196 spd block products are offered for sale by suppliers on Alibaba.com, of which surge protection devices accounts for 55%.
A wide variety of spd block options are available to you, such as lightning protection, electronic equipment.You can also choose from 40, 20 and 5 spd block,as well as from 40ka, 20ka, and 10ka spd block, and whether spd block is 2p, 3p, or 1.