75kva transformer
The following is a summary of the core information about a **75 kVA transformer**, covering **prices, types, key points for model
selection**, and **local suggestions in the United States**, which will help you make quick decisions:
I. Core Price Range (US Market)
| Type | New or Used Status | Price Range | Typical Brands | Common Voltage Configurations |
| Three-phase Transformer | Second-hand and Refurbished | $1,200~$2,500 | Cutler-Hammer, Square D | 480V→208Y/120V (Mainstream) |
| Brand-new | $2,500~$4,000 | Eaton, Hammond | 480V→240V (Outdoor Oil-cooled) | |
| Single-phase Transformer | Brand-new | $4,000~$6,000 | Square D (Customized Model) | 240V→120V (High Current) |
II. Quick Model Selection Guide
1. Selection by Purpose
- **Commercial/Industrial Power Distribution (Three-phase)**
- **Indoor Dry Type**: Choose **Square D or Eaton** ($2,500~$4,000), with a NEMA 1 casing.
- **Outdoor Oil-cooled Type**: Choose **Hammond NEMA 3R** ($2,300~$2,800), which is weatherproof.
- **Large Single-phase Loads (such as Welding Machines, Charging Piles)**
- It is necessary to customize **Square D or local electrical brands**, and pay attention to the current calculation:
**Single-phase current of 75 kVA = 75,000VA ÷ 240V = 312.5A** (The specification of the circuit breaker needs to be matched).
2. Selection by Budget
- **With a Limited Budget**: **Second-hand and Refurbished** (eBay, Breaker Outlet), and give priority to models with a
**1~2-year warranty** (such as Federal Pacific T4T75-1, $1,100~$1,500).
- **Pursuing Reliability**: **Brand-new Equipment** (Brand official websites or Alibaba US site), and pay attention to **UL
certification** and **1-year original factory warranty**.
III. Key Parameter Verification
1. **Voltage Levels**
- Commonly used **input voltages** in the United States: 480V (Three-phase), 240V (Single-phase);
- **Output voltages**: 208Y/120V (Three-phase Commercial), 240V/120V (Single-phase Residential).
2. **Cooling Methods**
- **Dry Type**: Oil-free, suitable for indoor use (such as shopping malls, office buildings);
- **Oil-cooled Type**: Good heat dissipation, suitable for outdoor use (such as power distribution in factories and streets).
3. **Installation Environment**
- NEMA 1 (Indoor Dust-proof), NEMA 3R (Outdoor Rain-proof).
IV. Local Suggestions in Los Angeles County
1. **Supplier Recommendations**
- **Wankong Electrical** (Local in Los Angeles): Provides second-hand and refurbished as well as brand-new transformers,
and supports voltage customization.
- **Grainger** (Industrial Supplier): Sufficient stock available, and offline pick-up is possible (Address: Industrial Avenue,
Los Angeles).
2. **Installation Notes**
- Installation requires a **California Electrical License** and should comply with **NEC specifications** (such as grounding,
conductor specifications).
- For outdoor installation, it is necessary to apply for an electrical permit from the **Los Angeles County Government**
(The cost is approximately $150~$300).
V. Common Questions
- **Q: How many devices can a 75 kVA three-phase transformer power?**
A: It depends on the type of load. For pure resistive loads (such as heaters), it is approximately **75 kW**, and for motor-type
loads (inductive), it is recommended to derate to below **60 kW**.
- **Q: Why is a single-phase transformer more expensive than a three-phase one?**
A: The demand for single-phase transformers is low, the customization level is high, and the cost of high-current design is higher.
**Next Steps**:
1. Confirm the voltage requirements and contact local suppliers to get quotations;
2. If installation is required, contact Wankong Electrical.
