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QTQ2 series dual power automatic transfer switch is one of adopted international ATSE technology developed by our company.It is suitable for power supply system with rated insulating voltage is AC800V,rated working voltage is AC690V,and below DC250V,and AC 50Hz/60Hz,rated working current is 20A-5000A of two-path.The transfer switch and the matching intellect display,they are main used for high building,the post and communication,coal mining,shipping,military facilities industrial assembly line etc the situation of need the interruption power supply.Under the city rapid increase power supply necessary trend,they can satisfy the higher requires of reliable power supply,the products have reliable performance,small size and easy operation etc features. ATTENTION:it must not do the test of insulating stand voltage for the quality guarantee.