Switching device having a thermal and electromagnetic release

Details Switching device having a thermal and electromagnetic release Switching device having a thermal and electromagnetic release

H - Electricity

01

H

H01H 71/40 (2006.01) H01H 71/12 (2006.01)

Patent

CA 2582319

The invention relates to switching equipment (1, 1a, 1b, 1c, 1d) comprising a housing (2, 2a, 2b, 2c, 2d), at least one contact point (4, 4a, 4b, 4c, 4d) that has a fixed contact part (8, 8a, 8b, 8c, 8d) and a mobile contact part (6, 6a, 6b, 6c, 6d) and a thermal and magnetic trip device (20, 20a, 20b, 20c, 20d), comprising a trip coil (22, 22a, 22b, 22c, 22d) and a trip armature (24, 24a, 24b, 24c, 24d). Said equipment is characterised in that the trip armature (24, 24a, 24b, 24c, 24d) comprises at least two trip sub-armatures that interact, the first sub-armature (124, 124a, 124b, 124c, 124d) being configured from a first material with magnetic shape memory properties and the second trip sub-armature (224, 224a, 224b, 224c, 224d) being configured from a thermal bimetal, a material with thermal shape memory properties, or a material with combined thermal and magnetic shape memory properties. According to the invention, when a short circuit occurs, the trip armature (24, 24a, 24b, 24c, 24d) is deformed both by the influence of the magnetic field of the trip coil (22, 22a, 22b, 22c, 22d) and by the influence of a temperature increase that is caused by an excess current, thus causing the contact point (4, 4a, 4b, 4c, 4d) to open.

La présente invention concerne un appareil de commutation (1, 1a, 1b, 1c, 1d) comprenant un boîtier (2, 2a, 2b, 2c, 2d) et au moins un point de contact (4, 4a, 4b, 4c, 4d) qui présente un plot de contact fixe (8, 8a, 8b, 8c, 8d) et un plot de contact mobile (6, 6a, 6b, 6c, 6d), ainsi qu'un déclencheur thermique et magnétique (20, 20a, 20b, 20c, 20d) qui comprend une bobine d'excitation (22, 22a, 22b, 22c, 22d) et un induit d'excitation (24, 24a, 24b, 24c, 24d). Cette invention est caractérisée en ce que l'induit d'excitation (24, 24a, 24b, 24c, 24d) comprend au moins deux induits d'excitation partiels qui sont en liaison active. Le premier des induits d'excitation partiels (124, 124a, 124b, 124c, 124d) est constitué d'un premier matériau magnétique à mémoire de forme et le second des induits d'excitation partiels (224, 224a, 224b, 224c, 224d) est constitué d'un bilame thermique, d'un matériau thermique à mémoire de forme ou d'un matériau combiné thermique et magnétique à mémoire de forme. L'induit d'excitation (24, 24a, 24b, 24c, 24d) se déforme aussi bien sous l'influence du champ magnétique de la bobine d'excitation (22, 22a, 22b, 22c, 22d) en cas de chute de courant de court-circuit que sous l'influence d'une élévation de température induite par une surcharge de courant, provoquant alors l'ouverture des points de contact (4, 4a, 4b, 4c, 4d).

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