Device for interrupting a medium-voltage electric circuit

The vacuum tube switching device with an indicator rod and compression means addresses the challenge of maintaining contact pressure and monitoring overtravel, ensuring reliable operation by minimizing moving parts and facilitating timely maintenance.

EP4553879B1Active Publication Date: 2026-07-08SCHNEIDER ELECTRIC IND SAS
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
SCHNEIDER ELECTRIC IND SAS
Filing Date
2022-05-11
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Existing medium-voltage current-switching devices face challenges in minimizing the mass of moving parts while ensuring easy monitoring of overtravel and maintaining sufficient contact pressure between electrodes, which varies due to wear and erosion over time.

Method used

A vacuum tube switching device with an indicator rod linked to the movable electrode, extending outside the insulator, allows easy determination of overtravel and contact pressure, using a compression means like a helical spring to maintain adequate contact pressure and trigger alarms for maintenance when necessary.

Benefits of technology

Facilitates easy monitoring of overtravel and contact pressure, ensuring reliable circuit operation by minimizing moving parts mass and enabling timely corrective actions.

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Abstract

A switching device (50) for a medium-voltage electrical circuit (30) is proposed, comprising: - a vacuum bulb (1) having a movable electrode (3), - an actuating lever (4) linked to the movable electrode (3) and movable between an open position (P1) and a closed position (P2), - an insulator (5) linked to the actuating lever (4), - a control sleeve (6) integral with the movable electrode (3), - an elastic return means (7), exerting a return force between the control sleeve (6) and the insulator (5), in which a displacement stroke (C1) of the actuating lever (4) is greater than the opening distance (D1) such that the control sleeve (6) is away from the insulator (5) when the actuating lever (4) is in the closed position (P2), the switching device comprising an indicator rod (8) integral with the control sleeve (6),configured to extend at least partially outside the insulator (5) when the actuating lever (4) is in the closed position (P2).
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