75 kva transformer dimensions
The following is a summary of the **dimensions and weight** of a **75 kVA transformer**, covering **type differences**, **installation precautions**, and **local references in the United States**:
I. Core Dimensions and Weight (Mainstream Models in the US Market)
| Type | Cooling Method | Typical Dimensions (Width × Depth × Height, in inches) | Weight (in pounds) | Application Scenarios |
| Three-phase Dry Type | Air Cooling | 30×20×37 (Square D EE75T3H) | 544 | Indoor Commercial Power Distribution (NEMA 1/2) |
| Air Cooling | 24×21×26 (Hammond Three-phase) 24×21×26 | 465 | Installation in Compact Spaces | |
| Three-phase Oil-cooled Type | Oil Cooling | 49×37×46 (Cat Rental Model) | 700 | Outdoor Industrial Scenarios (NEMA 3R) |
| Single-phase Dry Type | Air Cooling | 31×20×28 (General-purpose Type) | Approximately 500 | High-current Loads (such as Charging Piles) |
II. Core Factors of Dimension Differences
1. **Cooling Method**
- **Dry-type Transformer**: Oil-free, with a smaller volume (for example, the indoor type of Square D is **30×20×37 inches**), suitable for limited indoor spaces.
- **Oil-cooled Transformer**: Requires an oil tank and a heat dissipation structure, with larger dimensions (for example, the outdoor type of Cat is **49×37×46 inches**), and the weight increases by approximately 30%.
2. **Number of Phases and Design**
- **Three-phase Transformer**: More compact in structure (with integrated three-phase windings), and its volume is smaller than that of a single-phase transformer under the same capacity.
- **Single-phase Transformer**: Designed for high current (for example, a thick wire is required for 240V→120V), and its volume is close to that of a three-phase transformer, and the weight is also similar.
3. **Protection Level**
- NEMA 1 (Indoor Dust-proof): The dimensions are close to those of the bare machine.
- NEMA 3R (Outdoor Rain-proof): The thickness of the casing is increased, and the dimensions may increase by **10%~15%**.
III. Installation and Transportation Precautions
1. **On-site Space Requirements**
- For indoor installation, an **additional 12~18 inches** of heat dissipation space should be reserved (especially at the top of the dry-type transformer).
- The width of the door should be ≥ **40 inches** (for example, the transportation dimensions of Square D are **48×40×45 inches**, including the pallet).
2. **Weight and Load-bearing Capacity**
- The weight of a dry-type transformer is **450~550 pounds**, and a forklift or lifting equipment is required for handling.
- An outdoor oil-cooled transformer weighs **≥700 pounds** and requires a concrete foundation (with a load-bearing capacity of ≥1,000 pounds per square foot).
IV. Local References in the United States
1. **Examples of Supplier Models**
- **Square D EE75T3H** (Second-hand and Refurbished):
- The actual dimensions are **30×20×37 inches**, the weight is 544 pounds, and it supports 480V→208Y/120V.
- **Hammond Three-phase Transformer** (Brand-new):
- The dimensions are **24×21×26 inches**, the weight is 465 pounds, and it is suitable for scenarios with limited space.
2. **Installation Suggestions**
- Contact **Wankong Electrical** or **Grainger** to obtain customized dimension drawings (including the positions of anchor bolt holes).
- For outdoor installation, it is necessary to confirm the **local electrical codes** in advance (for example, the state of Washington requires that the NEMA 3R casing should be at least 18 inches above the ground).
V. Common Questions
- **Q: Do the dimensions include the terminal blocks?**
A: No, the terminal blocks usually protrude **2~4 inches** from the casing, and additional space should be reserved.
- **Q: Can the dimensions be customized?**
A: Some brands (such as Hammond) support customization, but the price may increase by **15%~20%**.
**Next Steps**:
1. Measure the dimensions of the installation location and contact local suppliers to confirm the model matching;
2. If transportation is required, confirm the load-bearing capacity and space limitations of the logistics provider in advance.
