2010 Conference on Precision Electromagnetic Measurements (CPEM 2010). Daejeon, South Korea, 13 - 18 June 2010, 125 - 126 ; We develop a quantum current standard based on the hybrid superconductor-insulator-normal-metal-insulator-supercond uctor (SINIS) structure in turnstile operation. We discuss the properties of the device and the relevant error sources. We also present a preliminary plan how to implement the device in a direct quantum metrological triangle experiment. (12 refs.)