ABB ACS501-020-4-00P2 is a 20 HP, 440–500 VAC three‑phase general‑purpose variable frequency drive with a bypass option. It accepts 440–500 VAC three‑phase input and can deliver a 0–500 Hz output to standard three‑phase motors, with a nominal current around 27 A at 460 V. The unit is commonly configured for wall‑mount installation and is documented to offer an internal control panel with enclosure variants suitable for IP21/NEMA 1 environments. This ABB drive sits within the ACS501/ACH501 family, with multiple listings confirming the 20 HP/27 A/440–500 VAC specifications.
