OZM-4 Russian Anti-Personnel Mine

The OZM-3, OZM-4 and OZM-72 are Soviet manufactured bounding type anti-personnel mines. (fragmentation-barrier mine , in the Russian and other post-Soviet armies as informally called "frog mine" or "witch" ) They are normally painted olive green, and issued with a spool of tripwires and two green painted wooden or metal stakes for affixing the tripwires. Both OZM-3 and OZM-4 have cast iron fragmenting bodies while the OZM-72 also contains preformed steel fragments, and all three are issued with empty fuze wells, so a variety of fuzing options are possible. The mines can be activated by a variety of fuzes, including electronic fuzes or command initiation, although they are most commonly fitted with an MUV booby trap switch which is activated by a tripwire. On firing, a metal base plate remains in the ground, while the mine body is thrown up by a small lifting charge, but remains attached to a strong wire tether. When the end of the tether is reached at a height of approximately 0.5 m, the main charge explodes and scatters fragments of the casing across a wide area. OZM mine may sometimes be laid directly on top of an MS-3 mine. The MS-3 is an anti-handling device which closely resembles a PMN mine, except that it has a "blister" on top and operates purely as a pressure-release boobytrap. Lifting an OZM mine (without rendering safe the MS-3 placed underneath) will trigger detonation.