CT Shorting Block$0.00 SBA4 Choose an optionSBA4Clear *SBA4 Choose an option SBA4 Reset options CT shorting block details page. SBA6 (shorting block for 1 to 3 CTs) 30 $ Quantity: Quantity Add to cart Total: 0 Categories: Accessories, Current Transformers Description Description The SBA6 is a six position shorting block for three CTs. A shorting block is required for CT’s with a 5A output to keep high voltage off the CT output. 5 amp output CTs are compatible with the A-10, A-20, and A-30 meters. CT shorting block details page.