EP1760748A2 - Electrical switching device - Google Patents

Abstract

The electro mechanical circuit breaker switch has an assembly with a front panel having locating points for the linkage mechanism. A switch lever [19] is bearing mounted and the lower end connects to the linkage [24,27,34,50] coupled to the contacts [38,39]. The contact opening is triggered by a thermal bimetallic strip [52]. An electromagnetic actuator [46] responds to a short circuit condition.

Description

The invention relates to an electrical switching device according to the preamble of claim 1.

In particular, the invention relates to a circuit breaker used to shut down loads in the event of a short circuit or overcurrent. Of course, the invention can also be applied to motor protection switches and RCCBs.

A circuit breaker has in its interior an electromagnetic actuator having a plunger armature electromagnet with a core and a movable armature around which a coil is wound. In the case of a short circuit, the armature moves and on the one hand strikes the contact lever, so that the contact point is opened quickly; On the other hand, it also causes a permanent opening of the contact point via a switching mechanism. The thermal release, which is usually designed as a bimetallic release, acts on the switch lock exclusively to the permanent opening the contact point. The bimetal is usually designed as a strip, which bends due to the different expansion coefficients of the interconnected metals. Of course, instead of a bimetallic strip, a strip made of a shape memory alloy can also be used.

In the switch S2 ABB Stotz Kontakt GmbH, Heidelberg, the switch lock between two boards is mounted, which are connected to each other and also have the bearings for the corresponding, the Verklinkungsstelle forming components or contain. In this switch, the electromagnetic actuator is located between the bimetallic strip and the contact lever, i. the contact lever is on one side and the bimetallic strip on the other.

The object of the invention is to further improve a switch of the type mentioned, in particular to simplify the assembly considerably.

This object is achieved by the features of claim 1.

The invention is therefore characterized in that the contact carrier for the movable contact piece between the thermal and the electromagnetic release is that the latch lever with a rotatably mounted, cooperating with the electromagnetic actuator and the thermal release trigger lever forms the Verklinkungsstelle, and that the thermal Trigger is coupled by means of a contact carrier cross-connecting rod with the release lever, so that both the thermal and the electromagnetic release in an over and / or short-circuit current open the Verklinkungsstelle, and that a rotatably mounted hammer is provided, on the one hand by the thermal release and on the other hand, is pivotable by the electrical release and when triggered the release lever in the direction of unlatching the Verklinkungsstelle pivoted.

According to a particularly advantageous embodiment of the hammer is a Doppelarmhebel, the axis of rotation between Verklinkungsstelle and electrical release is arranged, wherein the first arm cooperates with the latch lever and the second arm with the thermal and magnetic trigger.

According to another embodiment, the second arm may cover the armature of the electromagnetic release.

Advantageously, the axis of rotation of the hammer is fixed on a line which is formed by the bearing points of the trigger or impact lever and the control handle, this line is approximately perpendicular to the mounting plane or to the front wall.

Further advantageous embodiments and improvements of the invention can be found in the further subclaims.

Due to the configuration of the invention, the vote between unlatching before striking the contact lever is significantly improved, since the tolerance chain has been shortened compared to that of the previous switch lock in the switch S2 of the company ABB Stotz contact GmbH, Heidelberg, considerably. The vote is in one part in the release lever. The striker hits on the release lever which moves until the unlatching and only then occurs on the movable contact carrier to the opening.

Reference to the drawing, in which an embodiment of the invention is shown, the invention and further advantageous refinements and improvements of the invention and other advantages will be explained and described in detail.

Fig. 1

eine Teileinsicht in ein Schaltgerät, in Ausschaltstellung,

Fig. 2

eine der Fig. 1 entsprechende Teilansicht, in Einschaltstellung,

Fig. 3 und Fig. 4

je eine Ansicht, die den in Figuren 1 und 2 dargestellten Ansichten des Schaltgerätes entsprechen, bei Beginn der Auslösung und beim Ende der Auslösung, wobei die

Show it:

Fig. 1

a partial view into a switching device, in off position,

Fig. 2

1 corresponding partial view, in closed position,

FIG. 3 and FIG. 4

each one view, which correspond to the views of the switching device shown in Figures 1 and 2, at the beginning of the triggering and at the end of the triggering, wherein the

4 shows the views according to FIGS. 1 and 2 and FIG. 3 shows a corresponding view from the back of the views shown in FIGS. 1 and 2.

Reference is made to FIG. 2.

A circuit breaker 10, which is partially visible in the area of its switching mechanism, has a housing 11, which is composed of a cup-shaped housing lower part and a cup-shaped housing upper part. In the view according to Figures 1 and 2, the lower housing part can be seen; in the figures 3 and 4, only the rear derailleur is shown as such with a part of the contact lever, wherein the housing 11 is omitted. In addition, Fig. 3 shows the rear view of the rear derailleur for clarity.

The housing is of a pedestal type and has a front front wall 12, two rear front walls 13 and 14, not fully shown in the drawing, two front side walls 15 and 16 connecting the front front wall 12 to the rear front walls; Parallel to the front front wall or the rear front walls 13, 14 is a downwards the housing final mounting wall, which is not shown in the figures 1 to 4 and which is not relevant to the invention.

The front front wall 12 has an approximately semicircular bulge or protrusion 17, in the region of a bearing 18, a switch knob 19 is mounted. The switch knob 19 is a double-arm, with a handle 20 and a located inside the switching device eye-shaped projection 21; in the eye-shaped extension 21, a passage opening 22 is introduced; the center of the passage opening 22, the center of the bearing 18 and the center line of the control handle 20 are in line or aligned with each other.

The switching handle 20 protrudes from an opening 23 in the protrusion 17 out.

In the opening 22, a leg (not shown) of a bracket 24 is inserted, which has a U-shape, wherein the web 25 of the bracket in the figures 1 to 4 is visible. Of the other leg of the U-shaped bracket 24 engages in an opening 26 of a tab 27 and in a slot 28 of a ratchet lever 29 and is guided therein. The switching device further comprises a release lever 100 which is rotatably mounted about the axis 18 of the control handle 19. At this trigger lever 100 is a recess 101 which forms the Verklinkungsstelle with a locking lug 30 on the pawl lever 29. The locking lug 30 on the pawl lever 29 is integrally formed on the end of the pawl lever 29, which opposite to the tab 27 (see FIG. 2) is opposite, ie at the opposite end of a hinge axis 33 between a contact lever 34 and the tab 27. The latching is accordingly in Denoted below by the reference numerals 30/101, see below. The other end of the tab 27 is pivotally connected by means of the hinge axis 33 with the contact lever 34, which has approximately centrally a slot 35 with which it is rotatably mounted on a stationary pin 36 in the housing 11. As a result, the contact lever 34 becomes a double-arm lever, whose lever axis 37, which is opposite to the hinge axis 33, carries the so-called movable contact piece 38, which cooperates with a fixed contact piece 39. The latch lever 29 is rotatably mounted at its latching point 30, 101 opposite end via a pin assembly 40 in the housing (both in the lower housing part and in the upper housing part).

The arrangement is made such that the tab 27 and the latch lever 29 are approximately in line. In the closed position, in which the nose 30 rests against the recess 101, the switching mechanism is in the closed position, ie when the movable contact piece 38 contacts the fixed contact piece 39, in a first stable position, in which the central axis of the web 25 laterally in the embodiment of FIG. 2 on the left, next to the central axis of the bearing or the pivot bearing 18 of the switch knob 19 passes, so that the central axis of the leg 25 with the line formed by the central axis of the opening 22 and the central axis of the bearing 18 a blunt line Angle occupies that is open in the direction of Verklinkungsstelle 30/101. The tab 27 and the latch lever 29 are approximately parallel to the front front wall. In the closed position, the bracket 24 pushes the tab away from the latching point 30/101, so that the resulting force generates the switch-on force. The slot 35 lays down with its end, which on the side of the contact lever 34, on which the movable contact piece is located at. The slot 35 extends approximately perpendicular to the longitudinal extent of the contact lever 34th

Below the axis of rotation 18, that is between the axis of rotation 18 and the electromagnetic release 46, on a line which is approximately perpendicular to the mounting plane through the axis 18 and 103. The hammer 102 has a first arm 104, which extends into the region of the trigger lever 100 and cooperates with a nose 105, see also Fig. 3. The hammer 102 further has a second lever 106 which projects approximately to the mounting plane and with its end the Striker 48 covered. The arm 104 projects toward the front wall 12, and the arm 104 and the arm 106 form a Z-shape with each other, and the end portions of the arms 104 and 106 are approximately parallel to each other.

At the free end of the arm 106, an end 49 of a connecting rod 50 is connected, hinged here, which by means of a pin 51, which projects perpendicular to the plane in this and therefore only shown in broken lines, behind a bimetallic strip 52, which is the thermal release, attacks. Thus, the thermal release 52 is located between the pin 51 and the portion 106th

The longitudinal axis of the connecting rod 50 extends approximately perpendicular to the longitudinal extent of the bimetallic strip; in the embodiment according to FIGS. 1 to 4, the longitudinal extent of the bimetallic strip 52 with the fastening side forms an acute angle, which is open towards the electromagnetic release.

Between the left narrow side wall 15, so the wall which is adjacent the hinge 33, and the contact lever in the region between the hinge point 33 and the slot 35, a compression spring 53 is provided which acts on the contact lever clockwise about the bearing 36, so that the Compression spring 53, the switch-off, so that movement of the contact lever 34 from the position shown in FIG. 2 in the position shown in FIG. 1, supported.

If now due to a short-circuit current of the percussion armature 48 moves in the direction of arrow P, it presses on the arm 106 and pivots the hammer 102 in this case the axis of rotation 103 in the clockwise direction, whereby the Verklinkungsstelle 30/101 is unlatched, see Fig. 3, so that the pawl lever 29 can pivot about its axis in a clockwise direction. In this case, the leg of the bracket 24 received in the opening 26 of the tab 27 slides in the slot 28 until it has reached the opposite, shown in Fig. 1 to 4 left end of the slot 28. As a result, the force of the spring 53 is released; the end of the elongated hole 35, which is opposite to the side of the contact lever, at which the movable contact piece 38 is located, bears against the stationary pin 36, so that the compression spring 53 can also pivot the contact lever 34 in the counterclockwise direction; The switching lever or knob 19 is thereby released and can rotate in the off position counterclockwise about the axis 18, which by a spring assembly 107th. In the position shown in FIG (see Fig. 4) is achieved. In this case, the slot is the bracket 24 free, so that the switch knob in the off position shown in FIG. 1, in which he passes with his nose 30 back behind the recess 31 of the hammer, is pulled. Now, a reclosure of the switch can be done by the switching handle 19 is moved from its off position clockwise in the closed position shown in FIG.

If at a short-circuit current, the thermal release 52 bends, then the free end bends approximately in the direction of arrow P and thereby takes over the rod or connecting rod 50 the portion 100 of the hammer with, whereby the return 101 of the nose 30 and thereby removes the Latching is opened. The beginning of the triggering is again shown in FIG. 3; the further procedure is the same as that described above.

Of course, the switch lock described with reference to a circuit breaker can also be used in a residual current circuit breaker; In this case, instead of the electromagnetic release 46, which responds to short-circuit current, a trigger should be used which responds to a fault current.

Of course, it is also possible to use the switch lock for a motor protection switch, in which instead of a contact lever provided a contact carrier is, which carries a contact bridge, which in the ON state two fixed contacts, so a pair of contact pieces, electrically conductively connects.

At the release lever 100 is a ramp be 108, against the extension of the projection 109 of the tab 27 comes to a stop during the triggering, which is clearly apparent from Fig. 4. As a result, the release lever, which is optionally coupled to a release lever in an adjacently arranged circuit breaker is further pivoted to its triggered position, so that the release lever is safely spent in the adjacent circuit breaker in its release position, so that there also the triggering process proceeds as described above.

Claims (5)

Electrical switching device, in particular line, motor or residual current circuit breaker, with a thermal release, with an electromagnetic release, with a switching mechanism with a Verklinkungsstelle and at least one contact point, which is permanently opened or closed by means of the switching mechanism, with a control handle by means of a Coupling element is connected to one end of a tab whose other end is coupled to a contact carrier carrying the movable contact piece, and with a latch lever which forms the Verklinkungsstelle with a release lever, characterized in that the contact carrier for the movable contact piece between the thermal and the electromagnetic release is that the latch lever with a rotatably mounted, cooperating with the electromagnetic release and the thermal release trigger lever forms the Verklinkungsstelle, and that the thermal release by means of a the contact carrier cross-connecting rod is coupled to the release lever, so that both the thermal and the electromagnetic release in an over- and / or short-circuit current open the Verklinkungsstelle, and that a rotatably mounted hammer is provided, on the one hand by the thermal release and the other by the electric Trigger is pivoted and pivoted when triggered the release lever in the direction of unlatching the Verklinkungsstelle. Switching device according to claim 1, characterized in that the hammer is a double-arm, whose axis of rotation between Verklinkungsstelle and electrical release is arranged, wherein the first arm cooperates with the latch lever and the second arm with the thermal and magnetic trigger. Switching device according to claim 1 or 2, characterized in that the second arm covers the armature of the electromagnetic release. Switching device according to claim 3, characterized in that the axis of rotation of the striking lever is fixedly located on a line which is formed by the bearing points of the release lever and the control handle, said line being approximately perpendicular to the mounting plane or to the front wall. Switching device according to one of the preceding claims, characterized in that a spring arrangement (63) is provided, which constantly acts on the hammer so that it sends the impact armature of the solenoid system at the end of a trip to its triggering ready position, whereby the Verklinkungsstelle is latched again.

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