MDSC303HEA, Cutler Hammer, Magnum DS, type MDSC, fixed mounted, standard frame with horizontal terminal pads for bus connections, 3P, 3PH, ABC phasing, 3000A, 600V, 100kA@600V, 40°C, bolt-on, LI - Long-Time and Instantaneous trip functions, load side lug terminals, thermal magnetic, low voltage power insulated case circuit breakers