Electromagnetic actuator of the type of a relay
AssigneeBTICINO S.p.A.
InventorGianpaolo Rossetti
Life of this patent
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Abstract
An electromagnetic actuator (1) of the type of a relay, having an armature (2) polarized by a permanent magnet (5) and a movable drive element (6) attracted by the armature (2) against a spring means (8), incorporates an electric current sensor consisting of a toroidal transformer (16) penetrated by at least one conductor (17) from an electric power supply line. The actuator (1) of this invention has a major advantage in that it can combine in a single device the functions of sensing differential currents on the line and of tripping off the break mechanism of a protection breaker, within a highly compact volume.
Claims7
An electromagnetic actuator (1) of the type of a relay having a yoke (2) polarized by an annular permanent magnet (5) and an annular movable armature (6) which is attracted by the yoke (2) against a spring means (8), the actuator being controlled by an electrical current sensor comprising a transformer (16) having a toroidal core (15) wherethrough at least one electric conductor (17) is passed, the toroidal core (15) being fitted coaxially between the annular permanent magnet (5) and the annular movable armature (6), the transformer (16) being incorporated into the actuator (1) such that the toroidal core is crossed by a first magnetic flux from the permanent magnet, a second magnetic flux induced in the toroidal core by current flowing in the conductor (17) interfering orthogonally with the first magnetic flux from the permanent magnet (5).
An actuator according to claim 7, wherein the case (10) is cylindrical and comprises opposed bases (11,12) formed centrally with corresponding holes (13,14) coaxial with the toroidal core (15).
Dependencies are inferred from the claim text.