Dehn + Söhne Gmbh + Co Kg

Dehn Se

Dehn Se + Co Kg

Arnd Ehrhardt

Stefanie Schreiter

Peter Zahlmann

Klaus Bühler

Stephan Hierl

Uwe Strangfeld

Thomas Böhm

Georg Wittmann

Edmund Zäuner

Michael Waffler

Eduard Shulzhenko

Ralph Brocke

Bernhard Krauss

Richard Daum

Josef Birkl

Johannes Maget

Sven Wolfram

Helmut Hirschmann

Jens Ehrler

Sebastian Haas

Florian Gaeck

Stefan Hierl

Stefan Dietweger

Michael Rock

Steffen Beier

Christian Burger

Klaus Buehler

Michael Fromm

Jürgen Biohlawek

Dieter Grützmann

Wolf-Rüdiger Letzsch

Joachim Kretzschmar

Raimund KÖNIG

Ludovit Jurcacko

Ferdinand Valent

Ludovit Hüttner

Hans-Georg Wagner

Wilhelm Hohenwaldt

Anna Niesslbeck

Wilhelm Hohenwald

Werner Riel

Marco Kellermann

Nicole Hiereth

Torsten Schwandner

Kerstin Koller

The invention relates to an overvoltage protection arrangement comprising a horn spark gap located in a housing, with a chamber for arc quenching, wherein a trigger electrode is located in the ignition region of the horn spark gap, wherein a disconnecting element is provided that interrupts a connection between a trigger circuit and the trigger electrode, and thus disconnects the trigger electrode, wherein the disconnecting element is tripped or controlled by an evaluation unit that is subject to and reacts to the loading of a power follow-on current.

Overvoltage protection arrangement with a horn spark gap, located in a housing, with a chamber for arc quenching

The invention relates to a lightning protection spark gap assembly. The lightning protection spark gap assembly comprises: a lightning protection spark gap (); a safety fuse device () which can be triggered by a bridge initiator () and which is connected between a first or second voltage line (S, S) and a corresponding main connection () of the lighting protection spark gap (); and an indicator device (') for detecting a secondary current flow connecting to a pulse current flow or a corresponding portion of the secondary current flow, and for triggering the safety fuse device () by activating the bridge initiator () when the detected secondary current flow or the corresponding portion of the secondary current flow fulfills a first predefined criterion, wherein the lightning protection spark gap () has a first and a second divergent electrode () and an arcing chamber (), and wherein the indicator device (&#x2032;) is electrically connected to the first or second divergent electrode () and/or the arcing chamber () in such a way that it detects the secondary current flow or the corresponding portion of the secondary current flow in the area (L) in which the secondary current arc flows.

Lightning protection spark gap assembly and method for operating a lightning protection spark gap assembly

The invention relates to a triggered fuse for low-voltage applications for protecting devices that can be connected to a power supply system, in particular surge protection devices, consisting of at least one fusible conductor which is located between two contacts and is arranged in a housing, and also consisting of a trigger device for controlled disconnection of the fusible conductor in the event of malfunctions or overload states of the respective connected device, wherein an arc quenching medium is introduced into the housing. The at least one fusible conductor has a plurality of conventional electrical bottlenecks, which are designed for the rated load of the respective fuse. At least one further additional geometric bottleneck is provided, which is disconnectable by rupturing depending on the trigger unit when applied by tension.

Triggered fuse for low-voltage applications

The invention relates to an overvoltage protection arrangement comprising a horn spark gap located in an insulating housing, with a deionization chamber for arc quenching, wherein the deionization chamber has a plurality of spaced quench plates and a trigger electrode is located in the ignition region of the horn spark gap, wherein a disconnecting device comprises a fusible link that is located in the region of the deionization chamber and is exposed there to a loading of a power follow-on current, wherein the fusible link holds a disconnecting element, preferably supported by spring force, in a first position, and on melting releases this disconnecting element in such a way that the disconnecting element adopts a second position wherein, on reaching the second position, an electrical connection to the trigger electrode is interrupted and the trigger electrode is thereby disconnected.

Over-voltage protection arrangement having a horn gap located in an insulating housing having a deionization chamber for arc extinguishing

A lightning protection spark gap assembly comprises: a lighting protection spark gap having a first main connection and a second main connection, wherein a first voltage line of a supply network is connectable to the first main connection and a second voltage line of the supply network is connectable to the second main connection; a safety fuse device which is triggerable and which is connectable between the first or second voltage line and the corresponding main connection of the lightning protection spark gap, wherein at least one current path leading via the lighting protection spark gap is formable between the first voltage line and the second voltage line during operation; an indicator device for detecting a current flow in the current path or a corresponding portion of the current flow in the current path and for mechanically or electrically delayed triggering of the safety fuse device.

The invention relates to a device for detecting electrical currents on or in the vicinity of electrical conductors with at least one Reed switch as a magnetically responsive switch, which is arranged in the vicinity of the electrical conductor such that, when there is a significant current flow through the conductor, the magnetic field created triggers the switch and initiates an evaluation electronics connected to the switch. For the detection of surge current variables and the differentiation between long-term pulsed currents and short-term pulsed currents, a plurality of Reed switches are arranged at a predetermined distance from the electrical conductor, wherein the evaluation electronics determines the response and the switching times of the respective Reed switches, determines die surge current variable from the allocation of the determined values to the respective Reed switch and the pulse form from the switching time, wherein, for the purpose of adjusting the response behavior, at least one of the Reed switches comprises a shielding for influencing the magnetic field acting on the respective Reed switch.

Device for detecting electrical currents on or in the vicinity of electrical conductors

The invention relates to a triggered fuse for low-voltage applications for protecting devices that can be connected to a power supply system, in particular surge protection devices, consisting of at least one fusible conductor which is located between two contacts and is arranged in a housing, and also consisting of a trigger device for controlled disconnection of the fusible conductor in the event of malfunctions or overload states of the respective connected device, wherein an arc quenching medium is introduced into the housing. By way of example, an arc quenching medium-free region is formed in the housing such that the at least one fusible conductor is exposed, and a mechanical disconnection element can be introduced into the arc quenching medium-free region via an access point in the housing in order to mechanically destroy the at least one fusible conductor depending on the trigger device, and independently of its melting integral.

The invention relates to a method for detecting electrical currents on or near electrical conductors with at least one reed switch as a magnetically responsive switch, which is arranged near the electrical conductor such that when there is a significant current flow through the conductor, the magnetic field created triggers the switch and initiates evaluation electronics connected to the switch. For the detection of surge current variables and differentiation between long-term pulsed currents and short-term pulsed currents, a plurality of reed switches is arranged at pre-determined, different, increasing distances from the electrical switch, the evaluation electronics determining the response and the switching times of the respective reed switches. The surge current variables are determined from the association of the determined values with the respective reed switch and the pulse shape from the switching time.

Device for detecting electrical currents on or near electrical conductors

The invention relates to a short-circuiting device for use in low-voltage and medium-voltage systems for the protection of property and persons, comprising: a switching element, which can be operated by the tripping signal of a fault detection device; two mutually opposite contact electrodes having power supply means, which contact electrodes can be brought into contact with an electrical circuit having connection points at different potential; furthermore, in at least one of the contact electrodes, a movable contact part, which is under mechanical preload and executes a movement to the further contact electrode with the assistance of spring force in the event of a short circuit; and a sacrificial element as a spacer between the contact electrodes, with an electrical connection between the sacrificial element and the switching element on the one hand and one of the contact electrodes on the other hand, in order to deliberately cause current-flow-induced thermal deformation or destruction of the sacrificial element. According to the invention, the movable contact part is in the form of a hollow cylinder which is closed on one side, and a spring for generating preload is inserted in the hollow cylinder. The hollow cylinder is movably guided in a complementary cutout in the first contact electrode, a sliding contact thus being formed. In the region of the base of the closed hollow cylinder, the cylinder wall of said hollow cylinder transitions into a cone at the outer circumference. Furthermore, a first pin-like extension, opposite to which a second pin-like extension insulated from the contact electrodes is situated, extends within the hollow cylinder, proceeding from the base. The sacrificial element, in the form of a bolt or screw, is arranged between the first and the second pin-like extension. A cutout, which has an internal cone and is matched to the external cone of the movable contact, is provided in the second contact electrode. The external cone and the internal cone form a bounce-free short-circuit contact region having frictional locking and interlocking connection on account of plastic deformation which occurs. Furthermore, according to the invention the switching element is designed as an auxiliary short-circuiter on the basis of an electric match.

Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of property and persons

The invention relates to a short-circuiting device for use in low-voltage and medium-voltage systems for protecting parts and personnel, comprising a switching element which can be operated by the tripping signal of a fault detection device, two mutually opposite contact electrodes having power supply means, wherein contact can be made with said contact electrodes at an electrical circuit having connections at different potentials, furthermore, in at least one of the contact electrodes, a moving contact part which is under mechanical prestress and executes a movement to the further contact electrode in a manner assisted by spring force in the event of a short circuit, a sacrificial element as spacer between the contact electrodes and also having an electrical connection between the sacrificial element and the switching element on the one hand and one of the contact electrodes on the other hand, in order to cause current flow-induced thermal deformation or destruction of the sacrificial element in a targeted manner. According to the invention, the moving contact part is in the form of a hollow cylinder which is closed on one side and a spring for generating prestress is used in the hollow cylinder. The hollow cylinder is guided in a movable manner in a complementary cutout in the first contact electrode so as to form a sliding contact. In the region of the base of the closed hollow cylinder, the cylinder wall of said hollow cylinder is configured to turn into a cone on its outer circumferential side. Furthermore, starting from the base, a first pin-like extension which is situated opposite a second pin-like projection which is insulated from the contact electrodes is arranged in the interior of the hollow cylinder, wherein the sacrificial element, in the form of a bolt or screw, is arranged between the first and the second pin-like projection. A cutout which is matched to the external cone of the moving contact and has an internal cone is provided in the second contact electrode, wherein the external cone and internal cone form a bounce-free short-circuit contact region with a force-fitting and interlocking connection on account of the plastic deformation which occurs.

Short-circuiting device for use in low-voltage and medium-voltage systems for protecting parts and personnel

The invention relates to an overvoltage protection device with a short-circuit function for protecting installations and persons for low-voltage installations, wherein at least one overvoltage protection element and a thermally activatable short-circuit device are arranged in a common housing. The device is designed to be inserted into an NH fuse part, and the common housing is designed with contact blades so as to be spatially analogous to a NH fuse link.

Overvoltage protection device with short-circuit function for protecting installations and persons

The invention relates to a single- or multi-pole switching device, in particular for DC applications, having at least one rotating switching element () which is connected to a drive, and also comprising switching contacts (), connection pieces () and connection poles or connection terminals () and a housing arrangement which accommodates the abovementioned parts. According to the invention, a movably guided rotary cylinder () is formed in the housing arrangement, said rotary cylinder being located in a body which is designed as a rotary cylinder holder (). The rotary cylinder () has at least one contact pin () which passes radially or tangentially or eccentrically through the rotary cylinder and has, at its end, a contact piece () in each case. Mating contact pieces () are arranged in the rotary cylinder holder (), said mating contact pieces being electrically connected to the connection pieces () or connection poles or connection terminals (). A narrow, arc-influencing gap is present between the rotary cylinder () and the rotary cylinder holder (), wherein, as a result of the movement of the rotary cylinder (), the electrical connection between the contact pieces () and the mating contact pieces () can be broken by way of the contact pin () and the resulting disconnection arcs () enter the air gap subject to an extension and are rapidly extinguished there.

Single- or multi-pole switching device, in particular for DC applications

The invention relates to a spark gap having a plurality of individual spark gaps connected in series and present in a stacked arrangement, spaced apart from each other by insulating spacers () and nearly free of secondary current under typical operating conditions, wherein the individual spark gaps comprise electrodes () and outer connection electrodes are provided, and further having control elements for influencing the voltage distribution across the stacked arrangement and/or designed as an ignition aid. According to the invention, a mechanically pretensioned insulating element () can be inserted or pivoted between two adjacent electrodes () of the individual spark gaps, in order to interrupt the main current path of the spark gap in case of fault or overload.

Spark gap having a plurality of individual spark gaps connected in series and present in a stacked arrangement

The invention relates to a rapid disconnect device for surge arrestors, in particular plate-type or flat varistors, comprising at least one element that is maintained under a mechanical stress, and a disconnection point for disconnecting the surge arrestor from the respective power grid upon thermal overload, wherein the disconnection point comprises contacts, the positions of which vary relative to one another, wherein one of said contacts is designed to be fixed. According to the invention, the contacts of varying positions relative to one another are electrically connected without the use of solder in such a way that incident current forces act primarily in the contact force direction and such that the moving contacts of the positionally-variable contacts of a lost element located at the surge arrestor and thermally detachable therefrom can be moved from a closed position to the disconnected position.

Rapid disconnect device

The invention relates to a horn spark gap lightning arrestor with a deion chamber () for quenching arcs in a housing () and controlling the internal gas flow for adjusting a different response of the arc produced in the case of power pulse current loading, on the one hand, and of the arc induced by follow-on current, on the other hand. For this purpose, the distance between the opposite electrode faces of the horn spark gap in the striking region is kept very small and there is only a slight widening of the distance in the diction of the end of the horn spark gap in order to prevent undesired migration of the arc in the event of lighting pulse current.

Horn spark gap lightning arrestor with a deion chamber

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Neumarkt/Opf., Germany

Arnd Ehrhardt