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Ro-3 / Ro-4 / Ro-6 booby-trap fuze, Czechaslovakia

microplastic

Well-Known Member
Pic 1+2: Ro-3 pressure release firing device used with the AT-Mine PT MI-K.

After the mine is placed, the striker retaining pin is removed. When pressure is removed from the firing device, the striker spring forces the body downward and the striker upward, pushing the safety balls outward through the safety ball holes to free the striker.

Pic 3+4: Ro-4 pressure-release firing device used as booby-trap and anti-removal firing device

After the landmine is placed, the striker retaining pin is removed. When the weight on the release pin is removed by 2mm, the striker spring forces the striker forward, pushing the release pin upward.

Pic 5 - 7: Ro-6 pressure or pressure-release firing device used against rails and as a booby-trap.

When the device is placed under a railroad track, the pressure button is positioned as close to the rail as possible, this will free the safety clip, the clip can be removed.
If the pressure piece lowers or rises by 2mm, the firing pin is released
 

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