An experimental study was conducted to characterise the direct tensile behaviour of UHPFRC and its matrix under high-stress rates. Mechanical testing campaign was performed using a Split Hopkinson Tensile Bar (SHTB), consisting of a pair of aluminium bars with a diameter of 60 mm and a length of 3 m and a pretensioned high strength steel bar having diameter and length of 35.8 mm and 3 m, respectively. The UHPFRC examined in this study was a commercial product featuring a highly resistant matrix, reinforced with 3% by volume of straight high-carbon steel fibres, each measuring 13 mm in length and 0.16 mm in diameter. Tensile tests were carried out on cylindrical notched specimens with a height-to-diameter ratio (H/D) of 1 and a diameter of 60 mm, with a notch-to-radius ratio of 0.20. The results demonstrated significant increases in peak strength and energy dissipation. The material rate sensitivity was quantified using the Dynamic Increase Factor (DIF). Finally, the findings were compared with those of other UHPFRC formulations, including tests conducted on 20 mm diameter specimens and similar materials. These results contribute to a deeper understanding of the dynamic mechanical behaviour of UHPFRC, providing designers with valuable insights into the material key properties for use in protective structure design.