MDN4083LEA03MMNMNNNENNNAX, Cutler Hammer, Magnum DS, type MDN, drawout mounted, narrow frame, 3P, 3PH, 800A, 300A current sensors and rating plugs, 600V, 42kA@600V, bolt-on, manually operated, complete with interchangeable Digitrip 520M, LSIG - Long-Time, Short-Time, Instantaneous and Ground Fault trip functions, 120Vac trip unit power supply voltage, ground trip, load side lug terminals, solid state electronic, low voltage power insulated case circuit breakers