This paper presents a novel brace-type damper composed of double C-section channels with slits arranged on the web panels. Quasi-static tests were conducted to assess its performance with varied loading protocols. Four distinct loading protocols were employed, including a standard incremental loading protocol, two constant amplitude loading protocols with different displacement amplitudes, and a special loading protocol designed to simulate the near-fault seismic velocity pulse effect, followed by a standard incremental loading. Hysteretic curves and test phenomenon were presented with key performance indicators such as the ultimate load, initial cracking cycle, total cycles, and energy dissipation. The test results demonstrated that the proposed damper exhibited favourable performance in terms of strength, deformability, energy dissipation capacity, and low-cycle fatigue resistance. The specimen subjected to prior near-fault loading endured more cycles compared to the specimen without a preceding such loading, highlighting the damper’s ability to withstand near-fault earthquakes. Finite element models were developed and validated against experimental data to further interpret the behaviour of the damper. This study provides experimental evidence to support the performance evaluation and design of the novel damper.