The invention relates to an overvoltage protection magazine for a telecommunications device.
DE 34 30 922 A1 discloses a surge arrester and fuse magazine in which, for each conductance path with supply line and output line, a fuse and/or a dual surge arrester can be clamped into a holder in the overvoltage protection magazine by means of contact springs, one contact track being provided as the disconnection element at the front and at the rear for each conductance path on the bottom of the overvoltage protection magazine which can be plugged in, each contact track being connected to one pole of the fuse, the poles of the fuses each being connected to one pole of the dual surge arrester and the center contacts of the dual surge arresters being positioned on a common ground rail which is connected to two ground tap terminals. One disadvantage of the known overvoltage protection magazine is the large amount of physical space it requires, in particular since both the dual surge arrester and the fuses are in each case arranged in two rows.
DE 198 18 477 A1 discloses an overvoltage protection magazine for a telecommunications device having a housing, two or more contacts, a section of which extends from the rear of the housing and which, when assembled, touch contacts of the telecommunications device, and at least one ground contact, it being possible for two or more surge arresters to be inserted into the overvoltage protection magazine, said arresters having legs which, when inserted, are electrically conductively connected directly to the contacts, the contacts each having a contact slot which is defined by two contact limbs lying predominantly on the same plane, it being possible for the surge arresters to be inserted from the front of the housing in the direction of their legs such that, when inserted, the respective leg extends into the contact slot in a direction predominantly parallel to said contact slot, and the surge arresters are located alternately on at least two different levels as regards the depth dimension of the overvoltage protection magazine such that they are arranged offset from one another when viewed from above. This makes it unnecessary to provide a printed circuit board in the overvoltage protection magazine. Disadvantages of the known overvoltage protection magazine include the comparatively large amount of physical space which is still required and the very high production complexity.
The invention is therefore based on the technical problem of providing an overvoltage protection magazine which is simple to produce and requires only a small amount of physical space.
In this regard, the surge arresters are arranged in a row on a printed circuit board. This allows for simple construction and simple routing of the conductor tracks whilst being able to keep the printed circuit board relatively small.
The surge arresters are preferably in the form of SMD surge arresters, making it possible to mount components on the printed circuit board in a simple manner. A further advantage of the SMD components is that they are easier to recycle. By heating the printed circuit board, the SMD components fall off, making it easy to separate the printed circuit board and the surge arresters. In the case of surge arresters having contact legs, on the other hand, there are often bends, making it necessary to separate the components from the printed circuit board manually.
In a further preferred embodiment, the housing is integral, which reduces production costs. This is possible, in particular, since contact with the electrical contacts of the device is made via the contact pads on the printed circuit board. Since the printed circuit board is relatively robust, the structured printed circuit board can easily be pushed through openings provided in the housing. In embodiments from the prior art in which separate contacts are soldered to the printed circuit board or fixed directly to the surge arresters, there is a relatively large gap between the contacts, making integral housings impractical.
In a further preferred embodiment, the housing is open at the top and covered by an insulator strip. This is a simple means of providing protection for the user against electric shocks. The insulator strip is preferably in the form of a plastic strip which may also be used, if necessary, as a label.
In a further preferred embodiment, the inner sides of the housing are provided with supports for the insulator strip in order to provide sufficient support for this strip on the housing.
In a further preferred embodiment, the housing is provided with semicylindrical recesses which are provided with slots in the region of the top of the housing, the insulator strip being passed between the slots. In addition to a sufficient contact area being provided, this fixes the insulator strip and mechanically stabilizes the housing.
In a further preferred embodiment, the edges at the top of the housing are set back at the sides such that the insulator strip is flush with the top of the housing. This means that the edges of the housing do not press into the installer's fingers when the overvoltage magazine is pushed in and that the installer can apply pressure over the entire width.
In a further preferred embodiment, the housing is provided on the end side with at least one slot by means of which the insulator strip can be levered out using a tool.
In a further preferred embodiment, the ground contact is in the form of a fork contact and is connected to the printed circuit board via the fork contact, the fork contact preferably being in the form of a dual fork contact. This makes it possible to connect the fork contact to the printed circuit board without soldering.
In a further preferred embodiment, the surge arresters are fail-safe.
In a further preferred embodiment, the contact pads of the printed circuit board are made of silver, since silver has sufficient mechanical strength.
In a further preferred embodiment, the bottom of the housing is provided with cutouts in the region of the fork contacts such that the overvoltage protection magazine can easily be levered out using a tool when it is plugged onto a distribution strip.
The invention is explained in more detail below with reference to a preferred exemplary embodiment. In the figures:
Number | Date | Country | Kind |
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103 17 621 | Apr 2003 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2004/003231 | 3/26/2004 | WO | 00 | 11/6/2006 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2004/093275 | 10/28/2004 | WO | A |
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5643014 | Filus et al. | Jul 1997 | A |
5755026 | Stephan et al. | May 1998 | A |
5844785 | Daoud et al. | Dec 1998 | A |
6166894 | Kane | Dec 2000 | A |
Number | Date | Country |
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755266 | Nov 1999 | AU |
34 30 922 | Mar 1986 | DE |
42 36 584 | Jun 1993 | DE |
198 18 477 | Oct 1999 | DE |
232890 | Dec 1990 | EP |
0 410 140 | Jan 1991 | EP |
0 460 223 | Dec 1991 | EP |
WO 9737407 | Oct 1997 | WO |
WO 9737408 | Oct 1997 | WO |
WO 9749151 | Dec 1997 | WO |
WO 0197332 | Dec 2001 | WO |
Number | Date | Country | |
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20070064373 A1 | Mar 2007 | US |