CN100588068C - Telecom circuit protection apparatus - Google Patents
Telecom circuit protection apparatus Download PDFInfo
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- CN100588068C CN100588068C CN200480015605A CN200480015605A CN100588068C CN 100588068 C CN100588068 C CN 100588068C CN 200480015605 A CN200480015605 A CN 200480015605A CN 200480015605 A CN200480015605 A CN 200480015605A CN 100588068 C CN100588068 C CN 100588068C
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- temperature response
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Abstract
A telecom circuit protection apparatus includes a housing having at least first and second temperature responsive circuit protection devices, such as a fuse and a thyristor disposed therein. A first metal lead is connected to respective first terminals of the first and second circuit protection devices and is structured and arranged such as to transfer heat freely between the second circuit protection device and the first circuit protection device. A second metal lead is connected to a second terminal of the first device and a third metal lead is connected to a second terminal of the second device. The first, second and third metal leads extend from the housing. Advantageously, the portions of the first, second and third metal leads extending from the housing have reduced cross-sections toreduce heat loss from the apparatus and are formed and made solderable for use as connection points for surface mount connection to the apparatus. To protect multiple service lines, a circuit protector is provided for each of them. In this case, the multiple circuit protectors may advantageously be collocated in a common housing having either a common or separate ground terminal(s).
Description
The mutual reference of pertinent literature
It is 60/476 that the application requires to enjoy the U.S. Provisional Application sequence number of submitting on June 4th, 2003; 051 title is the priority and the rights and interests thereof of " can improve the thermal property (linking component ' s thermal properties toimprove telecom protection circuit responses to lightening surge and powercross faults) of telecommunications protective circuit to the coupling assembling of lightning surge and power cross faults response ", at this in conjunction with its all the elements as a reference.
Technical field
The present invention relates to circuit protection device, and relate in particular to the protection telecommunication apparatus away from the multiple abnormal morphology and the telecommunications protective device of potential dangerous circuit incident such as lightning surge and power cross for example, protection is not at the application of the opposite layout strategy of indication.
Background technology
Management organization requires the direct-connected telecommunication apparatus use of great majority and service provider's outside line safeguard measure to appear in the face of in the incident of unusual circuit to prevent bust or fire, and for example the line that is not intended to of lightning surge or band high voltage power stream (power cross) contacts.A kind of equipment that typically is used for identifies that the management method of (for example proposing at Telcordia GR 1089) is to make device bear a series of overload emulation typical case who clearly defines unusually, and the test of these regulations is divided into two kinds of intensity; Those protection equipment must be idle can damage survive possible breakdown is only otherwise have fire or danger under abnormal conditions with those.
For solving lightning surge and power cross faults with define balance between two kinds of inconsistent methods of line design protective circuit requirement between survival and controlled failure of distinguishing by this.Instantaneous lightning is the short-term high-energy incident that can cause the very high electric current puncture under several kilovolts.The power cross time usually comprises and carries 600 volts or lower interchange feedback contact and the energy long-term existence.A kind of solution that typically is used to protect these various faults of defence comprises that inserting " anti-temporarily " fuse or PTC (positive temperature coefficient) device is placed between the equipment side and earth point of each fuse/PTC with connect also same thyristor or other voltage clamp device of of service line or two stream electric wires (referring generally to be decided to be " tip " and " ring end "), thereby the quick response means of a kind of strangulation overvoltage in lsafety level is provided.There is multiple circuit arrangement, but one or more temporary refractory silk/PTC are arranged in each protection scheme of basic demand.
In order to be suitable for the application, fuse/PTC device must the imperforation conduction instantaneous high peak current extremely relevant voltage clamp device relevant with lightning surge.This means that fuse element should have sufficiently high I2t (allow energy by) and cause the equipment fault do not expected when its opening is subjected to " acceptable " surge level to get rid of.Yet, when being subjected to the low-level over current fault of government definition fuse also must be in a relevant short circuit special time enough responses to opening.Meet this second specified electric current that allows that requires to define fuse, reduce its roughly I2t of fuse element piece number in proportion to.These inconsistent demand strictnesses have limited the design parameter of fuse.
Summary of the invention
The heat that one of purpose of the present invention is advantageously to utilize under certain fault condition the voltage clamping assembly of circuit protection device to produce.Especially; one of purpose of the present invention is that materials used characteristic, thermodynamic principles and placement geometry significantly strengthen the protective value that surpasses prior art; when equipment is subjected to lightning surge within the inhibition ability of its related voltage clamping device; by allowing to use stronger device for fusing better to resist bad error (undesirable clearing), adjust limiting value but surpass.Because each side of the present invention, when suffering low current, power cross test situation, fuse also remains on the opening capacity of adjusting in the time restriction.
Another object of the present invention is to maximize the packaging density of necessary protective circuit assembly, need increase trustship and protect the board area of communication equipment (realestate) so that install favourable minimizing.
Another object of the present invention is to reduce the assembly cost of communication equipment; by a protection solution pattern is provided to equipment manufacture; with " mounted on surface " manufacturing technology compatibility, and use " select and place " device in one-period, to be arranged on the circuit board automatically.
These and other objects of the present invention are realized that by a circuit protection device it comprises the housing with at least the first and second temperature response circuit protection devices, and for example a fuse and a thyristor place in it, are used for every protection service circuit.One first metal lead wire is connected to first and second circuit protection devices the first terminal separately, and is configured and is arranged to from the second circuit protective device and transfer heat to first circuit protection device.One second metal lead wire is connected to second terminal of first device; One the 3rd metal lead wire is connected to second terminal of second device; first, second and the 3rd metal lead wire stretch out in shell; the first metal lead wire pre-connection is to protective device, the point electrical ground that the second metal lead wire pre-connection matches to communication line and the 3rd metal lead wire pre-connection to.
With reference to the respective drawings other features and advantages of the present invention will be more obvious in the following description.
Description of drawings
Fig. 1 is the section partial elevation view of a telecommunication circuit protector embodiment of the present invention, has for clarity sake removed a part, illustrates some feature of the present invention.
Fig. 2 is the section partial side view of the telecommunication circuit protector of Fig. 1.
Fig. 3 is the front view that the interval of the telecommunication circuit protector of Fig. 1 and Fig. 2 forms part.
Fig. 4 is the end view that lead-in wire that the telecommunication circuit protector of Fig. 1 and Fig. 2 is shown forms the relaxed of part.
Fig. 5 illustrates the top view that the terminal of the telecommunications protector of Fig. 1 and Fig. 2 is arranged.
Fig. 6 is the electrical schematics of the telecommunication circuit protector of Fig. 1 and Fig. 2.
Fig. 7 illustrates the top view that the terminal of interconnection telecommunications protector among the optional embodiment of Fig. 1 and Fig. 2 is arranged.
Fig. 8 is the electrical schematics of telecommunication circuit protector among the optional embodiment.
Embodiment
All electric components all discharge certain heat when using.When using fuse or PTC, this heat is fatal to its normal function and is focus of the present invention.When enough electric currents connect by fuse or during PTC, can overcome from it by the heat of interior generation and to connect the loss around it of terminal and its surface, and its component temperature can reach its fusion/high resistance point, open this fuse or drive this PTC to its threshold currents pattern.
Semiconductor device, thyristor for example, also release heat when its conducting.The power that consumes is its anterior pressure drop and the product that passes through its electric current.The heat that great majority produce dissipates via the plumb joint of device, and small part maintains its surface.Be different from fuse, excessive temperature is soaring can to weaken semi-conductive normal function.The temperature of device junction must maintain the maximum that is lower than its regulation of dispatching from the factory.According to the present invention, by physical location and thermodynamics, the thermal property of these two electric connecting devices is combined to influence symbiosis, can make device have the protective feature that significantly improves above prior art.
Fig. 1-4 illustrates a kind of exemplary embodiments of telecom circuit protection apparatus, so that some feature of the present invention to be described.This embodiment illustrates the protective device of two wires of the service line that is used to deliver to telecommunication installation, comprises fuse of anti-surge the (F) and voltage clamp device, as thyristor (T), as the temperature response circuit protection device that is used for every electric wire.Yet should recognize,, only may adopt embodiment with a fuse and a thyristor if having only an electric wire of service line to need protection.On the contrary, when needing protection, may use to surpass two fuses and two thyristors more than a service line.In this case, the protector of many circuits may be connected on a shared grounding end, or is loaded on ground termination points separately.
Each fuse of anti-surge the (F) is vertically placed, thereby its low lead-in wire (LL) that covers via a little cross section is connected to reduce thermal losses with the main circuit board (B) of protection equipment.The interior heat that helps like this to produce under the failure condition moves to the top of fuse and produces favourable temperature gradient by convection current.The top of every fuse closely connects a thyristor (T) in vertical direction, by in the top and the mode that goes up welding between the top of fuse, and rely on its useful thickness of adjustment (S) distance piece (the best shown in Figure 3) of an insulating heat-conductive, print a conductive plate that can weld (K) on it, make it to be positioned between the wall of its low side and fuse (F).
Wide bonding jumper is installed to as lead-in wire (L) on the top of every fuse (F) and with the top and is connected, and the top lead-in wire of thyristor (T) is connected to this fuse (F) and generation high-temperature soldering with scolder.Every lead-in wire (L) folds down nearly 80 degree, and forms as follows: just surpassing the point (J) of semiconductor joint against the thin top of thyristor in its bottom during to bias internal.During the every lead-in wire (L) of the flat spring effect of playing of making by the electrically conductive elastic deformable metal,, locate to form a hot link closely at (J) like this by the pressure preload that exit point (W) is located when packing into.Fig. 4 illustrates lead-in wire (L) in its relaxed shape.Although illustrated hot link is actually machinery, should be noted that interface (facilitator) has high thermal conductivity, heat sink compound for example may be applied to (J) and sentence provide more effective hot approach between pushing up on the joint of thyristor and fuse.The hot polymerization collection of wide (L) makes it play effect as the temporary transient fin of thyristor joint, therefore help extending the time that needs drive the connector temperature of dingus, under failure condition above the maximum of its permission.The bottom that makes every lead-in wire (L) is little cross section and forms in the following manner: it is as being electrically connected, the heat conduction that is reduced to the there simultaneously, with the equipment side circuit that joint between top and the coupled thyristor (T) is connected to main circuit board (B) of going up of coupled fuse (F).This generation type may be " gull wing (gull wing) ", " J lead-in wire ", or some other help device is linked the shape of circuit board (B).
The low lead-in wire of thyristor (T) is linked a conductive, printed pattern (K) on insulation gap spare (S) with high-temperature solder, and promptly preface is successively, is electrically connected to earth point on the main circuit board (B) via the following lead-in wire (G) of a little cross section of tool.Like this, although printed panel (K) only passes through a lead-in wire, two thyristors all are connected to earth point.A shell (C) has the flat top portion surface around total, to reduce the being passed to heat of surrounding environment and to be that automatic " select and place " protective device provides favourable means in a placement cycle.
Naturally, lead-in wire (L), (LL) and (G) respectively at terminal 1,3, the termination of 4,6 and 5 places, as shown in Figure 5.Intuitively, terminal 3 and 4 can be represented the input and output side of telecommunications protective device with " most advanced and sophisticated (TIP) ", and terminal 1 and 6 can be used " ring (RING) " expression input and output side.
As shown in Figure 6, fuse, thyristor and lead-in wire are electrically connected mutually.Under the normal running situation, flow through the signal code of fuse suitable be lower than it can capacity, and the thyristor that links to each other when overvoltage not occurring remains on not on-state.The heat that produces in the fuse under this situation will be easily consumes by connecting this equipment to the lead-in wire of main circuit board.
When requiring to be used for the electric insulation earth point of each electric wire; use the place of this circuit brake to be desirable to provide the connection of independent ground connection; may be separated this printed panel (K) and provide thyristor independent following lead-in wire (G) by advantageously going up by one of thyristor and the influence of another electric insulation like this at distance piece (S).Physical location and Fig. 8 that Fig. 7 illustrates this embodiment terminal are its electrical schematics.
During low current, power cross line fault (for example 2.2 amperes), the temperature of fuse element rises overtime (as previously mentioned) up to zero clearing.With common comparing, provide five kinds of mechanical devices to quicken this temperature increase, similar electrical protection circuit is made of discrete elements.
First kind of mechanical device is the increase in thermal insulation, connected by the lead-in wire with little cross-sectional area to obtain, rather than it goes up the hot polymerization collection acquisition that is produced by a main circuit board or special circuit layer to the liner of corresponding size by the single surface mount component of welding.
Finish main heat to second kind of mechanical device metallicity and disseminate the path, from the joint of thyristor (T) via its inner lead link structure that connects, to its fuse (F) that links to each other go up the top and therefore unhinderedly to the top of its (F) inner member that links to each other.This complete metal path guarantees that heat transmission is maximized.
The third mechanical device is by concentrating on the top that links to each other fuse (F) with the approximate additional heat that end face at thyristor (T) shell is occurred of wide bonding jumper, and carry the strong pressure on top of the shell of relative thyristor (T), and be soldered to the lead-in wire of going up that fuse (F) is gone up the combined block on top and thyristor (T).This heat conduction connects distance piece (S) and finishes miscellaneous function by the top that the heat that will occur at the low terminal of thyristor (T) directly is sent to continuous fuse (F) main body simultaneously.
The 4th kind of mechanical device can be installed fuse (F) on a vertical plane, thereby the high hot polymerization collection that thermal convection in fuse (F) main body and fuse (F) upper top occur impels interior heat to produce moving towards fuse (F) top.Equipment during use on protective device should be installed by vertically-guided; thereby flatly determine the direction of fuse; aforementioned thermal convection effect is with invalid; but favourable temperature gradient is provided by the heat of aggregation piece of the metal that is welded to the last top of fuse (F); even fuse (F) on horizontal plane, also will continue to absorb heat.
At last, cross any one heater circuit by blocking air flow stream, the existence of shell (C) provides more hot confining force.In addition, the size of shell like this design and should will take printed circuit board (PCB) in zone so-called " real attitude " so that the minimized height of circuit brake.The size of shell designs like this, in the time of in device is integrated in shell, makes relatively its thyristor (T) that links to each other every lead-in wire (L) that curves inwardly of its low edge, guarantees hot link closely with this.
Generally speaking, these thermal management mechanisms shown in can reduce typical fuse number of purge at low over-current level by being raised to 70%.Under minimum power cross-beta condition this quickens to remove the fuse that allows to use more appropriate ratio, and it has higher I2t energy and allows to pass through capacity.Like this; when protective device bears high electric current/sustained short-circuit, provide survivability successively, as the pulse of thunderbolt surge above prior art; cause protecting solution to have response characteristic, it surpasses the adjustment KB required under two kinds of failure conditions that are used for two kinds of strict testing levels.
When meeting with sustained short-circuit, high peak current fault conditions is recessed heat when the additional heat that provides by going between under wide accumulates in instantaneous thing, and by its following junction and main circuit board that dwindles it is discharged subsequently from thyristor (T) joint.In addition, the main body of fuse (F) cushions as heat in this case, allows itself and metal lead-in wire and distance piece (S) cooperation down, and soaring with the temperature that weakens in the continuous thyristor (T), indivedual hot polymerization collection of the thyristor (T) that links to each other are low.Under the fault of this form, go up the signal portion of the impact energy that consumes the injection circuit input at thyristor (T).Because its junction of improper heat radiation should be overheated, fault may produce, and makes this protective device can't operate or be subject to the attack of concurrent lightning.The present invention assembles most of heats of single protective circuit, and they are closely cooperated, like this when this " instantaneous soon " thing their homogeneous response to suppress semi-conductive maximum temperature.
Prior art designs common limiting protecting circuit solution; comprise that discrete, continuous placing element is on the main printed circuit board of device; the circuit that requires with connecting pin similar be placed on little, " standard-sized " circuit card or layer on; the matching requirements hand that is designed to SIP (single embedded bag) inserts, and " passing through the hole " type is installed.As a comparison, telecommunications protective device described herein, according to some feature of the present invention, the easiest DIP (dual embedded bag) that is made as makes its easy and standard, " mounted on surface ", " select and place " and " infrared reflow " solder technology compatibility.This compatibility allows SMT (surface mounting technology) protective circuit in installation requirement minimum plate space, and the placement cycle causes significant loss balancing and circuit board " real attitude " compensation separately.
Although the present invention is described with reference to its specific embodiments, other variation and change and other application are conspicuous more for a person skilled in the art.For example, can adopt multi-form voltage clamp element, and PTC can be used to replace fuse.Other physiques also can be used to arrange the protective circuit assembly, to obtain the favourable thermal interaction of expectation, produce a kind of protective circuit response that surmounts the raising of prior art like this.Further, as note, can in a public shell, dispose a plurality of line circuit protectors.In this case, pass them by extending the connection distance piece, the public common ground terminal of a plurality of circuit brakes possibilities, or each can have the earth terminal of oneself.It is therefore preferable that the present invention is not limited in its accurate disclosed content, and only be defined by the claims.
Claims (20)
1, a kind of telecom circuit protection apparatus comprises:
One housing;
Place at least one first temperature response circuit protection device in the described housing;
At least one second temperature response circuit protection device that places in the described housing;
One first metal lead wire, it is connected to first and second temperature response circuit protection devices the first terminal separately, and is constructed and arranged to transfer heat to another temperature response circuit protection device from a temperature response circuit protection device;
One second metal lead wire, it is connected to second terminal of the described first temperature response circuit protection device; And
One the 3rd metal lead wire; it is connected to second terminal of the second temperature response circuit protection device; first, second and the 3rd metal lead wire extend from described housing; wherein first metal lead wire is placed on above the first and second temperature response circuit protection devices; and be connected to first and second temperature response circuit protection devices the first terminal separately, first metal lead wire is arranged to it and connects to form heat conduction against the first temperature response circuit protection device.
2, telecom circuit protection apparatus as claimed in claim 1, wherein the first temperature response circuit protection device is a fuse.
3, telecom circuit protection apparatus as claimed in claim 2, wherein this fuse is a fuse of anti-the surge.
4, telecom circuit protection apparatus as claimed in claim 1, wherein the first temperature response circuit protection device is a positive temperature coefficient protector.
5, telecom circuit protection apparatus as claimed in claim 1, wherein the second temperature response circuit protection device is a voltage clamp device.
6, telecom circuit protection apparatus as claimed in claim 5, wherein this voltage clamp device is a thyristor.
7, telecom circuit protection apparatus as claimed in claim 1; wherein first metal lead wire is made by the heat conduction elastic deformable material; and it rolls over 80 degree downwards towards the part that the second temperature response circuit protection device forms downwards, makes first metal lead wire apply the close thermal connection that a spring-loaded power is kept to form a machinery to the top of the second temperature response circuit protection device.
8, telecom circuit protection apparatus as claimed in claim 1; wherein the part of first, second that extends from described housing and the 3rd metal lead wire has the cross-sectional area that reduces, and form and make can weld with tie point with the surface-mount devices of accomplishing an external circuit.
9, a kind of telecom circuit protection apparatus comprises
One housing;
Place at least first, second, third and the 4th temperature response circuit protection device in the described housing;
One first metal lead wire, it is connected to first and second temperature response circuit protection devices the first terminal separately, and first metal lead wire is configured and is arranged between the second temperature response circuit protection device and the first temperature response circuit protection device and conducts heat;
One second metal lead wire, it is connected to third and fourth temperature response circuit protection device the first terminal separately, and second metal lead wire is configured and is arranged between the 4th temperature response circuit protection device and the 3rd temperature response circuit protection device and conducts heat;
Third and fourth metal lead wire is connected respectively to the first and the 3rd temperature response circuit protection device second terminal separately;
One five metals belongs to lead-in wire, and it is connected to the second and the 4th temperature response circuit protection device second terminal separately;
First, second, third, fourth and five metals belong to lead-in wire and extend from described housing;
Wherein first metal lead wire is placed on above the first and second temperature response circuit protection devices; and be connected to first and second temperature response circuit protection devices the first terminal separately; first metal lead wire is arranged to connect with the close thermal that forms a machinery and keep against the second temperature response circuit protection device; and wherein second metal lead wire is placed on above the third and fourth temperature response circuit protection device; and be connected to third and fourth temperature response circuit protection device the first terminal separately, second metal lead wire is arranged to connect with the close thermal that forms a machinery and keep against the 4th temperature response circuit protection device.
10, telecom circuit protection apparatus as claimed in claim 9, wherein the first and the 3rd temperature response circuit protection device is a fuse.
11, telecom circuit protection apparatus as claimed in claim 10, wherein this fuse is the fuse of anti-the surge.
12, telecom circuit protection apparatus as claimed in claim 9, wherein the first and the 3rd temperature response circuit protection device is the positive temperature coefficient protector.
13, telecom circuit protection apparatus as claimed in claim 9, wherein the second and the 4th temperature response circuit protection device is the voltage clamp device.
14, telecom circuit protection apparatus as claimed in claim 13, wherein this voltage clamp device is a thyristor.
15, telecom circuit protection apparatus as claimed in claim 9; wherein first metal lead wire is rolled over 80 degree downwards with its downward part; so that in its when assembling, is against the second temperature response circuit protection device; to form the close thermal connection that a machinery is kept; and second metal lead wire with its vertical component effect downwards folding 80 degree so that during its assembling against the 4th temperature response circuit protection device, connect to form the close thermal that a machinery keeps.
16, telecom circuit protection apparatus as claimed in claim 9; wherein first, second, third, fourth and the five metals that extends from housing belongs to lead-in wire and has the cross-sectional area that reduces, and from first, second, third, fourth and five metals that housing extends belong to lead-in wire form and make can weld with as tie point to the surface-mount devices of an external circuit.
17, a kind of telecom circuit protection apparatus comprises:
One housing;
Place first fuse and the one first temperature response voltage clamp device of linking first fuse in the described housing;
One first lead-in wire is placed on first fuse and the first temperature response voltage clamp device, and link this fuse and first temperature response voltage clamp device upper terminal separately, first lead-in wire is along one side extension downwards of the first temperature response voltage clamp device and the close thermal connection of keeping to form a machinery against one side of the first temperature response voltage clamp device;
One second lead-in wire is linked the lower terminal of first fuse;
Place second fuse and the one second temperature response voltage clamp device of linking second fuse in the described housing;
One the 3rd lead-in wire is placed on second fuse and the second temperature response voltage clamp device, and link second fuse and second temperature response voltage clamp device upper terminal separately, the 3rd lead-in wire is along one side extension downwards of the second temperature response voltage clamp device and the close thermal connection of keeping to form a machinery against one side of the second temperature response voltage clamp device;
There is an insulating heat-conductive distance piece of heat conduction printed panel to place between the lower terminal of the lower terminal of the first temperature response voltage clamp device and the second temperature response voltage clamp device on it, an end of this insulating heat-conductive distance piece is connected to one of them lower terminal like this, and the other end of this insulating heat-conductive distance piece is linked another lower terminal;
One the 4th lead-in wire is linked the lower terminal of second fuse; And
One the 5th lead-in wire is linked the heat conduction printed panel on the insulating heat-conductive distance piece, and the first, second, third, fourth and the 5th lead-in wire has the tip that extends from housing.
18, telecom circuit protection apparatus as claimed in claim 17; wherein the part of the first, second, third, fourth and the 5th lead-in wire that extends from housing has the cross-sectional area that reduces, and form and make can weld with as tie point to the surface-mount devices of an external circuit.
19, a kind of telecom circuit protection apparatus comprises:
One housing;
Place first fuse and the one first temperature response voltage clamp device of linking first fuse in the described housing;
One first lead-in wire, it is placed on first fuse and the first temperature response voltage clamp device and links this fuse and first temperature response voltage clamp device upper terminal separately, the close thermal connection that first lead-in wire extends downwards along one side of the first temperature response voltage clamp device and keeps to form a machinery against one side of the first temperature response voltage clamp device;
One second lead-in wire is linked the lower terminal of first fuse;
Place second fuse and the one second temperature response voltage clamp device of linking second fuse in the described housing;
One the 3rd lead-in wire, it is placed on second fuse and the second temperature response voltage clamp device and links second fuse and second temperature response voltage clamp device upper terminal separately, the close thermal connection that the 3rd lead-in wire extends downwards and keeps to form a machinery against one side of the second temperature response voltage clamp device along the second temperature response voltage clamp device;
There is an insulating heat-conductive distance piece of the first and second electric-insulation heat-conduction printed panels to place between the first and second temperature response voltage clamp devices on it, so that the first electric-insulation heat-conduction printed panel is electrically connected to the lower terminal of the first temperature response voltage clamp device, and the second electric-insulation heat-conduction printed panel is electrically connected to the lower terminal of the second temperature response voltage clamp device;
One the 4th lead-in wire is linked the lower terminal of second fuse;
One the 5th the lead-in wire link on the insulating heat-conductive distance piece the first electric-insulation heat-conduction printed panel and
One the 6th lead-in wire is linked the second electric-insulation heat-conduction printed panel on the insulating heat-conductive distance piece, and the first, second, third, fourth, the 5th and the 6th lead-in wire has the tip that extends from described housing.
20, telecom circuit protection apparatus as claimed in claim 19; wherein the part of the first, second, third, fourth, the 5th and the 6th lead-in wire that extends from described housing has the cross-sectional area that reduces, and form and make can weld with as tie point to the surface-mount devices of an external circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47605103P | 2003-06-04 | 2003-06-04 | |
| US60/476,051 | 2003-06-04 | ||
| US10/857,324 | 2004-05-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1802781A CN1802781A (en) | 2006-07-12 |
| CN100588068C true CN100588068C (en) | 2010-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480015605A Active CN100588068C (en) | 2003-06-04 | 2004-06-04 | Telecom circuit protection apparatus |
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| CN (1) | CN100588068C (en) |
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|---|---|---|---|---|
| KR101434136B1 (en) * | 2014-04-25 | 2014-08-27 | 스마트전자 주식회사 | circuit protecting device |
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