The FKW18-12/24/40.5 series switch is a new type of load break switch designed and manufactured by integrating mature domestic load switch production experience and advanced international technology. This load break switch is composed of disconnect blade, vacuum interrupter and operation mechanism. It adopts the principle of pressurized gas for arc extinguishing, featuring simple structure, low maintenance, strong arc extinguishing capability, high level of breaking insulation, and high reliability, reaching the level of similar international products. The switch is suitable for outdoor three- phase AC power distribution systems with a rated voltage below 12kV and a rated frequency of 50Hz, meeting the load current requirements. In the open position, it satisfies the isolation requirements specified for isolating switches.