UTD series terminal blocks are used in the field of industry or the similar fields, they can be installed on the mounting rails or be installed with screw directly, to connect with or without treatment round copper conductor which rated cross section is 0.75mm2-325mm2, current is 10A-600A in the circuit which rated voltage is or below AC600V, 50Hz (60Hz) or DC440V. UTD series terminal blocks are accordance with the requirements of IEC60947-1, IEC60947-7-1/EN60947-7-1 ａｎｄ GB14048.7. The patent No issued by State Intellectual Property Office of P.R.China is: 200530040340.9, 200530040341.3, 200530040342.8, 200530042960.6, 200530042961.0, 200530042972.9, 200530042971.4