A mechanical device which detects t' presence o' acceleration through t' movement o' a weighted electrical contact. g-switches are normally used in combination with other electronic devices such as timers. For example, an electronic timer can be programmed t' count down a certain number o' seconds after t' Gswitch closes an electrical circuit, ya bilge rat, at t' end o' which time t' timer closes a second circuit which activates a deployment charge or sustainer motor igniter.