75 kva transformer dimensions

The dimensions of a 75 kVA transformer vary depending on the **type, voltage level, protection class, and manufacturer**. 

The following are common dimension references:

I. Typical Dimension Parameters

1. Dry-Type Distribution Transformer (Three-Phase, 600V to 208Y/120V)

- **Square D (Model SD75-T3-2N)**

  - **Dimensions**: 34×30×32 inches (approximately 864×762×813 mm)

  - **Weight**: Approximately 1200 pounds (544 kg)

  - **Distance between Mounting Holes**: 28×24 inches (711×610 mm)

- **Eaton (Model 5SC3U75E)**

  - **Dimensions**: 32.5×28×30 inches (826×711×762 mm)

  - **Weight**: 1100 pounds (499 kg)

2. Oil-Cooled Transformer (480V to 240V, NEMA 3R Protection)

- **GE (Model T75H3FS)**

  - **Dimensions**: 42×36×48 inches (1067×914×1219 mm)

  - **Weight**: 1500 pounds (680 kg)

  - **Features**: Equipped with radiators and an oil level indicator

3. Isolation Transformer (Single-Phase, 480V to 120V, IP24 Protection)

- **Trafotek (Model T75-1PH-480/120)**

  - **Open Type**: 28×22×24 inches (711×559×610 mm)

  - **Protective Type**: 34×28×30 inches (864×711×762 mm)

  - **Weight**: 450 pounds (204 kg)

4. Compact Transformer (with Integrated Circuit Breaker)

- **ABB (Model TR24-75KVA)**

  - **Dimensions**: 36×30×36 inches (914×762×914 mm)

  - **Weight**: 680 pounds (308 kg)

  - **Application**: Commercial buildings or data centers

II. Factors Affecting Dimensions

1. **Cooling Method**:

   - **Dry Type**: Smaller in size (approximately 0.5 to 0.8 m³), and ventilation space needs to be reserved.

   - **Oil-Cooled Type**: Larger in size (approximately 1 to 1.5 m³), and protection against oil leakage needs to be considered.

2. **Protection Class**:

   - NEMA 1 (Indoor Open Type) < NEMA 3R (Outdoor Waterproof) < NEMA 4X (Anti-Corrosion).

3. **Winding Material**:

   - Transformers with copper windings are 10% to 15% smaller in volume than those with aluminum windings, but they are heavier.

III. Selection Suggestions

- **Industrial Scenarios**: Give priority to choosing **oil-cooled type + NEMA 3R**, with a height of approximately 1.2m, 

and a maintenance passage needs to be reserved.

- **Indoor Installation**: **Dry-type transformers** are more compact (for example, the Eaton model can be embedded in 

the wall), and it is recommended to leave a heat dissipation gap of 300mm around it.

- **Temporary Power Supply**: The dimensions of rental-type transformers (such as the Generac 75 kVA) are approximately 

**48×48×60 inches** (1.2×1.2×1.5 m), and the width of the transportation entrance needs to be confirmed.

**Note**: The specific dimensions should be subject to the **manufacturer's model manual**. It is recommended to provide

 the following parameters when consulting the supplier:

- Input/Output Voltage

- Number of Phases (Single-Phase/Three-Phase)

- Protection Class (IP/NEMA)

- Additional Functions (Circuit Breaker, Wheels, etc.)