EP0393628B1 - Casing for an electromechanic component - Google Patents

Casing for an electromechanic component Download PDF

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Publication number
EP0393628B1
EP0393628B1 EP90107356A EP90107356A EP0393628B1 EP 0393628 B1 EP0393628 B1 EP 0393628B1 EP 90107356 A EP90107356 A EP 90107356A EP 90107356 A EP90107356 A EP 90107356A EP 0393628 B1 EP0393628 B1 EP 0393628B1
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EP
European Patent Office
Prior art keywords
housing
ventilation opening
wall
insulation
casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90107356A
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German (de)
French (fr)
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EP0393628A2 (en
EP0393628A3 (en
Inventor
Harry Dipl.-Ing. Schröder (FH)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0393628A2 publication Critical patent/EP0393628A2/en
Publication of EP0393628A3 publication Critical patent/EP0393628A3/en
Application granted granted Critical
Publication of EP0393628B1 publication Critical patent/EP0393628B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H01H9/047—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings provided with venting means

Definitions

  • the invention relates to a housing for an electromechanical component with a housing wall that seals off a hollow interior and has a ventilation opening that is open to the outside or prepared for opening.
  • these are electromagnetic relays with a plastic housing or similar switching devices.
  • Relays with a plastic housing are usually sealed using adhesive, casting resin or the like, so that the sensitive parts inside the housing, in particular the contacts, are protected against the harmful effects of washing solutions, soldering agents and the like.
  • the tight closure of the housing can, however, be disadvantageous for the further life of a relay or a similar component, since the plastic housing, the coil and other parts in the relay release contact-harmful precipitates over time, which create a microclimate within the closed housing, which can be more harmful to the contacts than the normal outside air. It is therefore common practice to provide a ventilation opening in the housing, which, for example, only opens (again) after a relay has been installed. For example, it is known to pierce a prepared thin-walled section of a relay wall (DE-A-30 39 702) or to separate a cylindrical or rectangular slug on a housing corner (DE-U-87 03 079). But there is also the possibility to first cover an opening already formed in the housing with a film and to remove this film after washing and soldering the relay.
  • the object of the invention is to design a housing for an electromechanical component with a ventilation opening so that even when installed in the vicinity of foreign metallic parts, the required insulating distances can always be guaranteed from the outside of the housing to the metallic or live parts inside the component .
  • this object is achieved in that the ventilation opening in the interior of the housing opens into an insulation shaft which is separated from the metallic parts in the interior of the housing by an insulation wall extending from the housing wall and is open towards the interior of the housing at least at its end opposite the ventilation opening.
  • the insulation shielding of the ventilation opening in the interior of the housing By means of the insulation shielding of the ventilation opening in the interior of the housing according to the invention, the insulation distances required in each case can be ensured regardless of where the component is installed and which metallic or live parts are always in the vicinity.
  • the insulation wall is expediently attached in such a way that, together with sections of side walls of the housing, it separates a corner region as an insulation shaft.
  • the insulation wall may also be expedient for the insulation wall to extend in the form of a tubular jacket from the ventilation opening into the interior of the housing, the tubular cross section being circular, rectangular or any other shape. In this way, unused cavities inside the housing can be used to accommodate the insulation shaft without increasing the volume of the housing. If possible, however, the ventilation opening and the insulation shaft should be placed as close as possible to the switch contacts, since ventilation is then most effective for the service life.
  • the insulation wall is expediently also molded directly onto the cap.
  • FIG. 1 A partially cut-open relay housing is shown in FIG. 1, with a base 1 with two fixed contact elements 2 and 3 and a center contact spring 4 being shown only schematically in the interior.
  • the contacts are actuated in a conventional manner without having to be discussed in relation to the invention.
  • the base 1 together with a cap 5 forms the relay housing, which is additionally sealed on the underside with casting compound 14.
  • the top wall 5a is provided at one corner with a shoulder 5b on which a detachable pin or slug 7, also known as a “nip-off pin”, is seated.
  • a detachable pin or slug 7 also known as a “nip-off pin”
  • a channel extends from the inside of the housing, which forms the ventilation opening 6 after the slug has been separated.
  • FIG. 1 also schematically shows a printed circuit board 8 arranged above the relay housing, in which a live connecting pin 9 can, for example, come to rest on the ventilation opening 6 of the relay housing.
  • a live connecting pin 9 can, for example, come to rest on the ventilation opening 6 of the relay housing.
  • the air gap or insulation gap 10 shown in dotted lines in FIG. 1, between the pin 9 and the contact elements 2 and 3 in the interior of the relay is sufficiently long to ensure the necessary security against electrical flashover.
  • This air gap is ensured by an insulation shaft 11 being formed by an additional insulation wall 12 in the interior of the housing following the ventilation opening 6.
  • the insulation shaft 11 can also be limited to the corner in that the insulation wall 12, with a small portion of the side walls 5c and 5d of the housing cap, separates a small volume of the interior of the housing.
  • the position of this insulation wall 12 is shown in FIG. 2 in a plan view of the housing, the slug 7 being separated and exposing the ventilation opening 6.
  • FIG. 3 A further development is shown in FIG. 3 in that, in addition to the insulation wall 12 molded onto the cap 5, a further partition 13 is attached to the base 1.
  • the overlap between the insulation wall 12 and the partition wall 13 results in a further extension of the insulation path 10 due to the labyrinth effect.
  • FIG 4 Another embodiment is shown in FIG 4, where only a housing cap is shown in section.
  • the cap 15 has a weakened section 16 somewhere in the middle region of the upper side, which is pierced in order to obtain the desired ventilation opening.
  • an insulation shaft 17 is formed in the form of a tube, so that in this case the insulation wall 18 forms the tube jacket. The position of this tubular insulation shaft 17 depends on the available spatial conditions in the interior of the component.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Casings For Electric Apparatus (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Lock And Its Accessories (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Breakers (AREA)
  • Packages (AREA)

Abstract

In a component casing, especially a relay, which has a ventilation opening, this ventilation opening (6) opens in the interior of the casing into an insulation shaft (11) which is separated from the metallic parts (2, 3, 4) in the interior of the casing by an insulating wall (12), originating from the casing wall (5a), and which is open to the interior of the casing at least on its end (11a) located opposite to the ventilation opening (6). In consequence, the necessary insulation paths between the live parts (2, 3, 4) in the interior of the casing and the adjacent metallic parts outside the casing are guaranteed, even after opening the ventilation opening (6). <IMAGE>

Description

Die Erfindung betrifft ein Gehäuse für ein elektromechanisches Bauelement mit einer einen hohlen Innenraum dicht abschließenden Gehäusewand, die eine nach außen offene oder zur Öffnung vorbereitete Belüftungsöffnung aufweist. Insbesondere handelt es sich dabei um elektromagnetische Relais mit einem Kunststoffgehäuse oder um ähnliche Schaltgeräte.The invention relates to a housing for an electromechanical component with a housing wall that seals off a hollow interior and has a ventilation opening that is open to the outside or prepared for opening. In particular, these are electromagnetic relays with a plastic housing or similar switching devices.

Relais mit Kunststoffgehäuse werden üblicherweise mittels Kleber, Gießharz oder dergleichen abgedichtet, damit die empfindlichen Teile im Gehäuseinneren, insbesondere die Kontakte, gegen die schädlichen Einflüsse von Waschlösungen, Lötmitteln und dergleichen geschützt werden.Relays with a plastic housing are usually sealed using adhesive, casting resin or the like, so that the sensitive parts inside the housing, in particular the contacts, are protected against the harmful effects of washing solutions, soldering agents and the like.

Der dichte Abschluß des Gehäuses kann aber für die weitere Lebensdauer eines Relais oder eines ähnliches Bauelementes unter Umständen nachteilig sein, da das Kunststoffgehäuse, die Spule und sonstige Teile im Relais im Lauf der Zeit kontaktschädliche Ausscheidungen abgeben, die innerhalb des abgeschlossenen Gehäuses ein Kleinklima erzeugen, welches für die Kontakte schädlicher sein kann als die normale Außenluft. Deshalb ist es vielfach üblich, im Gehäuse eine Belüftungsöffnung vorzusehen, die beispielsweise erst nach dem Einbau eines Relais (wieder) geöffnet wird. So ist es beispielsweise bekannt, einen vorbereiteten dünnwandigen Abschnitt einer Relaiswand zu durchstoßen (DE-A-30 39 702) oder einen zylindrischen bzw. rechteckförmigen Butzen an einer Gehäuseecke abzutrennen (DE-U-87 03 079). Es gibt aber auch die Möglichkeit, einen bereits im Gehäuse eingeformten Durchbruch zunächst mit einer Folie abzudecken und diese Folie nach dem Waschen und Löten des Relais abzuziehen.The tight closure of the housing can, however, be disadvantageous for the further life of a relay or a similar component, since the plastic housing, the coil and other parts in the relay release contact-harmful precipitates over time, which create a microclimate within the closed housing, which can be more harmful to the contacts than the normal outside air. It is therefore common practice to provide a ventilation opening in the housing, which, for example, only opens (again) after a relay has been installed. For example, it is known to pierce a prepared thin-walled section of a relay wall (DE-A-30 39 702) or to separate a cylindrical or rectangular slug on a housing corner (DE-U-87 03 079). But there is also the possibility to first cover an opening already formed in the housing with a film and to remove this film after washing and soldering the relay.

Bei derartigen Belüftungsöffnungen besteht nun die Gefahr, daß an der Innenseite der Belüftungsöffnung angeordnete Metallteile nicht mehr genügend große Isolierstrecken gegenüber anderen spannungsführenden Teilen außerhalb des Relais besitzen. Dies kann beispielsweise dann eintreten, wenn das Relais auf einer ersten Leiterplatte eingebaut ist und mit der Belüftungsöffnung auf seiner Oberseite unmittelbar in der Nachbarschaft einer Leiterbahn oder eines spannungsführenden Anschlußstückes einer zweiten Leiterplatte zu liegen kommt. Schwierigkeiten ergeben sich dann insbesondere, wenn es sich um Netzrelais handelt, bei denen zur Sicherheit gegen elektrischen Schlag lange Kriech- und Luftstrecken, beispielsweise von mindestens 8 mm, erforderlich und vorgeschrieben sind.With such ventilation openings there is now a risk that metal parts arranged on the inside of the ventilation opening no longer have sufficient insulation distances from other live parts outside the relay. This can occur, for example, when the relay is installed on a first printed circuit board and the ventilation opening on its upper side comes to lie directly in the vicinity of a conductor track or a live connector on a second printed circuit board. Difficulties arise, in particular, when it comes to network relays in which long creepage distances and clearances, for example of at least 8 mm, are required and prescribed to protect against electric shock.

Aufgabe der Erfindung ist es, ein Gehäuse für ein elektromechanisches Bauelement mit einer Belüftungsöffnung so zu gestalten, daß auch beim Einbau in der Nähe von metallischen Fremdteilen immer die erforderlichen Isolierstrecken von der Gehäuseaußenseite zu den metallischen bzw. spannungsführenden Teilen im Inneren des Bauelementes gewährleistet werden können.The object of the invention is to design a housing for an electromechanical component with a ventilation opening so that even when installed in the vicinity of foreign metallic parts, the required insulating distances can always be guaranteed from the outside of the housing to the metallic or live parts inside the component .

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Belüftungsöffnung im Gehäuseinneren in einen Isolationsschacht mündet, der durch eine von der Gehäusewand ausgehende Isolationswand von den metallischen Teilen im Gehäuseinneren getrennt und zumindest an seinem der Belüftungsöffnung gegenüberliegenden Ende zum Gehäuseinneren hin offen ist.According to the invention, this object is achieved in that the ventilation opening in the interior of the housing opens into an insulation shaft which is separated from the metallic parts in the interior of the housing by an insulation wall extending from the housing wall and is open towards the interior of the housing at least at its end opposite the ventilation opening.

Durch die erfindungsgemäße Isolations-Abschirmung der Belüftungsöffnung im Gehäuseinneren können also die jeweils erforderlichen Isolationsstrecken unabhängig davon gewährleistet werden, wo das Bauelement eingebaut wird und welche metallischen bzw. spannungsführenden Teile auch immer in der Nachbarschaft liegen.By means of the insulation shielding of the ventilation opening in the interior of the housing according to the invention, the insulation distances required in each case can be ensured regardless of where the component is installed and which metallic or live parts are always in the vicinity.

Ist die Belüftungsöffnung in einem Eckenbereich des Gehäuses vorgesehen, dann wird zweckmäßigerweise die Isolationswand so angebracht, daß sie zusammen mit Abschnitten von Seitenwänden des Gehäuses einen Eckenbereich als Isolationsschacht abtrennt.If the ventilation opening is provided in a corner region of the housing, then the insulation wall is expediently attached in such a way that, together with sections of side walls of the housing, it separates a corner region as an insulation shaft.

In einem anderen Fall kann es jedoch auch zweckmäßig sein, daß die Isolationswand sich in Form eines Rohrmantels von der Belüftungsöffnung in das Gehäuseinnere erstreckt, wobei der Rohrquerschnitt kreisförmig, rechteckförmig oder sonstwie beliebig geformt sein kann. Auf diese Weise können unbenutzte Hohlräume im Gehäuseinneren ausgenutzt werden, um den Isolationsschacht ohne Vergrößerung des Gehäusevolumens unterbringen zu können. Wenn möglich, sollte allerdings die Belüftungsöffnung und entsprechend der Isolationsschacht möglichst nahe an den Schaltkontakten angebracht werden, da die Belüftung dann für die Lebensdauer am wirksamsten ist.In another case, however, it may also be expedient for the insulation wall to extend in the form of a tubular jacket from the ventilation opening into the interior of the housing, the tubular cross section being circular, rectangular or any other shape. In this way, unused cavities inside the housing can be used to accommodate the insulation shaft without increasing the volume of the housing. If possible, however, the ventilation opening and the insulation shaft should be placed as close as possible to the switch contacts, since ventilation is then most effective for the service life.

Da die Belüftungsöffnung üblicherweise in der oberseitigen Wand einer Kappe aus Isolierstoff vorgesehen ist, wird zweckmäßigerweise auch die Isolationswand unmittelbar an der Kappe angeformt.Since the ventilation opening is usually provided in the top wall of a cap made of insulating material, the insulation wall is expediently also molded directly onto the cap.

Die Erfindung wird nachfolgend an Ausführungsbeispielen anhand der Zeichnung näher erläutert. Es zeigt

  • FIG 1 ein erfindungsgemäße gestaltetes Relaisgehäuse, teilweise im Schnitt, in der Anordnung unterhalb einer Leiterplatte,
  • FIG 2 das Gehäuse von FIG 1 in Draufsicht mit abgetrenntem Butzen,
  • FIG 3 eine etwas abgewandelte Ausführungsform des Relaisgehäuses von FIG 1 und
  • FIG 4 eine abgewandelte Ausführungsform einer Relaiskappe im Schnitt.
The invention is explained in more detail below using exemplary embodiments with reference to the drawing. It shows
  • 1 shows a relay housing designed according to the invention, partly in section, in the arrangement below a printed circuit board,
  • 2 shows the housing of FIG. 1 in plan view with the slug separated,
  • 3 shows a somewhat modified embodiment of the relay housing of FIG. 1 and
  • 4 shows a modified embodiment of a relay cap in section.

In FIG 1 ist ein teilweise aufgeschnittenes Relaisgehäuse gezeigt, wobei im Inneren lediglich schematisch ein Sockel 1 mit zwei feststehenden Kontaktelementen 2 und 3 sowie einer Mittelkontaktfeder 4 dargestellt ist. Die Betätigung der Kontakte erfolgt in üblicher Weise, ohne daß hierauf im Hinblick auf die Erfindung eingegangen zu werden braucht.A partially cut-open relay housing is shown in FIG. 1, with a base 1 with two fixed contact elements 2 and 3 and a center contact spring 4 being shown only schematically in the interior. The contacts are actuated in a conventional manner without having to be discussed in relation to the invention.

Der Sockel 1 bildet zusammen mit einer Kappe 5 das Relaisgehäuse, welches an der Unterseite mit Vergußmasse 14 zusätzlich abgedichtet ist. Zur Schaffung einer Belüftungsöffnung 6 ist die oberseitige Wand 5a an einer Ecke mit einem Absatz 5b versehen, auf dem ein abtrennbarer Zapfen oder Butzen 7, auch "nip-off-pin" genannt, sitzt. In diesen Butzen 7 erstreckt sich von der Gehäuseinnenseite her ein Kanal, der nach Abtrennung des Butzens die Belüftungsöffnung 6 bildet.The base 1 together with a cap 5 forms the relay housing, which is additionally sealed on the underside with casting compound 14. To create a ventilation opening 6, the top wall 5a is provided at one corner with a shoulder 5b on which a detachable pin or slug 7, also known as a “nip-off pin”, is seated. In this slug 7, a channel extends from the inside of the housing, which forms the ventilation opening 6 after the slug has been separated.

In FIG 1 ist weiterhin schematisch eine oberhalb des Relaisgehäuses angeordnete Leiterplatte 8 dargestellt, bei der ein spannungsführender Anschlußstift 9 beispielsweise zufällig über der Belüftungsöffnung 6 des Relaisgehäuses zu liegen kommen kann. In diesem Fall muß also sichergestellt werden, daß die Luftstrecke bzw. Isolationsstrecke 10, in FIG 1 punktiert gezeichnet, zwischen dem Stift 9 und den Kontaktelementen 2 und 3 im Relaisinneren genügend lang ist, um die erforderliche Sicherheit gegen einen elektrischen Überschlag zu gewährleisten. Diese Luftstrecke wird dadurch gewährleistet, daß im Gehäuseinneren im Anschluß an die Belüftungsöffnung 6 ein Isolationsschacht 11 durch eine zusätzliche Isolationswand 12 gebildet ist. Da die Belüftungsöffnung 6 in einer Ecke des Relaisgehäuses liegt, kann der Isolationsschacht 11 ebenfalls auf die Ecke beschränkt sein, indem die Isolationswand 12 mit jeweils einem kleinen Abschnitt der Seitenwände 5c und 5d der Gehäusekappe ein kleines Volumen des Gehäuseinneren abtrennt. Die Lage dieser Isolationswand 12 ist in FIG 2 in einer Draufsicht auf das Gehäuse gezeigt, wobei der Butzen 7 abgetrennt ist und die Belüftungsöffnung 6 freigibt.FIG. 1 also schematically shows a printed circuit board 8 arranged above the relay housing, in which a live connecting pin 9 can, for example, come to rest on the ventilation opening 6 of the relay housing. In this case it must therefore be ensured that the air gap or insulation gap 10, shown in dotted lines in FIG. 1, between the pin 9 and the contact elements 2 and 3 in the interior of the relay is sufficiently long to ensure the necessary security against electrical flashover. This air gap is ensured by an insulation shaft 11 being formed by an additional insulation wall 12 in the interior of the housing following the ventilation opening 6. Since the ventilation opening 6 lies in a corner of the relay housing, the insulation shaft 11 can also be limited to the corner in that the insulation wall 12, with a small portion of the side walls 5c and 5d of the housing cap, separates a small volume of the interior of the housing. The position of this insulation wall 12 is shown in FIG. 2 in a plan view of the housing, the slug 7 being separated and exposing the ventilation opening 6.

In FIG 3 ist eine Weiterbildung insofern gezeigt, als dort zusätzlich zu der an der Kappe 5 angespritzten Isolationswand 12 eine weitere Trennwand 13 am Sockel 1 angebracht ist. Durch die Überlappung zwischen der Isolationswand 12 und der Trennwand 13 ergibt sich eine weitere Verlängerung der Isolationsstrecke 10 infolge des Labyrintheffektes.A further development is shown in FIG. 3 in that, in addition to the insulation wall 12 molded onto the cap 5, a further partition 13 is attached to the base 1. The overlap between the insulation wall 12 and the partition wall 13 results in a further extension of the insulation path 10 due to the labyrinth effect.

Eine weitere Ausführungsmöglichkeit zeigt FIG 4, wo lediglich eine Gehäusekappe im Schnitt dargestellt ist. In diesem Fall besitzt die Kappe 15 irgendwo im Mittenbereich der Oberseite einen geschwächten Abschnitt 16, der durchstoßen wird, um die gewünschte Belüftungsöffnung zu erhalten. Unterhalb dieses Abschnittes 16 ist ein Isolationsschacht 17 in Form eines Rohres angeformt, so daß also die Isolationswand 18 in diesem Fall den Rohrmantel bildet. Die Lage dieses rohrförmigen Isolationsschachtes 17 richtet sich je nach den zur Verfügung stehenden räumlichen Verhältnissen im Inneren des Bauelementes.Another embodiment is shown in FIG 4, where only a housing cap is shown in section. In this case, the cap 15 has a weakened section 16 somewhere in the middle region of the upper side, which is pierced in order to obtain the desired ventilation opening. Below this section 16, an insulation shaft 17 is formed in the form of a tube, so that in this case the insulation wall 18 forms the tube jacket. The position of this tubular insulation shaft 17 depends on the available spatial conditions in the interior of the component.

Claims (5)

  1. Housing for an electromechanical component having a housing wall (5a; 15) which tightly seals a hollow inner space and has a ventilation opening (6; 16) which is open towards the outside or is prepared for being opened, characterized in that the ventilation opening (6; 16) in the inside of the housing opens into an insulation channel (11; 17) which is separated from the metallic parts (2, 3, 4) in the inside of the housing by an insulation wall (12; 18) coming from the housing wall (5a; 15) and is open towards the inside of the housing at least at its end (11a) opposite the ventilation opening (6; 16).
  2. Housing according to Claim 1, characterized in that the insulation wall (12) together with sections of side walls (5c, 5d) of the housing partitions off a corner region as insulation channel (11).
  3. Housing according to Claim 1, characterized in that the insulation wall (18) extends in the shape of an outer tube surface from the ventilation opening (16) into the inside of the housing.
  4. Housing according to one of Claims 1 to 3, characterized in that a further insulating partition (13) is provided inside the housing, which insulating partition extends in the opposite direction to the insulation wall (12) and over-laps at least partially with the latter like a maze.
  5. Housing according to one of Claims 1 to 4, characterized in that the ventilation opening (6, 16) is provided in the topside wall (5c) of a cap of insulating material, and in that the insulation wall (12; 18) integrally formed on the cap (5) extends from the topside downwards in the direction of the base (1) of the housing.
EP90107356A 1989-04-21 1990-04-18 Casing for an electromechanic component Expired - Lifetime EP0393628B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8905080U DE8905080U1 (en) 1989-04-21 1989-04-21
DE8905080U 1989-04-21

Publications (3)

Publication Number Publication Date
EP0393628A2 EP0393628A2 (en) 1990-10-24
EP0393628A3 EP0393628A3 (en) 1992-05-20
EP0393628B1 true EP0393628B1 (en) 1994-11-09

Family

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EP90107356A Expired - Lifetime EP0393628B1 (en) 1989-04-21 1990-04-18 Casing for an electromechanic component

Country Status (6)

Country Link
US (1) US5051540A (en)
EP (1) EP0393628B1 (en)
JP (1) JPH02136947U (en)
AT (1) ATE114075T1 (en)
DE (2) DE8905080U1 (en)
PT (1) PT8333U (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8900466U1 (en) * 1989-01-17 1989-03-02 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
JP5711044B2 (en) * 2010-12-02 2015-04-30 富士電機株式会社 Magnetic contactor, gas sealing method of magnetic contactor, and method of manufacturing magnetic contactor
CN112788936A (en) * 2020-12-31 2021-05-11 杭州拓深科技有限公司 Three-phase electrical fire detection alarm capable of preventing electric shock and electrostatic breakdown

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US1820375A (en) * 1925-04-03 1931-08-25 Ohio Brass Co Molded receptacle
US1935465A (en) * 1931-06-01 1933-11-14 Bosch Robert Interrupter for ignition apparatus
US2870300A (en) * 1957-05-20 1959-01-20 Morse Milton Pressure equalizing hermetically sealing boot
US3336457A (en) * 1965-10-01 1967-08-15 Gen Motors Corp Filter for ignition distributor
DE2016902B2 (en) * 1970-04-09 1972-03-02 E Haller & Co, 7209 Wehingen RELAY COVER
JPS6021878Y2 (en) * 1979-10-23 1985-06-29 富士通株式会社 Relay for printed board
JPS53156056U (en) * 1977-05-13 1978-12-07
JPS5539154A (en) * 1978-09-12 1980-03-18 Matsushita Electric Works Ltd Method of fabricating gassfilled electric switch
DE2942258A1 (en) * 1979-10-19 1981-05-07 Robert Bosch Gmbh, 7000 Stuttgart ELECTRICAL DEVICE, PREFERABLY RELAY FOR MOTOR VEHICLES
DE3176825D1 (en) * 1980-09-01 1988-09-01 Fujitsu Ltd Electromagnetic relay and method of manufacturing the same
DE8703079U1 (en) * 1987-02-27 1987-04-16 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De

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Publication number Publication date
DE8905080U1 (en) 1990-08-16
EP0393628A2 (en) 1990-10-24
US5051540A (en) 1991-09-24
EP0393628A3 (en) 1992-05-20
PT8333U (en) 1994-09-30
JPH02136947U (en) 1990-11-15
DE59007666D1 (en) 1994-12-15
PT8333T (en) 1992-03-31
ATE114075T1 (en) 1994-11-15

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