USK family products are new products designed by UPUN according to the requirements of market, with the design idea of safe, reliable, practicable and advanced. The USK series terminal blocks fulfill all the requirements of IEC60947-7-1, GB14048.7 and JB/T9659.1 etc. Standards. USK family products can be used in the circuit of AC50Hz (60Hz), rated voltage is or below 660V or DC440V to connect round copper conductor with or without treatment which rated cross section range is from 0.5mm2 to 70mm2. USK family products are used broadly in the circuit of controlling and protection in power supply system and all kinds of HV/LV switch cabinet. USK series terminal blocks passed all type-test items by National Quality Supervise and Inspection Center for Electric Control and Distribution, the certificates No.is F-76C-043. USK series terminal blocks have CE certificates. Patent certificates No is 200430083223.6