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USK series frame screw clamp terminal blocks are new products developedby UPUN with the design idea of safe, reliable, practicable and advanced, according to the requirements of market.  The USK series terminal blocksfulfill all requirements of IEC60947-7-1、GB14048.7 and JB/T9659.1 etc. Standards. This series terminal blocks can be used in the circuit of AC50Hz(60Hz), or rated voltage is 660V, or DC440V and the belows, can be used broadly in the circuit of controling and protection of power supply system, and all kinds of HV/ witch cabinet, to connect processed or unprocessed round copper conductor which rated cross section is 0.5mm2-70mm2. USK series terminal blocks passed all type-test items by National Quality Supervise and Inspection Center for Electric Control and Distribution, the certificate No. is F-76C-043.USK series terminal blocks have CE Approval.