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The product of VRA001 belong to the advanced level of the nineties in the world instead of the older generation. They have protective function as shortage as overload, and are used in induatry, commerce and dwelling, and protect frational electric motors. And they also have many merits of high protective grade (up to lp20) , high breaking capacity, reliable sensitive action, convenient, multi pole assembling, long time etc. They are mainly adapted to the circuit of AC 50Hz, 230V in single pole, 400V in double, three, four poles for protecting overload and short circuit. Meanwhiles, they are also in turning on or off the electric apparatus and lighting circuit under the normal condition.