Safety device with thermal and electromagnetic release for a multi-contact circuit-breaker
AssigneeUnelec
InventorJean Hennemann
Life of this patent
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Abstract
This device comprises means for detecting, respectively, overcharges, by means of bimetallic strips and short-circuiting, by means of mobile magnetic plates effecting independently from each other the controlling of the switching off of a circuit-breaker for the protection of a circuit. The thermal safety means operate through a mechanical power amplifier comprising a cage with uprights, a rotating catch dependent on the thermal phase-detectors and a plunger transmitting the power of a spring to effect the switching off.
Claims8
Safety device having a thermal and an electromagnetic release for a multi-pole circuit-breaker comprising means for the detection respectively of overcharge and of short-circuiting actuating, independently from each other, the element for controlling the locking of the said circuit-breaker, characterized in that the said control element (15) is driven respectively directly by an electromagnetic release shaft (8) common to all the poles and which is actuated by the said electromagnetic means (35) for detecting short-circuiting and indirectly through a mechanical power amplifier (12) interposed and controlled by an auxiliary shaft (10) common to all the poles and which are actuated by the said means (40) for the thermal detection of overcharge and in that the said mechanical amplifier (12) comprises a cage (21) having uprights (70);
- a rotating catch (22) assembled so as to rotate on a shaft transversal to the said cage (21) and which is actuated by the said auxiliary shaft (10), a plunger (20) controlled by the said catch (22) assembled to rotate about a shaft (14) and transmiting the mechanical power of a spring (27) to the said control element (15).
Dependencies are inferred from the claim text.