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The ABB ACS550-01-05A4-4 is a wall-mounted standard drive in the ACS550 family, rated 2.2 kW / 3 HP at 380-480 V three-phase input. It is one of the most installed VFDs across HVAC, water, and general industrial applications in North America, and even though ABB has positioned the ACS580 as the successor, the ACS550 stays in service across thousands of plants because of its proven reliability and well-understood macros. This page consolidates the verified specifications, points out which ACS580 frame replaces it, and lists the typical accessories ordered alongside the drive.
ACS550-01-05A4-4 Technical Specifications
- Series: ACS550 standard drive, wall-mounted (-01)
- Rated output: 2.2 kW / 3 HP (normal duty)
- Output current: 5.4 A continuous (normal duty), with overload capability typical of the ACS550 series
- Input voltage: 380-480 VAC, three-phase, 48-63 Hz
- Output voltage: 0 to input voltage, three-phase
- Frame size: R1
- Enclosure: IP21 standard (UL Type 1), IP54 / UL Type 12 versions available as separate part numbers
- Control: scalar (V/Hz) and sensorless vector control
- EMC filter: built-in EMC filter for second environment (verify against the catalog code)
- Built-in I/O: digital and analog inputs, relay outputs, and a fieldbus slot
- Communication: Modbus RTU built-in via RS-485, optional fieldbus adapters for Profibus DP, DeviceNet, EtherNet/IP, and Profinet
- Control panel: ACS-CP-C basic panel or ACS-CP-A assistant control panel
- Approvals: UL listed, CE, C-Tick, RoHS
For the precise overload curve, ambient derating, and switching frequency settings, cross-check the ABB ACS550 user manual that matches the firmware loaded on the unit you receive.
Same-Series Comparison: ACS550 Around 2.2 kW
| Model | Power | Current | Voltage class |
|---|---|---|---|
| ACS550-01-04A1-4 | 1.5 kW / 2 HP | 4.1 A | 380-480 V |
| ACS550-01-05A4-4 | 2.2 kW / 3 HP | 5.4 A | 380-480 V |
| ACS550-01-06A9-4 | 3.0 kW / 4 HP | 6.9 A | 380-480 V |
| ACS550-01-08A8-4 | 4.0 kW / 5 HP | 8.8 A | 380-480 V |
| ACS550-U1-05A4-4 | 2.2 kW / 3 HP | 5.4 A | 380-480 V (US catalog code) |
The most common confusion is between the ACS550-01-05A4-4 and the ACS550-U1-05A4-4. Electrically they are the same drive at the same rating; the difference is the catalog suffix used between regions. The U1 part number is more common in North America, the 01 part number is the global type code. If the existing drive label shows U1 and the only available stock is 01, it is generally a like-for-like replacement at the same firmware family.
Compatible Components and Common Pairings
An ACS550-01-05A4-4 is rarely the only spare needed; the typical kit includes:
- Control panel: ACS-CP-C basic, ACS-CP-A assistant, or ACS-CP-D copy panel for parameter cloning
- Fieldbus adapters: RPBA-01 Profibus, RDNA-01 DeviceNet, FENA-11 EtherNet/IP / Profinet
- Input chokes / EMC filters: line reactors and external RFI filters for harmonic control
- Brake resistors: external resistors for high-inertia decelerations
- Cables: shielded VFD cable, sized for 5.4 A continuous and the cable run length
Common Use Cases
- HVAC fan and pump control in commercial buildings
- Booster pumps, cooling tower fans, and water-treatment blowers in municipal plants
- Conveyor and mixer drives for food, packaging, and material-handling machines
- Like-for-like replacement of a failed ACS550 in an existing panel without redoing the wiring
Why Buy the ACS550-01-05A4-4 from Rabwellplc
Rabwellplc stocks the ACS550-01-05A4-4 as a US-shipping spare, with date-code traceability and matching control panels available in the same order. The catalog also covers the rest of the ABB drives and motion control range, including ACS580 successors, so a single quote can cover both the like-for-like replacement and the upgrade path. For OEM rebuilds, parts that wire up around the drive — Schneider PLC controllers, ABB chokes, and accessories — are available in the same catalog.
Need an ACS550-01-05A4-4 with a known firmware? Check live stock on the ACS550-01-05A4-4 product page and tell us whether you also need a control panel or fieldbus module.
Frequently Asked Questions
What does the type code "ACS550-01-05A4-4" mean?
ACS550 is the drive family, 01 is the wall-mounted version, 05A4 is 5.4 A continuous output, and the trailing 4 is the 380-480 V voltage class. Together it identifies a 2.2 kW / 3 HP standard drive for 480 V systems.
Is the ACS550-01-05A4-4 the same as the ACS550-U1-05A4-4?
Electrically the same drive at the same rating. The U1 catalog code is the North American variant, the 01 is the global type code. For most replacements they are interchangeable; verify the firmware family if the existing parameter set will be loaded into the new unit.
Does the ACS550-01-05A4-4 have a built-in EMC filter?
Yes, the standard 380-480 V ACS550 includes an internal EMC filter rated for second environment (industrial). For first-environment installations, an external filter or specific catalog suffix is required.
What is the ACS580 replacement for the ACS550-01-05A4-4?
ABB positions the ACS580 series as the modern equivalent. The closest ACS580 part at 2.2 kW / 380-480 V is in the same frame range as the ACS550 R1; consult the ABB selection tool to confirm the exact ACS580 type code that matches your overload, IP rating, and fieldbus needs.
Can the ACS550-01-05A4-4 run sensorless vector?
Yes. The ACS550 supports both scalar (V/Hz) and sensorless vector control, selectable in the parameter group. For applications needing precise speed control without an encoder, sensorless vector is the right mode.