UL, CUL, CSA. UKH universal high-voltage terminals. These high-current feed-through terminal blocks from Phoenix Contact ensure a reliable cable connection due to the three-point centring of the conductor in the prismatic sleeve base. The screw locking is achieved by spring-loaded elements within the clamping part. Features and Benefits. Reliable cable connection. Low contact resistance of the contact surface. Spring-loaded elements in the clamping part. Direct screw connection