SN Technologies SA

Safety & Arming Device MS-470

General Description

The MS-470 is a mechanical detonator safety device for us in spinning ammunition. It has been designed primarily for assembly in electronic proximity fuses of the 40mm and 57mm L/70 systems.

The MS-470 contains an electrical 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 200'000 [m/s2] - Axial acceleration maximum 600'000 [m/s2]

Spinning Rate minimum 30'000 [rpm] - Spinning Rate maximum 61'000 [rpm]

Temperature range : - 40 < + 60 [°C]

Arming Time Parameters

System : 40 [mm] Initial rotation speed : ≥ 55'000 [rpm] Arming time : 0.08 to 0.22 [s]

System : 57 [mm] Initial rotation speed : ≥ 42'000 [rpm] Arming time : 0.11 to 0.30 [s]

Safety

The MS-470 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. Contact is made only when the electrical detonator has moved into the armed position.

Driven by centrifugal force, the MS-470 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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