EP0017819B1 - Niederspannungs-Lastschalter mit Sicherung - Google Patents

Niederspannungs-Lastschalter mit Sicherung Download PDF

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Publication number
EP0017819B1
EP0017819B1 EP80101612A EP80101612A EP0017819B1 EP 0017819 B1 EP0017819 B1 EP 0017819B1 EP 80101612 A EP80101612 A EP 80101612A EP 80101612 A EP80101612 A EP 80101612A EP 0017819 B1 EP0017819 B1 EP 0017819B1
Authority
EP
European Patent Office
Prior art keywords
fuse
contact
switch
screw cap
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
Application number
EP80101612A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0017819A1 (de
Inventor
Richard Schulz
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT80101612T priority Critical patent/ATE4259T1/de
Publication of EP0017819A1 publication Critical patent/EP0017819A1/de
Application granted granted Critical
Publication of EP0017819B1 publication Critical patent/EP0017819B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective 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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/62—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers the intermediate or auxiliary part being adapted for screwing into the base
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H01H9/104—Adaptation for built-in fuses with interlocking mechanism between switch and fuse

Definitions

  • the invention relates to a low-voltage circuit breaker with fuse, hereinafter referred to as a fuse switch, as described in the preamble of the main claim.
  • the fuse link is arranged between an additional head contact covered by a flap, which can be designed as a screw cap, and a foot contact of the fuse base under spring force.
  • a power switch coupled to the flap is arranged in the power supply of the fuse base and is locked in the open position when the fuse link is removed.
  • an imaginary connecting line through the contacts of the circuit breaker in the switched-on state has approximately the same direction as the imaginary connecting line through the contacts of the fuse, consisting of the fuse base and fuse insert.
  • the invention is based on the finding that, although it is desirable to arrange the contacts of the fuse in such a way that the connection line, seen via a replacement process of the fuse link, is not changed for the reasons described above, that the imaginary connection line is changed by the contacts of the load switch can be placed at an angle.
  • the contacts of the fuse are arranged in such a way that the connection line is retained when viewed through an exchange or switching operation, but this device lacks a spring which is the contact force of the Ensures security independently of an operator.
  • the screw cap of the fuse link can be actuated when the flap is closed, as a result of which the contacts are exposed to particular loads when switching slowly.
  • the contact pressure between the fuse link and the foot contact of the device depends on how strongly an operator pulls the fuse link.
  • the contact pressure on the connection flaps of the fuse link is generally generated by screwing the screw cap into a threaded part, the so-called threaded eyeglass.
  • the contact pressure therefore depends on the operator. Too little contact pressure leads to increased contact resistance and can damage the contact points after a long period of operation. Since meter backup fuses are only exchanged rarely, usually only after very long operating times, a sufficiently high contact pressure and a correspondingly low contact resistance with a predetermined value must be ensured.
  • lugs and cutouts are provided in a known lower fuse part (DE-B2-2409238).
  • the insulating cap, with the fuse insert inserted is first inserted in the axial direction up to a stop and then guided into a latching position by movement perpendicular to the longitudinal axis. This represents an unusual movement sequence for the operators and, due to the tolerances of the latching means, a constant contact pressure is not guaranteed here either.
  • Fuses which can be switched off are known (DE-Al-2 642 223), in which the contact to the fuse link is made after insertion by a rotary movement in the manner of a toggle switch. Since tolerances must also be compensated for here, the contacts are designed to be resilient, which is why they can only carry weak currents.
  • the invention has for its object to develop a compact fuse switch in which the power loss of the fuse link can be derived on the one hand, the contact pressure is achieved independently of the operator and tolerances and that even when switching contacts under load neither when switching nor afterwards can burn in long-term operation.
  • the contact arrangement in the load switch results in a low device construction with a large switching path or stroke of the switching contacts.
  • the flap closing on the side prevents the screw cap from being screwed onto the fuse link before the flap is actuated. This and because the contacts are suddenly released via a mechanism like a toggle lever, ensures reliable switching.
  • the contacts of the circuit breaker can therefore not scorch.
  • the fuse switch according to the invention is designed as a load switch, which makes it possible to switch even under load and to replace the fuse safely.
  • the head contact of the fuse link can be arranged in a manner known per se (FR-A-1404511) in a screw cap made of a handle and threaded sleeve, in which a viewing window is permanently clamped between the handle of the screw cap and the threaded sleeve firmly connected to it. This further increases security against power theft.
  • the handle of the screw cap forms grip ribs and rib-shaped depressions on its outer edge, which are drawn over rounded edges up to the front side close to the viewing window.
  • the screw cap can also be screwed in and out more easily if it only protrudes slightly beyond the edge of the housing.
  • the height of the handle of the screw cap is expediently matched to the stroke existing between the switch-on position and the switch-off position of the fuse base in such a way that it is always in a gap-like connection to a trough-shaped edge of the housing surrounding it.
  • the load switch forms a contact arrangement from two parallel contact zones, the current load is divided.
  • a particularly space-saving design is achieved with a large stroke of the switch contacts in that the contacts of the circuit breaker are formed on the one hand by an end-turned extension of a foot contact of the fuse base designed as a rail and on the other hand by two adjacent swivel arms which are bent towards each other at their free end, whereby the swivel arms are hinged to the base of the connection terminal for the power supply. In their interior, they can each receive a contact pressure spring, which is supported on its other side against the housing of the fuse switch.
  • connection terminal for the power supply has a saddle roof shape in side view and a rectangular plan, you can clamp thick conductors under the saddle and thin conductors across the saddle line.
  • connection terminal can be used universally if its clamping piece is arranged so that it can be implemented.
  • a fuse link can be arranged between a head contact covered by the screw cap 3 and a foot contact 4 of a fuse base.
  • the head contact in the screw cap is additionally covered by a flap 5. In the open position of the flap 5, according to FIG. 3, it is locked against being switched on again when the fuse insert 6 is removed, since the magazine 7 engages behind a stop 8 according to FIG. 3 with a nose.
  • the foot contact 4 is raised in the direction of the imaginary connecting line 10 to the head contact under the action of the spring 9 by means of the magazine 7 made of high-temperature resistant material.
  • the foot contact 4 can be firmly connected to the magazine 7.
  • the load switch 1 has such an arrangement of the contact pieces 12 and 13 that the imaginary connecting line 11 of its contact pieces is inclined to the connecting line 10 of the head and foot contact of the fuse base.
  • the flap 5 closes laterally and prevents access to the screw cap 3.
  • the contact pieces 12 and 13 are suddenly released via a mechanism 14 in the manner of a toggle lever, in particular when switched on.
  • the toggle lever is essentially formed by two flap limbs 15 to be presented one behind the other in the plane of the drawing and two switching limbs 16.
  • the flap legs are articulated on the axis 18.
  • the switching legs 16 are each connected in an articulated manner to connecting legs 19, which act on two pivot arms 21 about the fixed axis 20.
  • the load switch 1 has a contact arrangement comprising two parallel contact zones, one of which can be seen in the drawing, namely that with the contact pieces 12 and 13.
  • the contact pieces of the circuit breaker are formed, on the one hand, by a terminally bent extension of the foot contact 4, which is designed as a rail, of the securing base, and, on the other hand, by the two adjacent pivot arms 21, which are bent towards one another at their free end.
  • the swivel arms 21 are articulated on the base 22 of the connection terminal 23 for the power supply. In their interior, they each hold a contact pressure spring 24, which is supported on its other side against the housing 25.
  • connection terminal 23 provided for the power supply is of a saddle roof shape in the side view according to FIG. 2 and is rectangular in plan. Under the saddle you can clamp thick conductors and thin conductors across the saddle, i.e. in the plane of the drawing according to FIG. 2. By appropriately shaping the housing, the clamping piece of the connection terminal can be implemented in the connection level by 90 °.
  • the helical spring 26 with extended and fork-shaped ends on the one hand lifts the switching leg 16 and thus holds the flap 5 in the closed rest position.
  • the helical spring 26 causes a contact pressure between the legs of the base 22 of the connecting terminal 23 and the swivel arms 21.
  • the base 22 of the connecting terminal and the swivel arms 21 are made of electrically conductive material, while the hinged legs 15 and switching legs 16 are made of insulating material.
  • the contact pressure between the contact pieces 12 and 13 of the contact arrangement of the circuit breaker is ensured in each case by the contact pressure spring 24 designed as a compression spring.
  • the current is conducted from the connecting terminal 23 via the swivel arms 21 to the foot contact 4 through the fuse link to the head contact in the screw cap via the threaded sleeve 31 to the threaded eyeglass 32 and from there to the outgoing terminal 33.
  • the load switch When the flap 5 is open, the load switch is open, as can be seen in principle from FIG. 3. If you remove the fuse link 6 from the magazine 7, it is raised until it engages behind the edge 8 of a flap 5 of the flap 5 and the flap 5 is thereby locked against being switched on again until a fuse link is screwed in.
  • the magazine 7 When a fuse link is screwed in, the magazine 7 is moved downward from the position shown in FIG. To the position shown in FIG. 1. The action of the spring 9 ensures sufficient contact pressure with the fuse link.
  • the magazine 7 of the fuse base can accommodate dowels in the usual way to ensure that only fuse links of a certain nominal current can be used.
  • the housing 25 can be formed from two similar shells 40, as can be seen from FIGS. 2 and 4.
  • the housing shells can are held together by rivets 41.
  • the flap 5 is articulated on the fixed axis 18.
  • the movable axis 43 forms the knee of the toggle lever for the load switch.
  • a molded nose 50 lies against the flank 51 of the flap leg 15 after a short free travel and lifts the axis 43 about the stationary axis 18 and out of the knee position, whereby the switching legs 16 raise the axis 52 and pivot the pivot arms 21, so that the contacts are closed under the action of the contact pressure springs 24 of the circuit breaker.
  • a ventilation channel 53 leads past the magazine 7 from the contact pieces of the load switch 1. In the exemplary embodiment, it is connected to the outside air via a ventilation slot 54.
  • the structure described enables a compact, low fuse switch that can be snapped onto device mounting rails like other installation devices.
  • the housing has lugs 55 and 56, the lug 56 being a sprung sheet metal part, a so-called slide.
  • the screw cap 3 according to FIG. 7 has a handle 30 and a threaded sleeve 31.
  • the handle 30 of the screw cap forms grip ribs 60 and rib-shaped depressions 61 on its outer edge, which are drawn over rounded edges 62 up to the front side close to the viewing window 63 according to FIG. 8. This makes the screw cap easy to grip and operate.
  • the inspection window 63 according to FIG. 8 can be used to check whether the fuse link has responded and should therefore be replaced.
  • the lens 63 is clamped between the handle 30 of the screw cap and the threaded sleeve 31 firmly connected thereto. If the threaded sleeve 31 to the viewing window 63 forms a bottle neck-like approach according to FIG. 8, after the fuse link has responded, the dropped indicator sheet can be reliably accommodated. This ensures a safe display and prevents the indicator sheet from falling into the fuse switch when it is replaced.
  • the flanks 64 of the bottle neck-like narrowing of the threaded sleeve 31 form the head contact of the fuse.

Landscapes

  • Fuses (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
EP80101612A 1979-04-12 1980-03-26 Niederspannungs-Lastschalter mit Sicherung Expired EP0017819B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101612T ATE4259T1 (de) 1979-04-12 1980-03-26 Niederspannungs-lastschalter mit sicherung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2915170 1979-04-12
DE2915170A DE2915170C2 (de) 1979-04-12 1979-04-12 Niedersapnnungs-Lastschalter mit Sicherung

Publications (2)

Publication Number Publication Date
EP0017819A1 EP0017819A1 (de) 1980-10-29
EP0017819B1 true EP0017819B1 (de) 1983-07-20

Family

ID=6068324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101612A Expired EP0017819B1 (de) 1979-04-12 1980-03-26 Niederspannungs-Lastschalter mit Sicherung

Country Status (5)

Country Link
EP (1) EP0017819B1 (es)
JP (1) JPS55146835A (es)
AT (1) ATE4259T1 (es)
DE (1) DE2915170C2 (es)
ES (1) ES490471A0 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934149C2 (de) * 1979-08-23 1983-04-07 Siemens AG, 1000 Berlin und 8000 München Niederspannungs-Lastschalter mit Sicherung.
DE3027561A1 (de) * 1980-07-21 1982-02-25 Siemens AG, 1000 Berlin und 8000 München Niederspannungs-lastschalter mit sicherung
DE3545526A1 (de) * 1985-12-20 1987-06-25 Siemens Ag Installationseinrichtung mit ueberspannungsableiter
AU2005285103B2 (en) * 2004-09-13 2010-01-28 Eaton Intelligent Power Limited Fusible switching disconnect modules and devices

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE806461C (de) * 1948-10-07 1951-06-14 Mueller Jean Ohg Schraubkappe fuer elektrische Schmelzsicherungen
GB879669A (en) * 1958-06-07 1961-10-11 Bassani Spa Improvements in or relating to electric switches
FR1404511A (fr) * 1964-04-30 1965-07-02 Distributeur électrique de dérivations protégées avec cartouches fusibles
DE1297203B (de) * 1965-07-17 1969-06-12 Siemens Ag Schraubkappe fuer Schmelzeinsaetze in Sicherungselementen
US3474373A (en) * 1967-06-22 1969-10-21 Ite Imperial Corp Fuse holder including coordinated operating means between fuse insertion and an associated circuit breaker device
FR1549469A (es) * 1967-10-30 1968-12-13
FR1566805A (es) * 1968-04-02 1969-05-09
CH491492A (de) * 1969-05-22 1970-05-31 Schurter Ag H Berührungssicherer Sicherungshalter
DE7027698U (de) * 1970-07-23 1970-10-15 Zimmermann Kg Rudolf Schraubkappe fuer sicherungselemente.
IT988814B (it) * 1973-05-30 1975-04-30 Bassani Spa Dispositivo per il fissaggio di fusibili a cartuccia nei porta fusibili
DE2334595B1 (de) * 1973-07-07 1974-04-25 Lindner Gmbh Fabrik Elek Scher Mit einem Schalter versehener Sicherungssockel fuer Schmelzeinsaetze
DE2445262A1 (de) * 1974-09-21 1976-04-08 Bbc Brown Boveri & Cie Sicherungsschalter
DE2618360C3 (de) * 1976-04-27 1983-11-03 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Sicherungssockel mit eingebautem Schalter
DE2642223A1 (de) * 1976-09-20 1978-03-23 Schulte Elektrotech Abschaltbares schmelzsicherungselement
DE2722279C3 (de) * 1977-05-17 1981-07-23 Christian Geyer GmbH & Co, 8500 Nürnberg Sicherungsschalter

Also Published As

Publication number Publication date
DE2915170C2 (de) 1982-06-09
JPS55146835A (en) 1980-11-15
ES8101319A1 (es) 1980-12-01
ES490471A0 (es) 1980-12-01
DE2915170B1 (de) 1980-08-07
ATE4259T1 (de) 1983-08-15
EP0017819A1 (de) 1980-10-29

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