The document provides information on Sécheron's UR series of high-speed DC circuit-breakers for fixed installations. It summarizes the key features and specifications of the UR26, UR36, UR40, UR46, UR60, and UR80 circuit breaker models. The UR series has proven reliability and is designed according to relevant IEEE and ANSI standards for applications in light rail and heavy rail transit systems in North America. It offers rated continuous currents from 2,150A to 8,000A and maximum voltages of 800VDC or 1,600VDC, depending on the model.