MWI64N4HEA, Cutler Hammer, Magnum, type MWI, fixed mounted, double frame, 4P, 3PH, 4000A, 690V, 65kA@690V, bolt-on, NNAABBCC phasing, complete with interchangeable Digitrip RMS with possible LI/LSI/LSIG/LSIA trip functions, load side lug terminals, solid state electronic, IEC low voltage power air circuit breakers