ABB ACH550-UH-012A-4

The ABB ACH550-UH-012A-4 is a 7.5 HP variable frequency drive purpose-built for HVAC applications, delivering 11.9 amps of continuous output on 380–480V three-phase power. Housed in a wall-mount UL Type 1 enclosure (R1 frame), this ACH550 series drive is a proven workhorse for supply and return fans, air handling units, cooling tower fans, and centrifugal pumps in commercial buildings.

Building automation integration comes standard: the ACH550-UH-012A-4 includes embedded BACnet, Modbus RTU, Johnson Controls N2, and Siemens FLN protocols with no add-on communication cards required. Two internal PID loops, a real-time clock with timer functions, and preloaded HVAC application macros make commissioning fast, while the Hand-Off-Auto keypad gives operators familiar, intuitive control. ABB's patented swinging choke reduces harmonic distortion without external line reactors.

ABB has discontinued the ACH550 series in favor of the ACH580, but thousands of ACH550-UH-012A-4 drives remain in service. We keep this model in stock — fully tested and warrantied — so you can replace a failed unit without reprogramming your BAS or rewiring for a new drive family. Board-level repair and exchange options are also available, and if you're ready to modernize, we can cross-reference the direct ACH580 replacement.

Key Specifications:

• Manufacturer: ABB
• Series: ACH550 (HVAC drive)
• Horsepower: 7.5 HP (normal duty)
• Output current: 11.9 A continuous
• Input: 380–480 V AC, 3-phase
• Enclosure: UL Type 1 (IP21), frame size R1
• Communications: BACnet, Modbus RTU, Johnson Controls N2, Siemens FLN (embedded)
• Lifecycle status: Discontinued by ABB — superseded by ACH580 series