A trip mechanism for a low and medium voltage switching device

• Main Authors: CARNAZZI, ANDREA, MORICONI, GIORGIO
• Format: Patent
• Language: English; French; German
• Published: 25.11.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

A trip mechanism (1) for a LV or MV switching device (100) characterised in that it is operatively coupleable with a first operating element (401) of said switching device, which is reversibly movable between a first actuation position (A0) and a second actuation position (B0), and with second operating element (402) of said switching device, which is reversibly movable between a third actuation position (A5) and a fourth actuation position (B5). The trip mechanism comprises: - a supporting frame (2); - a first trip lever (3), which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a first engage position (A1) and a first trip position (B1), said first trip lever being operatively coupleable to said first operating element (401), so that said first operating element moves said first trip lever from said first engage position (A1) to said first trip position (B1), when said first operating element moves from said first actuation position (A0) to said second actuation position (B0); - a second trip lever (6), which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a second engage position (A2) and a second trip position (B2), said second trip lever being operatively engageable with said first trip lever, so that said second trip lever is blocked by said first trip lever in said second engage position (A2) when said first trip lever is in said first engage position (A1), said second trip lever moving from said second engage position (A2) to said second trip position (B2) when said first trip lever moves from said first engage position (A1) to said first trip position (B1); - a third trip lever (8), which is operatively connected to said supporting frame is capable to rotate with respect to said supporting frame between a third engage position (A3) and a third trip position (B3), said third trip lever being operatively engageable with said second trip lever, so that said third trip lever is blocked by said second trip lever in said third engage position (A3) when said second trip lever is in said second engage position (A2), said third trip lever moving from said third engage position (A3) to said third trip position (B3) when said second trip lever moves from said second engage position (A2) to said second trip position (B2); - a trip pin (9), which is operatively connected to said supporting frame and is capable to translate with respect to said supporting frame between a fourth engage position (A4) and a fourth trip position (B4) and is operatively engageable with said third trip lever, so that said trip pin is blocked by said third trip lever in said fourth engage position (A4) when said third trip lever is in said third engage position (A3), said trip pin moving from said fourth engage position (A4) to said fourth trip position (B4) when said third trip lever moves from said third engage position (A3) to said third trip position (B3), said trip pin being operatively coupleable with said second operating element (402), so that said trip pin moves said second operating element from said third actuation position (A5) to said fourth actuation position (B5), when said trip pin moves from said fourth engage position (A4) to said fourth trip position (B4).