Comprehensive technical data for 150 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 150 kVA | Phase: | Three-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 208Y/120V |
| Weight: | 800 lbs (363 kg) | Efficiency: | 98.9% |
| Dimensions (H×W×D): | 50″ × 28″ × 24″ (1270 × 711 × 610 mm) | ||
A 150 kVA transformer is commonly used in Heavy industrial loads. This guide provides complete specifications to help engineers and purchasers select and install 150 kVA transformers correctly.
150 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1270 mm | 50″ |
| Width (W) | 711 mm | 28″ |
| Depth (D) | 610 mm | 24″ |
150 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 800 lbs | 363 kg |
| Oil-Filled Equivalent* | ~1200 lbs | ~544 kg |
| Shipping Weight (Approx.) | ~880 lbs | ~399 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 150 kVA three-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 721.7 A | 750 MCM+ |
| 208V | 416.4 A | 750 MCM+ |
| 240V | 360.9 A | 500 MCM |
| 277V | 312.7 A | 500 MCM |
| 480V | 180.4 A | 4/0 AWG |
| 600V | 144.3 A | 2/0 AWG |
Three-Phase:
Amps = (kVA × 1000) ÷ (Voltage × 1.732)Example at 480V:
180.4 A = (150 × 1000) ÷ (480 × 1.732)Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 150 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 280 W | Core/iron losses (typical) |
| Load Loss | 1150 W | Copper losses at 100% load |
| Total Losses | 1430 W | At 100% load |
| Impedance | 5.0% | ±7.5% tolerance per IEEE |
| Efficiency | 98.9% | At 100% load |
| Sound Level | ~43 dB | Per NEMA ST-20 (estimated) |
- Large transformers like this 150 kVA unit generate significant heat. Verify room ventilation capacity before installation.
- Floor loading of 800 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 150 kVA Three-Phase Transformer the Right Choice?
A 150 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 150 kVA, you can support approximately 89 HP of combined motor load at 80% efficiency and 0.85 power factor.
Typical Load Examples for 150 kVA
Example load distribution for a 150 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Process motors | 52 kVA |
| HVAC chillers | 37 kVA |
| Lighting systems | 18 kVA |
| Welding equipment | 22 kVA |
| Support systems | 19 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 |
|---|---|
| 112.5 kVA Three-Phase | 112.5 kVA Specifications → |
| 150 kVA Three-Phase | Current Page |
| 225 kVA Three-Phase | 225 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 150 kVA transformer?
A typical 150 kVA dry three-phase transformer measures approximately 50″ H × 28″ W × 24″ D (1270 × 711 × 610 mm). Dimensions vary by manufacturer.
How much does a 150 kVA transformer weigh?
A 150 kVA dry transformer typically weighs around 800 lbs (363 kg). Oil-filled transformers of the same rating weigh approximately 1200 lbs.
What is the full load amperage of a 150 kVA transformer at 480V?
At 480V, a 150 kVA three-phase transformer has a full load current of 180.4 amps.
What loads can a 150 kVA transformer handle?
A 150 kVA transformer can supply up to 150 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 127.5 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