MDN4163HEA, Cutler Hammer, Magnum DS, type MDN, fixed mounted, narrow frame and horizontal terminal pads for bus connections, 3P, 3PH, 1600A, 600V, 42kA@600V, 40°C, bolt-on, LI - Long-Time and Instantaneous trip functions, load side lug terminals, solid state, low voltage power insulated case circuit breakers