3-Phase 208 D - 480 Y 277 (Step-Up Drive Isolation Transformer)
Size
Estimated Delivery Date: (call to expedite)
Transformer is in stock! Delivers in 3 - 5 business days
WHY BUY USED?
Same Warranty. Better Price.
Used transformers carry the same warranty as new ones with pictures and test results available on request. Give us a call and we’ll check our inventory.
Overview
Maddox Drive-Isolation Transformers are designed to meet the rugged demands of both AC and DC variable speed drives and provide the required voltage change.
The separate windings provide electrical isolation between the incoming power and the SCR or VFD load. The windings are designed to withstand overcurrent at 150% of the rated load for 60 seconds or 200% of the rated load for 30 seconds, as well as minor harmonic noise at or below K-Factor 4. Standard duty cycle is one start every two hours.
Drive Isolation Transformers are sized to match standard motor horsepower and voltage ratings.
Learn when you should use a drive isolation transformer.
Standard sizes range from 5 to 600 HP in six standard voltages.
Primary Voltage: 208 D
Secondary Voltage: 480 Y 277
Transformer Specifications:
- 60 Hz Frequency
- 150°C Temperature Rise
- 220°C Insulation Class
- Primary Adjustment Taps 1 above, 1 below in 5% increments
- High Efficiency Aluminum Windings
- DOE Exempt
Transformer may appear different than pictured.
Wall brackets are not included with every model. Contact us if these are required.
Size Guide
| kVA | Amps at 208v | Amps at 480v | Startup (low) | Startup (high) |
| 11 | 31 | 13 | 53 | 79 |
| 14 | 39 | 17 | 67 | 101 |
| 20 | 56 | 24 | 96 | 144 |
| 27 | 75 | 32 | 130 | 195 |
| 34 | 94 | 41 | 164 | 245 |
| 40 | 111 | 48 | 192 | 289 |
| 51 | 142 | 61 | 245 | 368 |
| 63 | 175 | 76 | 303 | 455 |
| 75 | 208 | 90 | 361 | 541 |
kVA Sizing Recommendation: At least 20% above the rated horsepower on the motor.
Dimensions & Weights
| kVA | Dimensions (HxWxD) | Weight (lbs) |
| 11 | 21.5"x19.38"x20.2" | 150 |
| 14 | 21.5"x19.38"x20.2" | 180 |
| 20 | 28.75"x23.9"x25" | 225 |
| 27 | 28.75"x23.9"x25" | 280 |
| 34 | 28.75"x23.9"x25" | 305 |
| 40 | 28.75"x23.9"x25" | 315 |
| 51 | 28.75"x23.9"x25" | 370 |
| 63 | 38"x26"x21" | 510 |
| 75 | 38"x26"x21" | 570 |
Approximate Enclosure Dimensions & Weights
Shipping rates vary, but are generally 10% of the total purchase price.
Transformers deliver in 3-5 business days.
Read more here: Shipping Policy
Ordered the wrong unit, or not sure if a product is right for you? Our web store exchange policy has you covered! We’ll send you a replacement transformer, all you pay for is shipping, plus the difference in unit price. Our policy lasts 30 days. If 30 days have gone by since your purchase, we cannot offer you a refund or exchange, but we still may be interested in buying the unit back. Proof of purchase is required to process a return or exchange.
Read more here: Return and Refund Policy
Buy with confidence. All new and used Maddox transformers are tested and come with a full 5 year warranty against defects. If you experience any problems just give us a call and receive a replacement, free of charge. We'll even pay the shipping!
Read more here: Warranty, Terms and Conditions
Customer Reviews
