Electro Industries 6-Pole DIN Rail CT Shorting Block. These shorting blocks are designed to be a superior alternative to the traditional shorting block. They uniquely have captive hardware to prevent lost grounding screws. This design protects against errors, insuring inherently safer installation or removal of meters from service. The CT shorting blocks indicate clearly when the screw is engaged and the circuit shunted. They are mounted using a traditional DIN mount for faster installation.