Magnetically latching and releasing a voice coil actuator for controlling
electrical switchgear. The voice coil actuator includes a voice coil
magnet disposed on a common longitudinal axis with respect to a voice
coil assembly. A coil of the voice coil assembly exerts a magnetic force
on the voice coil assembly, thrusting the voice coil assembly towards the
voice coil magnet. At least one pair of latching members mounted to the
voice coil assembly creates a permanent magnet circuit between the
latching members and the voice coil magnet. The permanent magnet circuit
maintains the position of the voice coil assembly relative to the voice
coil magnet, even when power to the coil is removed. This latch can be
released by applying a current in the coil or by applying an external,
physical force to a member coupled to the voice coil assembly.