Fuze Proximity M

Type Classification:

Std AMCTC 3404 dtd 1965.


Proximity Fuze M532 is a dual purpose type used with 81mm mortar HE and WP cartridges.


The fuze consists of a ribbed plastic nose attached to an aluminum ring which is in turn attached through a slip joint to an aluminum base. A steel housing is screwed into the base. Radio transmitter/detector and amplifier/triggering circuits are contained within the plastic nose. A thermal reserve battery within the base supplies power to the electronic circuits. A setback initiated arming delay clock, detonator, and booster pellet are contained within the steel housing. The nose and attached ring are turned 1/3 turn or more in the direction indicated to change the mode of operation from proximity to point detonating (PD). It cannot be reset. A shear pin prevents accidental turning during normal handling.


Setback of a prescribed minimum force and duration activates the reserve battery and releases the arming delay clock. Approximately nine seconds after firing the clock releases the rotor containing the electric detonator and the fuze arming cycle is completed. As the fuze approaches the ground, the reflected wave interacts with the transmitted signal to cause a triggering circuit to initiate the detonator. Initiation occurs in the region of 3 to 30 feet above the ground. The height of burst depends on the angle of fall, the nature of the terrain, and the approach velocity.

Tabulated Data:

Type ----------------------------------------- Proximity

Weight----------------------------------1.30 ± 0.5 lb


Temperate Limits:



*Packing ---------------------------- 8 fuzes in metal container; 2 containers in wire-bound box

*Packing Box: Weight ------------------------------- 41.8 lb

'*NOTE: See SC for complete packing data including NSN'S.

Shipping and Storage Data

Storage compatibility group ----- B

DOT description -------------------- DETONATING FUZES CLASS A EXPLOSIVES DODAC ------------------------------- 1390-N402

UNO proper shipping name ----- Fuzes, detonating


Proximity fuzes may function under the influence of nearby bursts or fragments. An abnormal number of premature air bursts may result from volley, salvo or rapid fire from adjacent weapons. Reduce premature bursts by increasing time between round or the spacing between weapons.


TM 9-1300-251-20 SC 1340/98-IL

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