Objective: To evaluate whether switching bipolar radiofrequency ablation (SB-RFA) using three internally cooled wet (ICW) electrodes can induce coagulations .5 cm in porcine livers with better efficiency than consecutive monopolar (CM) or switching monopolar (SM) modes. The mean D min of coagulations was significantly larger in Group C than in Groups A and B (5.1 6 0.9, 3.9 6 1.2 and 4.4 6 1.0 cm, respectively, p 5 0.002) at a lower delivered RF energy level (76.8 6 14.3, 120.9 6 24.5 and 114.2 6 18.3 kJ, respectively, p , 0.001). Conclusion: SB-RFA using three ICW electrodes can create coagulations .5 cm in diameter with better efficiency than do SM-or CM-RFA. Advances in knowledge: SB-RFA can create large, regular ablation zones with better time-energy efficiency than do CM-or SM-RFA.