CA1330826C - Surge suppresor with insulating meltable wall and leaf springs for overcurrent shorting - Google Patents
Surge suppresor with insulating meltable wall and leaf springs for overcurrent shortingInfo
- Publication number
- CA1330826C CA1330826C CA000578079A CA578079A CA1330826C CA 1330826 C CA1330826 C CA 1330826C CA 000578079 A CA000578079 A CA 000578079A CA 578079 A CA578079 A CA 578079A CA 1330826 C CA1330826 C CA 1330826C
- Authority
- CA
- Canada
- Prior art keywords
- suppressor
- chamber
- contact
- overvoltage
- contacts
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Landscapes
- Fuses (AREA)
- Emergency Protection Circuit Devices (AREA)
- Thermistors And Varistors (AREA)
- Protection Of Static Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A thermal protection device for overvoltage suppressor which includes spaced contacts mounted in overvoltage suppressor magazines of communication systems.
A bow-type spring and a melt element are arranged with the overvoltage suppressor which is mounted in a chamber of a case body or housing. The melt element is pierced by at least one arm of the bow-type spring when an overvoltage occurs for short-circuiting the two contacts of the overvoltage suppressor. A thermal protection device with simple components prevents creepage currents between the bow-type spring and the contacts of the overvoltage suppressor, a chamber for the overvoltage suppressor is adjacent and abutting to a separate chamber formed in the case body for accommodating a bow-type spring. Between the two chambers there is a separating wall comprising a thermoplastic melt element.
A thermal protection device for overvoltage suppressor which includes spaced contacts mounted in overvoltage suppressor magazines of communication systems.
A bow-type spring and a melt element are arranged with the overvoltage suppressor which is mounted in a chamber of a case body or housing. The melt element is pierced by at least one arm of the bow-type spring when an overvoltage occurs for short-circuiting the two contacts of the overvoltage suppressor. A thermal protection device with simple components prevents creepage currents between the bow-type spring and the contacts of the overvoltage suppressor, a chamber for the overvoltage suppressor is adjacent and abutting to a separate chamber formed in the case body for accommodating a bow-type spring. Between the two chambers there is a separating wall comprising a thermoplastic melt element.
Description
This invention relates in general to communication devices and in particular to an overvoltage suppressor construction and to a thermoprotection device therefore. A similar thermal protection device is known from DE No. 27 38 078 A1. Therein a melt element is formed as a sleeve surrounding the overvoltage suppressor, the sleeve being pierced by the arms of a U-shaped bow-type spring in case of an overvoltage. It is disadvantageous, that the melt element is an additional component, needing, further, to be adapted accurately to the shape of the overvoltage suppressor. Moreover, creepage currents between the arms of the bow-type spring and the contacts of the overvoltage suppressor may occur.
Further, a thermal protection device of a lS different type is known from EP No. 0.040.522 A1, wherein the overvoltage suppressor is not mounted in a chamber of ¦ the case body. Instead, pan-type melt elements are disposed, for accommodating compression springs of an overvoltage, the bottom sections of the pan-type melt elements will melt, and also the springs connecting the yoke-type contact plates to each other. In case of an overvoltage, the bottom sections of the pan-type elements will melt, and the springs connect the yoke-type contact plates to each other. It is disadvantageous, that the pan-type melt elements are additional components.
Further, from the bulletin "Surge Arresters" of the M-O Valve Company Ltd., a thermal protection device of overvoltage suppressor is known. This device is provided with a fixed spring rod held spaced from the overvoltage suppressor by means of a plastic coating. In case of an overvoltage, the plastic coating will melt, whereby the spring rod will short-circuit over the contacts of the overvoltage suppressor. It is disadvantageous that the spring rod is a special component fixed to the overvoltage suppressor, and the overvoltage suppressor cannot be reused after the plastic coating becomes molten.
~. -.. . . .
.. . .
~330826 The invention provides a thermal protection device needing only few and simple components and which prevents creepage currents between a spring member, preferably bow-t~pe and the contacts of the overvoltage suppressor.
According to the invention, the melt element is formed by a separating wall of thermoplastic arranged between two chambers for accommodating the overvoltage suppressor and the spring member. The separating wall is of a simple construction and is an easily replaceable component. By the arrangement of the spring member in the separate chamber, there is, further, a sufficient electrical separation between the spring member and the contacts of the overvoltage suppressor, such that no creepage currents can be formed. Moreover, the overvoltage suppressor can still be used after the occurrence of an overvoltage.
Further advantageous embodiments of the invention result from a one-part design of the separating wall with the base body. There is a possibility to insert the overvoltage suppressor independently from the spring member into the overvoltage suppressor magazine, or to remove it.
Hereby, the time required for mounting the overvoltage suppressor magazines is reduced considerably.
Accordingly, the present invention provides a thermal protection device for an overvoltage suppressor of an overvoltags suppressor magazine, comprising a metal ground plate; an overvoltage suppressor housing having a suppressor chamber, said chamber capable of receiving an overvoltage suppressor having first and second contacts disposed adjacent either end thereof and wherein said ground plate forms one end of said chamber; means defining a spring chamber; thermoplastic wall means separating said spring chamber from said suppressor chamber; conductive spring means positioned in said spring chamber and having first and second arms urged against said thermoplastic wall . . ,~.
:' ',::' :, , . ' !''~
` ' `" ,. , ' ~: ' : , ~ 1330826 means; said thermoplastic wall means comprising a meltable material so that upon melting, said first and second arms of said spring means are urged into contact with said first and second contacts respectively of an overvoltage suppressor disposed in said suppressor chamber, thereby providing electrical connection between the first and second contacts of the overvoltage suppressor.
The present invention further provides a thermo protection device for an overvoltage suppressor which includes a spring element which has a pair of spaced apart arm portions which engage and shortout the contacts of the suppressor when an enclosing wall for this suppressor contact is melted.
The present invention further provides a method of protecting an over voltage suppressor from thermal overload comprising the steps of arranging an overvoltage suppressor having first and second spaced apart contacts in an enclosing wall, wherein said first contact engages a ground element and said second contact is engaged by a -- 20 contact spring; positioning a conductive spring member having first and second contact ends alongside said first and second contacts of the suppressor; separating the conductive spring member first and second contact ends from said first and second contacts of the suppressor by a meltable wall; aligning the conductive spring member with the suppressor contact so that when the wall melts the conductive spring member contact ends will move into engagement with the respective suppressor contacts to provide an electrical connection between the suppressor contacts.
The present invention yet further provides a thermoprotection device for overvoltage suppressors which is simple in design, rugged in construction and economical to manufacture.
The various features of novelty which characterize the invention are pointed out with : -.:,. ~ . - .
. . . -~, . .
`~ ~330826 particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects obtained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
In the drawings:
Figure 1 is a perspective representation of an overvoltage suppressor magazine with a thermal protection device constructed in accordance with the invention; and Figure 2 is a section taken along the line I - I
of Figure 1.
Referring to the drawings in particular the invention embodied therein comprises an apparatus and method for the thermal protection of a voltage suppressor particularly of a communication system with spaced apart contacts 7 and 8 which are maintained in a housing which defines an enclosing wall or separating wall 1. The apparatus also includes a chamber forming member defining ¦,` 20 a chamber 9. A spring member 3, which is advantageously a conductive U-shaped or spring member having arm portions 4 and 5, is aligned with respective contacts 7 and 8. The contacts 7 and 8 are held between a contact spring 15 and a base or ground rail 12. In accordance with the invention the wall 1 is made of material which melts due to thermal overload and permits the arm portions 4 and 5 to come into engagement with the contacts 7 and 8 and shortout a suppressor.
The overvoltage suppressor magazine 11 includes a rectangular case body 13 of thermoplastic and a metal ground rail 12. In the case body 13, one or several chambers 14, which open at the top, are provided for accommodation of overvoltage suppressor 6. Such suppressors 6 are preferably side-by-side in a line. A
chamber 9 is assigned to co-operate with each of the chambers 14 for accommodation of spring member 3. As shown .. :
~330826 in Figures 1 and 2, the inner shape of the chamber 14 is adapted to the shape of the cylindrical overvoltage suppressor 6, the suppressor 6 has spaced apart contacts 7 and 8 adjacent each end face.
The cylindrical chamber 14 is closed on the bottom side by the ground rail 12 extending over the entire bottom surface of the case body 13. This arrangement provides that the contact 7, of the overvoltage suppressor 6 mounted in the chamber 14, is connected electrically with the ground rail 12. At the top side 16 of the case body 13, a contact spring 15, connected to a communication cable, has an inner end which rests against the other contact 8 of the overvoltage suppressor 6. The contact spring 15 presses the overvoltage suppressor 6 with a spring-type action against the ground rail 12, the overvoltage suppressor 6 being, thus, held in a clamping manner in the chamber 14. Adjacent to each chamber 14 there is provided the other rectangular chamber 9 which is open at its top. This chamber, in contrast to chamber 14, is closed at the bottom and has no connection to the ground rail 12. The chambers 9 and 14 are separated from each other by a thin separating wall 1 of thermoplastic of the case body 13.
Into the chamber 9, which is open at one end, is inserted spring member 3 having two arms 4 and 5. The spring member 3 is disposed such that the arms 4 and 5 extend toward the direction of the separating wall 1. The ends of the spring arms 4, 5 are assigned to the contacts 7, 8 of the overvoltage suppressor 6. The spring arms 4, 5 are separated from the contacts 7, 8 by the separating wall 1 only. The spring member 3 is slightly pre-stressed, such that both arms 4 and 5 of the spring member 3 are pressed rectangularly against the separating wall 1.
When an overvoltage occurs, the overcurrent flows over the contact spring 15 to the contact 8 of the overvoltage suppressor 6. Between the one contact 8 and F"~
~''.;" ~ `
i`'.~; ~" ', ~ ' . ' ''~: , ' ': ' ~ ~330826 ~; the other contact 7 of the overvoltage suppressor there is a gas-discharge path, such that an arc will be formed between the contacts 7, 8 of the overvoltage suppressor 6.
As the contact 7 re~ts directly against the ground rail 12, the overcurrent being formed is conducted to earth.
In the case that the overcurrent flows for a longer period of time, the overvoltage suppressor magazine 11 would be destroyed because of the high temperature. In order to prevent this destruction, the other chamber 9 with the spring member 3 is provided adjacent to each chamber 14 accommodating an overvoltage suppressor 6. By the heating of the overvoltage suppressor 6 at high temperatures, the separating wall 1 limiting the two chambers 9, 14 becomes plastic, such that the arms 4,5 of the spring member 3 pressing under spring action against the separating wall l will pierce the wall.
An electrical connection between the spring ,~ member 3 and the overvoltage suppressor 6, is thus, created, because the spring arm 4 impinges upon the contact 8, and the spring arm 5 impinges upon the contact 7 of the voltage suppressor 6. The arc generated in the gas-discharge path of the overvoltage suppressor 6 is, thus, ~; short-circuited by the spring member 3, whereby the overcurrent can flow off directly to earth potential. The separating wall 1 has a minimum thickness of approximately 0.3 mm.
In an embodiment (not shown) the separating wall is formed as a separate part, placed between the two chambers 9 and 14.
While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
t'' , : :
Further, a thermal protection device of a lS different type is known from EP No. 0.040.522 A1, wherein the overvoltage suppressor is not mounted in a chamber of ¦ the case body. Instead, pan-type melt elements are disposed, for accommodating compression springs of an overvoltage, the bottom sections of the pan-type melt elements will melt, and also the springs connecting the yoke-type contact plates to each other. In case of an overvoltage, the bottom sections of the pan-type elements will melt, and the springs connect the yoke-type contact plates to each other. It is disadvantageous, that the pan-type melt elements are additional components.
Further, from the bulletin "Surge Arresters" of the M-O Valve Company Ltd., a thermal protection device of overvoltage suppressor is known. This device is provided with a fixed spring rod held spaced from the overvoltage suppressor by means of a plastic coating. In case of an overvoltage, the plastic coating will melt, whereby the spring rod will short-circuit over the contacts of the overvoltage suppressor. It is disadvantageous that the spring rod is a special component fixed to the overvoltage suppressor, and the overvoltage suppressor cannot be reused after the plastic coating becomes molten.
~. -.. . . .
.. . .
~330826 The invention provides a thermal protection device needing only few and simple components and which prevents creepage currents between a spring member, preferably bow-t~pe and the contacts of the overvoltage suppressor.
According to the invention, the melt element is formed by a separating wall of thermoplastic arranged between two chambers for accommodating the overvoltage suppressor and the spring member. The separating wall is of a simple construction and is an easily replaceable component. By the arrangement of the spring member in the separate chamber, there is, further, a sufficient electrical separation between the spring member and the contacts of the overvoltage suppressor, such that no creepage currents can be formed. Moreover, the overvoltage suppressor can still be used after the occurrence of an overvoltage.
Further advantageous embodiments of the invention result from a one-part design of the separating wall with the base body. There is a possibility to insert the overvoltage suppressor independently from the spring member into the overvoltage suppressor magazine, or to remove it.
Hereby, the time required for mounting the overvoltage suppressor magazines is reduced considerably.
Accordingly, the present invention provides a thermal protection device for an overvoltage suppressor of an overvoltags suppressor magazine, comprising a metal ground plate; an overvoltage suppressor housing having a suppressor chamber, said chamber capable of receiving an overvoltage suppressor having first and second contacts disposed adjacent either end thereof and wherein said ground plate forms one end of said chamber; means defining a spring chamber; thermoplastic wall means separating said spring chamber from said suppressor chamber; conductive spring means positioned in said spring chamber and having first and second arms urged against said thermoplastic wall . . ,~.
:' ',::' :, , . ' !''~
` ' `" ,. , ' ~: ' : , ~ 1330826 means; said thermoplastic wall means comprising a meltable material so that upon melting, said first and second arms of said spring means are urged into contact with said first and second contacts respectively of an overvoltage suppressor disposed in said suppressor chamber, thereby providing electrical connection between the first and second contacts of the overvoltage suppressor.
The present invention further provides a thermo protection device for an overvoltage suppressor which includes a spring element which has a pair of spaced apart arm portions which engage and shortout the contacts of the suppressor when an enclosing wall for this suppressor contact is melted.
The present invention further provides a method of protecting an over voltage suppressor from thermal overload comprising the steps of arranging an overvoltage suppressor having first and second spaced apart contacts in an enclosing wall, wherein said first contact engages a ground element and said second contact is engaged by a -- 20 contact spring; positioning a conductive spring member having first and second contact ends alongside said first and second contacts of the suppressor; separating the conductive spring member first and second contact ends from said first and second contacts of the suppressor by a meltable wall; aligning the conductive spring member with the suppressor contact so that when the wall melts the conductive spring member contact ends will move into engagement with the respective suppressor contacts to provide an electrical connection between the suppressor contacts.
The present invention yet further provides a thermoprotection device for overvoltage suppressors which is simple in design, rugged in construction and economical to manufacture.
The various features of novelty which characterize the invention are pointed out with : -.:,. ~ . - .
. . . -~, . .
`~ ~330826 particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects obtained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
In the drawings:
Figure 1 is a perspective representation of an overvoltage suppressor magazine with a thermal protection device constructed in accordance with the invention; and Figure 2 is a section taken along the line I - I
of Figure 1.
Referring to the drawings in particular the invention embodied therein comprises an apparatus and method for the thermal protection of a voltage suppressor particularly of a communication system with spaced apart contacts 7 and 8 which are maintained in a housing which defines an enclosing wall or separating wall 1. The apparatus also includes a chamber forming member defining ¦,` 20 a chamber 9. A spring member 3, which is advantageously a conductive U-shaped or spring member having arm portions 4 and 5, is aligned with respective contacts 7 and 8. The contacts 7 and 8 are held between a contact spring 15 and a base or ground rail 12. In accordance with the invention the wall 1 is made of material which melts due to thermal overload and permits the arm portions 4 and 5 to come into engagement with the contacts 7 and 8 and shortout a suppressor.
The overvoltage suppressor magazine 11 includes a rectangular case body 13 of thermoplastic and a metal ground rail 12. In the case body 13, one or several chambers 14, which open at the top, are provided for accommodation of overvoltage suppressor 6. Such suppressors 6 are preferably side-by-side in a line. A
chamber 9 is assigned to co-operate with each of the chambers 14 for accommodation of spring member 3. As shown .. :
~330826 in Figures 1 and 2, the inner shape of the chamber 14 is adapted to the shape of the cylindrical overvoltage suppressor 6, the suppressor 6 has spaced apart contacts 7 and 8 adjacent each end face.
The cylindrical chamber 14 is closed on the bottom side by the ground rail 12 extending over the entire bottom surface of the case body 13. This arrangement provides that the contact 7, of the overvoltage suppressor 6 mounted in the chamber 14, is connected electrically with the ground rail 12. At the top side 16 of the case body 13, a contact spring 15, connected to a communication cable, has an inner end which rests against the other contact 8 of the overvoltage suppressor 6. The contact spring 15 presses the overvoltage suppressor 6 with a spring-type action against the ground rail 12, the overvoltage suppressor 6 being, thus, held in a clamping manner in the chamber 14. Adjacent to each chamber 14 there is provided the other rectangular chamber 9 which is open at its top. This chamber, in contrast to chamber 14, is closed at the bottom and has no connection to the ground rail 12. The chambers 9 and 14 are separated from each other by a thin separating wall 1 of thermoplastic of the case body 13.
Into the chamber 9, which is open at one end, is inserted spring member 3 having two arms 4 and 5. The spring member 3 is disposed such that the arms 4 and 5 extend toward the direction of the separating wall 1. The ends of the spring arms 4, 5 are assigned to the contacts 7, 8 of the overvoltage suppressor 6. The spring arms 4, 5 are separated from the contacts 7, 8 by the separating wall 1 only. The spring member 3 is slightly pre-stressed, such that both arms 4 and 5 of the spring member 3 are pressed rectangularly against the separating wall 1.
When an overvoltage occurs, the overcurrent flows over the contact spring 15 to the contact 8 of the overvoltage suppressor 6. Between the one contact 8 and F"~
~''.;" ~ `
i`'.~; ~" ', ~ ' . ' ''~: , ' ': ' ~ ~330826 ~; the other contact 7 of the overvoltage suppressor there is a gas-discharge path, such that an arc will be formed between the contacts 7, 8 of the overvoltage suppressor 6.
As the contact 7 re~ts directly against the ground rail 12, the overcurrent being formed is conducted to earth.
In the case that the overcurrent flows for a longer period of time, the overvoltage suppressor magazine 11 would be destroyed because of the high temperature. In order to prevent this destruction, the other chamber 9 with the spring member 3 is provided adjacent to each chamber 14 accommodating an overvoltage suppressor 6. By the heating of the overvoltage suppressor 6 at high temperatures, the separating wall 1 limiting the two chambers 9, 14 becomes plastic, such that the arms 4,5 of the spring member 3 pressing under spring action against the separating wall l will pierce the wall.
An electrical connection between the spring ,~ member 3 and the overvoltage suppressor 6, is thus, created, because the spring arm 4 impinges upon the contact 8, and the spring arm 5 impinges upon the contact 7 of the voltage suppressor 6. The arc generated in the gas-discharge path of the overvoltage suppressor 6 is, thus, ~; short-circuited by the spring member 3, whereby the overcurrent can flow off directly to earth potential. The separating wall 1 has a minimum thickness of approximately 0.3 mm.
In an embodiment (not shown) the separating wall is formed as a separate part, placed between the two chambers 9 and 14.
While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.
t'' , : :
Claims (9)
1. A thermal protection device for an overvoltage suppressor of an overvoltage suppressor magazine, comprising:
a metal ground plate;
an overvoltage suppressor housing having a suppressor chamber, said chamber capable of receiving an overvoltage suppressor having first and second contacts disposed adjacent either end thereof and wherein said ground plate forms one end of said chamber;
means defining a spring chamber;
thermoplastic wall means separating said spring chamber from said suppressor chamber; and conductive spring means positioned in said spring chamber and having first and second arms urged against said thermoplastic wall means;
said thermoplastic wall means comprising a meltable material so that upon melting, said first and second arms of said spring means are urged into contact with said first and second contacts respectively, of an overvoltage suppressor disposed in said suppressor chamber, thereby providing electrical connection between said first and second contacts of the overvoltage suppressor.
a metal ground plate;
an overvoltage suppressor housing having a suppressor chamber, said chamber capable of receiving an overvoltage suppressor having first and second contacts disposed adjacent either end thereof and wherein said ground plate forms one end of said chamber;
means defining a spring chamber;
thermoplastic wall means separating said spring chamber from said suppressor chamber; and conductive spring means positioned in said spring chamber and having first and second arms urged against said thermoplastic wall means;
said thermoplastic wall means comprising a meltable material so that upon melting, said first and second arms of said spring means are urged into contact with said first and second contacts respectively, of an overvoltage suppressor disposed in said suppressor chamber, thereby providing electrical connection between said first and second contacts of the overvoltage suppressor.
2. A thermal protection device according to claim 1, wherein said thermoplastic wall means has a minimum wall thickness of approximately 0.3 mm.
3. A thermal protection device according to claim 1, wherein said thermoplastic wall means is formed as an integral part of said case body, said enclosing wall forming a magazine holding said contacts.
4. A method of protecting an over voltage suppressor from thermal overload comprising the steps of:
arranging an overvoltage suppressor having first and second spaced apart contacts in an enclosing wall, wherein said first contact engages a ground element and said second contact is engaged by a contact spring;
positioning a conductive spring member having first and second contact arms alongside said first and second contacts of the suppressor;
separating the conductive spring member first and second contact arms from said first and second contacts of the suppressor by a meltable wall;
aligning the conductive spring member with the suppressor contact so that when the wall melts the conductive spring member contact arms will move into engagement with the respective suppressor contacts to provide an electrical connection between the suppressor contacts.
arranging an overvoltage suppressor having first and second spaced apart contacts in an enclosing wall, wherein said first contact engages a ground element and said second contact is engaged by a contact spring;
positioning a conductive spring member having first and second contact arms alongside said first and second contacts of the suppressor;
separating the conductive spring member first and second contact arms from said first and second contacts of the suppressor by a meltable wall;
aligning the conductive spring member with the suppressor contact so that when the wall melts the conductive spring member contact arms will move into engagement with the respective suppressor contacts to provide an electrical connection between the suppressor contacts.
5. A thermal protection device for an overvoltage suppressor of an overvoltage suppressor magazine for communication systems, comprising:
means defining a suppressor chamber adapted to receive an overvoltage suppressor therein, the overvoltage suppressor having a first contact element and a second contact element disposed at either end thereof;
a ground plate member forming one end of said suppressor chamber such that a first suppressor contact element will be in conductive contact therewith;
an electrical contact adapted to electrically engage the second suppressor contact member and urge the suppressor into said chamber;
means defining an additional chamber positioned adjacent said suppressor chamber including thermoplastic wall means dividing said suppressor chamber and said additional chamber, said thermoplastic wall means melting and becoming plastic upon being heated;
conductive spring means having a first contact arm and a second contact arm, said spring means being positioned in said additional chamber with said first contact arm aligned with said first suppressor contact element and said second contact arm aligned with said second suppressor contact element, each of said first and second contact arms being biased into engagement with said thermoplastic wall means by said spring means and penetrating said thermoplastic wall means upon the melting thereof.
means defining a suppressor chamber adapted to receive an overvoltage suppressor therein, the overvoltage suppressor having a first contact element and a second contact element disposed at either end thereof;
a ground plate member forming one end of said suppressor chamber such that a first suppressor contact element will be in conductive contact therewith;
an electrical contact adapted to electrically engage the second suppressor contact member and urge the suppressor into said chamber;
means defining an additional chamber positioned adjacent said suppressor chamber including thermoplastic wall means dividing said suppressor chamber and said additional chamber, said thermoplastic wall means melting and becoming plastic upon being heated;
conductive spring means having a first contact arm and a second contact arm, said spring means being positioned in said additional chamber with said first contact arm aligned with said first suppressor contact element and said second contact arm aligned with said second suppressor contact element, each of said first and second contact arms being biased into engagement with said thermoplastic wall means by said spring means and penetrating said thermoplastic wall means upon the melting thereof.
6. A thermal protection device according to claim 5, wherein said thermoplastic wall means has a minimum wall thickness of approximately 0.3 mm.
7. A thermal protection device according to claim 5, wherein said thermoplastic wall means is formed integral with each of said means defining a suppressor chamber and means defining an additional chamber.
8. A thermal protection device according to claim 1 or 5, wherein said spring means is selected from the group comprising bow-type and U-shaped springs.
9.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3735837.5 | 1987-10-20 | ||
| DE3735837 | 1987-10-20 | ||
| DE3820272A DE3820272C1 (en) | 1987-10-20 | 1988-06-10 | |
| DEP3820272.7 | 1988-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1330826C true CA1330826C (en) | 1994-07-19 |
Family
ID=25861018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000578079A Expired - Fee Related CA1330826C (en) | 1987-10-20 | 1988-09-21 | Surge suppresor with insulating meltable wall and leaf springs for overcurrent shorting |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US4887183A (en) |
| EP (1) | EP0312729B1 (en) |
| JP (1) | JPH01109626A (en) |
| CN (1) | CN1012867B (en) |
| AR (1) | AR241296A1 (en) |
| AT (1) | ATE69126T1 (en) |
| AU (1) | AU606223B2 (en) |
| BR (1) | BR8805396A (en) |
| CA (1) | CA1330826C (en) |
| DE (2) | DE3820272C1 (en) |
| ES (1) | ES2026980T3 (en) |
| GR (1) | GR3003039T3 (en) |
| HK (1) | HK84092A (en) |
| IN (1) | IN169696B (en) |
| MX (1) | MX164630B (en) |
| RU (1) | RU2024136C1 (en) |
| YU (1) | YU47295B (en) |
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| DE19708651A1 (en) * | 1997-02-21 | 1998-09-03 | Siemens Ag | Gas-filled surge arrester with external short-circuit device |
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| DE102007051854B4 (en) * | 2006-11-09 | 2017-05-04 | Dehn + Söhne Gmbh + Co. Kg | Surge arrester with a housing and with at least one discharge element |
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| FR2958787B1 (en) * | 2010-04-09 | 2012-05-11 | Abb France | DEVICE FOR PROTECTION AGAINST OVERVOLTAGES WITH DEDUCTIVE THERMAL DISCONNECTORS |
| FR2958789B1 (en) * | 2010-04-09 | 2012-05-11 | Abb France | DEVICE FOR PROTECTION AGAINST TRANSIENT OVERVOLTAGES WITH IMPROVED THERMAL DISCONNECTOR |
| DE102010036909B3 (en) * | 2010-08-06 | 2012-02-16 | Phoenix Contact Gmbh & Co. Kg | Thermal overload protection device |
| US8810988B2 (en) | 2011-11-04 | 2014-08-19 | Mersen Usa Newburyport-Ma, Llc | Circuit protection device |
| US8477468B2 (en) | 2011-11-04 | 2013-07-02 | Mersen Usa Newburyport-Ma, Llc | Circuit protection device |
| SI2677524T1 (en) * | 2012-06-19 | 2018-12-31 | Raycap Intellectual Property, Ltd. | Overvoltage protection devices including a varistor member and an electrical conductive fusing member |
| CN103986140A (en) * | 2014-05-09 | 2014-08-13 | 广西南宁百兰斯科技开发有限公司 | Inserting piece type anti-thunder device |
| US9520709B2 (en) | 2014-10-15 | 2016-12-13 | Schneider Electric USA, Inc. | Surge protection device having two part ceramic case for metal oxide varistor with isolated thermal cut off |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4034326A (en) * | 1975-04-17 | 1977-07-05 | Comtelco (U.K.) Limited | Temperature sensitive trip device |
| US4056840A (en) * | 1976-05-12 | 1977-11-01 | Reliable Electric Company | Line protector for communications circuit |
| US4212047A (en) * | 1976-08-31 | 1980-07-08 | Tii Corporation | Fail-safe/surge arrester systems |
| DE2911110A1 (en) * | 1979-03-21 | 1980-09-25 | Siemens Ag | GAS DISCHARGE SURGE PROTECTOR WITH FAIL SAFE BEHAVIOR |
| DE2911109C3 (en) * | 1979-03-21 | 1982-03-04 | Siemens AG, 1000 Berlin und 8000 München | Surge arrester for several lines to be fused together |
| US4233641A (en) * | 1979-04-06 | 1980-11-11 | Reliable Electric Company | Line protector for a communications circuit |
| US4371911A (en) * | 1980-05-16 | 1983-02-01 | The M-O Valve Company Limited | Excess voltage arresters |
| US4402031A (en) * | 1981-12-07 | 1983-08-30 | Porta Systems Corp. | Gas tube protector module |
| US4449156A (en) * | 1982-09-24 | 1984-05-15 | Porta Systems Corp. | Telephone central office gas tube replacement protector |
| GB8332514D0 (en) * | 1983-12-06 | 1984-01-11 | Beswick Kenneth E Ltd | Electrical components |
| DE3410610A1 (en) * | 1984-03-22 | 1985-09-26 | Siemens AG, 1000 Berlin und 8000 München | Fuse element for lines used in electrical telecommunications technology |
| GB2170352B (en) * | 1984-10-24 | 1988-05-25 | Dubilier Plc | Temperature responsive switch |
| DE3604785A1 (en) * | 1986-02-13 | 1987-08-20 | Siemens Ag | METAL-ENCLOSED, GAS-INSULATED HIGH-VOLTAGE SYSTEM WITH AN OVERVOLTAGE ARRESTER |
-
1988
- 1988-06-10 DE DE3820272A patent/DE3820272C1/de not_active Expired
- 1988-08-13 DE DE8888113259T patent/DE3865943D1/en not_active Expired - Fee Related
- 1988-08-13 EP EP88113259A patent/EP0312729B1/en not_active Expired - Lifetime
- 1988-08-13 AT AT88113259T patent/ATE69126T1/en not_active IP Right Cessation
- 1988-08-13 ES ES198888113259T patent/ES2026980T3/en not_active Expired - Lifetime
- 1988-08-30 IN IN725/CAL/88A patent/IN169696B/en unknown
- 1988-09-06 JP JP63221493A patent/JPH01109626A/en active Granted
- 1988-09-21 CA CA000578079A patent/CA1330826C/en not_active Expired - Fee Related
- 1988-09-28 RU SU884356552A patent/RU2024136C1/en active
- 1988-10-13 US US07/257,388 patent/US4887183A/en not_active Expired - Fee Related
- 1988-10-17 AR AR88312217A patent/AR241296A1/en active
- 1988-10-19 MX MX13472A patent/MX164630B/en unknown
- 1988-10-19 BR BR8805396A patent/BR8805396A/en not_active IP Right Cessation
- 1988-10-19 YU YU195888A patent/YU47295B/en unknown
- 1988-10-20 AU AU24097/88A patent/AU606223B2/en not_active Ceased
- 1988-10-20 CN CN88107348A patent/CN1012867B/en not_active Expired
-
1991
- 1991-10-31 GR GR91401505T patent/GR3003039T3/en unknown
-
1992
- 1992-10-29 HK HK840/92A patent/HK84092A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US4887183A (en) | 1989-12-12 |
| EP0312729A1 (en) | 1989-04-26 |
| AU2409788A (en) | 1989-04-20 |
| HK84092A (en) | 1992-11-06 |
| GR3003039T3 (en) | 1993-02-17 |
| DE3865943D1 (en) | 1991-12-05 |
| JPH01109626A (en) | 1989-04-26 |
| MX164630B (en) | 1992-09-10 |
| CN1012867B (en) | 1991-06-12 |
| ES2026980T3 (en) | 1992-05-16 |
| YU47295B (en) | 1995-01-31 |
| IN169696B (en) | 1991-12-07 |
| JPH0576125B2 (en) | 1993-10-22 |
| CN1032716A (en) | 1989-05-03 |
| DE3820272C1 (en) | 1989-04-06 |
| YU195888A (en) | 1991-06-30 |
| AR241296A1 (en) | 1992-04-30 |
| RU2024136C1 (en) | 1994-11-30 |
| ATE69126T1 (en) | 1991-11-15 |
| BR8805396A (en) | 1989-06-20 |
| AU606223B2 (en) | 1991-01-31 |
| EP0312729B1 (en) | 1991-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |