HMC3800F, Westinghouse, Seltronic, MARK 75 type HMC, 3P, 3PH, 800A, 600V, 50kA@480V, bolt-on, frame only, complete with standard LS - Long-Time and Short-Time trip functions, rating plug not included, solid state electronic, molded case circuit breakers, these breakers are now obsolete; however we do still stock them