Electrical contact system for a switching device

Abstract

An electrical contact system (2) for a switching device (1). The system includes at least one pair of contacts (3) having a fixed contact piece (4) and a contact piece (5). The contact piece (5) is coupled to a slide (15). A planar contact piece carrier (7) extends in the longitudinal section thereof and is attached at the first end (11) to a second busbar (13). A second end (12) of the contact piece carrier (7) is coupled to the slide (5). A spring element (18) having a first spring arm section (22), a second spring arm section (23) and a pressure region (24) arranged therebetween in the area of the movable contact piece (5). The first spring arm section (22) is attached to the second busbar (13) at the first end (11). The second spring arm section (23) is also coupled at the free end (21) thereof to the slide (15).

Description

technical field [0001] The invention relates to an electrical contact system for a switchgear, wherein the switchgear used in the invention may include relays, switches, contactors and circuit breakers. Background technique [0002] Switching devices such as relays, switches, contactors and circuit breakers should have the following characteristics: high efficiency due to low resistance between connection terminals, low losses, and safety during operation of the equipment, especially during heating and A fire protection aspect as well as a long service life, which means as many switching operations as possible under load; and a protection against the contacts sticking to each other due to high short-circuit currents, for example in the event of an electrical fault. [0003] In conventional switching devices, a spring element ensures that the movable contact is lifted quickly away from the fixed contact when the contact is released, thereby reducing wear on the contact. [0...

AI Technical Summary

Problems solved by technology

However, this will result in a greater mechanical load than the direct connection of the spring element to the movable contact as described above

Besides that, it has the disadvantage that the springs get hot, which can lead to deformation of the slider, which shortens the life of the contact system

Furthermore, since the contact carrier is deformed during a short circuit due to the following conditions, the rolling-off movement of the contacts is restricted

Where the spring element is connected to the movable contact, for example by riveting, the high stiffness leads to a reduced flexibility of the spring element and thus limits the rolling-off movement of the contact

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