Electromechanical protection switch

Abstract

The invention relates to an electromechanical protection switch (100) with: - at least one main contact pair (1, 1'), wherein one main contact (1) is arranged on a main contact bridge (2) , - at least one pair of secondary contacts (4, 4') with a higher melting point material than the primary contact (1), wherein one secondary contact (4) is arranged in a On the secondary contact bridges (5) connected in parallel with the contact bridges (2), - the first armature (10) for the movement of the main contact bridge (2), - the second armature (for the movement of the secondary contact bridge (5) 15), wherein the armature (10, 15) is formed such that the pair of secondary contacts (4, 4') opens after the pair of primary contacts (1, 1') and before the pair of primary contacts (1, 1') closure.

Description

technical field [0001] The invention relates to electromechanical protective switches for separating high currents. Background technique [0002] Protective switches, also known as relays or protectors, are known in the prior art. The basic function of such protective switches is to switch high electrical powers in load circuits by means of relatively small currents, ie control currents. The current in the load circuit is here many times greater than the control current. [0003] A problem that arises in protective switches when switching on high power is that arcing can occur when the switching contacts are closed, which leads to wear of the switching contacts. In the protective switches known from the prior art, the switching contacts are made of copper or silver, for example. In particular, at high voltages and currents an unavoidable current flow occurs between the switching contacts to be separated. Usually, this arc is quenched by additionally using, for example, q...

AI Technical Summary

Problems solved by technology

If such high load currents flow through the protective switch when the contacts are separated, the number of switching cycles of the protective switches currently used is limited due to their construction

The switching contacts of this protective switch, whose contacts usually consist of copper or silver, can only be separated a few times with a separating current of this magnitude, because the separating current usually causes serious damage on the switching contacts of the protective switch

The protective switch has to be replaced again after only a few switching cycles, which increases the maintenance costs of such protective switches

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