OZM

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Armed OZM 3,4,72 anti-personnel mines
Armed OZM 4 anti-personnel mine in a minefield
OZM 3/4 anti-personnel mine schematic diagram
OZM 72 anti-personnel mine schematic diagram

The OZM-3, OZM-4 and OZM-72 are Soviet manufactured bounding mine type anti-personnel mines.

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.

Operation[edit]

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.

Variants[edit]

OZM-3[edit]

  • Diameter: 7.6 cm
  • Height: 13 cm
  • weight: 3.2 kg
  • Fragmentation c TNT

OZM-4[edit]

Casing material cast iron
Weight 5.4 kg
Fragmentation charge (TNT) 170 gr
Casing diameter 90 mm
Casing height 170 mm
Length of the sensor target (one-way) 13 meters
Sensor sensitivity 1–17 kg
Radius of guaranteed lethal destruction 13 meters
Temperature usage range -60 to +60 Degrees Celsius

OZM-72[edit]

Casing material iron
Weight 5 kg
Fragmentation charge (TNT) 660 gr
Casing diameter 108 mm
Casing height 172 mm
Sensor sensitivity 1–17 kg
Radius of guaranteed lethal destruction 25 meters
Temperature usage range -60 to +70 Degrees Celsius
Number of preformed steel fragments 2400 pcs.

Ottawa Treaty[edit]

Since the Ottawa Treaty, a number of countries have decided to retain their OZM mines, but convert them to command detonation only by destroying all fuzes which can be indiscriminately activated – potentially by non-combatants or animals. Belarus in particular has decided to keep 200,000 OZM-72.

See also[edit]