Patent ID: 9053882
Filing Date: 2015-06-09
Classification: H01H

Abstract:
1. A magnetic actuator unit for a circuit-breaker arrangement, comprising: an unperforated disk-shaped ferromagnetic armature arranged to be movable along an axis between a first end position and second end position for an opened and closed switching position respectively of a circuit-breaker; a single electrical coil for moving the armature to the second end position in response to an electrical current feed wherein the coil and the armature are arranged to not overlap in any plane perpendicular to the axis; a permanent magnet for additionally loading the armature in a direction of a second position; an outer ferromagnetic yoke at least partly surrounding the single electrical coil and a ferromagnetic core for directing magnetic flux to the armature; and an opening spring for loading the armature in the direction of the first position, which is coaxially arranged between said armature and a front side of the electrical coil, wherein in an open switching position, the opening spring is partly accommodated inside a groove formed in the armature and partly accommodated outside the groove, the outer dimension of the armature corresponding to an outer dimension of the ferromagnetic yoke.