Fuze MRV-U

for 122mm HE Grad Rocket

MRV-U is a mechanical, nose, point-detonating fuze with selectable super-quick or delayed action. The fuze features distant arming.

The fuze MRV-U completes 122 mm High Explosive artillery rocket M-210F, launched from BM-21 “GRAD” Multiple Launch Rocket System.

The fuze is safe in storage, handling and operation and ensures the safe and reliable function of the ammunition in all weather conditions.

The fuze has three operation modes, which are selectable, by built-in setter and wrench:
position “O” for SQ action
position “M” for short -delayed action
position “Б” for long -delayed action

Before firing the Safety and Arm device prevents the detonator from positioning into the fire train. Even in case of unintentional ignition of the primer, no transfer of the firing pulse to the fire train can occur.

The fuze is armed after burning of propellant by the set back forces.

The fuze functions under the impact and inertia forces.

The inertia device ensures ignition not only upon impact on solid ground, but also on snow or marshy ground.
Upon impact the fuze provides SQ, long-delayed or short-delayed actions.

The delayed actions are provided by two different pyrotechnic elements that ensure 0.001 to 0.005 s for short delay and 0.007 to 0.013 s for long delay.


Action: Point-Detonating, Super Quick or Delayed Action
Arming: By set-back and rotational forces
Range of Arming: After burning of rocket propellant
Time of Delay (short): 0.001 to 0.005 seconds
Time of Delay (long): 0.007 to 0.013 seconds
Operational Temperature Range for firing: -40 to +50°C
Operational Temperature Range for storing: -40 to +50°C
Shelf Life: 15 years
Length of Fuze (max): 195.36 mm
Intrusion Length (max): 54.71 mm
External Diameter (max): 64 mm
Weight of Fuze:  755 grams
Type of Booster: Tetryl
Weight of Booster: 23.2  gramms
Thread Size: Spec. 44.96 x 2tpi
PACKING: – – – 
Number of Fuzes in one Case: 16 fuzes in 4 metal air-tight sealed box in a wooden case
Case Dimensions: 500x480x180 mm.
Case Gross Weight: 19 kg.
Case Volume:  0.044 cubic meters