This series of permanent magnet vacuum load switch selects high-quality vacuum load switch tube, equipped with today's advanced bistable permanent magnet operating mechanism as the main drive element, less mechanism operation element, secondary loop control power supply modular design, free of mechanical auxiliary switch conversion, can be equipped with intelligent anti-jump function, small closing and opening current, the control loop does not need a power supply for a long time in the state of closing and opening, and realizes pressure-free operation, safe and reliable, and has obvious energy-saving effect. This series of permanent magnet vacuum switches have fast closing and splitting speed, and their opening distance and over-travel are 1.5 times that of ordinary vacuum contactors, with excellent breaking performance, and the short-time withstand current can reach 20KA. It can be matched with dry transformer and disconnector to form an integrated prepaid metering box with disconnector, and can be equipped with manual closing and opening function, which has obvious cost-effective advantages, and is an ideal supporting switch for a new generation of prepaid metering box. The insulating cylinder is made of resin casting, and the power frequency withstand voltage is significantly increased to more than 60KV, and it has the effect of anti-dust and anti-condensation, which is more suitable for the integrated combined metering box.