| 摘要 |
Disclosed is a DC contactor comprising a double break with two contact points, each having a fixed and a movable contact, the movable contacts arranged on a contact bridge. The contactor includes an arc extinguishing device and a blowing device configured to blow a switch arc, which forms at the first contact point when the contact points are being opened, into the arc extinguishing device, when switching takes place in the preferential current direction. A commutating plate is arranged adjacent the movable contact of the first contact point, the contact bridge and the commutating plate being electrically insulated from one another and the commutating plate being potentially connected to the fixed contact of the second contact point, so that, when switching takes place in the preferential current direction, the switch arc forming at the first contact point jumps from the contact bridge to the commutating plate by the blowing device. |
| 主权项 |
1. A direct-current contactor (1) with preferential current direction, comprising a double break with two contact points (2, 3), which each comprise a fixed contact (4, 6) and a movable contact (5, 7), the movable contacts (5, 7) being arranged on a contact bridge (8), and further comprising an electric arc extinguishing device (9) as well as a blowing device (10, 30), said blowing device (10, 30) being configured to blow a switch arc, which forms at the first contact point (2) when the contact points (2, 3) are being opened, into the electric arc extinguishing device (9), when switching takes place in the preferential current direction, wherein a commutating plate (11) is arranged adjacent the movable contact (5) of the first contact point (2), wherein the contact bridge (8) and the commutating plate (11) are electrically insulated from one another, and wherein the commutating plate (11) is potentially connected to the fixed contact (6) of the second contact point (3), so that, when switching takes place in the preferential current direction, the switch arc forming at the first contact point (2) jumps from the contact bridge (8) to the commutating plate (11) due to the effect produced by the blowing device (10), thus bridging the switch arc formed at the second contact point (3), wherein the direct-current contactor (1) comprises an auxiliary electric arc extinguishing device (13), the blowing device (10, 30) being dimensioned and configured such that, due to the effect produced by the blowing device (10, 30), the switch arc forming at the first contact point (2) jumps, when switching takes place in a direction opposite to the preferential current direction, from the contact bridge (8) to the fixed contact (6) of the second contact point (3) and is caused to pass between the two fixed contacts (4, 6) and into the auxiliary electric arc extinguishing device (13) by means of blowing. |
