Thispermits the LS 4 to control utility feeder breakers with one fixedsource and one variable source, or tie breakers between busses with twovariable sources.

• 这将允许ls的四管制公用事业接驳式破碎机与一个固定的来源和一个变量的来源，或配合断路器之间的总线与两个变量的来源。