| 摘要 |
<p>A trip device for a contactor in the form of an electrical vacuum switch 6 having at least two contacts 7, 8 that can be displaced relative to each other for achieving a current flow comprises an axial component 13 under spring pressure 12 to actuate at least one contact; an interlock that retains the axial component 13 out of engagement in opposition to the spring 12; and a drive 21 to release the interlock. A contact ring (fig 4, 11) connected to the head of axial component 13can be axially displaceable in a housing plate 19 and have electrical connection with moving contact 8 via a spring (fig 5, 20). Tripping device 2 and vacuum switch 6 may be housed in a common housing 1. The interlock can comprise a lever 23 that engages another lever 26 supported in housing 1 and connected to a handle 32 outside the housing, by which the trip device may be reset. Interlock release drive 21 may comprise an electromagnetic, hydraulic or mechanical drive. There may be position sensor (fig 6, 35) indicating whether the switch is held open by the interlock, or tripped.</p> |
