Ultrasound
It consists of the following parts: - puncture-safe mechanism; - target sensor; - remote device; - remote cocking mechanism; - detonating unit. The puncture-safe mechanism, which ensures the safety of the fuse in service use and the puncture of the igniter capsule after throwing the grenade, consists of a stinger, a striker, a safety check with a ring, a spring, a lever, a plug, a bar and a KV-N-1 igniter capsule. The remote cocking mechanism ensures safety in service use and cocking the fuse 1-1.8 seconds after the throw. It consists of two bushings with retarders, stoppers, an engine, a KV-N-1 igniter capsule and a spring. The target sensor, which ensures the operation of the fuse when the grenade hits an obstacle, consists of an inertial load, a sleeve, a bushing, a stinger and a spring. The remote device ensures the detonation of the detonator 3.2 - 4.2 seconds after the grenade is thrown. It consists of a bushing with a retarder and a B-37 detonator capsule. The detonating unit consists of a 7K1 detonator capsule and a bushing fixed in a glass.
During service use of the fuse, the striker is held from moving by a lever fixed to the body by a safety catch, the ends of which are spread apart. The motor of the remote cocking mechanism is offset relative to the sting and is held from moving by stops. The inertial load is pressed against the body by a sleeve with a target sensor spring, the movement of which is limited by the motor. Before throwing the grenade, the safety catch is straightened (the ends are brought together) and pulled out, while the lever is held by the hand in the initial position (pressed to the grenade body). After throwing the grenade, the lever is thrown back under the action of the spring and releases the striker with the sting, which under the action of the spring rotates around its axis and pierces the primer-igniter of the puncture-safety mechanism. A beam of fire from the primer-igniter ignites the retarders of the remote cocking mechanism and the remote device. After the retarders burn out, after 1 - 1.8 seconds, the stops of the remote cocking mechanism are moved by the springs and release the engine of the remote cocking mechanism, which moves under the action of the spring, as a result of which the primer-igniter is placed opposite the target sensor sting. The spherical shape of the inertial load and the conical shape of the fuse body and the target sensor sleeve allow the inertia component to be perceived in a wide range of angles. From the overload that occurs when meeting with an obstacle (Figure 11c), the inertial load moves in the direction of impact and causes the sleeve to move in the target sensor sleeve, as a result of which the sting pierces the primer-igniter. The beam of fire from the primer-igniter ensures the operation of the primer-detonator of the fuse, which causes the detonation of the grenade's bursting charge. In the event of a target sensor failure upon encountering an obstacle (falling into mud, snow, falling on its side), the detonator capsule is detonated by a flame pulse from the detonator capsule of the remote mechanism, which is triggered after the moderator burns out after 3.2 - 4.2 seconds.