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5813 spd ac products are offered for sale by suppliers on Alibaba.com, of which surge protection devices accounts for 57%, automatic transfer switching(ats) accounts for 1%. A wide variety of spd ac options are available to you, such as 40ka, 20ka and 10ka.You can also choose from 40, 20 and 80 spd ac,as well as from 3p, 4p, and 2p spd ac, and whether spd ac is 3.8, 1.8kv, or 1.5kv.