DE1060973B - Magnetic overcurrent release with armatures arranged next to one another for instantaneous and briefly delayed release - Google Patents

Description

Electrical circuit breakers are often provided with combined overcurrent releases, which in the event of overcurrents respond with a certain time delay, while short circuits are switched off without delay will. It is known for this purpose a magnet with two arranged side by side To equip anchors, one of which acts directly on the release, while the other with is provided with an escapement. In the case of such combined magnetic overcurrent releases, side by side arranged anchors works provided that the dimensions and arrangement are the same these two anchors in the non-attracted state have the same magnetic attraction force on both anchors. If, on the other hand, one armature, namely the armature for delayed overcurrent release, has tightened, it will the stray field acting on the other armature for instantaneous short-circuit release is reduced, see above that the tightening force decreases relatively. The restoring force must also respond to this reduced tightening force this short-circuit anchor must be measured. There is therefore a risk that this anchor for instantaneous short-circuit tripping already responds to overcurrents that are below the value at which an instantaneous rapid tripping should take place, if the armature for delayed overcurrent tripping has not previously addressed.

To avoid this risk, special means are provided according to the invention by which the when the armature responds for the instantaneous short-circuit release to be overcome by it Force when tightening the armature for the delayed release is reduced. This makes it possible the force acting on the armature for instantaneous quick release when the armature is not tightened for delayed Keep tripping so large that an undesired premature response of the short-circuit armature is avoided.

The invention will be explained in more detail with reference to the drawing, in which an embodiment of a such magnetic overcurrent release is shown.

Fig. 1 shows the arrangement in front view, while

FIG. 2 shows the system of the briefly delayed magnetic release according to a section II-II of FIGS. 1 and

Fig. 3 shows the instantaneous short-circuit release according to the section III-III of Fig. 1;

Fig. 4 shows the arrangement of the escapement for the briefly delayed magnetic release and

5 shows a view of the arrangement from below.

In Figs. 1 and 5, only the release device for one pole is shown. In a common However, housing can also be one of the pole

Magnetic overcurrent release
with armatures arranged next to each other for instantaneous and short-time delayed tripping

Applicant:

Siemens Sctiuckertwerke
Corporation,
Berlin and Erlangen,
Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Ing. Kurt Haese, Berlin-Halensee, has been named as the inventor

number of the switch corresponding number of identical elements are combined that work on a common trip shaft. At the core of the release magnet 1 with the excitation winding 2 , the two hinged armatures 3 and 4 are attached side by side, the first of which is provided with an inhibitor 5 (Fig. 4) for the time delay, while the second acts directly on the release shaft.

When the armature 3 is tightened for delayed release, the adjusting spring 7 is tensioned via a tab 6. At the same time, the lever 9 , which is mounted on the shaft 10 , is pivoted by a nose 8 on the bracket 6. In this case, an idle mode is provided between the nose 8 and the lever 9 , which allows the armature 3 to be tightened in a manner known per se independently of the delay device, solely depending on the level of the overcurrent according to the setting of the retraction force of the spring 7 . The idle travel between the nose 8 and the lever 9 can optionally be made adjustable by forming the nose 8 as an eccentric bolt. A lever is also attached to the shaft 10 (FIG. 4), at the other end of which a bracket 12 is articulated, through which the tension spring 13 for the escapement 5 is tensioned. Under the action of this spring 13 is then with the

909 560/345

Claims (3)

the escapement 5 set time delay via the intermediate levers 14 and 15 rotates the release half-shaft 16. The lever 18, which is influenced by the release force accumulator 17 and which, when released, causes the switch to be switched off, is supported in a manner known per se against this half-wave. The armature 4 for instantaneous short-circuit tripping (FIG. 3), on the other hand, acts directly on the lever 19, which is also arranged on the tripping half-shaft 16. When the armature 4 is tightened, the release shaft 16 is thus rotated clockwise without delay, so that the release lever 18 loses its support. In order to prevent a premature tightening of the armature for instant short-circuit tripping when the armature is not tightened for delayed tripping, a lever 21 is arranged according to the invention in the illustrated embodiment on the bearing shaft 20 next to the armature 3 and between this and the armature 4 or its Continuation 22 a spring 23 is stretched. The lever 21 is supported with its free end against the shaft 10 actuated by the armature 3, which is provided with a milling 10 'at this point. A tightening of the armature 4 before the armature 3 responds is thus prevented by the fact that in this case the spring 23 is tensioned and thus the restoring force of the spring 24 is increased. If, on the other hand, the armature 3 pulls in and thus displaces the shaft 10, the lever 21 loses its support on it, and the spring 23 is relaxed. In order to latch the lever 21 to the shaft 10 again after the armature 4 has been tightened when it falls into the open position, a stop 25 is provided on the shoulder 22 of the armature 4, which keeps the lever 21 constantly spread at a certain angle. The invention is not restricted to the example described above. The constructive training can deviate from this as required. Furthermore, it may be useful to arrange a thermal overcurrent release in addition to the magnetic release with instantaneous and briefly delayed release, which, as indicated in the drawing at 26, z. B. via a release flap (Fig. 4) and an adjusting device 27 with room temperature compensation 28 on a lever 29 also attached to the release shaft 16 works. Claims. 1. Magnetic overcurrent release with armatures arranged next to one another for instantaneous and short-time delayed tripping, characterized by means by which the when the Armature for the instantaneous short-circuit release of this force to be overcome when tightening of the armature for the "delayed tripping" is reduced. 2. Magnetic overcurrent release according to claim 1, characterized in that on the Armature for instantaneous short-circuit release attacks an additional spring, the other end of which is supported against a latch, which for delayed release when the armature is tightened is resolved. 3. Magnetic overcurrent release according to claim 2, characterized in that the on the Armature for instantaneous tripping engaging spring attached to a lever at its other end is, which is mounted on the one hand on the bearing shaft of the armature and on the other hand against a half-wave actuated by the armature for delayed release is supported. Considered publications:
German patent specifications No. 818 378, 593 963. 1 sheet of drawings