Method and device for protecting starters from fault currents

Details Method and device for protecting starters from fault currents Method and device for protecting starters from fault currents

1990-09-24

1991-12-10

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

335 16, 200147R, H01H 300

Patent

active

050722034

ABSTRACT:
An apparatus for protecting the fault current intolerant elements of a motor starter circuit or the like is comprised of a protective shunt which bypasses the fault current intolerant elements in response to the detection of high fault currents. The protective shunt is formed of a "U" shaped conductor which flexes in response to the magnetic field created by the flow of the high fault currents through the "U" shaped conductor. Electrical contacts place on one leg of the "U" shaped conductor and on a stationary conductor form a shunting switch which conducts high fault currents around the starter circuitry. In a second embodiment, the stationary conductor is replaced with a flexible conductor which carries an armature. The magnetic armature is attracted by a focussed magnetic field from a magnetic yoke positioned around one leg of the "U" shaped conductor.

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