| 摘要 |
<p>An electrical contactor 10 comprises a pair of first terminals 12 and fixed members 14 each having a fixed contact 36 facing the other fixed member 14. A pair of second terminals 16 having back-to-back conductive moving arms (fig 1, 20, 22) has an electrically-insulating partitioning element 24 between them and each has a movable contact 38 which faces the corresponding fixed contact 36. When the contacts 36, 38 close contra-flowing current C-D through the back-to-back movable arms produces a repulsive force E between them which urges the arms away from each other, to increase a force between the fixed and movable contacts 36, 38. The contacts may be normally closed and opened by pins 62 on an actuating carriage 48 that is moved by a dual-latching electromagnetic actuator 26. Each arm can have a distal hooked extension (fig 1, 44) biased by a wedge 64 on carriage 48 against contact tilt or bounce. There can be two or more arms of different sizes each side (fig 4, 20,22) and one, wider arm can be pre-set to lead another, narrow arm that is preset to lag, so the leading arm closes before the lagging arm. The contactor can have two sets of contacts for live and neutral feeds, be used to disconnect an electrical meter and withstand high fault currents.</p> |
