MDNC4N, Cutler Hammer, Magnum DS, type MDNC, drawout or fixed mounted, narrow frame, 3P, 3PH, 4000A, 600V, 65kA@600V, current limiting, 40°C, draw-out, complete with interchangeable Digitrip, LI - Long-Time and Instantaneous trip functions, thermal magnetic, low voltage power insulated case circuit breakers