MDD-X40, Cutler Hammer, Magnum DS, type MDDX, drawout or fixed mounted, double frame, 3P, 3PH, 4000A, 635V, 200kA@508V, non-current limiting, bolt-on, complete with interchangeable Digitrip RMS, 2000-4000A current sensor available, solid state, low voltage power insulated case circuit breakers