3-Phases Cts Set UL certified for direct mounting below common circuit breakers.Three-phase current transformer set for primary current range up 3 x 50 A to 3 x 750 A, secondary current range 5 A, 2 A or 1 A at the accuracy classes 0,2, 0,5s, 0,5 and 1. 2 fastening are required to snap onto the DIN rail and they are UL certified.