| 摘要 |
The invention relates to a circuit interrupter including magnetically operable trip means for tripping the circuit interrupter open in response to overcurrents exceeding a predetermined value. …<??>The trip means in each pole of the interrupter includes a trip-bar actuating lever (105) of unitary construction, a magnetic armature (113) disposed on the lever, and a magnetizable core (119) which cooperates with the armature to form a predetermined air gap (135) when the unitary lever is in a non-actuated position, and which core is disposed to be energized by said overcurrents, thereby to attract the armature and effect a trip-bar actuating movement of the lever, the arrangement being such that the air-gap defining surfaces of the armature and core are, and throughout movement of the lever remain, substantially parallel with respect to each other. …<??>The novel arrangement permits precise calibration and adjustment over a wider range of trip currents and provides a predictably accurate response. |
