Hammond DM550KD Drive Isolation Transformer HT1793

In stock
Shipping: $200.00 via Ground
550 kVA 480 Delta Volts Primary x 240 Y Volts Secondary, 3 Phase, 60 Hz, Aluminum, NEMA 3R
Specifications View more Close tab
More Information
Transformer Type Drive Isolation
Input Voltage 480
Output Voltage 240 Y
Phase Three
Frequency (Hz) 60
kVA 550
K Rating 1
Primary Configuration Delta
Secondary Configuration Wye
Winding Material Aluminum
Temperature Rise (°C) 150
Insulation System (°C) 220
Enclosure Rating NEMA 3R
Enclosure Material Steel
Construction Style Enclosed - Ventilated Core & Coil
Mounting Type Floor
Connection Type Lugs / Bolt-down terminals
Cooling Air/Dry
Length (in) 38.4
Width (in) 48.5
Height (in) 59
Weight (lb) 2350
Warranty 10 Years
Support Information View more Close tab
Dimensional Diagram
(Size: 123.1 KB)
(Size: 342.8 KB)
Wiring Diagram
(Size: 196.3 KB)
Related Information View more Close tab
Product Description View more Close tab

With today's technological advances in solid-state power control devices, the use of AC and DC variable speed drives has proliferated in many industrial markets. General purpose distribution transformers are not adequate for this type of application.

Designed to meet the rugged demands of both AC and DC variable speed drives and also to provide the required voltage change. The separate primary and secondary windings provide electrical isolation between the incoming line and the SCR load. The windings are designed to withstand overcurrent of 150% of the rated load for 60 seconds or 200% of the rated load for 30 seconds. (A duty cycle of one start for every two hours is permitted.)

Drive isolation transformers are sized to match standard motor horsepower and voltage ratings. Standard sizes range from 5 to 600 HP in six standard voltages. Non-standard sizes and voltages are available upon request.


  • UL Listed and CSA Certified
  • Ventilated, NEMA 3R Rated - Rugged design lets you install it where you need it whether that be indoors or outdoors.
  • Optional: NEMA 4, 4X (Stainless Steel) and 12 available
  • 3-6% Impedance
  • Thermostat Provided as Standard
Product Videos View more Close tab
What Is a Transformer And How Does It Work?

What is a Transformer and How Does It Work?

Transformers change voltage through electromagnetic induction between the primary and secondary winding coils. This video illustrates the basics of how transformers work.

Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account