What is a primary function of the FMU-81/B fuze?

The FMU-81/B fuze is primarily designed for delayed detonation. This function allows the ordnance to penetrate its target before the fuze initiates the explosion. Such a delay is critical for maximizing the effectiveness of the munition, especially against armored targets, as it ensures that the weapon has sufficient time to reach the intended penetration depth before detonating. Delayed detonation also increases the efficacy of the blast against the target, allowing for more significant damage.

While the FMU-81/B can have features related to safety and impact detonation, its primary role is focused on providing that delayed action, distinguishing it from the other types of detonation mechanisms like instantaneous impact or proximity detonation.