Specifications:
The Marcus 75kVA 3-Phase Autotransformer (Serial Number 983-393) is a commercial/industrial dry-type electrical transformer engineered to step up or step down specific line voltages without galvanic isolation.
Because autotransformers utilize shared windings, this unit provides a lighter footprint, lower sound levels, and higher efficiency compared to standard isolation models.
Standard Manufacturer Specifications
While your exact serial number specifies the production run, Marcus three-phase autotransformers in this power class generally adhere to the following build standards:
- Capacity: 75 kVA
- Phase: 3-Phase
- Frequency: 60 Hz
- Insulation Class: Class 220 (R)
- Temperature Rise: 150°C
- Enclosure: Typically NEMA 1 (Indoor ventilated) or NEMA 3R (Weatherproof outdoor)
- Average Weight: ~250 lbs (113 kg), making them significantly lighter than their isolation counterparts
