctly repositioned on the magnet system after it has been triggered.

In an advantageous embodiment of the invention, the circuit board is a multi-layer circuit board and the field winding is formed by several layers of conductor tracks. This has the particular advantage that a high number of turns can be achieved.

In an advantageous embodiment of the invention, the field winding is formed in particular by the inner layers of the conductor tracks of the multi-layer circuit board.

This has the particular advantage that the field winding is shielded from the outside and the upper layer can be used for the assembly of electronic components, in particular for an electronic trigger circuit, e.g. a storage circuit.

In an advantageous embodiment of the invention, the printed circuit board at least partially encloses at least one leg.

This has the particular advantage that a simple assembly of the magnetic release and circuit board is possible, since threading in particular is no longer necessary.

In an advantageous embodiment of the invention, the magnetic release is designed as a planar core transformer, i.e. a flat core transformer.

This has the particular advantage that a particularly compact design results. The magnetic circuit can be fully integrated into the printed circuit board.

In an advantageous embodiment of the invention, the circuit board contains electronic components, in particular at least one diode.

This has the particular advantage that electronic components of the residual current circuit breaker can be accommodated or integrated directly on the printed circuit board, as a result of which a compact and simple design can be achieved. In particular, a diode as a protective circuit can be advantageously integrated.

In an advantageous embodiment of the invention, the circuit board contains heating elements, such as heating resistors.

This has the particular advantage that special versions of fault circuit breakers can be easily implemented, in particular so-called SIGRESS versions, in which the holding magnet is heated, can be implemented so easily. In general, residual current circuit breakers can be easily implemented in this way, especially for low temperature ranges.

In an advantageous embodiment of the invention, the circuit board has at least some of the components of an electronic tripping circuit.

This has the particular advantage that a compact and simple design can be achieved.

All of the configurations, both in a dependent form related back to patent claim 1 and also based solely on individual features or feature combinations of patent claims, bring about an improvement in a residual current circuit breaker, in particular in order to achieve a compact design and simple manufacture.

The characteristics, features and advantages of this invention described and the manner in which they are achieved will become clearer and more clearly understood in connection with the following description of the exemplary embodiments, which are explained in more detail in connection with the drawing.

• 1 eine Prinzip-Darstellung eines Fehlerstromschutzschalters,
• 2 eine Darstellung eines Magnetauslösers,
• 3 eine Darstellung eines Planar-Core-Aufbaus,
• 4 eine Darstellung eines Magnetauslösers mit Leiterplatte.

The drawing shows:

• 1 a schematic representation of a residual current circuit breaker,
• 2 a representation of a magnetic trigger,
• 3 a representation of a planar core structure,
• 4 a representation of a magnetic release with circuit board.

• - mehrere Eingangsanschlüsse X1, X3, X5, NE, für den energiequellenseitigen Anschluss des Fehlerstromschutzschalters an eine Energiequelle, beispielsweise einen Niederspannungsstromkreis bzw. ein Niederspannungsnetz;
• - mehrere Ausgangsanschlüsse X2, X4, X6, NA für den energiesenkenseitigen Anschluss des Fehlerstromschutzschalters an eine Energiesenke, beispielsweise einen Verbraucher;
• - mehrere Leiter L1, L2, L3, N eines zu schützenden Niederspannungsstromkreises, wobei ein erster Leiter L1 zwischen erstem Eingangsanschluss X1 und ersten Ausgangsanschluss X2 geschaltet ist, dito ein zweiter Leiter L2 zwischen zweitem Eingangsanschluss X3 und zweitem Ausgangsanschluss X4, ein dritter Leiter L3 zwischen drittem Eingangsanschluss X5 und drittem Ausgangsanschluss X6 geschaltet ist, ein vierter Leiter N, z.B. Neutralleiter, zwischen vierten Eingangsanschluss NE und vierten Ausgangsanschluss NA geschaltet ist;
• - wobei z.B. die ersten bis dritten Leiter L1, L2, L3 Phasenleiter und der vierte Leiter N ein Neutralleiter bzw. Nullleiter eines beispielsweise Dreiphasenwechselstromkreises sind;
• - mehrere, z.B. erste bis vierte Kontakte K1, K2, K3, KN, die eine Unterbrechungseinheit K bilden, mit denen die ersten bis vierten Leiter L1, L2, L3, N elektrisch geöffnet oder geschlossen werden können, wobei ein Kontakt einem Leiter zugeordnet ist;
• - eine mit den Kontakten K1, K2, K3, KN verbundene Schaltmechanik bzw. Mechanik M, zum Öffnen und Schließen der Kontakte K1, K2, K3, KN;
• - einen mit der Mechanik M verbundenen Magnetauslöser bzw. Haltemagnet-Auslöser 5, der im Wesentlichen eine Öffnung der Kontakte K1, K2, K3, KN bewirkt;
• - einen ersten Summenstromwandler Wl, dessen Primärseite durch die Leiter L1, L2, L3, N gebildet ist, wobei die Leiter durch den Summenstromwandler W1 hindurchgeführt sind, der Summenstromwandler beispielsweise als Ringkern, z.B. aus ferromagnetischen Material ausgeführt ist, und der eine Sekundärwicklung SW1 aufweist, die beispielsweise mehrere Windungen n aufweist;
• - eine erste Verbindung V1 zwischen ersten Anschluss der Sekundärwicklung SWA1 und ersten Anschluss AA1 des Magnetauslösers 5;
• - eine zweite Verbindung V2 zwischen zweiten Anschluss der Sekundärwicklung SWA2 und zweiten Anschluss AA2 des Magnetauslösers 5A.

1 shows a schematic representation of a residual current circuit breaker FI, having:

• - Several input connections X1, X3, X5, NE, for the energy source-side connection of the residual current circuit breaker to an energy source, for example a low-voltage circuit or a low-voltage network;
• - Several output terminals X2, X4, X6, NA for the energy sink side connection of the residual current circuit breaker to an energy sink, such as a consumer;
• - Several conductors L1, L2, L3, N of a low-voltage circuit to be protected, a first conductor L1 being connected between the first input terminal X1 and the first output terminal X2, ditto a second conductor L2 between the second input terminal X3 and the second output terminal X4, a third conductor L3 between third input terminal X5 and third output terminal X6 is connected, a fourth conductor N, eg neutral conductor, is connected between fourth input terminal NE and fourth output terminal NA;
• - Wherein, for example, the first to third conductors L1, L2, L3 are phase conductors and the fourth conductor N is a neutral conductor or zero conductor of, for example, a three-phase alternating current circuit;
• - Several, eg first to fourth contacts K1, K2, K3, KN, which form an interruption unit K, with which the first to fourth conductors L1, L2, L3, N can be electrically opened or closed, one contact being assigned to one conductor ;
• - A switching mechanism or mechanism M connected to the contacts K1, K2, K3, KN, for opening and closing the contacts K1, K2, K3, KN;
• - A magnetic release or holding magnet release 5 connected to the mechanism M, which essentially causes the contacts K1, K2, K3, KN to open;
• - A first summation current transformer Wl, the primary side of which is formed by the conductors L1, L2, L3, N, the conductors being passed through the summation current transformer W1, the summation current transformer being designed, for example, as a toroidal core, for example made of ferromagnetic material, and having a secondary winding SW1 , which has, for example, a plurality of turns n;
• - A first connection V1 between the first connection of the secondary winding SWA1 and the first connection AA1 of the magnetic release 5;
• - A second connection V2 between the second connection of the secondary winding SWA2 and the second connection AA2 of the magnetic release 5A.

The secondary winding SW1 is connected to the magnetic release 5, so that a residual current induced in the secondary winding SW1, which exceeds a residual current value, for example, causes the magnetic release to be triggered, for example in that the magnetic release is energized, for example like a relay, so that a Tripping, i.e. a break in at least one, part or all of the contacts is caused so that the electrical circuit is broken. The interruption can be supported by a switching mechanism M, as shown.

In this example, the first summation current transformer SW1 is designed together with the magnetic release 5 in the form of a residual current circuit breaker that is independent of the mains voltage, i.e. there is a detection circuit in the form of a detection circuit that is independent of the mains voltage.

Furthermore, a test circuit, having a series connection of a key T and a resistor R, is located. The series circuit is connected to one conductor before the summation current transformer, in the example the fourth conductor N, and after the summation current transformer to another conductor, in the example the third conductor L3; where the series circuit is routed past the summation current transformer. With the series circuit or the test circuit a function test of the summation current transformer or residual current circuit breaker FI can be carried out by pressing the T button to generate an artificial residual current (current sum of the conductors through the summation current transformer not equal to zero).

2 shows a more detailed representation of the magnetic release 5. The residual current circuit breaker has a magnetic release 5 for monitoring and triggering. The magnetic release 5 is connected to the switching mechanism M via an operative connection, for example via a release lever (not shown) and has an armature 2 , a permanent magnet 4 and a yoke with a first leg 6 and a second leg 7 . In the de-energized state, a magnetic flux MF occurs in the yoke due to the permanent magnet 4, in the left figure 2 located, which is dimensioned sufficiently large to hold the armature 2 at the ends of the two legs 6 and 7 against the oppositely directed force of a spring 31.

Directly above the permanent magnet 4 is a magnetic shunt which primarily serves to keep the magnetic force of the permanent magnet constant. On one pole leg is an excitation winding EW, in the example on the second leg 7, which is connected to the secondary winding SW1 of the summation current transformer W1. In the event of a ground fault in the main circuit, conductors L1, L2, L3, N, a voltage is induced in the secondary winding SW1 of the summation current transformer W1.

The left representation in 2 shows the rest position in the error-free state. The permanent magnet drives a magnetic flux or flux of force through the two legs 6, 7, which can consist in particular of soft-magnetic material, and holds the armature 2 in place, counteracting a spring force 31.

If a voltage is generated in the secondary winding SW1, which can be seen from the middle representation in 2 is to be illustrated, it drives a current through the excitation winding EW. As a result, a second flow of force AF is generated. The effect of the permanent magnetic field MF is canceled in a half-wave by the second magnetic field AF, which is shown in the right-hand representation of FIG 2 should be illustrated.

This allows the spring 31 to pull the armature 2 from the pole faces (both ends of the two legs 6, 7 of the yoke). The armature 2 moves and triggers the separation of the contacts K1, K2, K3 KN or the interruption unit K via the switching mechanism M, for example with a switching mechanism. This interrupts the low-voltage circuit.

The summation current transformer only has to generate the small amount of energy to cancel the holding flux of the magnetic release 5, which triggers the unlatching, e.g .

3 shows a representation of a planar core structure. Two core elements 100, 110, which together form a magnetic core, for example a ferromagnetic core, powdered iron core or soft magnetic core, can be held together via connecting elements 120. A printed circuit board 200 or printed circuit board, or PCB for short, is provided between the two core halves and has conductor tracks 210 in the form of a winding or coil. That is, instead of an electrical coil or winding, a printed circuit board is used, with the conductor tracks 210 forming the coil or winding. This printed circuit board with the conductor tracks can advantageously be mass-produced.

4 shows a representation of a magnetic release 5 with a corresponding printed circuit board 200 according to the invention. The field winding EW has advantageously been replaced by a printed circuit board with the corresponding windings or coil-forming conductor tracks.

In an advantageous embodiment, the printed circuit board can be designed as a multi-layer printed circuit board, so-called multi-layer printed circuit boards, as in 4 shown. An insulating layer Iso alternates regularly with a conductive layer Cu. The conductive layer Cu has the conductor tracks according to the invention, in particular the field winding EW.

On the printed circuit board, i.e. on one or/and both surfaces, electronic components SMD of the residual current circuit breaker can also be arranged. This means that in addition to the field winding EW, electronic circuits of the residual current circuit breaker, such as a memory circuit, monitoring circuit, tripping circuit, can also be arranged or accommodated.

The multi-layer printed circuit board has a conductive layer Cu, usually made of copper, and an (electrically) insulating layer Iso, with a wide variety of insulating materials being able to be used here.

In the following, the invention is to be described further in other words.

It is proposed to design the magnetic trigger or holding magnet as a planar core transformer in conjunction with a printed circuit board or PCB, with the magnetic circuit and the printed circuit board assembly at least partially enclosing one another and the excitation winding EW being designed as (PCB) conductor tracks.

The printed circuit board 200 is a printed circuit board assembly that primarily contains the field winding EW of the magnetic circuit. In addition, electronic components can also be placed on it, such as a complete FI tripping circuit, such as for types AC, A, S, G, K, F, B, B+ residual current circuit breakers. Individual diodes, especially for AC types, can be integrated as a protective circuit. Heating elements such as heating resistors can be integrated, especially for large or low temperature ranges, e.g. for SIGRESS versions (heated holding magnet).

In order to achieve a high number of windings, in particular more than 100 windings, the circuit board/PCB can generate the windings in many small tracks on all magnet legs, i.e. on the first and second leg 6, 7, and/or over several layers, in particular inner layers.

The turns of the field winding EW are formed in the inner layers of the circuit board. In the left part of 5 Where the printed circuit board 200 protrudes from the magnetic circuit, connections can be provided, for example for the summation current transformer. Likewise for electronic components.

• - kompakterer Aufbau als bisher,
• - Verschmutzungsgrad 1 (VG 1) innerhalb der Flachbaugruppe,
• - Kombination von Magnetauslöser / Haltemagnet mit AuslöseSchaltkreis in einer Baugruppe, bisherige Lötverbindungen entfallen,
• - Lötverbindungen entfallen, Problematik Löten in der Fertigung entfällt (FPY-Abfall),
• - Gefahr Auslöseversager durch Drahtbruch/Korrosion entschärft sich,
• - höhere Kapselung, da Bewicklung mit Draht entfällt,
• - höherer Automatisierungsgrad möglich / einfachere Fertigung ermöglicht.

The invention also provides the following advantages:

• - more compact structure than before,
• - Pollution degree 1 (VG 1) within the printed circuit board,
• - Combination of magnetic trigger / holding magnet with trigger circuit in one assembly, previous soldered connections are no longer necessary,
• - Solder connections are eliminated, the problem of soldering in production is eliminated (FPY waste),
• - Danger of tripping failure due to wire breakage/corrosion is reduced,
• - higher encapsulation, as there is no wire wrapping,
• - Higher degree of automation possible / easier production enabled.

Claims (10)

Residual current circuit breaker (FI) for a low-voltage circuit having at least two conductors (L1, L2, L3, N), having: - a summation current transformer (W1) with a core, the primary side of which is formed by the conductors (L1, L2, L3, N) and the secondary side of which is formed by a secondary winding (SW1) wound onto the core, - a magnetic release (5) with an armature (2), a permanent magnet (4), a yoke with a first leg (6) and a second leg (7) , wherein the second leg (7) has an exciter winding (EW) which is connected to the secondary winding (SW1), characterized in that the exciter winding (EW) is embodied by conductor tracks (210) of a printed circuit board (200). Residual current circuit breaker (FI) after Claim 1 , characterized in that an interruption unit (K) is provided for interrupting at least one of the conductors (L1, L2, L3, N) of the low-voltage circuit. Residual current circuit breaker (FI) after patent claim 2 , characterized in that a switching mechanism (M) is provided which is connected on the one hand to the armature (2) and on the other hand to the interruption unit (K). Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the armature (2) is held under tension by a spring (31). Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the circuit board (200) is a multi-layer circuit board and the field winding (EW) is formed by several layers of conductor tracks (210). Residual current circuit breaker (FI) after Claim 5 , characterized in that the field winding (EW) is formed in particular by inner layers of the conductor tracks of the multi-layer circuit board (200). Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the magnetic release (5) is designed as a planar core transformer. Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the printed circuit board (200) contains electronic components (SMD), in particular at least one diode. Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the printed circuit board (200) contains heating elements. Residual current circuit breaker (FI) according to one of the preceding patent claims, characterized in that the printed circuit board (200) has at least some of the components of an electronic tripping circuit.

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