New to the Series 6 mounted breakers, the MB956 achieves 600 to 900 bpm. A direct-acting pressurized nitrogen chamber operates at a low pressure, and thanks to its valve design, the breaker works within a broad flow range (20 to 30 gpm). Alignment of running parts offers protection of critical components. To reduce vibration, the power-cell is floated between upper and lower bumpers, minimizing vibration in the boom. Stress is absorbed in the lower body rather than the tie rod.