EP1659604A2 - Switchgear for an electric installation - Google Patents

Abstract

The switchgear has an electromagnetic and or thermal strip, with the electromagnetic and thermal strips having an operable latch. A latch is provided, in case of a short-circuit or over current of the electromagnetic and thermal strip. A movable contact holder, is coupled with the latch which is provided in an open position, providing a switching toggle for the manipulation of the latch. The switching toggle is attached to U-shaped handles and a stationary housing section can slide into it. A release lever is led into the U- shaped handle with the stationary housing section. The release lever is provided with the U-shaped handle and the stationary housing section forms the latch.

Description

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

Such service switching devices are for example circuit breaker, residual current circuit breaker or motor protection switch, with which a short-circuit current, an overcurrent or a fault current, a shutdown is effected. A circuit breaker, which is to be considered here by way of example preferred, has a contact point consisting of a fixed and a so-called movable contact piece, which can be manually closed or manually and automatically opened. The movable contact piece is usually attached to a rotatable about a stationary axis contact lever at one end, at the other end of which a toggle linkage connects, which in turn is hingedly connected to the switch knob. The opening of the contact point is effected once by operating the switch knob, and on the other hand, a thermal release, with which an overcurrent, and an electromagnetic release, with which a short-circuit current can be switched off, provided. As a thermal trigger, a strip of a bimetallic or a shape memory alloy can be used become. The electromagnetic trigger usually comprises a yoke, a magnetic core, a magnet armature and a coil; in the event of a short circuit, the armature is attracted to the coil and, as shown below, actuates the contact lever with the movable contact piece.

The circuit breaker S2 distributed by the company ABB Stotz-Kontakt GmbH, Heidelberg, has a transmission provided with a latching point, which is arranged between two circuit boards; On this Verklinkungsstelle act on the one hand, a thermal release in the form of a bimetallic strip and on the other hand, an electromagnetic release, whereby after unlatching of this Verklinkungsstelle the movable contact piece is permanently spent in the open position. That when a short-circuit current of the electromagnetic release also acts directly on the contact lever, so that the contact point is opened very quickly to achieve an early current limit, is of minor importance here.

The arrangement of the switching mechanism between the two boards has the advantage that the switch lock can be pre-assembled with the boards and the contact lever as well as with the switch between the two boards rotatably fixed switching knob. On the other hand, some assembly steps are required to connect the individual parts and the boards together. For latching Verklinkungsstelle is provided with a nose and a return, so that when unlatching certain frictional forces must be applied to the sliding movement of the nose against the return.

A simplification of such a switching mechanism can be effected in that a toggle mechanism is provided between the contact lever and the switch knob, which is formed from two mutually pivotable parts, which occupy a first stable position in the on state together with the switch knob and the movable contact lever, the the trigger is spent on a dead center position in a second stable position, wherein in the second stable position, the contact lever and thus the movable contact piece is in the open position.

From EP 0 585 261 B1, such a rear derailleur of the type mentioned, has become known, in which the toggle mechanism is formed of a stretch lever and a round wire bow, wherein the stretch lever is connected to the switch knob; due to the point of attack of the trigger or possibly a release lever on the stretch lever value is placed on a particularly high dimensional accuracy to achieve a correct triggering, with additional measures must be taken to achieve a precisely defined leadership of all components on the knee lever for the switch.

In DE 10 2004 012 919.3 a switching mechanism for an electrical service switching device is described, which has a transmission that passes from its first stable position via a dead center in a second stable position, wherein on the handle a leg of a strap is hinged, the other Leg is pivotally connected to a tab which is articulated at the other with the contact lever. The release lever acts on the leg connected to the strap of the U-shaped bracket.

The object of the invention is to provide an installation device of the type mentioned, which is further simplified.

This object is achieved by the features of claim 1.

Thus, according to the invention, a leg of different lays having U-shaped bracket with its shorter leg is pivotally connected to the switch knob; the longer leg is hingedly connected to a tab and slides with its free end portion on a fixed housing portion and is guided, and the tab, the release lever and the longer leg with the housing portion form the Verklinkungsstelle.

Hereby, a so-called knee joint mechanism is created, which is further simplified in terms of assembly.

In an advantageous embodiment, the release lever is rotatably mounted on the Schaltknebeldrehachse and constantly acted upon by means of a spring arrangement in the direction Verklinkungsstellung.

In some service switching devices acts on the Verklinkungsstelle a slide, which is displaced by the electromagnetic and the thermal release in a short or overcurrent; In this case, the invention can go so that the slider forms the trigger part and thus is part of the Verklinkungsstelle.

A further advantageous embodiment of the invention can go to the fact that on the hinged to the contact lever tab a recess on the front side facing away from the longitudinal edge is provided, in which engages the longer leg of the bracket and is held therein in Verklinkungsstellung.

In this case, a pin may be provided on the trigger member, which cooperates with a projection on the tab, which is arranged at the hinge point of the tab on the contact lever opposite the free end on the other side of the recess.

Further advantageous embodiments of the invention can be found in the dependent claims.

Reference to the drawing, are shown in the two embodiments of the invention, the invention and further advantageous refinements and improvements of the invention and other advantages to be explained and described in detail.

Fig. 1

eine perspektivische Einsicht in einen Leitungsschutzschalter, in Einschaltstellung,

Fig. 2

den Leitungsschutzschalter gemäß Fig. 1 in Ausschaltstellung,

Fig. 3

den Leitungsschutzschalter gemäß den Figuren 1 und 2 in seiner Verklinkungsstelle, also in der Einschaltstellung, aus einer anderen Perspektive als diejenige gemäß der Fig. 1,

Fig. 4

den Leitungsschutzschalter gemäß den Figuren 1 bis 3 während des Entklinkungsvorganges,

Fig. 5

den Leitungsschutzschalter gemäß der Fig. 4 in einer gegenüber der Stellung gemäß der Fig. 4 zeitlich späteren Stellung,

Fig. 6

eine noch spätere Stellung des Leitungsschutzschalter gemäß Fig. 5 und

Fig. 7

eine weitere Ausführungsform des Leitungsschutzschalters in Ausschaltstellung.

Show it

Fig. 1

a perspective view of a circuit breaker, in closed position,

Fig. 2

the circuit breaker of FIG. 1 in the off position,

Fig. 3

the circuit breaker according to Figures 1 and 2 in its Verklinkungsstelle, ie in the closed position, from a different perspective than that shown in FIG. 1,

Fig. 4

the circuit breaker according to Figures 1 to 3 during the unlatching process,

Fig. 5

the circuit breaker according to FIG. 4 in a relation to the position shown in FIG. 4 temporally later position,

Fig. 6

an even later position of the circuit breaker of FIG. 5 and

Fig. 7

a further embodiment of the circuit breaker in the off position.

The invention will be explained below with reference to a circuit breaker. Of course, the invention can also be used on a fault current or on a motor protection switch.

Reference is now made to FIG. 1.

Fig. 1 shows a partial perspective view of a circuit breaker 10, the housing has a first housing shell part 11, which is set with a second housing shell part (not shown) together to form a single closed housing.

The circuit breaker 10 has some components that are not relevant here, namely the components of electromagnetic release and thermal release and the like, as well as terminals, arc extinguishing chamber and other parts are not shown in detail, since they are not relevant to the invention.

The housing shell part 11 has, as well as the entire housing, a front front side 12 in which an opening 13 is located, from which the switching handle 14 of a switch knob 15 protrudes. The switch knob 15 is pivotable about an axis 16. On the handle 14 diametrically opposite side, a projection 17 is formed, which has an eye-shaped opening 18, in which a leg 19 of a U-shaped bracket 20 is inserted, so that the U-shaped bracket 20 can rotate in the opening 18 , The other leg 21, see Fig. 3, of the bracket 20 is formed opposite the leg 19 extended; the free end of this other leg 21 projects approximately to the inner surface 22 of the housing shell part 11 and acts there with a stationary inclined surface 23 together so that the free end 21 a of the leg 21 can move on the inclined surface 23 and slide on it or on you are guided.

The circuit breaker 10 further has a pivotable about an axis 23 contact lever 24, which is designed as a double arm; on the front side remote arm 25, a movable contact piece 26 is formed, which forms the contact point 28 of the circuit breaker with a fixed contact piece 27. At the front near arm 29, a tab 30 is hinged. While the contact lever 24 extends approximately perpendicular to the front side 12, the tab 30 extends approximately parallel to the front side and forms an acute angle with her, which is open to the axis 16 out. The tab 30 has, as shown in Figure 4, on its frontally located longitudinal edge an approximately semicircular recess 31 whose dimensions are adapted to the leg 21; in the on state, ie in the state shown in FIG. 1, the leg 21 is fed in the recess 31st

To the axis 16 of the switch knob, a release lever 32 is further rotatably mounted, which has approximately radially an L-shaped Anformung 33, one leg 34 approximately perpendicular to the front side 12 and the other leg 35 is approximately perpendicular thereto at an angle to the front side 12 aligned , which is open towards the contact lever as an acute angle. On the arm 35, a pin 36 is formed perpendicular thereto against which in the on state, a projection 37 is located on the tab, which projection 37 formed on the recess 31 opposite end of the tab 30 is. This projection extends at an obtuse angle with respect to the longitudinal direction of the tab 30, which is open to the contact point.

The inclined surface extends at an acute angle to the front side, wherein the contact lever off-side end of the inclined surface is located closer to the front surface than the contact lever near end; the web of the bracket 20 forms with the connecting line V of the central axis of the opening 18 and the axis of rotation of the pivot lever 14 at an obtuse angle, the tip of this angle is directed towards the contact lever or on the side of the contact lever, based on the switch knob 14 and the bracket 20. The free end of the leg 35 with the pin 36 jumps to the contact lever, d. H. towards the contact lever, in front. This pin covers the projection, so that the projection 37 comes to rest against the pin 36, in the on state.

In the on state, therefore, the latch consists of the assignment of the leg 21 to the inclined surface 23 and the recess 31, insofar as the inclined surface 23 forms the abutment for the leg 21, see also Fig. 3.

If, due to an electromagnetic or thermal tripping operation, an elimination is to take place, see Fig. 4, then a trigger 40, see Fig. 2, which is in communication with the electromagnetic and thermal release, the release lever 32 counterclockwise direction of arrow G to the Axis 16 pivots, whereby the pin 36 bears against the projection 37 and this projection 37 pushes away, so that the tab 30 is also pivoted clockwise about its axis 30 a, with which it is articulated on the contact lever 24. As a result, the leg 21 can move freely on the inclined surface 23 and releases the tab 30, so that the tab 30 can move in the direction of the arrow P in the area of the axis 16 and the contact lever can pivot; at the same time, the switching handle also pivots in the direction of arrow G and thus reaches the off position, see Fig. 2. During this movement, the leg 21 of the bracket passes back into the recess 31 on the tab back, with the inner surface of the arm 35 against the leg 21st applied and so holds the leg within the recess 31, as shown in Fig. 2 can be seen. In a corresponding manner, this inside of the arm 35 has a suitable contour.

By the projection 37 of the trip lever 32 is further driven in the switch-off movement in the release position, so that on the release lever 32 release lever adjacent circuit breaker can also be operated.

Fig. 6 shows the return to the latch. If the handle has moved back due to the action of the return spring, the tab is also acted upon by the release lever of the return spring, the release lever presses the tab back into its closed position on the projection.

The embodiment according to FIG. 7 shows a further embodiment of the invention. Contact lever, tab and handle are the same. Within the switch is a slide corresponding to the slider 40 and actuated by the magnetic and thermal release; on the slide a pin 51 is formed, which corresponds to the pin 36.

Claims (5)

Installation switching device with an electromagnetic and / or thermal release, with a actuatable by electromagnetic and thermal release switch lock having a Verklinkungsstelle which is unlatched in the event of a fault current (short-circuit or overcurrent) from the electromagnetic and thermal release via a trigger member, and with a movable contact carrier which is coupled to the switch lock and is spent in unlatching the Verklinkungsstelle permanently in the open position, and a toggle for actuating the switch lock, characterized in that on the switch knob a leg of different length exhibiting U-shaped bracket with its shorter leg articulated is connected, that the longer leg is fixed to a tab and guided with its free end on a stationary housing section and slides on it, and that the tab, the release lever, the longer leg the U-shaped bracket is guided with the stationary housing portion and slides thereon, and that the tab, the release lever, the longer leg of the U-shaped bracket with the stationary housing portion form the Verklinkungsstelle. Service switching device according to claim 1, characterized in that the release lever is rotatably mounted on the Schaltknebeldrehachse and constantly acted upon by means of a spring arrangement in the direction Verklinkungsstellung. Installation switching device with a force acting on the Verklinkungsstelle slide, which is moved by the electromagnetic and thermal release in a short or overcurrent, according to claim 1, characterized in that the slide forms the trigger part and thus is part of Verklinkungsstelle. Installation switching device according to one of the preceding claims, characterized in that on the hinged to the contact lever tab a recess on the front side facing away from the longitudinal edge is provided, in which engages the longer leg of the bracket and is held therein in Verklinkungsstellung. Installation switching device according to one of the preceding claims, characterized in that on the trigger part a pin is provided which cooperates with a projection on the tab, which is arranged at the hinge point of the tab on the contact lever opposite the free end on the other side of the recess.

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