OZM

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.

Casing materialcast ironWeight3.2 kg (7 lbs)Fragmentation charge (TNT)75 gr (0.16 lbs)Casing diameter76 mm (3 inches)Casing height130 mm (5.1 inches)Length of the sensor target (one way)5 meters (16.4 ft)Sensor sensitivity0.5–1 kg (1.1 2.2 lbs)Radius of guaranteed lethal destruction9 meters (29.5 ft) Temperature usage range 40 to +50*C ( 40 to +138*F)Sources

Casing materialcast ironWeight5.4 kg (12 lb)Fragmentation charge (TNT)170 gr (0.39 lb)Casing diameter90 mm (3.5 inches)Casing height170 mm (6.7 inches)Length of the sensor target (one way)10 meters (33 ft)Sensor sensitivity0.5–1 kg (1.1 2.2 lbs)Radius of guaranteed lethal destruction13 meters (42  ft)Temperature usage range 40 to +50*C ( 40 to +138*F)Sources

Casing materialironWeight5 kg (11 lbs)Fragmentation charge (TNT)660 gr (1.49 lb)Casing diameter108 mm (4.1 inches)Casing height172 mm (6.7 inches)Sensor sensitivity1.5–6 kg (3.3 13.2 lbs) with MUV 3 fuseRadius of guaranteed lethal destruction25 meters (82.5 ft) Radius of fragments50 meters (164 ft) Temperature usage range 40 to +50*C ( 40 to +138*F)Number of preformed steel fragments2400 pcs. Sources

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.