safing and arming mechanism

safing and arming mechanism: A mechanism whose primary purpose is to prevent an unintended functioning of the main charge of the ammunition prior to completion of the arming delay and, in turn, allow the explosive train of the ammunition to function after arming.

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Fuse (explosives) — In an explosive, pyrotechnic device or military munition, a fuse (or fuze) is the part of the device that initiates function. In common usage, the word fuse is used indiscriminately. However, when being specific (and in particular in a military… … Wikipedia
Nuclear weapon design — The first nuclear weapons, though large, cumbersome and inefficient, provided the basic design building blocks of all future weapons. Here the Gadget device is prepared for the first nuclear test: Trinity. Nuclear weapon designs are physical,… … Wikipedia
Contact fuze — A contact fuze, percussion fuze or direct action (D.A.) fuze (UK) is the fuze that is placed in the nose of a bomb or shell so that it will detonate on contact with a hard surface. Many impacts are unpredictable: they may involve a soft surface,… … Wikipedia

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