These hydraulic breakers feature an energy recovery system that increases strike power. The nitrogen-powered breakers are equipped with an upper/lower suspension system that isolates the power unit from the housing. Delivering up to 600 bpm, the DXB130H is designed for use with excavators in the 15 to 22 metric-ton weight range; the DXB190H is for the 21 to 31 metric-ton range. With two speeds, the DXB190H breaker frequency can be adjusted to allow the operator to match the breaker impact rate to the working conditions. Doosan Infracore Construction Equipment America. 800-743-4340. [WOC Booth C5487]