MXPA98004029A - Protection plug against overvoltages condition of protection against fal - Google Patents

Abstract

The invention relates to a protective plug against overvoltages, which includes at least one electrical voltage limiting component with an associated fuse element and a fault protection device (6), in which the fuse element trips in case of thermal overheating the protection device against faults (6), which can optionally be extended with an optical signaling of the protection against faults, in which the electrical voltage limiting component is disposed, with the associated fuse element and the protection device against faults (6), as closed unit on a first conductive plate (3), to which optionally the optical signaling of the protection against failures disposed on a second separate conductive plate (10) may be associated. (Fig.

Description

PROTECTION PLUG AGAINST OVERVOLTAGES WITH PROTECTION DEVICE AGAINST FAULTS Description; The invention relates to a plug for protection against overvoltages according to the preamble of claim 1. In particular in the telecommunications and data transmission technology plugs are used to protect against overvoltages, to protect the connected pairs against overvoltages and overcurrents due to technical defects or external disturbances such as, for example, lightning strikes. For this purpose, such plugs have an electrical voltage limiting component and most often also a current limiting component, to which a fusible element is associated, most of the time in the form of a welding ball. If an overcurrent of a long duration occurs in the voltage limiting component, the solder pellet melts due to the loss heat that occurs in the component, thus most of the time a mechanical device for protection against failures. short the lines to ground. This is necessary, since due to the overvoltages and overcurrents that occur, the components could possibly be affected in their functionality. For a simpler identification of the protection devices against faults that were triggered, the most diverse optical signaling of faults protection is already known, using mainly light diodes. For the signaling of the triggering of a protection device against failures, several solutions are known. In the event of overheating of the electrical voltage limiting component, in addition to the short circuit of a and b towards the ground, the triggering of a process that runs in parallel (indirect signaling) can be induced. The specific process of safety in the triggering of the protection device against failures is here completely separated from the process processes, but the only approximate relationship is disadvantageous. Also in the case of an optimal adjustment of both processes, thermal configurations are always possible in which the protection device against failures has been triggered, but the signaling has not occurred, or vice versa. Solutions for direct signaling are known, in which after the fusion of a welding ball, the moving part of the protection device against failures, by elastic force, makes contact when reaching its final position, in addition to the contact points for lines a and b, with another point of contact for signaling. The structural conformation must be produced here in such a way that the contact point for the signaling is made slightly elastic, in order to prevent an obstacle to the movement of the protection device against failures. In any case it should be avoided that due to the third contact point, the tightening force is too small at both points of contact a-ground and J-ground, or that even no contact occurs. It is known to arrange the components of the protection plug against faults on a conductive plate. As the optical signaling of the protection against failures is not desired or is not always necessary, two types of conductive plates are manufactured, namely one with and one without an optical signaling of the protection against failures. Due to the additional components for the optical signaling of the protection against failures, the geometrical dimensions of the conductive plate also grow. In order to be able to use, however, the same housing for both conductive plate variants, this housing is designed correspondingly to the larger conductive plate. Furthermore, when arranging the plug in a housing, it must be configured in such a way that the optical signaling of the protection against faults can be perceived. To do this, the housing has one arranged at the end of the plug, to be detected optically. The opening must be closed in the plug version without signaling the fault protection. The invention is based on the problem of creating a protective plug against overvoltages, which is compactly built, easily re-adapted and only makes small structural variations in a housing necessary. The solution of the technical problem occurs through the features of claim 1. By forming the overvoltage protection plug as a closed unit on a conductive plate and the arrangement of the optical signaling of the protection against failures on a plate Separate conductor, which can be associated with the first conductive plate if necessary, results in a simple retrofit for the optical signaling of the protection against failures without further assembly of components. Since the geometrical dimensions of the first conductive plate are always the same, this is not necessary in case of placement in a housing of space projections for the optical signaling of the protection against faults, which allows a more compact structure. In particular, if the second conductive plate is arranged on top of the first conductive plate, the components of the second conductive plate can then be arranged in the recesses between the components of the first conductive plate. Another advantage is that the first conductive plate has a greater number of applications and can be manufactured with it in greater quantities, which reduces its cost per piece. This also results in a simple retrofit in case of placement in housings, without the housing having to be structurally modified later. In the housing only guides for both conductive plates have to be provided so that the conductive plates can be inserted or removed. optical, the associated housing part is then transparently shaped. Here it is possible to shape the associated housing part always in a transparent manner, regardless of whether or not the optical signaling of the fault protection is necessary, or to replace the corresponding parts of the housing when carrying out a retrofit. In addition, the shaping in separate conductor plates allows a hole to be centrally disposed in the first conductor plate, so that the first conductor plate can be moved by a suitable tension hook. Other advantageous structures of the invention result from the dependent claims. The invention is explained in more detail below with the aid of a preferred exemplary embodiment. The figures show: 1 shows a side elevation view of the overvoltage protection plug with an optical signaling of the protection against failures in a housing, FIG. 2 a perspective view from above on the first conductive plate with an associated housing part and FIG. 3 shows a perspective view from above on the second conductive plate with an associated housing part. 1 shows the side elevation view of a housing to be equipped with a surge protection plug, which includes a lower housing part 1 and an upper part of a three-pole surge arrester 4 as a voltage limiting component. electrical and two PTC 5 resistors as current limiting components. The surge arrester 4 and the PTC resistors 5 are formed in cylindrical form and are arranged in grooves and / or slits in the conductive plate 3, where they are then connected electrically conductively, for example by reflow soldering. After the welding of the surge arrester 4 and the PTC resistors 5, a fail-safe contact 6 is interlocked on the surge arrester 4, resulting in an additional fixing of the fail-safe device 6 through a slit in the surge arrester 4. the conductive plate 3. The fail-safe contact 6 is here connected through the central electrode of the surge arrester 4 permanently to the ground potential. Between the surge arrester 4 and the fail-safe contact 6, a fusible element formed as a solder ball 7 is disposed, which is fixedly connected to the fail-safe contact 6. In the event of overheating of the surge arrester 4 the weld ball 7 melts, and the short-circuit bracket, under pre-tension in the normal state, of the fail-safe contact 6 moves to the left towards the surge arrester 4, the short-circuit bracket contacting the state relaxed with both outer electrodes of the surge arrester 4. Thus both outer electrodes are nevertheless also at ground potential, as is a pair connected to the outer electrodes. Furthermore, an elastic earth contact 8 is arranged on the conductive plate 3, through which the earth potential is supplied to the conductive plate 3. The elastic earth contact 8 is arranged outside the housing here, so that it can be accessed to him relatively freely. For this reason, the 19 can be extracted, in an easy to make, as a tongue by bending from the delivery tray of a distributor. In the end area of the conductive plate 3 there is centrally a hole 9, which makes it possible to pull the conductive plate 3 by means of a corresponding tool, the tool being able to be guided through a perforation 18 located in the lower part of the housing 1 towards the inside of the accommodation. The conductive plate 3 is pressed into the lower housing part 2 for the installation, and is connected to this part by locking. When it is introduced, the conductive plate 3 is covered on the lower side completely by the lower housing part 1, so that an additional passivation for the protection of the conductive lines against contact or damage can be dispensed with. The optical signaling of the protection against faults, optionally desired, is carried out by means of a second conductive plate 10. On the conductive plate 10 there are arranged a light-emitting diode 11, a current-limiting resistor 12, a voltage-contact voltage 13 and a connection contact 14. The light-emitting diode 11 and the current-limiting resistor 12, which are both preferably formed according to the SMD technique ("surface mount device"), of surface mount devices), form the signaling itself of protection against failures. The rated voltage contact 13 is formed elastically, like the ground contact 8, and extends outwardly from the upper housing part 2, so that its conjugate part with which it contacts can also be manufactured by means of extraction by folding a tongue into a signal plate 20 which conducts the rated voltage. The conformation of the ground contacts 8 or of the voltage contacts 13 allows the simultaneous contact establishment with up to 200. additional The connection contact 14 establishes the connection between the first conductive plate 3 and the second conductive plate 10 in the event of tripping of the fail-safe contact 6. For this purpose, the connection contact 14 is prestressed against the welding bead 7, an insulating layer 15 is disposed between the welding pellet 7 and the connection contact 14. As long as the fail-safe contact 6 does not trip, the electric circuit of the light-emitting diode 11 is open. If the soldering bead 7 melts, the pre-stressed connection contact 14 moves in the direction of the fail-safe contact 6 and makes contact with it below the solder bead 7 and the insulating layer 15 by means of a bent projection. . Due to the fact that the fault protection contact 6 and the connection contact 14 move in the same direction, there is no weakening of the actual protection process due to the optical signaling of the protection against failure. to failures. Instead of the welding ball 7 with the insulating layer 15, an electrical insulator could also be used, which would exhibit a similar temperature dependent melting behavior. The conductive plate 10 is pressed into the upper housing part 2 by locking, like the conductive plate 3. For this purpose, the conductive plate 10 is inserted behind a shoulder 16 and pressed upwards, where it is clamped. by a lace appendage 17 that embraces it. The housing upper part 2 is formed at least partially transparent, so that the optical protection signaling against faults can be perceived outside the housing. Due to the mechanical protection of the light-emitting diode 11 through the housing, this diode can be shaped as a SMD-type diode that emits laterally. For the mounting of the overvoltage protection plug, the conductive plates 3, 10 are connected by locking to the corresponding lower part shown in FIG. 2 or FIG. 3. The lower part is then fitted on the lower part. of accommodation 1 and the upper housing part, in which fitting elements 21 of the lower housing part 1 are locked in corresponding fitting openings 22 of the upper housing part 2 and establish a fixed connection.

LIST OF REFERENCE NUMBERS ) Housing lower part) Housing top) Conductor plate) Surge arrester) PTC resistor) Fault protection contact) Welding ball) Earth contact) Drilling 0) Conductor plate 1) Light diode 2) Resistance limiter current 3) Regress voltage contact 4) Connection contact 5) Insulation layer 6) Highlight 7) Fitting attachment 8) Drilling 9) Ground rail 0) Signal plate 1) Fitting elements 2) Lace openings

Claims (14)

1. Overvoltage protection plug, which includes at least one voltage limiting component with an associated fuse element and a fault protection device, in which the fuse element trips in case of thermal overheating the protection device against faults , which can optionally be extended with an optical signaling of the protection against faults, characterized in that the electrical voltage limiting component is arranged, with the associated fuse element and the fault protection device (6), as a closed unit on a first conductive plate (3), to which optionally the optical signaling of the protection against failures disposed on a second second conductive plate (10) can be optionally associated.

2. Surge protection plug according to claim 1, characterized in that the conductive plates (3, 10) are arranged at least partially in a common housing (1, 2), whose surface (2) faces the signaling of the Protection against failures is shaped transparently.

3. Surge protection plug according to claim 2, characterized in that the conductive plates (3, 10) are fixed by interlocking, at a defined distance from one another, in the housing (1, 2).

4. Overvoltage protection plug according to one of the preceding claims, characterized in that the electrical voltage limiting component is designed as surge arrester (4).

Surge protection plug according to one of the preceding claims, characterized in that the surge arresting component is substantially cylindrically shaped and is arranged in slots and / or grooves of the conductive plate (3).

6. Overvoltage protection plug according to one of the preceding claims, characterized in that the fault protection device (6) is locked on the electrical voltage limiting component and is fixed in a slot of the conductive plate (3).

7. Overvoltage protection plug according to one of the preceding claims, characterized in that the conductive plate (3) is formed with an elastic ground contact (8), which, in the case of partial arrangement of the conductive plate (3) inside the housing (1, 2), it is located outside it.

The surge protection plug according to one of the preceding claims, characterized in that the conductive plate (3) has a bore (9) in the end region.

9. Surge protection plug according to one of the preceding claims, characterized in that the signaling unit includes a light diode (11), a limiting resistor (12), a voltage contact (13) and a connection contact. (14), which electrically connects both conductive plates (3, 10) to each other when the protection device against failures (6) is triggered.

10. Surge protection plug according to claim 9, characterized in that the light-emitting diode (11) and / or the limiting resistor (12) are shaped as SMD-type components.

11. Surge protection plug according to claim 9 or 10, characterized in that the voltage contact (13) is formed as elastic contact, which, in the case of partial arrangement of the conductive plate (10) inside the housing (1, 2), is located outside the latter.

12. Overvoltage protection plug according to one of the preceding claims, characterized in that the same fusible element is associated to the fault protection device (6) and to the protection signaling against failures, whose fusible element is partially arranged between the device protection against faults (6) and the electrical voltage limiting component and partly between the fault protection device (6) and the connection contact (14), in which the connection contact (14) is under pre-tension through the fusible element, so that in the event of triggering of the failure protection device (6) a connection can be carried out for the connection contact (14). movement towards the protection device against faults (6).

13. Surge protection plug according to claim 12, characterized in that the fusible element is formed as a welding ball (7) and an insulating layer (between the welding ball (7) and the connection contact (14) is arranged). fifteen) .

14. Protective plug against overvoltages and overcurrents according to claim 12, characterized in that the fusible element is formed as an electrical insulator with a temperature-dependent melting behavior.