Comprehensive technical data for 225 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 225 kVA | Phase: | Three-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 208Y/120V |
| Weight: | 1050 lbs (476 kg) | Efficiency: | 99.0% |
| Dimensions (H×W×D): | 55″ × 30″ × 26″ (1397 × 762 × 660 mm) | ||
A 225 kVA transformer is commonly used in Large industrial plants. This guide provides complete specifications to help engineers and purchasers select and install 225 kVA transformers correctly.
225 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1397 mm | 55″ |
| Width (W) | 762 mm | 30″ |
| Depth (D) | 660 mm | 26″ |
225 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 1050 lbs | 476 kg |
| Oil-Filled Equivalent* | ~1575 lbs | ~714 kg |
| Shipping Weight (Approx.) | ~1155 lbs | ~523 kg |
*Oil-filled transformer weight is estimated at approximately 1.5× dry-type weight.
Full Load Amps at Various Voltages
The following table shows calculated full load amperage for a 225 kVA three-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 1082.6 A | 750 MCM+ |
| 208V | 624.6 A | 750 MCM+ |
| 240V | 541.3 A | 750 MCM+ |
| 277V | 469.0 A | 750 MCM+ |
| 480V | 270.6 A | 350 MCM |
| 600V | 216.5 A | 250 MCM |
Three-Phase:
Amps = (kVA × 1000) ÷ (Voltage × 1.732)Example at 480V:
270.6 A = (225 × 1000) ÷ (480 × 1.732)Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 225 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 360 W | Core/iron losses (typical) |
| Load Loss | 1550 W | Copper losses at 100% load |
| Total Losses | 1910 W | At 100% load |
| Impedance | 5.0% | ±7.5% tolerance per IEEE |
| Efficiency | 99.0% | At 100% load |
| Sound Level | ~44 dB | Per NEMA ST-20 (estimated) |
- Large transformers like this 225 kVA unit generate significant heat. Verify room ventilation capacity before installation.
- Floor loading of 1050 lbs requires structural verification. Contact a structural engineer for slab-on-grade installations.
- Impedance matching is critical when paralleling transformers. Consult a power systems engineer.
When is a 225 kVA Three-Phase Transformer the Right Choice?
A 225 kVA three-phase transformer is designed for:
- Medium industrial facilities and machine shops
- Multi-story commercial buildings
- Large HVAC central plant systems
- Printing and packaging operations
- Food processing facilities
Capacity Planning:
At 225 kVA, you can support approximately 134 HP of combined motor load at 80% efficiency and 0.85 power factor.
Typical Load Examples for 225 kVA
Example load distribution for a 225 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Process motors | 78 kVA |
| HVAC chillers | 56 kVA |
| Lighting systems | 27 kVA |
| Welding equipment | 33 kVA |
| Support systems | 29 kVA |
Note: Actual loads vary. Always perform a detailed load calculation for your specific application.
Related Transformer Sizes
Compare with adjacent kVA ratings:
| kVA Rating | Link |
|---|---|
| 150 kVA Three-Phase | 150 kVA Specifications → |
| 225 kVA Three-Phase | Current Page |
| 300 kVA Three-Phase | 300 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 225 kVA transformer?
A typical 225 kVA dry three-phase transformer measures approximately 55″ H × 30″ W × 26″ D (1397 × 762 × 660 mm). Dimensions vary by manufacturer.
How much does a 225 kVA transformer weigh?
A 225 kVA dry transformer typically weighs around 1050 lbs (476 kg). Oil-filled transformers of the same rating weigh approximately 1575 lbs.
What is the full load amperage of a 225 kVA transformer at 480V?
At 480V, a 225 kVA three-phase transformer has a full load current of 270.6 amps.
What loads can a 225 kVA transformer handle?
A 225 kVA transformer can supply up to 225 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 191.2 kW of real power.
Related Resources
- Transformer Sizing Chart – Compare all kVA ratings with dimensions & weights
- Transformer Full Load Amps Chart – FLA reference for all voltages
Related Articles
- Three Phase Transformer: Complete Guide
- Transformer Testing: Complete Guide
- Transformer Protection: Complete Guide
Standards & References
- IEEE C57.12.01 – General Requirements for Dry-Type Transformers
- IEEE C57.12.91 – Test Code for Dry-Type Transformers
- NEMA TP-1 – Guide for Determining Energy Efficiency
- DOE 10 CFR 431 – Energy Conservation Standards
Disclaimer: Specifications shown are typical reference values compiled from multiple industry sources. Actual specifications vary significantly by manufacturer, model, enclosure type, and configuration. Always consult manufacturer datasheets for exact specifications before ordering or installation. Data accuracy verified using standard electrical engineering formulas. Last updated: January 2026