Comprehensive technical data for 75 kVA dry transformers including dimensions, weight, full load amps, installation tips, and sizing guidance
Quick Specifications
| Rated Power: | 75 kVA | Phase: | Single-Phase |
| Primary Voltage: | 480V | Secondary Voltage: | 120/240V |
| Weight: | 500 lbs (227 kg) | Efficiency: | 98.8% |
| Dimensions (H×W×D): | 46″ × 26″ × 20″ (1168 × 660 × 508 mm) | ||
A 75 kVA transformer is commonly used in Industrial plants, data centers. This guide provides complete specifications to help engineers and purchasers select and install 75 kVA transformers correctly.
75 kVA Transformer Dimensions
| Dimension | Metric (mm) | Imperial (inches) |
|---|---|---|
| Height (H) | 1168 mm | 46″ |
| Width (W) | 660 mm | 26″ |
| Depth (D) | 508 mm | 20″ |
75 kVA Transformer Weight
| Weight Type | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| Dry-Type Transformer | 500 lbs | 227 kg |
| Oil-Filled Equivalent* | ~750 lbs | ~340 kg |
| Shipping Weight (Approx.) | ~550 lbs | ~249 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 75 kVA single-phase transformer:
| Voltage | Full Load Amps | Suggested Wire Size |
|---|---|---|
| 120V | 625.0 A | 750 MCM+ |
| 208V | 360.6 A | 500 MCM |
| 240V | 312.5 A | 500 MCM |
| 277V | 270.8 A | 350 MCM |
| 480V | 156.2 A | 3/0 AWG |
| 600V | 125.0 A | 1/0 AWG |
Single-Phase:
Amps = (kVA × 1000) ÷ VoltageExample at 480V:
156.2 A = (75 × 1000) ÷ 480Electrical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Rated kVA | 75 kVA | At rated voltage and frequency |
| Frequency | 60 Hz | 50 Hz available on request |
| No-Load Loss | 150 W | Core/iron losses (typical) |
| Load Loss | 580 W | Copper losses at 100% load |
| Total Losses | 730 W | At 100% load |
| Impedance | 4.5% | ±7.5% tolerance per IEEE |
| Efficiency | 98.8% | At 100% load |
| Sound Level | ~41 dB | Per NEMA ST-20 (estimated) |
⚠️ Important Considerations for 75 kVA Transformers:
- At 75 kVA, ensure adequate ventilation clearance (minimum 3″ sides, 6″ top) for proper cooling.
- Impedance matching is critical when paralleling transformers. Consult a power systems engineer.
When is a 75 kVA Transformer the Right Choice?
A 75 kVA single-phase transformer is designed for substantial loads:
- Large commercial facilities (10,000+ sq ft)
- Industrial workshops with heavy machinery
- Data center backup power systems
- Large agricultural operations
- Mining and extraction equipment
Engineering Considerations:
- Voltage drop calculations become critical at this size
- Short circuit current analysis required
- Consider redundant transformer configuration for critical loads
- Coordinate overcurrent protection with utility requirements
Typical Load Examples for 75 kVA
Example load distribution for a 75 kVA installation:
| Load Type | Estimated Demand |
|---|---|
| Industrial HVAC | 18 kVA |
| Production equipment | 26 kVA |
| Facility lighting | 11 kVA |
| Compressed air system | 11 kVA |
| Office/admin loads | 7 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 |
|---|---|
| 50 kVA Single-Phase | 50 kVA Specifications → |
| 75 kVA Single-Phase | Current Page |
| 100 kVA Single-Phase | 100 kVA Specifications → |
Frequently Asked Questions
What are the dimensions of a 75 kVA transformer?
A typical 75 kVA dry single-phase transformer measures approximately 46″ H × 26″ W × 20″ D (1168 × 660 × 508 mm). Dimensions vary by manufacturer.
How much does a 75 kVA transformer weigh?
A 75 kVA dry transformer typically weighs around 500 lbs (227 kg). Oil-filled transformers of the same rating weigh approximately 750 lbs.
What is the full load amperage of a 75 kVA transformer at 480V?
At 480V, a 75 kVA single-phase transformer has a full load current of 156.2 amps.
What loads can a 75 kVA transformer handle?
A 75 kVA transformer can supply up to 75 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 63.8 kW of real power.
Related Resources
📊 Complete Reference Charts:
- 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