The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering similar to 250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type lib supernovae (SNe lib). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log(10) (L) = 42.49 +/- 0.17 erg s(-1) in only -14.6 +/- 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of Ni-56 synthesized by SN 2020acat of M-Ni = 0.13 +/- 0.03 M-circle dot, with an ejecta mass of M-circle dot = 2.3 +/- 0.4 M-circle dot and a kinetic energy of E-k = 1.2 +/- 0.3 x 10(51) erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (greater than or similar to 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 angstrom that cannot be solely accounted for by the presence of the Fe II 5018 line. We suggest that the Fell feature was augmented by He I 5016 and possibly by the presence of N II 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an M(ZAMS )of 15-20 M-circle dot.