EP1096529A1 - Protective electrical circuit-breaker - Google Patents

Abstract

The construction of a high-speed circuit breaker is improved so as to allow for the universal use of auxiliary components that have an interface (91) for a circuit breaker bridge (90) operated by a transferring link (96) that uses a transfer ratio to transfer lifting motion acting on the circuit breaker bridge.

Description

The invention relates to an electrical protective switching device, in particular Motor protection switch, according to the preamble of claim 1.

Such a switching device is already known from DE 42 08 716 C2. This protective switching device also has an insulating housing with a Switching device and a tripping unit with a short-circuit sensitive electromagnetic quick release.

Known protective switching devices have a tripping bridge which can be actuated directly by a quick-action tappet.
Depending on the device size or current range, there is a different magnetic stroke for the quick release.
The use of auxiliary modules or accessories, so-called AGM modules (trip sensors), which have an interface to the trip bridge, is not easily possible for larger sizes due to this different magnetic stroke.

The invention has for its object a generic switching device to create, which is so improved in its structure that a universal use of auxiliary modules that provide an interface to the Have trigger bridge is possible.

Starting from a protective switching device of the type mentioned at the beginning Task according to the characterizing features of independent claim solved during the dependent claims advantageous developments of the invention can be found.

The invention makes it possible to build auxiliary modules from smaller device series to use. This lowers development, production and storage costs.

Figur 1:

ein Schutzschaltgerät gemäß der Erfindung in Perspektivansicht;

Figur 2:

die Auslöseeinheit des erfindungsgemäßen Schutzschaltgerätes in Explosionsdarstellung;

Figur 3a:

einen auswechselbaren Aufnahmekörper mit Magnetanker und Federelement in Explosionsdarstellung;

Figur 3b:

eine Schnittdarstellung des Aufnahmekörpers entlang der Linie A-A in Fig. 3a;

Figur 3c:

eine Schnittdarstellung des Aufnahmekörpers entlang der Linie B-B in Fig. 3a;

Figur 4:

eine vormontierte Auslöseeinheit mit separatem vormontierten Aufnahmekörper; und

Figur 5:

ein Schaltgerätegehäuseteil mit eingebauter Auslöseeinheit und separatem vormontierten Aufnahmekörper.

Figur 6:

eine Darstellung des Magnetankers von einer Seite ;

Figur 7:

eine Darstellung des Magnetankers von einer anderen Seite;

Figur 8:

eine Schnittdarstellung des Magnetankers;

Figur 9:

eine andere Schnittdarstellung des Magnetankers;

Figur 10:

eine Schnittdarstellung des Schnellauslösers;

Figur 11:

eine vergrößerte Schnittdarstellung des Auslösebereichs Schnellauslösers.

Further details and advantages of the invention result from the subclaims and the following exemplary embodiment explained with reference to figures. Show it

Figure 1:

a protective switching device according to the invention in perspective view;

Figure 2:

the release unit of the protective switching device according to the invention in an exploded view;

Figure 3a:

an exchangeable receiving body with magnetic armature and spring element in an exploded view;

Figure 3b:

a sectional view of the receiving body along the line AA in Fig. 3a;

Figure 3c:

a sectional view of the receiving body along the line BB in Fig. 3a;

Figure 4:

a preassembled release unit with a separate preassembled receiving body; and

Figure 5:

a switchgear housing part with built-in release unit and separate pre-assembled receptacle.

Figure 6:

a representation of the armature from one side;

Figure 7:

a representation of the magnet armature from another side;

Figure 8:

a sectional view of the magnet armature;

Figure 9:

another sectional view of the magnet armature;

Figure 10:

a sectional view of the quick release;

Figure 11:

an enlarged sectional view of the trigger area quick release.

1 shows an electrical protective switching device 1, in particular Motor protection switch, with a rotary drive and a rotary head 11 for on and Switch off and display the trip in the event of overload or short circuit and with a housing 12 which is divided into three housing parts 13, 14, 15. The middle one Housing part 14 has cable entry openings 16 with cable clamps 17.

2 shows the release unit of the invention Circuit breaker in an exploded view. The includes Trigger unit a parts carrier 5 to which a connector 6 can be attached. The parts carrier 5 advantageously consists of a thermoplastic.

The connector 6 is made of copper and is L-shaped, the lower outward leg 18 being provided as a contact tap for the cable clamp 17.
The parts carrier 5 has a fixing pin 23 which projects into a corresponding recess on the lower leg 18 of the connector 6.

The upper leg 21 is provided with a connecting zone 19 for connecting an overcurrent or bimetal release 9. In this case, a heating conductor 22 is connected to the connecting piece 6, in particular by means of a plasma or inert gas welding connection, via the connecting zone 19. For this purpose, the heating conductor 22 is placed in a known manner spirally around a bimetal 8 and connected to the bimetal 8 at its other free end, preferably likewise by means of a plasma or inert gas welding connection.
Due to the inert gas welding connection between the copper and the bimetal 8, which is very difficult to weld, a secure connection is established, which eliminates quality problems in this regard.
With the shielding gas or plasma welding, the heating element 22 is welded to the passive side of the bimetal 8. The passive side of the bimetal 8 is well suited for welding, because only the active side consists of an alloy that is relatively difficult or impossible to weld.

The lower end of the bimetal 8 is vertically connected to a yoke plate 28 on an outwardly bent tongue 33.
The yoke plate 28 consists of an essentially U-shaped area with two parallel side legs 29, 31 and a cross leg 30 connecting them, which hold the quick release 10, a fastening section 32 which is integrally connected at right angles to the second leg 31 and a tongue 33.

On the fastening section 32, a fixing tab is arranged, which in a elongated, provided with fixing knobs, locking opening of the parts carrier 5 intervenes. As a result, the yoke plate 28 is fastened in the parts carrier 5.

To the fastening section 32 of the yoke plate 28 is a, substantially L-shaped contact element 7 with one of its leg parts arranged in parallel.

The trigger coil 38 of the quick release 10 is one end of the coil the contact element 7 and with its other coil end with the yoke plate 28 connected to the fastening section 32. The connection is also made preferably by inert gas or plasma welding.

The parallel to the mounting portion 32 leg portion of the Contact element 7 is partially provided with recesses in order to Parts of the yoke plate 28 interlock. This will be extreme built to save space.

A slot motor 47 is preassembled in the lower region of the parts carrier 5.

In a particularly preferred embodiment, the trigger unit only fixed by gluing in the housing 12 (i.e. without Screwing, locking, bracing or the like). As special Suitable glue points have extensions on the live ones Share proven. In the illustrated embodiment, there are at least one first adhesive extension K1 on the connecting zone 19 of the connector 6, a second adhesive extension K2 on the tongue connected to the yoke plate 28 33 and a third and fourth adhesive extension K3, K4 on the yoke plate 28 itself, in Corner area of side leg 29 and cross leg 30, arranged.

The current flow in the parts arranged on the parts carrier 5 is from the lower leg of the connector 6 to the weld Connection zone 19 / heating element 22, then into heating element 22 up to the welded connection heating element 22 / bimetal 8, then via the bimetal 8 up to the weld joint bimetal 8 / yoke plate 28, then over the fastening portion 32 of the yoke plate 28 to the Welded connection fastening section 32 / tripping coil 38, then over the winding of the trip coil 38 to the welded joint Tripping coil 38 / contact element 7 in the contact element 7 for Continuation of the current via that with the contact element 7 interacting movable contact element.

3a shows a preassembled unit with a receiving body 60, a Magnetic armature 62 and a spring element 64 in an exploded view.

The magnet armature 62 has a first part MA ₁ , a second part MA ₂ , and a third part MA ₃ , the second part MA _{2 being arranged} between the first part MA ₁ and the third part MA ₃ .

The magnet armature 62 is essentially rod-shaped, with its lower part MA ₁ having an almost square cross-section and its upper part MA _{2 being designed} as a pin-shaped extension with a significantly smaller and in particular circular cross-section. The upper part MA _{2 is} advantageously not arranged centrally, but offset from the center axis of the armature 62. At its free end, the upper part MA _{2 is expanded} by a preferably plate-like head piece 63. The magnet armature 62 consists of a magnetizable material.
The magnet armature body (with the exception of the head piece 63) can, for example, be easily turned from a square profile. By centering the material in the central axis of the square profile, the lower part MA ₁ and, when centering the material from the center of the profile, the upper part MA _{2 can be} manufactured (eg by turning on a lathe).

The receiving body 60 consists of insulating material and serves to receive the Magnet armature 62 and the spring element 64. The magnet armature 62 is longitudinally movable in the, essentially tubular, Mounted body 60. By the spring element 64, which is preferably designed as a torsion spring and also in, respectively is arranged on the receiving body 60, the magnet armature 62 is opposite its direction of release movement (here: downward) with a spring force acted upon. For this, the torsion spring is supported with one free end from an abutment 66 of the receiving body 60. With her other free At the end, the torsion spring engages behind the head piece 63 of the armature 62 and hereby applies a spring force against it Release direction of movement.

The end of the spring element 64, which engages on the head piece 63, engages in a free area 80 of the second part MA ₂ in the vicinity of the center axis of the magnet armature 62. In the free area 80 of the second part MA ₂ , in the vicinity of the axis center of the magnet armature 62 also a trigger element 81 of a trigger bridge is arranged. The trigger element 81 is hook-shaped.

The receiving body 60 consists essentially of a lower, tubular section I and a head section II.

The section I serves in its upper part I ₁ for guiding the magnet armature 62 and in its lower part I ₂ for fastening within the quick release device 10. In its upper part I ₁ the receiving body 60 has an adaptation to the lower part MA _{2 of} the magnet armature 62 the wall cross-sections narrowing (according to FIG. 3b). In its lower part I ₂ , which is open at the edge, the receptacle body 60 is designed in its interior to match the cross section of the magnet armature 62, in particular circular (FIG. 3 c).

To mount the magnet armature 62 in the receiving body 60, the magnet armature 62 is inserted with its head piece 63 first, from below into the lower part I _{2 of} the receiving body 60. In a preassembled rest position, the magnet armature 62 is biased within the receiving body 60 by a free end of the torsion spring which engages under the head piece 63 of the magnet armature 62, counter to the direction of release movement. Here, the magnet armature 62 is limited in its displacement against the direction of release movement by the transition plane MA _Ü formed between the upper and lower part of the magnet armature 62, which interacts with an in particular annular abutment inside the receiving body 60. In this way, the magnet armature 62 mounted in the preassembled unit (60, 62, 64) is movably mounted between the described rest position and a release position located in the direction of release movement. The trigger position is reached when a certain magnetic field strength and thus at a certain short-circuit current level is reached in that the magnet armature 62, which is mounted in a longitudinally movable manner, and the fixed magnetic core 68 are magnetized by the generated magnetic field and attract each other by the magnetic effect. The displacement path of the magnet armature 62 that can be achieved at a specific current strength and the spring force with which the magnet armature 62 is biased against the direction of the movement of the release movement interact. The dimensioning of the torsion spring allows the limit current at which the quick release 10 is to be triggered to be adjustable. For the triggering process, the magnet armature 62 acts (strikes) on an impact armature 69, which is guided in regions in the magnet core 68.

According to Figure 4, the receiving body 60 for attachment to the quick release 10 with its lower open end of section I through an opening 29a of the side leg 29 on the magnetic core 68 of the quick release 10 detachably attached (non-positive). This will make it easy Interchangeability of the preassembled unit consisting of a holder 60, armature 62 and spring element 64 guaranteed. This has one easier assembly and a simplified dimensioning of the Switching devices with regard to their response values for short-circuit currents. So that the unit 60, 62, 64 is fixed against rotation in the short-circuit release 10, have the receiving body 60 and the side leg 29 corresponding Anti-rotation means 70, 71. For this purpose, the receiving body 60 preferably with a circumferentially arranged outward Fixation extension formed, while the side leg 29 in his Opening 29a cooperates with the fixation extension Has recess.

As can be seen in FIG. 11, the trigger element 92 is one Translation member 96 is actuated, which on the release bridge 90th effective stroke movement due to a gear ratio of less than 1: 1 transmits. This means that the stroke movement of the magnet armature can be greater than the lifting movement actually required. The to interface 91 for stroke movement acting on the auxiliary module is reduced

The translation member 96 is a spring end of the spring element 64 trained operating lever 93.

The actuating lever 93 is located at one end of its actuating end 94 Head piece 63 of the armature 62 under spring action, which Tripping element 92 is operatively connected to an actuation point 95 and wherein the operating point 95 of the operating lever 93 between the Actuating end 94 and the fulcrum 97 is arranged.

The invention makes it possible to reduce the angular position in such a way that that the effective distance of the interface is reduced from 6mm to 4.2mm becomes. The release bridge has a pivotable tongue that the Trip message indicates. The distance is the stroke that the tongue executes.

Reference list

Switchgear

1

Parts carrier

5

Connector

6

Contact element

7

Bimetal

8th

Overcurrent release

9

Quick release

10th

Turret

11

casing

12th

Housing parts

13, 14, 15

Cable entry openings

16

Cable clamp

17th

lower leg

18th

Connection zone

19th

upper leg

21

Heating element

22

Fixing pin

23

Yoke sheet

28

Side thighs

29, 31

Cross leg

30th

Fastening section

32

tongue

33

Trip coil

38

Receiving body

60

Magnetic anchor

62

Headpiece

63

Spring element

64

Abutment

66

Magnetic core

68

Impact anchor

69

Anti-rotation device

70, 71

free area

80

Release element

81

Release bridge

90

interface

91

Release element

92

Operating lever

93

Actuation end

94

Actuation point

95

Translation link

96

Fulcrum

97

Claims (10)

Electrical protective switching device (1), in particular motor protective switch, with a housing (12) made of insulating material, a switch contact arrangement, a tripping unit with an electromagnetic quick release (10) comprising a tripping coil (38), a magnetic core (68), a magnetic armature (62), wherein the magnet armature (62) is mounted in a longitudinally movable manner in a receiving body (60), a spring element (64) for the quick release (10), an impact armature (69), a release bridge (90) which acts on a switch lock and can be actuated by the magnet armature (62) with a release element (92), and an interface (91) for an auxiliary module connected to the release bridge (90),
characterized in that the release element (90) can be actuated by a transmission element (96) which transmits the lifting movement acting on the release bridge (90) by a transmission ratio of less than 1: 1. Electrical protective switching device according to claim 1, characterized in that the transmission element (96) is an actuating lever (93) designed as a spring end of the spring element (64). Electrical protective switching device according to claim 2, characterized in that the spring element (64) is a torsion spring. Electrical protective switching device according to one or more of the preceding claims 2 or 3, characterized in that the actuating lever (93) rests at its actuating end (94) on a head piece (63) of the magnet armature (62) under spring action and in that the trigger element (92) also is operatively connected to an actuation point (95), the actuation point (95) of the actuation lever (93) being arranged between the actuation end (94) and the lever pivot point (97). Electrical protective switching device according to one or more of the preceding claims, characterized in that the magnet armature (62) has a first part (MA ₁ ), a second part (MA ₂ ), and a third part (MA ₃ ), that the second part ( MA ₂ ) is arranged between the first part (MA ₁ ) and the third part (MA ₃ ), that the second part (MA ₂ ) is designed as a pin-shaped extension with a significantly smaller cross section than the first part (MA ₁ ), that the second part (MA ₂ ) is not arranged centrally, but offset from the center of the axis of the magnet armature (62), that the third part (MA ₃ ) is designed as a head piece (63) on which the spring element (64) is supported, that Spring element (64) is arranged at least partially in the region of the second part (MA ₂ ) and that the third part (MA ₃ ) is designed as a plate-like head piece (63). Electrical protective switching device according to the preceding claim, characterized in that the first part (MA ₁ ), the second part (MA ₂ ) and the third part (MA ₃ ) are integrally connected to form a single magnet armature body, in that the second part (MA ₂ ) of the magnet armature body is rotated from a square profile in such a way that the center axis of the square profile is offset from the center of the profile during centering. Electrical protective switching device according to one or more of the preceding claims 5 or 6, characterized in that the spring element (64) is arranged in or on the receiving body (60), the magnetic armature (62) acting against its direction of release movement with a spring force, which is Spring element (64) is supported with its free end on an abutment (66) of the receiving body (60), and that the spring element (64) engages with its other free end a head piece (63) of the magnet armature (62) and the magnet armature (62) is thereby acted upon by a spring force against its direction of release movement. Electrical protective switching device according to one or more of the preceding claims 5 to 8, characterized in that the end of the spring element (64) which engages on the head piece (63) points to a free area (80) of the second part (MA ₂ ) in the vicinity of the center of the axis of the magnet armature (62) engages and that a release element (81) of a release bridge (90) is arranged on a free area (80) of the second part (MA ₂ ), near the center of the axis of the magnet armature (62). Electrical protective switching device according to one or more of the preceding claims, characterized in that the trigger element (81) is hook-shaped. Switching device according to one or more of the preceding claims, characterized in that the magnet armature (62) in its lower part (MA1) and the receiving body (60) in its part (I1) guiding the lower part (MA1) are designed to match one another are that the magnet armature (62) is guided non-rotatably in the receiving body (60).

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