Proximity Fuze PD440

PPD-440 – a Norwegian high-explosive fragmentation (HE) multipurpose fuze used as a proximity fuze with the ability to detonate on impact, or it can be used for impact action only with 155 and 203 mm projectiles.

Key features of the PPD-440:

1. Multipurpose use:
   • The PPD-440 can function as a proximity-activated fuze or as a classic impact fuze.
   • It is used with various munitions, mainly medium- and large-caliber projectiles (155 mm and 203 mm).
2. Proximity functioning:
   • In proximity mode, the PPD-440 uses a radar sensor that functions on reaching a certain height above the target (usually about 10 meters).
   • The fuze's electronic system analyzes the signals to precisely determine the moment when the projectile passes over the target.
3. Backup impact mode:
   • If proximity functioning does not occur for any reason, the backup impact mode is activated. This is important for reliable operation of the fuze in combat conditions.
   • In impact mode, the fuze is activated directly on contact with the target.
4. Power supply:
   • The PPD-440 does not use batteries to power its electronic systems. Instead, it is equipped with a built-in generator that obtains energy during the projectile's flight.
   • The generator works thanks to a propeller located in an air intake at the tip of the fuze. The propeller is rotated by the oncoming airflow during the projectile's flight, which generates the required electrical power.