The invention is a normally-open, momentary, non-latching, inertial
thresholding switch 30, fabricated on a substrate 1 in a planar
configuration, using no cylindrical tilt mass, with low mass 16 and small
switch gap 36, 37, 38, 39 to allow fast switch action and rapid reset. Of
ultra-miniature, rugged construction, its high mechanical frequency limits
sensitivity to vibration inputs.
