various ultra - miniature , monolithic inertial switching devices used in safety and arming devices for projected munitions , which operate in accordance with a shuttle member , which effectuates current switching of around an ampere of current when subjected to a threshold inertial loading . the embodiments of the invention can be a passive threshold g - switch with or without switch enable and arming capability . the embodiments of the invention use either mechanical or electromechanical switch enable functioning and can optionally include a shuttle time - delay feature . both embodiments can incorporate various designs for a switching assembly such as latching single - throw switch having the configurations of either a normally - open , double pole , single - throw switch or a normally - open , single pole , single - throw switch , wherein switch closing occurs when the shuttle member experiences inertial loading and penetrates the switching assembly .