| 摘要 |
<p>A device for arc-free switching of electric circuits has a contact switching unit (1) to the movable contact (7) of which is connected the emitter of a transistor (6) contained in a circuit (5) for protecting the contacts of the contact switching unit. To the collector of the transistor (6) are connected the anodes of diodes (8, 9) contained in the protection circuit (5) and connected, through their cathodes, to the stationary contacts (2, 10) of the contact switching unit (1), thus forming electric circuits shunting the movable contact (7) with each of the stationary ones of the moment of switching. To the base of the transistor (6) is connected a resistor (12) contained, together with diodes (13, 14) and stationary contacts (2, 10), in a unit (11) for controlling the transistor. The cathodes of the diodes (13, 14) are connected to the base of the transistor (6), whereas the anodes are connected to the stationary contacts (10, 2), thus providing for the control of the transistor (6) through the extreme and the intermediate positions of the movable contact (7) and ensuring the switching of two loads (4, 16).</p> |
