3D dimensional dataset (256^3 cells) in HDF5 format, of a high-resolution MHD cosmological simulations obtained with the ENZO code (Bryan et al. 2015), employing 6 levels of adaptive mesh refinement. The data are mapped onto the highest resolution level available (15.8 kpc) and the region is the innermost ~Mpc^3 of a perturbed 1e15Msol cluster at z=0. The fields included are: - gas density [code units], gas temperature [K] and dark matter density [code units]; - x/y/z component of magnetic field, in code units. For the conversion into cgs: - gas/dark matter density must be multiplied by 2.6666447e-30 to get them in g/cm^3 - B-field values must be multiplied by 3.74068e-05 to get them in Gauss. For more details, see http://cosmosimfrazza.myfreesites.net/amr-clusters Vazza et al. 2017 MNRAS (https://academic.oup.com/mnras/article-abstract/doi/10.1093/mnras/stx2830/4584474)