considered as comprising four basic parts radiating portion 4 electronics portion 6 explosive train portion 8 and the packaging configuration which provides an integrating structure for the three prior mentioned portions explosive train 8 further comprises electric detonator 10 located on or near flight axis 2 of the fuze booster charge 12 located on flight axis 2 of the fuze and lead charge 14 which may also be a detonator mounted rotatably between detonator 10 and booster charge 12 in barrel rotor 16 barrel rotor 16 is rotatable on axis 18 normal to flight axis 2 of the fuze barrel rotor 16 is supported within barrel cavity 20 by trunnion mounts 22 24 located at the axial extremities of barrel rotor 16 barrel rotor 16 may take one of four rotary positions the initial positions see fig2 a is a safe position which positions lead charge 14 75 u00b0 out of line from centerlines of detonator 10 and booster charge 12 the second safe position of barrel rotor 16 see fig2 b places lead charge 14 thirty degrees out of line with detonator 10 and booster charge 12 a third safe position of barrel rotor 16 see fig2 c places lead charge 14 ninety degrees out of line with detonator 10 and booster charge 12 the fourth position of barrel rotor 16 see fig2 d places lead charge 14 in an armed position that is in line with detonator 10 and booster charge 12 when lead charge 14 is in line it almost completely fills the space between detonator 10 and booster charge 12 as shown in the four views of fig2 drive balls 24 26 are used in cooperative slots.