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937 circuit surge protector spd products are offered for sale by suppliers on Alibaba.com, of which surge protection devices accounts for 41%, lightning protection & earthing accounts for 39%, and other electrical equipment accounts for 11%. A wide variety of circuit surge protector spd options are available to you, such as industrial, lightning protection and solar system.You can also choose from 20, 40 and 10 circuit surge protector spd,as well as from 40ka, 20ka, and 10ka circuit surge protector spd, and whether circuit surge protector spd is 2p, 1, or 3p.