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FUZE, POINT INITIATING, BASE DETONATING: M530A1 AND M530

FUZE, POINT INITIATING, BASE DETONATING: M530A1 AND M530

Graze Fuze

Type Classification:

Std AMCTC 4265 dtd 1966.

Use:

Point initiating, base detonating type Fuzes M530A1 and M530 are designed for use in low-velocity HEAT projectiles.

Description:

The fuze is essentially an aluminum housing containing a spring-loaded brass rotor and an electrically fired detonator. In the unarmed position, the rotor is restrained by three metal leaves, so arranged as to be displaced sequentially by inertia from setback. The power source is a polarized piezoelectric ceramic disk (not shown) in the nose of the projectile connected by a wire lead to the fuze. A separate inertial plunger with firing pin is provided to act on the primer for graze impact.

Functioning:

When the weapon is fired, setback force acts sequentially on the individual leaves of the leaf arming assembly. When the third leaf has been displaced to the rear, the rotor is released and can rotate, powered by a pre-loaded spring, but retarded by an escapement mechanism. Electric contact between the housing and the rotor is made by a contact spring and a wiper contact when the rotor has move 270 to lace the detonator in the armed position. When impact is made on the target, deformation of the piezoelectric element (ceramic disk) in the projectile nose generates an electrical impulse to fire the detonator. The detonator initiates the explosive train through the lead charge and booster charge to the projectile. In event of graze impact, the inertial plunger forces the firing pin into the primer to initiate detonation.

Explosive Components:

Primer M97, Detonator M69, tetryl booster lead charge, and tetryl booster charge.

Limitiations: None.

Difference Between Models:

Model M530A1 includes an escapement mechanism not present in Model M530 to retard the rotor and extend arming time.

Tabulated Data:

Weight:

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