Abstract: A magnetic particle suspension system includes a vessel defining a chamber and an opening to the chamber, particles magnetically responsive to a magnetic field disposed in the chamber, and a suspension apparatus for controllably moving the magnetic field along a path having an engagement portion in which the magnetic field effects a magnetic response in the particles, wherein the suspension apparatus includes a motor, an arm movably driven by the motor, and a magnet supported by the arm for movement along the path, wherein the motor rotatably drives the arm about a drive axis so that the magnet travels along a circumaxial path about the drive axis.

Abstract: In one general aspect, an apparatus can include an input terminal, an output terminal and a ground terminal. The apparatus can also include an overcurrent protection device coupled between the input terminal and the output terminal. The apparatus can further include a thermal shunt device coupled between the output terminal and the ground terminal, the thermal shunt device being configured to, at a threshold temperature, operate in a thermally-induced low-impedance state.