S-4型装备在“初岛”级前23艘艇上。由 ZQS-2B 水雷探测器、航行体、控制盘组成,可探测数十米深度内的沉底雷。航行体为圆盘形,在潜航状态下接近目标,投下引爆雷破坏水雷。航行体由电力推进,电力及控制信号由母艇通过电缆传输。由于圆盘形状在水中易受类似于波浪等外力的影响,所以在使用过程中有一定的难度。该型扫雷具重920千克,全长2.3米,宽1.8米。 S-4-type equipment in the “Island” class 23 ships. By ZQS-2B mine detector, navigation body, control panel, can detect the depth of dozens of meters deep thunder. The sailing body is disk-shaped, approaching its target in a submerged state and dropping a detonating mine to destroy the mine. The navigation body is propelled by electric power, and the power and control signals are transmitted by the mother boat through the cable. As the disk shape in the water vulnerable to waves and other external forces, so in the course of a certain degree of difficulty. This type of mine clearance with 920 kilograms, length 2.3 meters, width 1.8 meters.