SN Technologies SA

Safety & Arming Device MS-477

General Description

The MS-477 is a mechanical detonator safety device for us in spinning ammunition. It has been designed primarily for assembly in mechanical or electronic fuses of the 76mm navy shell.

The MS-477 contains a flame detonator.

Dimensions

Diameter maximum : 23.05 [mm]

Height maximum : 18.65/20.83 [mm]

Weight : Without explosive components : 12 [g]

Functional Parameters

Axial acceleration minimum 150'000 [m/s2] - Axial acceleration maximum 400'000 [m/s2]

Spinning Rate minimum 19'000 [rpm] - Spinning Rate maximum 35'000 [rpm]

Temperature range : - 40 < + 60 [°C]

Arming Time Parameters

Initial rotation speed : ≥ 24'500 [rpm] Arming time : 0.15 to 0.30 [s]

Safety

The MS-477 integrates a centrifugal as well as a set-back safety device which works independently of each other. Prior to firing, i.e. in safety position, the explosive train is interrupted.

Driven by centrifugal force, the MS-477 ensures a constant safety distance in front of the muzzle for a given type of gun, independent of the initial speed of the projectile.

Matching of other Requirements

This S&A device has been designed in such a way as to be easily adaptable to the requirements of guns with other characteristics.

Reference Standards : MIL-STD-331, MIL-STD-105

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