MWN4123HEA, Cutler Hammer, Magnum, type MWN, fixed mounted, narrow frame, 3P, 3PH, 1250A, 690V, 40kA@690V, bolt-on, ABC 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