Variable Frequency Drives & Digital Phase Converters


Three-Phase Active Front End Variable Frequency Drives

DX4xxxR 400 - 450 HP

Three-phase to three-phase Variable Frequency Drive (VFD), includes input reactor, best in-class cooling, and integrated in a field serviceable 3R enclosure.

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DX Signature Series VFD’s are designed with film bus technology to ensure little to no downtime when commissioning the system at the beginning of each season. By utilizing the latest advances in power electronics and capacitor technology, Phase Technologies VFD’s are the best choice for motor control applications.

An input reactor is a standard feature on all DX Series VFD’s. The input reactor is an inductor connected in series between the input terminals and the diode or IGBT rectifier. The input reactor reduces harmonics on the input lines, protects the input stage from current surges, and reduces ripple on the DC bus. It does offer some protection against voltage transients, but the installation of a surge protective device (SPD) is recommended to protect the system from surges.

The drive and enclosure are thermally engineered as one unit, directing airflow over critical heat-producing components while isolating sensitive components from outside ambient air. Most outdoor 3R rated drives integrate a NEMA 1 indoor VFD in an outdoor enclosure without segregating the airflow. The drive and other sensitive components can be degraded due to re-circulated hot air and contaminants from the outside air.

Industries served: Wells Pumps, Irrigation Pumps, Motor Control

Standard Features
  • NEMA 3R Enclosure w/Insect Guards
  • Easy Perfect Pressure™ Setup
  • 2-Year Warranty
  • 122° F (50° C) Rated
  • Easy Field Serviceability


Optional Add-Ons
  • MCCB & Service Rated Disconnect
  • Dv/dt Output Filter (Integrated)
  • Sine Wave output Filter (Integrated)
  • HOA & Speed Potentiometer
  • Strikesorb Surge Protection
  • 0 - 150 psi Transducer
  • Pad Mount Kit
  • Torque Control


Models: DX4400R DX4450R
General Power Specs    
Rated HP 400 HP 450 HP
Rated Input Current 478A 515A
Input Voltage 460/480V, three-phase
Rated Output Current 478A 515A
Output Voltage 460/480V, three-phase
Other Specs    
Recommended Breaker Size N/A N/A
Enclosure size (H x W x D) 64 x 83 x 28" 64 x 83 x 28"
Shipping Weight 998 lbs 1096 lbs
Shipping Type Freight Freight