Global Patent Index - EP 0013642 A1

EP 0013642 A1 19800723 - Low voltage current limiting circuit breaker.

Title (en)

Low voltage current limiting circuit breaker.

Title (de)

Strombegrenzender Selbstschalter für Niederspannung.

Title (fr)

Disjoncteur limiteur basse tension.

Publication

EP 0013642 A1 19800723 (FR)

Application

EP 80400014 A 19800107

Priority

FR 7900827 A 19790111

Abstract (en)

1. Low voltage current limiting circuit breaker comprising by pole a fixed contact (50, 52) cooperating in the switch-on position of the circuit breaker with a movable contact (48) coupled to a mechanism (17) of manual and/or automatic switching operation of switching off and on the circuit breaker, and an electromagnetic release (20) cooperating with said mechanism (17) to trip the circuit breaker and to switch off the contacts (48, 50, 52) when the fault current detected by electromagnetic release (20) exceeds a first threshold, said release comprising a magnetising coil (30) with an axial magnetic core (28) flowed through by said fault current and a magnetic circuit (22) having a movable plate (32) separated by a first air-gap (e1 , e2 ) from two fixed yokes shaped as parallel cheeks (24, 26) surrounding the coil (30) with a core perpendicular to the cheeks and cooperating with the movable plate (32) to displace this last one in the tripping position when said first threshold is exceeded, said cheeks (24, 26) defining a second air-gap (e3 ) inside which a part (56) of the movable contact (48) extends in the switch-on position of the contacts (48, 50, 52), characterized in that the ends of the cheeks (24, 26) are folded up ar right angles, thus defining the second air-gap (e3 ) of narrow width, through which extends in the switch-on position of the contacts (48, 50, 52) a conducting spline (56) being part of the contact (48), movable along a direction perpendicular to the spline (56) length and parallel to the cheeks (24), (26), so that the magnetic flux, generated in said air-gap (e3 ) by the fault current flowing through the coil (30), induces an electrodynamic effect of fast displacement of the movable contact (48) in the switch-off position when this current exceeds a second threshold above said first threshold.

Abstract (fr)

Le circuit magnétique (22) du déclencheur électromagnétique comporte deux culasses (24, 26), coopérant d'une part avec une palette de déclenchement (32) et d'autre part avec le contact mobile (48). Une bobine d'excitation (30) enroulée sur un noyau (28) engendre lors de l'apparition d'un courant de court-circuit un flux magnétique, provoquant à des seuils différents l'entraînement électrodynamique du contact mobile vers la position d'ouverture, et l'attraction de la palette (32) pour le déverrouillage du mécanisme de manoeuvre (17).

IPC 1-7

H01H 77/10; H01H 71/24

IPC 8 full level

H01H 71/24 (2006.01); H01H 77/10 (2006.01)

CPC (source: EP)

H01H 71/2418 (2013.01); H01H 71/2472 (2013.01); H01H 77/108 (2013.01); H01H 71/2454 (2013.01)

Citation (search report)

Designated contracting state (EPC)

BE CH DE GB IT NL SE

DOCDB simple family (publication)

FR 2446538 A1 19800808; FR 2446538 B1 19830218; DE 3060923 D1 19821118; EP 0013642 A1 19800723; EP 0013642 B1 19821013

DOCDB simple family (application)

FR 7900827 A 19790111; DE 3060923 T 19800107; EP 80400014 A 19800107