(57) A motor control, in particular of the energy storage type, for low-voltage safety
switches provided with releaser devices and with an actuation handle linked to the
movable contacts by means of a system of knee-joint levers, comprises a slider linearly
shiftable between two extreme positions, and constrained to the handle for moving
it with the getting over of the dead centre of the system of knee-joint levers from
and to an extreme position, said slider being provided with a free edge suitable to
act on one side of the handle during the stroke thereoffrom the extreme position of
switch closed towards the position of switch open, and on it means of temporary constraint
being provided, which are active when the handle and the slider are in their extreme
position of switch open, as well as during the stroke of the slider from this position
to its position of switch closed, at least till to the getting over of the dead centre
by the system of knee-joint levers, whilst said temporary constraint means are inactive
in the sense of disengaging the handle of the slider when both the handle and the
slider are in their extreme position of switch closed.
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