| 摘要 |
<p>A magnetic actuator unit (100) for a circuit breaker, in particular for a medium voltage vacuum circuit breaker, is provided comprising a core (101), a coil (105), an actuating shaft (104), a first movable plate (103) and a second movable plate (107). The magnetic actuator unit (100) is adapted for switching the circuit breaker ON and OFF by moving the first movable plate (103) between an ON position and an OFF position. The magnetic actuator unit (100) further comprises a non-magnetic flat insert (110) arranged between the core (101) and the second movable plate (107), wherein the non-magnetic flat insert (110) and the second movable plate (107) are adapted for adjusting a holding force of the magnetic actuator unit (100) provided by the second movable plate (107) at the OFF position, wherein the holding force is sufficient for holding the second movable plate (107) at the OFF position against the outer forces that are acting on the magnetic actuator unit (100).</p> |
