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GB2066574A - Switchable electric fuse mounting for fuse cartridge - Google Patents

Switchable electric fuse mounting for fuse cartridge Download PDF

Info

Publication number
GB2066574A
GB2066574A GB8018203A GB8018203A GB2066574A GB 2066574 A GB2066574 A GB 2066574A GB 8018203 A GB8018203 A GB 8018203A GB 8018203 A GB8018203 A GB 8018203A GB 2066574 A GB2066574 A GB 2066574A
Authority
GB
United Kingdom
Prior art keywords
fuse
contact
neutral conductor
fuse mounting
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.)
Withdrawn
Application number
GB8018203A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LINDNER GmbH
Original Assignee
LINDNER GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LINDNER GmbH filed Critical LINDNER GmbH
Publication of GB2066574A publication Critical patent/GB2066574A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10Adaptation for built-in fuses
    • H01H9/104Adaptation for built-in fuses with interlocking mechanism between switch and fuse
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H23/00Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
    • H01H23/02Details
    • H01H23/10Adaptation for built-in fuse
    • H01H23/105Fuses mounted on, or constituting the movable part of, the switch
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0078Security-related arrangements
    • H01H85/0091Security-related arrangements providing disconnection of the neutral line

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Fuses (AREA)

Abstract

A switchable fuse mounting has an additional switch cam (11) on the movable switch fuse holder (4) for the fused live conductor 6, 6', 8, 8' and this cam (11) engages a moving contact (9') with a fixed contact 9 in the neutral conductor path so as to close or interrupt the neutral path when the switch member is moved into a position corresponding to closure or interruption of the fused live conductor path. The neutral switching operation leads the live switching operation on re-establishment of contact and lags behind the live switching operation on interruption of contact. In a modification a closure member for a threaded cartridge fuse may operate a pair of bridging contacts in the live and neutral lines respectively. <IMAGE>

Description

SPECIFICATION Switchable electric fuse mounting for fuse cartridge provided with switchable neutral conductor contacts The invention relates to disconnectable electric fuse mountings.
Fuse mountings are known from FR-PS 2191234 and DAS 2334595, but the fitted fuse mountings disclosed in these documents do not have any neutral conductor contacts.
Nowadays, if a disconnectable neutral conductor is required for an electrical installation basically the same appliances are used as for holding fuse cartridges, but either the fuse cartridges themselves are replaced by a non removable metal casing (see FR-PS 21 91234) or a second current path for the neutral conductor is provided in a switch preceding the fuse cartridge (DAS 2334595). In this last mentioned design the insertion opening for the screw cap of the fuse cartridge would be closed by a dummy plug which is not extractable either. In both cases, the switchable fitted fuse mounting with neutral conductor contacts has to be made up of two separate ddvices, ganged together for instance by rivets, the one device containing the fuse cartridge and the second device the neutral conductor switch contacts.The switch handles of the fitted fuse mounting and of the adjoining "neutral conductor switch" mounting are, in this arrangement, mechanically interconnected so that upon isolation of the phase conductor the neutral conductor is disconnected at the same time.
Because of the usual present coupling of a disconnectable fitted fuse mounting with a fitted neutral conductor, the space requirement in a distributor casing e.g. an in-the-wall recessed distributor box in which the devices are to be fitted is very great. This applies particularly in the case of an alternating current installation since for each phase output via a fitted fuse mounting, an associated disconnectable neutral conductor is an absolute requirement. In addition, extra expenditure on parts, e.g. additional casing components, complicated contact parts, dummy plugs etc. is required. There is the additional factor that this extra expenditure on components also entails additional labour costs in terms of assembly time.Particularly, in the case of such mass-produced articles such as these disconnectable fitted fuse mountings with neutral conductor contacts, the costs are in the last analysis a decisive factor, where there is also the additional consideration that, in accordance with the present day dimensions of the devices, the above-mentioned casing must have a great width.
Electrical ganging together, e.g. by means of a bus bar at the input side, is only possible with considerable technical expenditure since at present the connection terminals of the fitted fuse mounting are located on the same contact plane with those of the neutral conductor mounting coupled with them.
The basic problem to be solved by the invention is the provision of the known switchable fitted fuse mounting with a switchable neutral conductor path in such a way that the width dimension may be kept as narrow as possible, while the expenditure on parts and assembly is considerably reduced. Preferably a problem free electric connection of the supply terminals may be effected by use of the invention.
Accordingly the present invention provides a switchable electric fuse mounting for fuse cartridges provided with end contacts comprising a casing; a switch member in said casing and swerving to interrupt the fused live conductor; neutral conductor contacts inserted in said casing of the fitted fuse mounting and connected to connection terminals; and an additional switch cam connected to said switch member and operable to open and close the current path between said neutral conductor contacts.
The advantages obtained by means of the invention include the fact that it is no longer necessary to use a separate housing for the neutral conductor mounting since the neutral conductor contacts are installed with their connecting terminals, in the housing of the switchable fuse mounting. The interruption of the neutral conductor is effected by means of an additional switch cam on the movable inner component, for example the rockable holder for the fuse cartridge, or by means of an additional projection from the switch element in the switch pin preceding the fuse cartridge insert. In this content, it is useful to arrange the switch cam in such a position that the interruption of the neutral conductor path is effected so that it leads the live conductor interruption and that on reestablishment of contact the live switch lags behind the neutral switch.Offsetting the neutral conductor contact terminals in relation to the contact terminal of the fuse contacts offers the particular advantage that the electric ganging of the devices at the input side may be effected by the usual bus bars, the so-called comb bars where the height of installation is not increased.
The use of an illuminated indicator for recognising the switch state, or the operating state of the fuse cartridge is advantageous as far as the use is concerned since, as has been shown in practice, the actual indicator device or "telltale" of the fuse cartridge does not always fulfil its function.
In order that the present invention may more readily be understood the following description is given, merely by way of example, of several embodiments of the invention, with reference to the accompanying drawing, in which: FIGURE 1 shows a cross-section through one form of a fuse mounting with neutral conductor contacts, where the fuse insert is inserted into a pivotable inner component; FIGURE 2 is a side view of the fuse mounting of Figure 1; FIGURE 3 is a cross-section through another form of fuse mounting with neutral conductor contacts, where the fuse insert is heid in the inner component by means of a screw cap; and FIGURE 4 is a side view of the fuse mounting of Figure 3.
The fuse mounting shown in Figure 1 consists of two casing halves 1, 2. In the cross-sectional view of Figure 1 , the front casing half 2 is not shown. Into the rockable inner component 3, there is inserted the fuse carrier 4. For the sake of clarity the fuse cartridge located in the fuse carrier 4 has been omitted.
If the fuse carrier 4 is rocked into the switched on position by means of the actuating handle 5, the contact springs 6, 6' of the casing make contact with the end contact cap of the fuse cartridge since the contact springs 6, 6' come to lie on the end contact caps of the fuse cartridge projecting from recesses 7, 7' of the inner component 3. The switched on position of the inner component 3 and of the fuse carrier 4 is shown in dashed lines.
A simpler design of the switchable fitted fuse mounting is obtained if the insertable fuse carrier 4 is dispensed with. The rockable inner component 3 is then itself designed for the accommodation of the fuse cartridge and has an added, shaped actuating handle. The contact springs 6, 6' carry the contact terminals 8, 8' for the mains supply and fused outlet respectively.
The direction of the current path, i.e. the direction of current flow along the non-illustrated supply and outlet conductors, is indicated by arrows in the drawing.
In the lower part of the casing halves 1, 2, are the neutral conductor contacts 9, 9' which are also provided with contact terminals 10, 10' for the supply and outlet. It goes without saying that the contact terminals 8, 8' which are represented in the drawing as cage terminals, may also be designed as screw contact terminals like the contact terminals 10, 10'.
By means of a switch cam lobe 11 arranged on the rockable inner component 3, the neutral conductor contacts 9, 9' are also jointly interrupted in the switched off position. The switch cam lobe may instead have a different shape, for instance, the shape of a curvilinear cam face. In the switched on position, the contact of the neutral conductor 9' is pressed by a helical spring 12 on to the contact of the other neutral conductor 9, and makes electrical contact.
The positioning of the switch cam 11 is selected in such a way that the switching on or switching off respectively of the contacts of the neutral conductors 9, 9' is effected before or after switching on or off of the live contacts (the fuse end and the contacts 6, 6') depending on the position of the fuse insert at the instant of switching on and off.
A glow lamp 25 is connected in parallel between contact spring 6' and the neutral conductor contact 9'. The contact terminal 10 of the neutral conductor contact 9 located below the contact terminal 8 of contact spring 6, to allow for bus bars to be fixed on the supply side which are staggered in height and arranged below each other thereby avoiding an increase in the height of the installation. In a manner which is known per se, the preferably strip-shaped contact components are kept in the casing halves 1,2 in corresponding recesses, projections and ribs in itself. This also applies to the embodiment shown in Figure 3.
Figure 3 shows a further embodiment of a disconnectable fitted fuse mounting with neutral conductor contacts. This mounting also consists of two casing halves 1 3, 14 but in contrast to the embodiment shown in Figure 1, the supply line is switched off not by an inner component accommodating the fuse cartridge or the fuse carrier, but instead by means of a switch 1 5 located in the current path ahead of the fuse cartridge. In this Figure too, the fuse cartridge to be inserted into the accommodating space 16 is omitted.The fuse cartridge is introduced in a way known in itself by means of a screw cap - which likewise has been omitted for the sake of greater clarity - into the accommodating space 16 6 and produces, by its end contact caps, electric contact between an end contact 17 and a threaded socket 1 8 for the fuse cartridge. The end contact 1 7 and the threaded socket 1 8 have cage terrnnals 24, 24' for the connection of the supply and output respectively.The neutral conductor contacts 19, 19' have contact screws 20, 20'. The switch element 21 to be likened to the rockable inner component of the Figure 1 embodiment of switchable fuse mounting with neutral conductor contacts has an additional switch cam 22 for the connecting bridge 23 of the neutral conductor contacts 1 9, 1 9'. By giving the air gaps of the switch for the fused live conductor dimensions different from those of the neutral conductor, the desi-ed leading and trailing effect in switching the neutral conductor is obtained in the simplest way.
Offsetting the contact terminals 20, 20' of the neutral conductor laterally in relation to the contact terminals 24, 24' of the live conductor to the fuse cartridge, secures the advantages already referred to with an electric connection by means of a bus bar on the input side.
The embodiment of Figures 3 and 4 may, if desired have an indicator lamp similar to the indicator lamp 25 of Figure 1.
Switchable fitted fuse mountings with switched neutral conductor contacts, as proposed in accordance with the present invention, have a smaller width than previous switched appliances connected in bands to carry out the same junction.
As is known, such fitted appliances are built according to a nine Module System based on the appliance width. With a fitted fuse mounting of the type shown in Figure 1, two module units can thus be saved and with a fitted fuse mounting of the type shown in Figure 3, three Module units (which at present are additionally required for the neutral conductor mounting) can be saved.
At present, it is usual to arrange twelve fitted fuse mountings next to each other as a standard design in one distributor housing. If these conventional fuse mountings must be provided with a switchable neutral conductor, then with the known cartridge fuse mountings the number is reduced to six fitted fuse mountings and six coupled neutral conductor mountings in the case of an alternating current installation. With a three phase current installation there will be a reduction by one circuit if the conventional fuse mountings and neutral line switch units are fitted in the same space.
By using the switchable fitted fuse mountings with built-in switchable neutral conductor contacts, in accordance with the invention, the number of circuits which can be fitted into a given space will be the same as the number of switchable cartridge fuse holders which can be fitted into the same space without provision for switching of the neutral line, because of the compactness of the appliances in accordance with this invention.
Both of the illustrated embodiments have, in the bottom of the housing 1, a recess which is closable by a spring detent gate to allow the housing to be snapped onto a support rail (not shown) in a bank of similar fuse mountings, and to be released from the support rail by manual actuation of the spring detent gate.

Claims (9)

1. A switchable electric fuse mounting for fuse cartridges provided with end contacts comprising a casing; a switch member in said casing and serving to interrupt the fused live conductor; neutral conductor contacts inserted in said casing of the fitted fuse mounting and connected to connection terminals; and an additional switch cam connected to said switch member and operable to open and close the current path between said neutral conductor contacts.
2. A switchable electric fuse mounting according to claim 1, wherein said additional switch cam is carried by the switch member in such a way that the switching operation for the interruption and re-establishment of the neutral conductor contacts occurs before the switching operation of the fuse cartridge for reestablishment of contact and after the switching of the fuse cartridge for the interruption of contact.
3. A switchable electric fuse mounting according to claim 1 or claim 2, wherein said connection terminals of the neutral conductor contacts are offset in the casing in relation to the connection terminals for the switchable fused live conductor.
4. A switchable electric fuse mounting according to any one of claims 1 to 3, wherein one of said neutral conductor contacts and a corresponding contact for the fuse cartridge are efectrically interconnected via an illuminated indicator.
5. A switchable electric fuse mounting according to any one of claims 1 to 4, wherein said switch member is a rotary socket for said fuse cartridge and said additional switch cam projects from said rotary socket to engage a moving contact of said neutral conductor contacts.
6. A switchable electric fuse mounting according to any one of claims 1 to 4, wherein said switch member is a spring biased axially movable pin carrying a moving contact of the fused live conductor and has said additional switch cam at one end thereof to engage a movable contact of said neutral conductor contacts.
7. A switchable electric fuse mounting according to claims 2 and 6, wherein the distance, measured in a direction axially of said pin, between said moving contacts of the live and neutral conductors is greater in the "contact established" configuration of the switch than in the "contact interrupted" configuration.
8. A switchable electric fuse mounting according to any one of claims 1 to 7, and including a spring detent-operated mounting to support said casing on a support rail in a bank of similar fuse mountings.
9. A switchable electric fuse mounting constructed and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, Figures 1 and 2, or Figures 3 and 4, of the accompanying drawing.
GB8018203A 1979-12-22 1980-06-04 Switchable electric fuse mounting for fuse cartridge Withdrawn GB2066574A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2952132A DE2952132B1 (en) 1979-12-22 1979-12-22 Disconnectable electrical built-in fuse bases for fuse links with end contact caps and separable neutral contacts

Publications (1)

Publication Number Publication Date
GB2066574A true GB2066574A (en) 1981-07-08

Family

ID=6089519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8018203A Withdrawn GB2066574A (en) 1979-12-22 1980-06-04 Switchable electric fuse mounting for fuse cartridge

Country Status (8)

Country Link
BE (1) BE883797A (en)
DE (1) DE2952132B1 (en)
DK (1) DK542280A (en)
ES (1) ES8200520A1 (en)
FR (1) FR2474238A1 (en)
GB (1) GB2066574A (en)
IT (1) IT1131215B (en)
NL (1) NL8005178A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514942A1 (en) * 1981-10-21 1983-04-22 Hager Electro Rocking mains switch with fuse-holder - allows live and neutral lines to be separately closed and only allows access to fuse when live circuit is open
FR2551915A1 (en) * 1983-09-08 1985-03-15 Hager Electro Improvements to circuit cut-outs with oscillating holder carrying a fuse cartridge and forming a cam for control of an auxiliary circuit
FR2728384A1 (en) * 1994-12-20 1996-06-21 Legrand Sa CIRCUIT BREAKER WITH FUSE HOLDER HANGER
WO2004034415A1 (en) * 2002-10-09 2004-04-22 Klaus Bruchmann Multipolar fuse circuit breaker assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424556A1 (en) * 1984-04-04 1985-10-31 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Electrical installation fuse base for melting fuses
DE3568104D1 (en) * 1984-04-04 1989-03-09 Lindner Gmbh Built-in fuse socket for cut-out fuse
DE19956295C1 (en) * 1999-11-23 2001-09-06 Klaus Bruchmann Breaker protection unit has fuse carrier, fuse status indicator with contacts connected via conducting connections to bridge element and second unit connection
DE50006530D1 (en) 1999-11-23 2004-06-24 Klaus Bruchmann SWITCH FUSE UNIT WITH FUSE HOLDER AND FUSE STATUS DETECTOR
AT505093B1 (en) * 2004-01-19 2013-02-15 Moeller Gebaeudeautomation Kg ELECTROMECHANICAL SWITCH
US7855873B2 (en) * 2004-09-13 2010-12-21 Cooper Technologies Company Panelboard for fusible switching disconnect devices

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE959290C (en) * 1954-06-01 1957-03-07 Licentia Gmbh Switching device, in particular installation circuit breakers, with thermal and magnetic release
GB869242A (en) * 1958-08-25 1961-05-31 North Western Electric Applian Improvements relating to temperature controls for electrically heated appliances
FR2191234B1 (en) * 1972-06-28 1976-08-06 Faeam
DE2334595B1 (en) * 1973-07-07 1974-04-25 Lindner Gmbh Fabrik Elek Scher Fuse base with a switch for fusible links
DE2445262A1 (en) * 1974-09-21 1976-04-08 Bbc Brown Boveri & Cie Safety cct. breaker with fuse socket - has actuating lever for coupling fuse between head and bottom contacts
DE2642223A1 (en) * 1976-09-20 1978-03-23 Schulte Elektrotech Electrical fuse unit with fuse changing device - using rotatable switch ring carried by fuse capsule to disconnect power during fuse changing
FR2431762A1 (en) * 1978-07-19 1980-02-15 Legrand Sa Circuit breaker with rocker switch retaining cartridge fuse - breaks live circuit and independent neutral circuit when fuse is exposed

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514942A1 (en) * 1981-10-21 1983-04-22 Hager Electro Rocking mains switch with fuse-holder - allows live and neutral lines to be separately closed and only allows access to fuse when live circuit is open
FR2551915A1 (en) * 1983-09-08 1985-03-15 Hager Electro Improvements to circuit cut-outs with oscillating holder carrying a fuse cartridge and forming a cam for control of an auxiliary circuit
FR2728384A1 (en) * 1994-12-20 1996-06-21 Legrand Sa CIRCUIT BREAKER WITH FUSE HOLDER HANGER
WO2004034415A1 (en) * 2002-10-09 2004-04-22 Klaus Bruchmann Multipolar fuse circuit breaker assembly

Also Published As

Publication number Publication date
ES497969A0 (en) 1981-11-01
NL8005178A (en) 1981-07-16
FR2474238A1 (en) 1981-07-24
DE2952132B1 (en) 1981-06-11
BE883797A (en) 1980-10-01
ES8200520A1 (en) 1981-11-01
IT1131215B (en) 1986-06-18
IT8022446A0 (en) 1980-05-30
DK542280A (en) 1981-06-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)