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"PIBD" to be correct. To my understanding the base element just has a detonator safety which slides the det forward into armed position. The initial impulse should come from the nose section which has an arming delay (as we know it from mortar fuzes - non spin types)
Thanks guys for these valued comments and the added info, but I still missing how the order will be transferred from the nose to the base detonator, it looks mechanical as I can't see any peizo or crush switch or any of the usual stuff, I will be grateful and much appreciate a clear explanation.
Recently and when I tired to review the fuze mechanism, I realized that I can't understand how the nose primer (also the base sliding one) will be allowed to move forward upon the projectile launch, any kind of setback or something like that... I will much appreciate your help.
Unfortunately I never examined one myself but they are setback armed and some sliding elements (in top and base elements) do set back on firing.
The upper seems to rest in the lower armed position after it set back (passing the zig zag arming delay) and the lower seems to free some locking balls (by a set back sleeve) which release the det assembly which moves forward after acceleration is evened out by the force of the spring doing this (2nd arming delay).
All this is not to 100% since I have to assume some actions - as said above, never examined one.
Maybe Mr. Fuze can tell us details as I assume him to have one of these.