LU83136A1 - IMPROVEMENTS ON A MANUALLY CLOSED SAFETY CIRCUIT BREAKER AND MAGNETIC AND THERMAL UNLOCKING UNITS - Google Patents

Description

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Fr

The present invention relates to improvements made to a safety circuit breaker with high breaking capacity and with reduced overall dimensions, of the type described in Belgian patent N ° 635,412 of the applicant.

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This patent describes a safety circuit breaker with manual engagement and magnetic and thermal unlocking members, with contact opening obtained, in the case of a short circuit, by the action of a movable armature of an electromagnet. inserted in the concerned phase. This armature normally acts on the lever „<of a trigger to release a pawl secured to a shaft carrying movable contacts to dissociate corresponding fixed contacts (* ί pegging. The release of this pawl, by means of an element elastic return, solicits the contacts in their * j open position.

However, the high breaking capacity is in fact obtained by percussion of the same mobile armature of the electromagnet with the associated mobile contact connected elastically to the aforementioned shaft.

The percussion force is a function of the intensity of the short! i circuit. The higher it is, the greater the effort.

| · ’· ..... In patent 635,412, each pole of the circuit breaker is associated; at least one movable contact which is associated on the one hand with a magnetic unlocking member and on the other hand with a thermal unlocking member. Under these conditions, the opening of this movable contact 1, during a short-circuit of sufficient intensity, causes the simultaneous opening of the movable contacts associated with the other poles of the circuit breaker only by releasing the pawl secured to the shaft carrying all of the movable contacts.

The invention makes it possible to overcome this drawback, so that in the event of a violent short-circuit, the opening of a mobile contact associated with a pole of the circuit breaker simultaneously ensures the opening of the - 3 - if mobile contacts associated with the others poles of this same circuit breaker.

To this end, the invention proposes a safety circuit breaker with manual engagement and magnetic and thermal unlocking members, comprising at least one movable contact element associated with a pole of the circuit breaker, disposed on one end of a movable contact arm. the other end of which is rotatably mounted about a fixed axis, the circuit-breaker engaged state being ensured by a locking device which can be released following rotation around a fixed axis of a trip lever ,? one end of this lever supporting the free end of a retaining click prestressed by a spring, while the other end of this lever can be controlled by an electromagnetic tripping member, as well as by a thermal tripping member, characterized in that all the poles * of the circuit breaker are associated with at least one movable contact, and in that said tripping lever is common to all the poles of the circuit breaker, each pole being itself associated with a thermal tripping member and to an electromagnetic tripping member, each electromagnetic tripping member such as the movable assembly of an electromagnet coming into contact with said lever which itself comes into contact with all of the movable contacts to release them simultaneously from the contacts associated fixed.

Thus, the percussion force caused by the mobile equipment * of an electromagnetic trip member associated with a pole of the circuit breaker, is simultaneously transmitted to all the mobile contacts associated with the other poles of the circuit breaker. On the contrary, according to patent 635,412, each mobile unit came to strike directly and only the associated mobile contact.

Cû 1 λλ tin airanf saû / 4a 1 "λπ la r * nne4 * K, ttr, iM r \ n - 4 - ·" · t trigger transmits the impact force to all moving contacts simultaneously * Obviously, each movable contact is associated with a thermal and magnetic trip member as described in patent 635,412.

Other advantages of the invention will become apparent during the description which follows, with reference to the appended figure, given solely by way of example and in which the circuit breaker according to the invention is represented in a simplified perspective view *, The manual closing (position I) and opening (position 0) control is obtained using a lever 1 and a conventional 1st lever 2 "A retaining pawl 3 is articulated on a pivot 4 which is fixed to the end of a lever 5 secured to a shaft 6 and cooperating with a return spring 16. This shaft 6 rotates at least two arms 100. More precisely, each end of each arm 100 is made integral with the shaft 6, while the other end of each arm 100 supports at least one movable contact 7 associated with a circuit breaker peg ”Each movable contact 7 cooperates with a fixed contact 12.

The retaining pawl 3 is supported by its end A on the end B of the arm 8 of a lever 118 which can rotate about a fixed axis 13. In the closing position of the circuit breaker shown in the figure, the end A of the pawl 3 is exactly in line with the axis of rotation of the shaft 6, so that the catch of the pawl 3 and of the arm 8 of the trigger lever 118 is independent of the position of the movable contacts 7 .

The trigger lever 118 is in the form of a ribbon, nate, nui nasse "below all of the fixed contacts 1 *" 5

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i electromagnet 109 having a mobile assembly such as an armatux 114. The electromagnets 109 are arranged on the other side of the trigger lever 118 relative to the movable contacts 7 and to the fixed contacts 12 *

It is therefore important to note that the movable armatures 114 of the electromagnets can come into contact with the trigger lever 118, without cooperating directly with the movable contacts 7. To ensure the opening of each electrical contact between a movable contact 7 and the associated fixed contact 12, the trigger leviei * 118 supports rods 115 forming hammers * t

Each rod 115 extends perpendicular to the plane of the trigger lever 118, in the direction of an associated movable contact 7 and substantially in the extension of the movable assembly 114 of the associated electromagnet 109. The coil of each electromagnet is electrically connected to the associated fixed contact 12, while 1 <movable contact 7 is electrically connected to a thermal release member 11 which also cooperates with the trigger lever 118 in a way known per se.

In the example shown, a first electrical path is defined associated with a pole of the circuit breaker (CD path) comprising the coil 10 of an electromagnet 109, a fixed contact 12, a movable contact 7, a support arm 100 and a thermal triggering member U. The other path C'D 'can be defined in an identical fashion by considering the second electromagnet 109, the second arm 100 and the second thermal trigger circuit 11, the second circuit associated with a second pole of the circuit breaker.

In the event of a short circuit in one of the two electrical paths “CD or C'D ', and as soon as the current reaches a sufficient value, 11¾ i“ “-¾ 4- *“ ma wi 1 λ 1 1 / · "/ 1 _ _i _ * ... i _ _ * / · * _ _" "·. *.

-64 tripping lever 118. The stroke of the movable armature 114 causes the tripping lever 118 to rotate around the axis 13. In this way, the opening of the circuit breaker begins with the release of the pawl 3, causing, under the action of the return spring 16, the rotation of the axis 6. This rotation of the axis 6 causes the arms 100 supporting the movable contacts 7 to pivot to move them away from the associated fixed contacts 12 · In the case of a very violent short-circuit, not causing an instantaneous opening of the electrical contacts between the movable contacts 7 and the fixed contacts 12, the coil 10 associated with the short-circuit, makes the trigger lever 118 rotate more forward around it axis 13, so that the rod 115 secured to the trigger lever 118 and in the extension of the armature 114 strikes] movable contact 7 associated to release it from the fixed contact 12 associated In this way, a sudden cut is ensured circuit breaker.

It is important to note that the movable assembly 114 of each electromagnet 119 could in fact be extended directly by a rod 115 to come directly into contact with the associated movable contact 7. However, in accordance with the invention, this movable assembly is split in two so as to accelerate the breaking on all of the poles of the circuit breaker.

As regards the operation of the thermal trip members 11, it should be noted that they each act directly on the common trip lever 118 to release the pawl and thus allow the opening of all the contacts of the circuit breaker.

Of course, the present invention is in no way limited to the embodiment described and shown which has been given only by way of example. In particular. it includes all the movens · “· 7 ·” as their combinations, if these are executed according to its spirit and implemented within the framework of the claims which follow * v ¥

Claims (1)

2. Circuit breaker according to claim 1, characterized in that the aforementioned tripping lever is in the form of a strip on one side of which the moving parts of the aforementioned electromagnets can act, and in the opposite side is extended by rods likely to come into contact with the contacts