General Info

  • Full name PRB M-409/ NR 409
  • Less than 1g of metal
  • Pressure operated, hand-laid
  • Main variant- M 411 from Portugal


  • Type: Antipersonnel, Minimum metal, Blast mine
  • Manufacturer: Belgium
  • Diameter: 82mm
  • Height: 28mm
  • Weight: 183g
  • Explosive: 80g TNT & Comp B (Trialene)
  • Range: 15m
  • Composition: Plastic casing and cap, only firing pin, igniter caps, detonator are metal
  • Operating pressure: 8 to 30 kg

Internal Workings
The fuze incorporates two opposing spring-steel firing pins. The strikers are held apart by a sliding bolt attached to the pressure plate. The bolt has an aperture holding two igniters. When the bolt is displaced, the strikers are released onto the igniters and the flash is channeled to the detonator.
The mine is green and sand brown in color.

Diagram of M409 mine
Section Diagram

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