The 3ADT218521S0231: The H4 frame size determines the mechanical footprint and mounting pattern — if you're swapping into an existing cabinet, verify the gland plate and busbar layout accommodate this frame. The 820 A output is the continuous rated current for the 4Q regenerative drive; the 400 VAC input is the nominal three-phase supply. Sound level sits at 66–70 dB(A), which is typical for a forced-air-cooled converter of this rating — plan for enclosure ventilation and noise attenuation if the drive is near operator stations.
Environmental & Protection
Operating humidity spans 5 to 95 % RH non-condensing. The auxiliary terminals carry an IP00 degree of protection per IEC 60529 and IEC 60947-1 — meaning they are not finger-safe; terminal shrouds or a separate enclosure are needed for personnel protection.